WO2010088294A1 - Conjugate based systems for controlled drug delivery - Google Patents
Conjugate based systems for controlled drug delivery Download PDFInfo
- Publication number
- WO2010088294A1 WO2010088294A1 PCT/US2010/022268 US2010022268W WO2010088294A1 WO 2010088294 A1 WO2010088294 A1 WO 2010088294A1 US 2010022268 W US2010022268 W US 2010022268W WO 2010088294 A1 WO2010088294 A1 WO 2010088294A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conjugate
- insulin
- occurrence
- formulation
- group
- Prior art date
Links
- 238000012377 drug delivery Methods 0.000 title description 5
- 239000000599 controlled substance Substances 0.000 title description 3
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- 241000124008 Mammalia Species 0.000 claims abstract description 25
- 238000013268 sustained release Methods 0.000 claims abstract 4
- 239000012730 sustained-release form Substances 0.000 claims abstract 4
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- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
- A61K47/61—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule the organic macromolecular compound being a polysaccharide or a derivative thereof
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- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
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- A61K31/33—Heterocyclic compounds
- A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
- A61K31/35—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin having six-membered rings with one oxygen as the only ring hetero atom
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- A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- A61K38/22—Hormones
- A61K38/28—Insulins
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- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/54—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic compound
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- A61P5/48—Drugs for disorders of the endocrine system of the pancreatic hormones
- A61P5/50—Drugs for disorders of the endocrine system of the pancreatic hormones for increasing or potentiating the activity of insulin
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- A61P7/12—Antidiuretics, e.g. drugs for diabetes insipidus
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K17/00—Carrier-bound or immobilised peptides; Preparation thereof
- C07K17/02—Peptides being immobilised on, or in, an organic carrier
- C07K17/10—Peptides being immobilised on, or in, an organic carrier the carrier being a carbohydrate
Definitions
- Each of these systems relies on the combination of a multivalent glucose binding molecule (e.g., the lectin Con A) and a sugar based component that is reversibly bound by the multivalent glucose binding molecule.
- Con A and many of the other readily available lectins have the potential to stimulate lymphocyte proliferation. By binding to carbohydrate receptors on the surfaces of certain types of lymphocytes, these so-called “mitogenic" lectins can potentially induce the mitosis of lymphocytes and thereby cause them to proliferate.
- Most mitogenic lectins including Con A are selective T-cell mitogens. A few lectins are less selective and stimulate both T-cells and B-cells.
- mitogenic lectins can result in inflammation, cytotoxicity, macrophage digestion, and allergic reactions including anaphylaxis.
- plant lectins are known to be particularly immunogenic, giving rise to the production of high titers of anti-lectin specific antibodies. It will be appreciated that mitogenic lectins cannot therefore be used in their native form for in vivo methods and devices unless great care is taken to prevent their release.
- U.S. Patent No. 5,830,506 Taylor highlights the toxic risks that are involved in using Con A and emphasizes the importance and difficulty of containing Con A within a drug delivery device that also requires glucose and insulin molecules to diffuse freely in and out of the device.
- the disclosure provides methods for controlling the pharmacokinetic (PK) and/or pharmacodynamic (PD) profiles of a drug such as insulin in a manner that is responsive to the systemic concentrations of a saccharide such as glucose.
- PK pharmacokinetic
- PD pharmacodynamic
- the methods are based in part on the discovery that when certain insulin-conjugates were modified to include high affinity saccharide ligands they could be made to exhibit PK/PD profiles that responded to saccharide concentration changes even in the absence of an exogenous multivalent saccharide-binding molecule such as Con A. This finding was unexpected and provides an unprecedented opportunity to generate simple lectin-free saccharide-responsive drug systems.
- the disclosure provides exemplary conjugates and methods for making these.
- these conjugates include a drug and one or more separate ligands that each includes a saccharide.
- the ligands are capable of competing with a saccharide (e.g., glucose or mannose) for binding to an endogenous saccharide-binding molecule.
- the ligands are capable of competing with glucose or mannose for binding to Con A.
- the ligands and drug may be covalently or non-covalently attached to a conjugate framework.
- the framework is non-polymeric.
- a conjugate may have a polydispersity index of one and a MW of less than about 20,000 Da.
- the conjugate is long acting (i.e., exhibits a PK profile that is more sustained than soluble recombinant human insulin or RHI).
- the methods, conjugates and formulations that are described herein are in no way limited to the delivery of insulin and that they can be used to deliver any drug. It is also to be understood that the methods may be used to deliver drugs in response to saccharides other than glucose.
- exemplary conjugates have been shown to respond to exogenous saccharides such as alpha-methyl mannose and L-fucose. In certain embodiments, this can be used to prepare conjugates that can be controlled by administration of one of these exogenous saccharides (i.e., instead of or in addition to being controlled by fluctuations in endogenous glucose).
- acyl groups include aldehydes (-CHO), carboxylic acids (-CO 2 H), ketones, acyl halides, esters, amides, imines, carbonates, carbamates, and ureas.
- Acyl substituents include, but are not limited to, any of the substituents described herein, that result in the formation of a stable moiety (e.g., aliphatic, alkyl, alkenyl, alkynyl, heteroaliphatic, heterocyclic, aryl, heteroaryl, acyl, oxo, imino, thiooxo, cyano, isocyano, amino, azido, nitro, hydroxyl, thiol, halo, aliphaticamino, heteroaliphaticamino, alkylamino, heteroalkylamino, arylamino, heteroarylamino, alkylaryl, arylalkyl, aliphaticoxy, heteroaliphaticoxy, alkyl
- Aliphatic - As used herein, the term "aliphatic” or “aliphatic group” denotes an optionally substituted hydrocarbon moiety that may be straight-chain (i.e., unbranched), branched, or cyclic ("carbocyclic") and may be completely saturated or may contain one or more units of unsaturation, but which is not aromatic. Unless otherwise specified, aliphatic groups contain 1-12 carbon atoms. In some embodiments, aliphatic groups contain 1-6 carbon atoms. In some embodiments, aliphatic groups contain 1-4 carbon atoms, and in yet other embodiments aliphatic groups contain 1-3 carbon atoms.
- Suitable aliphatic groups include, but are not limited to, linear or branched, alkyl, alkenyl, and alkynyl groups, and hybrids thereof such as (cycloalkyl)alkyl, (cycloalkenyl)alkyl or (cycloalkyl)alkenyl.
- alkenyl denotes an optionally substituted monovalent group derived from a straight- or branched-chain aliphatic moiety having at least one carbon-carbon double bond by the removal of a single hydrogen atom.
- the alkenyl group employed in the invention contains 2-6 carbon atoms.
- the alkenyl group employed in the invention contains 2-5 carbon atoms.
- the alkenyl group employed in the invention contains 2-4 carbon atoms.
- the alkenyl group employed contains 2-3 carbon atoms.
- Alkenyl groups include, for example, ethenyl, propenyl, butenyl, l-methyl-2-buten-l-yl, and the like.
- Alkyl - refers to optionally substituted saturated, straight- or branched-chain hydrocarbon radicals derived from an aliphatic moiety containing between 1-6 carbon atoms by removal of a single hydrogen atom.
- the alkyl group employed in the invention contains 1-5 carbon atoms.
- the alkyl group employed contains 1-4 carbon atoms.
- the alkyl group contains 1-3 carbon atoms.
- the alkyl group contains 1-2 carbons.
- alkyl radicals include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n- butyl, iso-butyl, sec-butyl, sec-pentyl, iso-pentyl, tert-butyl, n-pentyl, neopentyl, n-hexyl, sec- hexyl, n-heptyl, n-octyl, n-decyl, n-undecyl, dodecyl, and the like.
- alkynyl refers to an optionally substituted monovalent group derived from a straight- or branched-chain aliphatic moiety having at least one carbon-carbon triple bond by the removal of a single hydrogen atom.
- the alkynyl group employed in the invention contains 2-6 carbon atoms.
- the alkynyl group employed in the invention contains 2-5 carbon atoms.
- the alkynyl group employed in the invention contains 2-4 carbon atoms.
- the alkynyl group employed contains 2-3 carbon atoms.
- Representative alkynyl groups include, but are not limited to, ethynyl, 2-propynyl (propargyl), 1-propynyl, and the like.
- Aryl - refers to an optionally substituted monocyclic and bicyclic ring systems having a total of five to 10 ring members, wherein at least one ring in the system is aromatic and wherein each ring in the system contains three to seven ring members.
- the term “aryl” may be used interchangeably with the term “aryl ring”.
- “aryl” refers to an aromatic ring system which includes, but not limited to, phenyl, biphenyl, naphthyl, anthracyl and the like, which may bear one or more substituents.
- Arylalkyl - refers to an alkyl group substituted with an aryl group (e.g., an aromatic or heteroaromatic group).
- Bivalent hydrocarbon chain - is a polymethylene group, i.e., -(CH 2 )Z-, wherein z is a positive integer from 1 to 30, from 1 to 20, from 1 to 12, from 1 to 8, from 1 to 6, from 1 to 4, from 1 to 3, from 1 to 2, from 2 to 30, from 2 to 20, from 2 to 10, from 2 to 8, from 2 to 6, from 2 to 4, or from 2 to 3.
- a substituted bivalent hydrocarbon chain is a polymethylene group in which one or more methylene hydrogen atoms are replaced with a substituent. Suitable substituents include those described below for a substituted aliphatic group.
- Non- limiting examples of carbonyl groups include aldehydes, ketones, carboxylic acids, ester, amide, enones, acyl halides, anhydrides, ureas, carbamates, carbonates, thioesters, lactones, lactams, hydroxamates, isocyanates, and chloro formates.
- Cycloaliphatic As used herein, the terms “cycloaliphatic”, “carbocycle”, or “carbocyclic”, used alone or as part of a larger moiety, refer to an optionally substituted saturated or partially unsaturated cyclic aliphatic monocyclic or bicyclic ring systems, as described herein, having from 3 to 10 members.
- Cycloaliphatic groups include, without limitation, cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cyclohexenyl, cycloheptyl, cycloheptenyl, cyclooctyl, cyclooctenyl, and cyclooctadienyl.
- the cycloalkyl has 3-6 carbons.
- Halogen - As used herein, the terms “halo” and “halogen” refer to an atom selected from fluorine (fluoro, -F), chlorine (chloro, -Cl), bromine (bromo, -Br), and iodine (iodo, -I).
- heteroaliphatic or “heteroaliphatic group” denote an optionally substituted hydrocarbon moiety having, in addition to carbon atoms, from one to five heteroatoms, that may be straight-chain (i.e., unbranched), branched, or cyclic ("heterocyclic”) and may be completely saturated or may contain one or more units of unsaturation, but which is not aromatic.
- heteroaliphatic groups contain 1-6 carbon atoms wherein 1-3 carbon atoms are optionally and independently replaced with heteroatoms selected from oxygen, nitrogen and sulfur.
- heteroaliphatic groups contain 1-4 carbon atoms, wherein 1-2 carbon atoms are optionally and independently replaced with heteroatoms selected from oxygen, nitrogen and sulfur. In yet other embodiments, heteroaliphatic groups contain 1-3 carbon atoms, wherein 1 carbon atom is optionally and independently replaced with a heteroatom selected from oxygen, nitrogen and sulfur. Suitable heteroaliphatic groups include, but are not limited to, linear or branched, heteroalkyl, heteroalkenyl, and heteroalkynyl groups.
- heteroaryl refers to an alkyl group substituted by a heteroaryl, wherein the alkyl and heteroaryl portions independently are optionally substituted.
- heteroaryl used alone or as part of a larger moiety, e.g., “heteroaralkyl”, or “heteroaralkoxy”, refers to an optionally substituted group having 5 to 10 ring atoms, preferably 5, 6, or 9 ring atoms; having 6, 10, or 14 ⁇ electrons shared in a cyclic array; and having, in addition to carbon atoms, from one to five heteroatoms.
- Heteroaryl groups include, without limitation, thienyl, furanyl, pyrrolyl, imidazolyl, pyrazolyl, triazolyl, tetrazolyl, oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, isothiazolyl, thiadiazolyl, pyridyl, pyridazinyl, pyrimidinyl, pyrazinyl, indolizinyl, purinyl, naphthyridinyl, and pteridinyl.
- heteroaryl and “heteroar-”, as used herein, also include groups in which a heteroaromatic ring is fused to one or more aryl, carbocyclic, or heterocyclic rings, where the radical or point of attachment is on the heteroaromatic ring.
- Non limiting examples include indolyl, isoindolyl, benzothienyl, benzofuranyl, dibenzofuranyl, indazolyl, benzimidazolyl, benzthiazolyl, quinolyl, isoquinolyl, cinnolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, 4H- quinolizinyl, carbazolyl, acridinyl, phenazinyl, phenothiazinyl, phenoxazinyl, tetrahydroquinolinyl, and tetrahydroisoquinolinyl.
- a heteroaryl group may be mono- or bicyclic.
- heteroaryl may be used interchangeably with the terms “heteroaryl ring”, “heteroaryl group”, or “heteroaromatic”, any of which terms include rings that are optionally substituted.
- Heteroatom - refers to nitrogen, oxygen, or sulfur, and includes any oxidized form of nitrogen or sulfur, and any quaternized form of a basic nitrogen.
- nitrogen also includes a substituted nitrogen.
- Heterocyclic As used herein, the terms “heterocycle”, “heterocyclyl”, “heterocyclic radical”, and “heterocyclic ring” are used interchangeably and refer to a stable optionally substituted 5- to 7-membered monocyclic or 7- to 10-membered bicyclic heterocyclic moiety that is either saturated or partially unsaturated, and having, in addition to carbon atoms, one or more heteroatoms, as defined above.
- a heterocyclic ring can be attached to its pendant group at any heteroatom or carbon atom that results in a stable structure and any of the ring atoms can be optionally substituted.
- saturated or partially unsaturated heterocyclic radicals include, without limitation, tetrahydrofuranyl, tetrahydrothienyl, pyrrolidinyl, pyrrolidonyl, piperidinyl, pyrrolinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, decahydroquinolinyl, oxazolidinyl, piperazinyl, dioxanyl, dioxolanyl, diazepinyl, oxazepinyl, thiazepinyl, morpholinyl, and quinuclidinyl.
- heterocycle refers to an alkyl group substituted by a heterocyclyl, wherein the alkyl and heterocyclyl portions independently are optionally substituted.
- Unsaturated As used herein, the term "unsaturated”, means that a moiety has one or more double or triple bonds.
- Partially unsaturated refers to a ring moiety that includes at least one double or triple bond.
- the term “partially unsaturated” is intended to encompass rings having multiple sites of unsaturation, but is not intended to include aryl or heteroaryl moieties, as herein defined.
- compounds of the invention may contain “optionally substituted” moieties.
- substituted whether preceded by the term “optionally” or not, means that one or more hydrogens of the designated moiety are replaced with a suitable substituent.
- an “optionally substituted” group may have a suitable substituent at each substitutable position of the group, and when more than one position in any given structure may be substituted with more than one substituent selected from a specified group, the substituent may be either the same or different at every position.
- Combinations of substituents envisioned by this invention are preferably those that result in the formation of stable or chemically feasible compounds.
- Suitable monovalent substituents on R 0 are independently halogen, -(CH 2 V 2 R*, -(haloR*), -(CH 2 )o 2 OH, -(CH 2 ) 0 2 OR*, -(CH 2 ) 0 2 CH(OR*) 2 ; -O(haloR'), -CN, -N 3 , - (CH 2 )o 2 C(O)R*, -(CH 2 )O 2 C(O)OH, -(CH 2 ) 0 2 C(O)OR*, -(CH 2 ) 0 2 SR*, -(CH 2 ) 0 2 SH, -(CH 2 ) 0 2 NH 2 , -(CH 2 )o 2 NHR*, -(CH 2 ) 0 2 NR* 2 , -NO 2 , -SiR* 3
- Suitable divalent substituents that are bound to vicinal substitutable carbons of an "optionally substituted” group include: -O(CR 2 ) 2 3 O-, wherein each independent occurrence of R is selected from hydrogen, C i_6 aliphatic which may be substituted as defined below, or an unsubstituted 5-6-membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur.
- Suitable substituents on the aliphatic group of R include halogen, -R*, -(haloR*), -OH, -OR*, -O(haloR'), -CN, -C(O)OH, -C(O)OR*, -NH 2 , -NHR*, -NR* 2 , or -NO 2 , wherein each R* is unsubstituted or where preceded by "halo" is substituted only with one or more halogens, and is independently Ci_4 aliphatic, -CH 2 Ph, -O(CH 2 ) 0 iPh, or a 5-6-membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur.
- Suitable substituents on a substitutable nitrogen of an "optionally substituted" group include -R ⁇ -NR f 2 , -C(O)R f , -C(O)OR f , -C(O)C(O)R f , -C(O)CH 2 C(O)R 1 ⁇ , -S(O) 2 R 1 ; - S(O) 2 NR ⁇ , -C(S)NR ⁇ , -C(NH)NR ⁇ , or -N(R t )S(O) 2 R t ; wherein each R f is independently hydrogen, Ci_6 aliphatic which may be substituted as defined below, unsubstituted -OPh, or an unsubstituted 5-6-membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or, notwithstanding the definition above, two independent occurrences of R ⁇ taken together with their intervening atom(
- Suitable substituents on the aliphatic group of R 1 ⁇ are independently halogen, -R*, - (haloR*), -OH, -OR*, -O(haloR'), -CN, -C(O)OH, -C(O)OR*, -NH 2 , -NHR*, -NR* 2 , or - NO 2 , wherein each R* is unsubstituted or where preceded by "halo" is substituted only with one or more halogens, and is independently C 1 ⁇ t aliphatic, -CH 2 Ph, -O(CH 2 ) 0 iPh, or a 5-6- membered saturated, partially unsaturated, or aryl ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur.
- Suitable protecting group refers to amino protecting groups or hydroxyl protecting groups depending on its location within the compound and includes those described in detail in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3 rd edition, John Wiley & Sons, 1999.
- Suitable amino-protecting groups include methyl carbamate, ethyl carbamante, 9- fluorenylmethyl carbamate (Fmoc), 9-(2-sulfo)fluorenylmethyl carbamate, 9-(2,7- dibromo)fluoroenylmethyl carbamate, 2,7-di-t-butyl-[9-( 10,10-dioxo-l 0, 10,10,10- tetrahydrothioxanthyl)]methyl carbamate (DBD-Tmoc), 4-methoxyphenacyl carbamate (Phenoc), 2,2,2-trichloroethyl carbamate (Troc), 2-trimethylsilylethyl carbamate (Teoc), 2- phenylethyl carbamate (hZ), l-(l-adamantyl)-l-methylethyl carbamate (Adpoc), 1,1-dimethyl- 2-haloethyl carbamate,
- Suitable hydroxyl protecting groups include methyl, methoxylmethyl (MOM), methylthiomethyl (MTM), t-butylthiomethyl, (phenyldimethylsilyl)methoxymethyl (SMOM), benzyloxymethyl (BOM), /?-methoxybenzyloxymethyl (PMBM), (4-methoxyphenoxy)methyl (p-AOM), guaiacolmethyl (GUM), J-butoxymethyl, 4-pentenyloxymethyl (POM), siloxymethyl, 2-methoxyethoxymethyl (MEM), 2,2,2-trichloroethoxymethyl, bis(2- chloroethoxy)methyl, 2-(trimethylsilyl)ethoxymethyl (SEMOR), tetrahydropyranyl (THP), 3- bromotetrahydropyranyl, tetrahydrothiopyranyl, 1-methoxycyclohexyl, 4- methoxytetrahydropyranyl (MTHP), 4-methoxytetra
- the protecting groups include methylene acetal, ethylidene acetal, 1-J-butylethylidene ketal, 1-phenylethylidene ketal, (4- methoxyphenyl)ethylidene acetal, 2,2,2-trichloroethylidene acetal, acetonide, cyclopentylidene ketal, cyclohexylidene ketal, cycloheptylidene ketal, benzylidene acetal, /?-methoxybenzylidene acetal, 2,4-dimethoxybenzylidene ketal, 3,4-dimethoxybenzylidene acetal, 2-nitrobenzylidene acetal, methoxymethylene acetal, ethoxymethylene acetal, dimethoxymethylene ortho ester, 1- methoxy ethylidene ortho ester, 1- methoxy ethylidene
- a chemical variable e.g., an R group
- R group on such a ring can be attached at any suitable position, this is generally understood to mean that the group is attached in place of a hydrogen atom on the parent ring. This includes the possibility that two R groups can be attached to the same ring atom.
- each may be the same or different than other R groups attached thereto, and each group is defined independently of other groups that may be attached elsewhere on the same molecule, even though they may be represented by the same identifier.
- Biodegradable refers to molecules that degrade (i.e., lose at least some of their covalent structure) under physiological or endosomal conditions. Biodegradable molecules are not necessarily hydrolytically degradable and may require enzymatic action to degrade.
- Biomolecule refers to molecules (e.g., polypeptides, amino acids, polynucleotides, nucleotides, polysaccharides, sugars, lipids, nucleoproteins, glycoproteins, lipoproteins, steroids, metabolites, etc.) whether naturally- occurring or artificially created (e.g., by synthetic or recombinant methods) that are commonly found in cells and tissues.
- molecules e.g., polypeptides, amino acids, polynucleotides, nucleotides, polysaccharides, sugars, lipids, nucleoproteins, glycoproteins, lipoproteins, steroids, metabolites, etc.
- biomolecules include, but are not limited to, enzymes, receptors, neurotransmitters, hormones, cytokines, cell response modifiers such as growth factors and chemotactic factors, antibodies, vaccines, haptens, toxins, interferons, ribozymes, anti-sense agents, plasmids, DNA, and RNA.
- drugs refers to small molecules or biomolecules that alter, inhibit, activate, or otherwise affect a biological event.
- drugs may include, but are not limited to, anti-AIDS substances, anti-cancer substances, antibiotics, anti-diabetic substances, immunosuppressants, anti-viral substances, enzyme inhibitors, neurotoxins, opioids, hypnotics, anti-histamines, lubricants, tranquilizers, anti-convulsants, muscle relaxants and anti- Parkinson substances, anti-spasmodics and muscle contractants including channel blockers, miotics and anti-cholinergics, anti-glaucoma compounds, anti-parasite and/or anti-protozoal compounds, modulators of cell-extracellular matrix interactions including cell growth inhibitors and anti-adhesion molecules, vasodilating agents, inhibitors of DNA, RNA or protein synthesis, anti-hypertensives, analgesics, anti-pyretics, steroidal and non-steroidal
- an "exogenous" molecule is one which is not present at significant levels in a patient unless administered to the patient.
- the patient is a mammal, e.g., a human, a dog, a cat, a rat, a minipig, etc.
- a molecule is not present at significant levels in a patient if normal serum for that type of patient includes less than 0.1 mM of the molecule.
- normal serum for the patient may include less than 0.08 mM, less than 0.06 mM, or less than 0.04 mM of the molecule.
- Hyperbranched - As used herein, a "hyperbranched" structure is a covalent structure that includes at least one branched branch (e.g., a dendrimeric structure).
- a hyperbranched structure may include polymeric and/or non-polymeric substructures.
- Normal serum is serum obtained by pooling approximately equal amounts of the liquid portion of coagulated whole blood from five or more non-diabetic patients.
- a non-diabetic human patient is a randomly selected 18-30 year old who presents with no diabetic symptoms at the time blood is drawn.
- polymer As used herein, a "polymer” or “polymeric structure” is a structure that includes a string of covalently bound monomers.
- a polymer can be made from one type of monomer or more than one type of monomer.
- the term “polymer” therefore encompasses copolymers, including block-copolymers in which different types of monomer are grouped separately within the overall polymer.
- a polymer can be linear or branched.
- the terms “polynucleotide”, “nucleic acid”, and “oligonucleotide” may be used interchangeably.
- the polymer may include natural nucleosides (i.e., adenosine, thymidine, guanosine, cytidine, uridine, deoxyadenosine, deoxythymidine, deoxyguanosine, and deoxy cytidine), nucleoside analogs (e.g., 2-aminoadenosine, 2-thiothymidine, inosine, pyrrolo-pyrimidine, 3-methyl adenosine, 5-methylcytidine, C5-bromouridine, C5-fluorouridine, C5-iodouridine, C5-propynyl-uridine, C5-propynyl-cytidine, C5-methylcytidine, 7-deazaadenosine, 7-deazaguanosine, 8-oxoadenosine, 8-oxoguanosine, O(6)-methylguanine, 4-acetylcytidine
- the terms “polypeptide”, “protein”, “oligopeptide”, and “peptide” may be used interchangeably.
- Polypeptides may contain natural amino acids, non-natural amino acids (i.e., compounds that do not occur in nature but that can be incorporated into a polypeptide chain) and/or amino acid analogs as are known in the art.
- amino acid residues in a polypeptide may be modified, for example, by the addition of a chemical entity such as a carbohydrate group, a phosphate group, a farnesyl group, an isofarnesyl group, a fatty acid group, a linker for conjugation, functionalization, or other modification, etc.
- modifications may include cyclization of the peptide, the incorporation of D-amino acids, etc.
- polysaccharide is a polymer of saccharides.
- the terms “polysaccharide”, “carbohydrate”, and “oligosaccharide”, may be used interchangeably.
- the polymer may include natural saccharides (e.g., arabinose, lyxose, ribose, xylose, ribulose, xylulose, allose, altrose, galactose, glucose, gulose, idose, mannose, talose, fructose, psicose, sorbose, tagatose, mannoheptulose, sedoheptulose, octolose, and sialose) and/or modified saccharides (e.g., 2'-fluororibose, 2'-deoxyribose, and hexose).
- natural saccharides e.g., arabinose, lyxose, ribose, xy
- Exemplary disaccharides include sucrose, lactose, maltose, trehalose, gentiobiose, isomaltose, kojibiose, laminaribiose, mannobiose, melibiose, nigerose, rutinose, and xylobiose.
- small molecule refers to molecules, whether naturally-occurring or artificially created (e.g., via chemical synthesis), that have a relatively low molecular weight. Typically, small molecules are monomeric and have a molecular weight of less than about 1500 Da. Preferred small molecules are biologically active in that they produce a local or systemic effect in animals, preferably mammals, more preferably humans.
- the small molecule is a drug.
- the drug is one that has already been deemed safe and effective for use by the appropriate governmental agency or body.
- drugs for human use listed by the FDA under 21 C.F.R. ⁇ 330.5, 331 through 361, and 440 through 460; drugs for veterinary use listed by the FDA under 21 C.F.R. ⁇ 500 through 589 are all considered acceptable for use in accordance with the present invention.
- Treat - As used herein, the term “treat” refers to the administration of a conjugate of the present disclosure to a subject in need thereof with the purpose to alleviate, relieve, alter, ameliorate, improve or affect a condition (e.g., diabetes), a symptom or symptoms of a condition (e.g., hyperglycemia), or the predisposition toward a condition.
- a condition e.g., diabetes
- a symptom or symptoms of a condition e.g., hyperglycemia
- predisposition toward a condition e.g., hyperglycemia
- Figure 1 Comparison between RP-HPLC chromatograms obtained for (a) exemplary conjugate synthesized using TSAT-C6 as the scaffold, AEM as the ligand, and NH 2 -Bl- BOC2(Al,B29)-insulin as the drug (conjugate 1-1) and (b) an insulin-glycogen conjugate synthesized according to Example 32.
- Figure 2 Accelerated stability testing (AST) aggregation assay for conjugate 1-1 (D), conjugate 1-16 ( ⁇ ), and RHI ( ⁇ ) in PBS buffer.
- the conjugates demonstrate greatly enhanced stability over pharmaceutical grade RHI.
- Figure 3 Accelerated stability testing (AST) chemical stability results: (a) RP-HPLC AST conjugate stability and (b) LC/MS data on AST conjugates.
- the 72 hr AST conjugate bioactivity was indistinguishable from that of the fresh conjugate (p > 0.21 for all timepoints).
- Figure 10 Chemical structures of AEG, AEM, AEBM and AETM. The affinity of these saccharide based ligands for Con A increases as shown.
- Figure 11 Chemical structures of some exemplary non-dendrimeric conjugate intermediates. Exemplary conjugate ligands that include a saccharide are also shown for illustrative purposes (AEG, AEM, AEBM, AETM, AEGA and AEF).
- the glucose lowering response decreases as the affinity of the ligand increases.
- Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with AETM for binding to lectins such as Con A.
- the change in PK/PD profile that results from injection of alpha-methyl mannose is very significant (p ⁇ 0.05).
- Figure 21 Plot of serum insulin levels following subcutaneous injection in non-diabetic, male SD rats at time 0 with TSAT-C6-AETM-2 conjugate 1-2 followed by IP injection of glucose ( ⁇ ), galactose ( ⁇ ) or saline (A) after 15 minutes.
- galactose exhibits no effect as compared to saline.
- Glucose appears to exhibit a small effect; however, this is complicated by the fact that the exogenous insulin from the conjugate quickly lowers the glucose, so the sustained effect observed with alpha-methyl mannose and L-fucose does not occur.
- the rats were subsequently injected at 15 min. with the same volume of saline solution used in (b) at a different subcutaneous site than the one used for the conjugate solution.
- the rats were subsequently injected at 15 min. with the same volume of IM alpha-methyl mannose solution used in (a) at a different subcutaneous site than the one used for the conjugate solution.
- the serum insulin levels do not increase and the blood glucose levels do not decrease in experiment (a) relative to experiment (b).
- Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with AEM for binding to lectins such as Con A. As shown, the change in PK/PD profile that results from injection of alpha-methyl mannose is very significant (p ⁇ 0.05).
- Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with AEM for binding to lectins such as Con A.
- the change in PK/PD profile that results from injection of alpha-methyl mannose is not significant.
- Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with AEM for binding to lectins such as Con A.
- the change in PK/PD profile that results from injection of alpha-methyl mannose is as not significant.
- Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with
- Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with
- Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with
- Figure 30 Plot of serum insulin concentration as a function of time for 0.4 mg/kg i.v. injections of ( ⁇ ) RHI and (A) TSAT-C6-AETM-2 conjugate 1-6 into non-diabetic, male SD rats
- TSAT-C6-AETM-2 (1-6) conjugates followed by IP injection of glucose (4 g/kg) at 240 minutes.
- TSAT-C6-AETM-2 (1-6) conjugates followed by IP injection of glucose (4 g/kg) at 240 minutes.
- Formulations were prepared as described in Example 52: (a) 4xP-lxZ and (b) 4xP-2xZ.
- Formulations were prepared as described in Example 52: (a) 1OxP-IxZ and (b) 10xP-2xZ.
- Formulations were prepared as described in Example 53: (a) no cresol and (b) 4x cresol.
- Formulations were prepared as described in Example 54: (a) no salt, (b) 3.3x salt, and (c) glycerol.
- Formulations were prepared containing increasing amounts of unmodified insulin as described in Example 55: (a) 1/24, (b) 1/12, and (c) 1/6.
- the conjugates are DSS-AEM-I (1-8), DSS-AETM-I (1-10), TSAT-C6- AEM-2 (1-7), C6-amide-AEM-2 (1-17), TSPE-AEM-3 (1-9), and TSPE- AETM-3 (1-11).
- the conjugates are (a) TSAT-C6-AETM-2 (1-6) and (b) TSAT-C6-GA-2.
- Figure 42 Plot of blood glucose levels following subcutaneous injection in non-diabetic (normals) and diabetic (DM's) male SD rats at time 0 with TSAT-C6-AETM-2 (B29-substituted, PZI) conjugate 1-6.
- the conjugate was administered at 5, 10 and 20 U/kg.
- the non- diabetic male SD rats did not show any hypoglycemia while the glucose levels in diabetic male SD rats showed a clear dose proportional response that lasted for over 8 hours at the highest dose.
- Figure 43 Plot of blood glucose levels over 24 hours following subcutaneous injection in non-diabetic (normals) and diabetic (DM's) male SD rats at time 0 with TSAT-C6-AETM-2 (B29-substituted, PZI) conjugate 1-6. The conjugate was administered at 7, 14 and 28 U/kg.
- Figure 45 Structures of exemplary insulin-conjugates. As described in the Examples, these conjugates were each prepared with recombinant wild-type human insulin (see Figure 63 for the structure of wild-type human insulin). The symbol "insulin" inside an oval as shown in Figure 45 is therefore primarily intended to represent a wild-type human insulin. As discussed herein, it is to be understood that the present disclosure also encompasses inter alia versions of these and other conjugates that include an insulin molecule other than wild-type human insulin.
- Figure 46 Plots of serum insulin concentration as a function of time following injection of conjugate 1-6 or RHI (left) and conjugate 1-6 with and without glucose or ⁇ -methyl mannose (right).
- Figure 49 Composition of insulin conjugates tested in non-diabetic minipig sugar- dependent elimination half-life studies. As described in the Examples, these conjugates were each prepared with recombinant wild-type human insulin (see Figure 63 for the structure of wild- type human insulin). The schematic in Figure 49 is therefore primarily intended to represent a wild-type human insulin. As discussed herein, it is to be understood that the present disclosure also encompasses inter alia versions of these and other conjugates that include an insulin molecule other than wild-type human insulin.
- Figure 50 ⁇ -phase elimination half-life results in non-diabetic minipigs during glucose, ⁇ -methyl mannose or saline infusion.
- the animals were infused with ( ⁇ ) i.v. alpha methyl mannose (a-MM) solution (25% w/v infused at constant rate of 80 ml/h) or (v4) no solution.
- Data are plotted as the average values fit with a curve derived from the two-compartment, bi-exponential model.
- Figure 53(b) scale is enlarged for clarity.
- Figure 54(b) scale is enlarged for clarity.
- Figure 55 Additional insulin conjugates for use in non-diabetic minipig sugar-dependent elimination half- life studies. As described in the Examples, these conjugates were each prepared with recombinant wild-type human insulin (see Figure 63 for the structure of wild-type human insulin). The schematic in Figure 55 is therefore primarily intended to represent a wild-type human insulin. As discussed herein, it is to be understood that the present disclosure also encompasses inter alia versions of these and other conjugates that include an insulin molecule other than wild-type human insulin.
- Figure 56 Plots of serum insulin concentration as a function of time following administration of RHI or conjugate 1-6 in rats and minipigs.
- Figure 57 Summary of i.v. half- life results in minipigs for additional insulin-conjugates.
- Figure 58 Plot of serum insulin levels after a single subcutaneous injection of 0.25, 0.5 and 1 U/kg insulin conjugate II-2 in diabetic and normal minipigs.
- Figure 59 Plots of serum glucose levels after i.v. injections of RHI and conjugates 1-6,
- Figure 60 Structures of selected insulin conjugates (C3, C4, and C7) tested in minipigs as controls, along with insulin conjugates 1-6, 1-12, II-2, and II-3. As described in the Examples, these conjugates were each prepared with recombinant wild-type human insulin (see Figure 63 for the structure of wild-type human insulin).
- the schematic in Figure 60 is therefore primarily intended to represent a wild-type human insulin.
- the present disclosure also encompasses inter alia versions of these and other conjugates that include an insulin molecule other than wild-type human insulin.
- Figure 61 Plots of serum glucose levels after i.v. injections of RHI and insulin conjugates 1-6, 1-12, II-2 and C3 in minipigs with and without a-MM infusion.
- Figure 62 Plots of serum glucose levels after i.v. injections of RHI and insulin conjugates C7, C4, II-3 and II-2 in minipigs with and without a-MM infusion.
- Figure 63 Structure of wild-type human insulin.
- the disclosure provides methods for controlling the pharmacokinetic (PK) and/or pharmacodynamic (PD) profiles of a drug such as insulin in a manner that is responsive to the systemic concentrations of a saccharide such as glucose.
- PK pharmacokinetic
- PD pharmacodynamic
- the methods are based in part on the discovery that when certain insulin-conjugates were modified to include high affinity saccharide ligands they could be made to exhibit PK/PD profiles that responded to saccharide concentration changes even in the absence of an exogenous multivalent saccharide-binding molecule such as Con A. This finding was unexpected and provides an unprecedented opportunity to generate simple lectin-free saccharide-responsive drug systems.
- the disclosure provides exemplary conjugates and methods for making these.
- these conjugates include a drug and one or more separate ligands that each include a saccharide.
- the ligands are capable of competing with a saccharide (e.g., glucose or mannose) for binding to an endogenous saccharide-binding molecule.
- the ligands are capable of competing with glucose or mannose for binding to Con A.
- the ligands and drug may be covalently or non-covalently attached to a conjugate framework.
- the framework is non-polymeric.
- a conjugate may have a polydispersity index of one and a MW of less than about 20,000 Da.
- the conjugate is of formula (I) or (II) as defined and described herein.
- the conjugate is long acting (i.e., exhibits a PK profile that is more sustained than soluble recombinant human insulin or RHI).
- the methods, conjugates and formulations that are described herein are in no way limited to the delivery of insulin and that they can be used to deliver any drug. It is also to be understood that the methods may be used to deliver drugs in response to saccharides other than glucose.
- exemplary conjugates have been shown to respond to exogenous saccharides such as alpha-methyl mannose and L-fucose. In certain embodiments, this can be used to prepare conjugates that can be controlled by administration of one of these exogenous saccharides (i.e., instead of or in addition to being controlled by fluctuations in endogenous glucose).
- the disclosure provides conjugates that comprise a drug and a ligand that includes a first saccharide.
- the ligand (or ligands when the conjugates include more than one ligand) are such that when the conjugate is administered to a mammal at least one pharmacokinetic or pharmacodynamic property of the conjugate is sensitive to the serum concentration of a second saccharide.
- the PK and/or PD properties of the conjugate are sensitive to the serum concentration of an endogenous saccharide such as glucose.
- the PK and/or PD properties of the conjugate are sensitive to the serum concentration of an exogenous saccharide, e.g., without limitation, mannose, L-fucose, N-acetyl glucosamine and/or alpha-methyl mannose.
- an exogenous saccharide e.g., without limitation, mannose, L-fucose, N-acetyl glucosamine and/or alpha-methyl mannose.
- the ligand(s) and drug may be covalently or non-covalently attached to a conjugate framework.
- the molecular weight of the conjugate absent the drug is less than about 10,000 Da.
- the molecular weight of the conjugate absent the drug may be in the range of about 250 to about 5,000 Da, about 450 to about 3,500 Da, about 750 to about 2,500 Da, or about 900 to about 2,000 Da.
- the molecular weight of the conjugate including the drug is less than about 20,000 Da.
- the molecular weight of the conjugate including the drug may be in the range of about 2,000 to about 18,000 Da, about 4,000 to about 15,000 Da, about 5,000 to about 10000 Da, or about 6,500 to about 8,000 Da.
- the conjugate has a unique molecular weight (i.e., has a polydispersity index of one).
- the pharmacokinetic and/or pharmacodynamic behavior of a conjugate may be modified by variations in the serum concentration of a saccharide.
- the serum concentration curve may shift upward when the serum concentration of the saccharide (e.g., glucose) increases or when the serum concentration of the saccharide crosses a threshold (e.g., is higher than normal glucose levels).
- the serum concentration curve of a conjugate is substantially different when administered to the mammal under fasted and hyperglycemic conditions.
- substantially different means that the two curves are statistically different as determined by a student t-test (p ⁇ 0.05).
- fasted conditions means that the serum concentration curve was obtained by combining data from five or more fasted non-diabetic individuals.
- a fasted non-diabetic individual is a randomly selected 18-30 year old human who presents with no diabetic symptoms at the time blood is drawn and who has not eaten within 12 hours of the time blood is drawn.
- hypoglycemic conditions means that the serum concentration curve was obtained by combining data from five or more fasted non-diabetic individuals in which hyperglycemic conditions (glucose C max at least 100 mg/dL above the mean glucose concentration observed under fasted conditions) were induced by concurrent administration of conjugate and glucose.
- Concurrent administration of conjugate and glucose simply requires that the glucose C max occur during the period when the conjugate is present at a detectable level in the serum. For example, a glucose injection (or ingestion) could be timed to occur shortly before, at the same time or shortly after the conjugate is administered.
- the conjugate and glucose are administered by different routes or at different locations.
- the conjugate is administered subcutaneously while glucose is administered orally or intravenously.
- the serum C max of the conjugate is higher under hyperglycemic conditions as compared to fasted conditions. Additionally or alternatively, in certain embodiments, the serum area under the curve (AUC) of the conjugate is higher under hyperglycemic conditions as compared to fasted conditions. In various embodiments, the serum elimination rate of the conjugate is slower under hyperglycemic conditions as compared to fasted conditions. As discussed in the Examples, we have found that in certain embodiments, the serum concentration curve of the conjugates can be fit using a two-compartment bi-exponential model with one short and one long half- life. The long half- life appears to be particularly sensitive to glucose concentration.
- the long half-life is longer under hyperglycemic conditions as compared to fasted conditions.
- the fasted conditions involve a glucose C max of less than 100 mg/dL (e.g., 80 mg/dL, 70 mg/dL, 60 mg/dL, 50 mg/dL, etc.).
- the hyperglycemic conditions involve a glucose C max in excess of 200 mg/dL (e.g., 300 mg/dL, 400 mg/dL, 500 mg/dL, 600 mg/dL, etc.).
- MRT mean serum residence time
- MAT mean serum absorption time
- the normal range of glucose concentrations in humans, dogs, cats, and rats is 60 to 200 mg/dL.
- One skilled in the art will be able to extrapolate the following values for species with different normal ranges (e.g., the normal range of glucose concentrations in miniature pigs is 40 to 150 mg/dl).
- Glucose concentrations below 60 mg/dL are considered hypoglycemic.
- Glucose concentrations above 200 mg/dL are considered hyperglycemic.
- the PK properties of the conjugate may be tested using a glucose clamp method (see Examples) and the serum concentration curve of the conjugate may be substantially different when administered at glucose concentrations of 50 and 200 mg/dL, 50 and 300 mg/dL, 50 and 400 mg/dL, 50 and 500 mg/dL, 50 and 600 mg/dL, 100 and 200 mg/dL, 100 and 300 mg/dL, 100 and 400 mg/dL, 100 and 500 mg/dL, 100 and 600 mg/dL, 200 and 300 mg/dL, 200 and 400 mg/dL, 200 and 500 mg/dL, 200 and 600 mg/dL, etc.
- the serum T max , serum C max , mean serum residence time (MRT), mean serum absorption time (MAT) and/or serum half-life may be substantially different at the two glucose concentrations.
- MRT mean serum residence time
- MAT mean serum absorption time
- serum half-life may be substantially different at the two glucose concentrations.
- 100 mg/dL and 300 mg/dL may be used as comparative glucose concentrations.
- the present disclosure encompasses each of these embodiments with an alternative pair of comparative glucose concentrations including, without limitation, any one of the following pairs: 50 and 200 mg/dL, 50 and 300 mg/dL, 50 and 400 mg/dL, 50 and 500 mg/dL, 50 and 600 mg/dL, 100 and 200 mg/dL, 100 and 400 mg/dL, 100 and 500 mg/dL, 100 and 600 mg/dL, 200 and 300 mg/dL , 200 and 400 mg/dL, 200 and 500 mg/dL, 200 and 600 mg/dL, etc.
- the C max of the conjugate is higher when administered to the mammal at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose). In certain embodiments, the C max of the conjugate is at least 50% (e.g., at least 100%, at least 200% or at least 400%) higher when administered to the mammal at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose).
- the AUC of the conjugate is higher when administered to the mammal at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose). In certain embodiments, the AUC of the conjugate is at least 50% (e.g., at least e.g., at least 100%, at least 200% or at least 400%) higher when administered to the mammal at at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose).
- the serum elimination rate of the conjugate is slower when administered to the mammal at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose). In certain embodiments, the serum elimination rate of the conjugate is at least 25% (e.g., at least 50%, at least 100%, at least 200%, or at least 400%) faster when administered to the mammal at at the lower of the two glucose concentrations (e.g., 100 vs. 300 mg/dL glucose). As discussed in the Examples, we have found that in certain embodiments the serum concentration curve of conjugates can be fit using a two-compartment bi-exponential model with one short and one long half-life. The long half-life appears to be particularly sensitive to glucose concentration.
- the long half-life is longer when administered to the mammal at at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose). In certain embodiments, the long half-life is at least 50% (e.g., at least 100%, at least 200% or at least 400%) longer when administered to the mammal at at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose).
- the present disclosure provides a method in which the serum concentration curve of a conjugate is obtained at two different glucose concentrations (e.g., 300 vs. 100 mg/dL glucose); the two curves are fit using a two-compartment bi-exponential model with one short and one long half-life; and the long half-lives obtained under the two glucose concentrations are compared.
- this method may be used as an assay for testing or comparing the glucose sensitivity of one or more conjugates.
- the present disclosure provides a method in which the serum concentration curves of a conjugated drug (e.g., an insulin conjugate of the present disclosure) and an unconjugated version of the drug (e.g., RHI) are obtained under the same conditions (e.g., fasted conditions); the two curves are fit using a two-compartment bi-exponential model with one short and one long half-life; and the long half-lives obtained for the conjugated and unconjugated drug are compared.
- this method may be used as an assay for identifying conjugates that are cleared more rapidly than the unconjugated drug.
- the serum concentration curve of a conjugate is substantially the same as the serum concentration curve of an unconjugated version of the drug when administered to the mammal under hyperglycemic conditions.
- the term “substantially the same” means that there is no statistical difference between the two curves as determined by a student t-test (p > 0.05).
- the serum concentration curve of the conjugate is substantially different from the serum concentration curve of an unconjugated version of the drug when administered under fasted conditions.
- the serum concentration curve of the conjugate is substantially the same as the serum concentration curve of an unconjugated version of the drug when administered under hyperglycemic conditions and substantially different when administered under fasted conditions.
- the hyperglycemic conditions involve a glucose C max in excess of 200 mg/dL (e.g., 300 mg/dL, 400 mg/dL, 500 mg/dL, 600 mg/dL, etc.).
- the fasted conditions involve a glucose C max of less than 100 mg/dL (e.g., 80 mg/dL, 70 mg/dL, 60 mg/dL, 50 mg/dL, etc.).
- PK parameters such as serum T max , serum C max , AUC, mean serum residence time (MRT), mean serum absorption time (MAT) and/or serum half-life could be compared.
- the bioactivity of the conjugate may increase when the glucose concentration increases or when the glucose concentration crosses a threshold, e.g., is higher than normal glucose levels.
- the bioactivity of a conjugate is lower when administered under fasted conditions as compared to hyperglycemic conditions.
- the fasted conditions involve a glucose C max of less than 100 mg/dL (e.g., 80 mg/dL, 70 mg/dL, 60 mg/dL, 50 mg/dL, etc.).
- the hyperglycemic conditions involve a glucose C max in excess of 200 mg/dL (e.g., 300 mg/dL, 400 mg/dL, 500 mg/dL, 600 mg/dL, etc.).
- the PD properties of the conjugate may be tested by measuring the glucose infusion rate (GIR) required to maintain a steady glucose concentration.
- GIR glucose infusion rate
- the bioactivity of the conjugate may be substantially different when administered at glucose concentrations of 50 and 200 mg/dL, 50 and 300 mg/dL, 50 and 400 mg/dL, 50 and 500 mg/dL, 50 and 600 mg/dL, 100 and 200 mg/dL, 100 and 300 mg/dL, 100 and 400 mg/dL, 100 and 500 mg/dL, 100 and 600 mg/dL, 200 and 300 mg/dL , 200 and 400 mg/dL, 200 and 500 mg/dL, 200 and 600 mg/dL, etc.
- the bioactivity of the conjugate is higher when administered to the mammal at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose).
- the bioactivity of the conjugate is at least 25% (e.g., at least 50% or at least 100%) higher when administered to the mammal at the higher of the two glucose concentrations (e.g., 300 vs. 100 mg/dL glucose).
- the conjugate includes an insulin molecule as the drug.
- the PD behavior for insulin can be observed by comparing the time to reach minimum blood glucose concentration (T nadir ), the duration over which the blood glucose level remains below a certain percentage of the initial value (e.g., 70% of initial value or T 7 OOZ 0 BGL), etc.
- any of the PK and PD characteristics discussed in this section can be determined according to any of a variety of published pharmacokinetic and pharmacodynamic methods (e.g., see Baudys et al, Bioconjugate Chem. 9:176-183, 1998 for methods suitable for subcutaneous delivery). It is alos to be understood that the PK and/or PD properties may be measured in any mammal (e.g., a human, a rat, a cat, a minipig, a dog, etc.). In certain embodiments, PK and/or PD properties are measured in a human. In certain embodiments, PK and/or PD properties are measured in a rat.
- PK and/or PD properties are measured in a minipig. In certain embodiments, PK and/or PD properties are measured in a dog. It will also be appreciated that while the foregoing was described in the context of glucose-responsive conjugates, the same properties and assays apply to conjugates that are responsive to other saccharides including exogenous saccharides, e.g., mannose, L-fucose, N- acetyl glucosamine, alpha-methyl mannose, etc.
- exogenous saccharides e.g., mannose, L-fucose, N- acetyl glucosamine, alpha-methyl mannose, etc.
- the PK and/or PD properties may be compared under fasted conditions with and without administration of the exogenous saccharide. It is to be understood that conjugates can be designed that respond to different C max values of a given exogenous saccharide.
- the conjugates include at least one ligand.
- the conjugates include a single ligand.
- the conjugates include at least two separate ligands, e.g., 2, 3, 4, 5 or more ligands. When more than one ligand is present the ligands may have the same or different chemical structures.
- the ligands are capable of competing with a saccharide (e.g., glucose or mannose) for binding to an endogenous saccharide-binding molecule (e.g., without limitation surfactant proteins A and D or members of the selectin family).
- an endogenous saccharide-binding molecule e.g., without limitation surfactant proteins A and D or members of the selectin family.
- the ligands are capable of competing with a saccharide (e.g., glucose or mannose) for binding to cell-surface sugar receptor (e.g., without limitation macrophage mannose receptor, glucose transporter ligands, endothelial cell sugar receptors, or hepatocyte sugar receptors).
- the ligands are capable of competing with glucose for binding to an endogenous glucose-binding molecule (e.g., without limitation surfactant proteins A and D or members of the selectin family).
- the ligands are capable of competing with a saccharide for binding to a non-human lectin (e.g., Con A).
- the ligands are capable of competing with glucose or mannose for binding to a non-human lectin (e.g., Con A).
- Exemplary glucose-binding lectins include calnexin, calreticulin, N- acetylglucosamine receptor, selectin, asialoglycoprotein receptor, collectin (mannose-binding lectin), mannose receptor, aggrecan, versican, pisum sativum agglutinin (PSA), vicia faba lectin, lens culinaris lectin, soybean lectin, peanut lectin, lathyrus ochrus lectin, sainfoin lectin, sophora japonica lectin, bowringia milbraedii lectin, concanavalin A (Con A), and pokeweed mitogen.
- the ligand is of formula (Ilia) or (HIb):
- each R 1 is independently hydrogen, -OR y , -N(R y ) 2 , -SR y , -O-Y, -G-Z, or -CH 2 R X ; each R x is independently hydrogen, -OR y , -N(R y ) 2 , -SR y , or -O-Y; each R y is independently -R 2 , -SO 2 R 2 , -S(O)R 2 , -P(O)(OR 2 ) 2 , -C(O)R 2 , -CO 2 R 2 , or - C(O)N(R 2 ) 2 ; each Y is independently a monosaccharide, disaccharide, or trisaccharide; each G is independently a covalent bond or an optionally substituted Ci_ 9 alkylene, wherein one or more methylene units of G is optionally replaced by -O-, -S-, -N(R)
- each Z is independently halogen, -N(R 2 ) 2 , -OR 2 , -SR 2 , -N 3 , -C ⁇ CR 2 , -CO 2 R 2 , -C(O)R 2 , or -
- each R 2 is independently hydrogen or an optionally substituted group selected from Ci_6 aliphatic, phenyl, a 4-7 membered heterocyclic ring having 1-2 heteroatoms selected from nitrogen, oxygen, or sulfur, or a 5-6 membered monocyclic heteroaryl ring having 1-4 heteroatoms selected from nitrogen, oxygen, or sulfur.
- the ligand of formula (Ilia) or (HIb) is a monosaccharide.
- the ligand is a disaccharide.
- the ligand is a trisaccharide.
- the ligand is a tetrasaccharide.
- the ligand comprises no more than a total of four monosaccharide moieties.
- each R 1 is independently hydrogen, -OR y , -N(R y )2, -SR y , -
- R 1 is hydrogen. In certain embodiments, R 1 is -OH. In other embodiments, R 1 is -NHC(O)CHs. In certain embodiments, R 1 is -O-Y. In certain other embodiments, R 1 is -G-Z. In some embodiments, R 1 is -CH 2 OH. In other embodiments, R 1 is -CH 2 -O-Y. In yet other embodiments, R 1 is -NH 2 .
- each R 1 substituent in formula (Ilia) or (HIb) may be of (R) or (S) stereochemistry.
- each R x is independently hydrogen, -0R y , -N(R y ) 2 , -SR y , or -O-Y. In some embodiments, R x is hydrogen. In certain embodiments, R x is -OH. In other embodiments, R x is -O-Y. As defined generally above, each R y is independently -R 2 , -SO 2 R 2 , -S(O)R 2 , -
- R y is hydrogen. In other embodiments, R y is -R 2 . In some embodiments, R y is -C(O)R 2 . In certain embodiments, R y is acetyl. In other embodiments, R y is -SO 2 R 2 , -S(O)R 2 , -P(O)(OR 2 ) 2 , -CO 2 R 2 , or - C(O)N(R 2 ) 2 .
- Y is a monosaccharide, disaccharide, or trisaccharide. In certain embodiments, Y is a monosaccharide. In some embodiments, Y is a disaccharide. In other embodiments, Y is a trisaccharide. In some embodiments, Y is mannose, glucose, fructose, galactose, rhamnose, or xylopyranose. In some embodiments, Y is sucrose, maltose, turanose, trehalose, cellobiose, or lactose. In certain embodiments, Y is mannose. In certain embodiments, Y is D-mannose.
- the saccharide Y is attached to the oxygen group of -O-Y through anomeric carbon to form a glycosidic bond. The glycosidic bond may be of an alpha or beta configuration.
- each G is independently a covalent bond or an optionally substituted Ci_9 alkylene, wherein one or more methylene units of G is optionally replaced by - 0-, -S-, -N(R 2 ) -, -C(O) -, -OC(O) -, -C(O)O-, -C(O)N(R 2 ) -, -N(R 2 )C(0) -, - N(R 2 )C(O)N(R 2 ) -, -SO 2 -, -SO 2 N(R 2 )-, -N(R 2 )SO 2 - or -N(R 2 )SO 2 N(R 2 )-.
- G is a covalent bond.
- G is -0-C 1-8 alkylene.
- G is -OCH 2 CH 2 -.
- each Z is independently halogen, -N(R 2 ) 2 , -OR 2 , -SR 2 , -N 3 , -C ⁇ CR 2 , -CO 2 R 2 , -C(O)R 2 , or -OSO 2 R 2 .
- Z is a halogen or -OSO 2 R 2 .
- Z is -N 3 or -C ⁇ CR 2 .
- Z is -N(R 2 ) 2 , -OR 2 , or - SR 2 .
- Z is -SH.
- Z is -NH 2 .
- -G-Z is -OCH 2 CH 2 NH 2 .
- the R 1 substituent on the Cl carbon of formula (Ilia) is -G-Z to give a compound of formula (Illa-z):
- R 1 , G, and Z are as defined and described herein.
- the ligand is of formula (Illa-z ⁇ ):
- R 1 , R x , G, and Z are as defined and described herein.
- the ligand(s) may have the same chemical structure as glucose or may be a chemically related species of glucose. In various embodiments it may be advantageous for the ligand(s) to have a different chemical structure from glucose, e.g., in order to fine tune the glucose response of the conjugate.
- a ligand that includes glucose, mannose, L-fucose or derivatives of these (e.g., alpha-L-fucopyranoside, mannosamine, beta-linked N-acetyl mannosamine, methylglucose, methylmannose, ethylglucose, ethylmannose, propylglucose, propylmannose, etc.) and/or higher order combinations of these (e.g., a bimannose, linear and/or branched trimannose, etc.).
- the ligand includes a monosaccharide. In certain embodiments, the ligand includes a disaccharide. In certain embodiments, the ligand is includes a trisaccharide. In some embodiments, the ligand comprises a saccharide and one or more amine groups. In certain embodiments the saccharide and amine group are separated by a Ci-C 6 alkyl group, e.g., a C1-C3 alkyl group. In some embodiments, the ligand is aminoethylglucose (AEG). In some embodiments, the ligand is aminoethylmannose (AEM). In some embodiments, the ligand is aminoethylbimannose (AEBM).
- AEG aminoethylglucose
- AEM aminoethylmannose
- AEBM aminoethylbimannose
- the ligand is aminoethyltrimannose (AETM). In some embodiments, the ligand is ⁇ -aminoethyl-N-acetylglucosamine (AEGA). In some embodiments, the ligand is aminoethylfucose (AEF). In certain embodiments, a saccharide ligand is of the "D" configuration. In other embodiments, a saccharide ligand is of the "L" configuration. Below we show the structures of these exemplary ligands. Other exemplary ligands will be recognized by those skilled in the art.
- ligands may be directly or indirectly conjugated (i.e., via a linker or framework) to the drug.
- the ligands may be naturally present within a conjugate framework (e.g., as part of a polymer backbone or as a side group of a monomer).
- ligands may be artificially incorporated into a conjugate framework (e.g., in the form of a chemical group that is synthetically added to a conjugate framework).
- a conjugate may include a framework which comprises 5 or more, 10 or more, or 20 or more ligands.
- a conjugate may comprise as few as 1, 2, 3, 4 or 5 separate ligands.
- At least two separate ligands are conjugated to the drug via different conjugation points. In certain embodiments, at least two separate ligands are conjugated to a single conjugate framework that is also conjugated to the drug. In some embodiments, at least one ligand, such as AETM, AEG, AEM, AEBM, AEGA, or AEF, is conjugated to one insulin molecule. In certain embodiments, at least one AETM ligand is conjugated to one insulin molecule. In some embodiments, at least two ligands, such as AETM, AEG, AEM, AEBM, AEGA, or AEF, are conjugated to one insulin molecule, either through one conjugation point or multiple conjugation points.
- the at least two ligands are not the same ligand. In certain embodiments, the at least two ligands are the same ligand. In certain embodiments, at least two AETM ligands are conjugated to one insulin molecule, either through one conjugation point or multiple conjugation points. As discussed in more detail below in the context of certain exemplary conjugate frameworks, in certain embodiments the separate ligands and drug (e.g., an insulin molecule) may each be located on a separate branch of a branched conjugate framework. For example, the ligands and drug may be located on termini of these branches. In certain embodiments a hyperbranched conjugate framework may be used. Both polymeric and non-polymeric conjugate frameworks are encompassed.
- the saccharide within the one or more ligands is conjugated (directly or indirectly by way of a linker) via the Cl, C2 or C6 position.
- the conjugation involves the Cl position.
- the Cl position of a saccharide is also referred to as the anomeric carbon and may be connected to the drug or conjugate framework in the alpha or beta conformation.
- the Cl position is configured as the alpha anomer. In other embodiments, the Cl position is configured as the beta anomer.
- a conjugate can comprise any drug.
- a conjugate can comprise more than one copy of the same drug and/or can comprise more than one type of drug.
- the conjugates are not limited to any particular drug and may include small molecule drugs or biomolecular drugs.
- the drug(s) used will depend on the disease or disorder to be treated.
- the term "drug” encompasses salt and non-salt forms of the drug.
- the term "insulin molecule” encompasses all salt and non-salt forms of the insulin molecule. It will be appreciated that the salt form may be anionic or cationic depending on the drug.
- a conjugate can comprise any one of the following drugs: diclofenac, nifedipine, rivastigmine, methylphenidate, fluoroxetine, rosiglitazone, prednison, prednisolone, codeine, ethylmorphine, dextromethorphan, noscapine, pentoxiverine, acetylcysteine, bromhexine, epinephrine, isoprenaline, orciprenaline, ephedrine, fenoterol, rimiterol, ipratropium, cholinetheophyllinate, proxiphylline, bechlomethasone, budesonide, deslanoside, digoxine, digitoxin, disopyramide, proscillaridin, chinidine, procainamide, mexiletin, flecainide, alprenolol, proproan
- a conjugate may include a hormonal drug which may be peptidic or non-peptidic, e.g., adrenaline, noradrenaline, angiotensin, atriopeptin, aldosterone, dehydroepiandrosterone, androstenedione, testosterone, dihydrotestosterone, calcitonin, calcitriol, calcidiol, corticotropin, Cortisol, dopamine, estradiol, estrone, estriol, erythropoietin, follicle-stimulating hormone, gastrin, ghrelin, glucagon, gonadotropin-releasing hormone, growth hormone, growth hormone-releasing hormone, human chorionic gonadotropin, histamine, human placental lactogen, insulin, insulin-like growth factor, inhibin, leptin, a leukotriene, lipotropin, melatonin, orexin, oxytocin, parathyroid hormone,
- the hormone may be selected from glucagon, insulin, insulin-like growth factor, leptin, thyroid- stimulating hormone, thyrotropin-releasing hormone (or thyrotropin), thyrotropin-releasing hormone, thyroxine, and triiodothyronine.
- the drug is insulin-like growth factor 1 (IGF-I). It is to be understood that this list is intended to be exemplary and that any hormonal drug, whether known or later discovered, may be used in a conjugate of the present disclosure.
- a conjugate may include a thyroid hormone.
- a conjugate may include an anti-diabetic drug (i.e., a drug which has a beneficial effect on patients suffering from diabetes).
- an anti-diabetic drug i.e., a drug which has a beneficial effect on patients suffering from diabetes.
- a conjugate may include an insulin molecule.
- insulin or "insulin molecule” encompasses all salt and non-salt forms of the insulin molecule. It will be appreciated that the salt form may be anionic or cationic depending on the insulin molecule.
- insulin or “an insulin molecule” we intend to encompass both wild-type and modified forms of insulin as long as they are bioactive (i.e., capable of causing a detectable reduction in glucose when administered in vivo).
- Wild-type insulin includes insulin from any species whether in purified, synthetic or recombinant form (e.g., human insulin, porcine insulin, bovine insulin, rabbit insulin, sheep insulin, etc.).
- Modified forms of insulin may be chemically modified (e.g., by addition of a chemical moiety such as a PEG group or a fatty acyl chain as described below) and/or mutated (i.e., by addition, deletion or substitution of one or more amino acids).
- an insulin molecule of the present disclosure will differ from a wild-type insulin by 1-10 (e.g., 1-9, 1-8, 1-7, 1-6, 1-5, 1-4, 1-3, 1-2, 2-9, 2-8, 2-7, 2-6, 2-5, 2-4, 2-3, 3-9, 3-8, 3-7, 3-6, 3-5, 3-4, 4-9, 4-8, 4-7, 4-6, 4-5, 5-9, 5-8, 5-7, 5-6, 6-9, 6-8, 6-7, 7-9, 7-8, 8-9, 9, 8, 7, 6, 5, 4, 3, 2 or 1) amino acid substitutions, additions and/or deletions.
- an insulin molecule of the present disclosure will differ from a wild-type insulin by amino acid substitutions only.
- an insulin molecule of the present disclosure will differ from a wild-type insulin by amino acid additions only. In certain embodiments, an insulin molecule of the present disclosure will differ from a wild-type insulin by both amino acid substitutions and additions. In certain embodiments, an insulin molecule of the present disclosure will differ from a wild-type insulin by both amino acid substitutions and deletions.
- amino acid substitutions may be made on the basis of similarity in polarity, charge, solubility, hydrophobicity, hydrophilicity, and/or the amphipathic nature of the residues involved.
- a substitution may be conservative, that is, one amino acid is replaced with one of similar shape and charge.
- Conservative substitutions are well known in the art and typically include substitutions within the following groups: glycine, alanine; valine, isoleucine, leucine; aspartic acid, glutamic acid; asparagine, glutamine; serine, threonine; lysine, arginine; and tyrosine, phenylalanine.
- the hydrophobic index of amino acids may be considered in choosing suitable mutations.
- the importance of the hydrophobic amino acid index in conferring interactive biological function on a polypeptide is generally understood in the art.
- the substitution of like amino acids can be made effectively on the basis of hydrophilicity.
- the importance of hydrophilicity in conferring interactive biological function of a polypeptide is generally understood in the art.
- the use of the hydrophobic index or hydrophilicity in designing polypeptides is further discussed in U.S. Patent No. 5,691,198.
- A-Chain (SEQ ID NO:1): GIVEQCCTSICSLYQLENYCN
- B-Chain (SEQ ID NO:2): FVNQHLCGSHL VEALYL VCGERGFFYTPKT
- Human insulin differs from rabbit, porcine, bovine, and sheep insulin only in amino acids A8, A9, AlO, and B30 (see table below).
- an insulin molecule of the present disclosure is mutated at the B28 and/or B29 positions of the B-peptide sequence.
- insulin lispro (HUMALOG®) is a rapid acting insulin mutant in which the penultimate lysine and proline residues on the C-terminal end of the B-peptide have been reversed (Lys B28 Pro B29 -human insulin). This modification blocks the formation of insulin multimers.
- Insulin aspart is another rapid acting insulin mutant in which proline at position B28 has been substituted with aspartic acid (Asp B28 -human insulin). This mutant also prevents the formation of multimers.
- mutation at positions B28 and/or B29 is accompanied by one or more mutations elsewhere in the insulin polypeptide.
- insulin glulisine AIDRA®
- AIDRA® insulin glulisine
- APIDRA® is yet another rapid acting insulin mutant in which aspartic acid at position B3 has been replaced by a lysine residue and lysine at position B29 has been replaced with a glutamic acid residue (Lys B3 Glu B29 -human insulin).
- an insulin molecule of the present disclosure has an isoelectric point that is shifted relative to human insulin.
- the shift in isoelectric point is achieved by adding one or more arginine residues to the N-terminus of the insulin A-peptide and/or the C-terminus of the insulin B- peptide.
- insulin polypeptides include Arg A0 -human insulin, Arg B31 Arg B32 -human insulin, Gly A21 Arg B31 Arg B32 -human insulin,
- an insulin molecule of the present disclosure comprises an A-peptide sequence wherein A21 is GIy and B-peptide sequence wherein B31 and B32 are Arg-Arg.
- an insulin molecule of the present disclosure is truncated.
- a B-peptide sequence of an insulin polypeptide of the present disclosure is missing Bl, B2, B3, B26, B27, B28, B29 and/or B30.
- combinations of residues are missing from the B-peptide sequence of an insulin polypeptide of the present disclosure.
- the B-peptide sequence may be missing residues B(I -2), B(l-3), B(29-30), B(28-30), B(27-30) and/or B(26-30).
- these deletions and/or truncations apply to any of the aforementioned insulin molecules (e.g., without limitation to produce des(B30)-insulin lispro, des(B30)-insulin aspart, des(B30)-insulin glulisine, des(B30)-insulin glargine, etc.).
- an insulin molecule contains additional amino acid residues on the
- one or more amino acid residues are located at positions AO, A21, BO and/or B31. In some embodiments, one or more amino acid residues are located at position AO. In some embodiments, one or more amino acid residues are located at position A21. In some embodiments, one or more amino acid residues are located at position BO. In some embodiments, one or more amino acid residues are located at position B31. In certain embodiments, an insulin molecule does not include any additional amino acid residues at positions AO, A21, BO or B31.
- an insulin molecule of the present disclosure is mutated such that one or more amidated amino acids are replaced with acidic forms.
- asparagine may be replaced with aspartic acid or glutamic acid.
- glutamine may be replaced with aspartic acid or glutamic acid.
- Asn A18 , Asn A21 , or Asn B3 may be replaced by aspartic acid or glutamic acid.
- Gln A15 or Gln B4 may be replaced by aspartic acid or glutamic acid.
- an insulin molecule has aspartic acid at position A21 or aspartic acid at position B3, or both.
- an insulin molecule of the present disclosure has a protracted profile of action.
- an insulin molecule of the present disclosure may be acylated with a fatty acid. That is, an amide bond is formed between an amino group on the insulin molecule and the carboxylic acid group of the fatty acid.
- the amino group may be the alpha-amino group of an N-terminal amino acid of the insulin molecule, or may be the epsilon-amino group of a lysine residue of the insulin molecule.
- an insulin molecule of the present disclosure may be acylated at one or more of the three amino groups that are present in wild-type human insulin or may be acylated on lysine residue that has been introduced into the wild-type human insulin sequence.
- an insulin molecule may be acylated at position Bl .
- an insulin molecule may be acylated at position B29.
- the fatty acid is selected from myristic acid (C 14), pentadecylic acid (C 15), palmitic acid (C 16), heptadecylic acid (C 17) and stearic acid (C 18).
- insulin detemir LEVEMIR®
- the N-terminus of the A-peptide, the N-terminus of the B-peptide, the epsilon-amino group of Lys at position B29 or any other available amino group in an insulin molecule of the present disclosure is covalently linked to a fatty acid moiety of general formula: wherein R F is hydrogen or a Ci_ 3 o alkyl group. In some embodiments, R F is a Ci_ 2 o alkyl group, a C 3-19 alkyl group, a C 5-18 alkyl group, a C 6-17 alkyl group, a C 8-16 alkyl group, a C 10-15 alkyl group, or a C 12-14 alkyl group.
- the insulin polypeptide is conjugated to the moiety at the Al position. In certain embodiments, the insulin polypeptide is conjugated to the moiety at the Bl position. In certain embodiments, the insulin polypeptide is conjugated to the moiety at the epsilon-amino group of Lys at position B29. In certain embodiments, position B28 of the insulin molecule is Lys and the epsilon-amino group of Lys B28 is conjugated to the fatty acid moiety. In certain embodiments, position B3 of the insulin molecule is Lys and the epsilon- amino group of Lys B3 is conjugated to the fatty acid moiety. In some embodiments, the fatty acid chain is 8-20 carbons long.
- the fatty acid is octanoic acid (C8), nonanoic acid (C9), decanoic acid (ClO), undecanoic acid (Cl 1), dodecanoic acid (C 12), or tridecanoic acid (C13).
- the fatty acid is myristic acid (C 14), pentadecanoic acid (C 15), palmitic acid (C 16), heptadecanoic acid (C 17), stearic acid (C 18), nonadecanoic acid (C 19), or arachidic acid (C20).
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: Lys B28 Pro B29 -human insulin (insulin lispro), Asp B28 -human insulin (insulin aspart), Lys B3 Glu B29 - human insulin (insulin glulisine), Arg B31 Arg B32 -human insulin (insulin glargine), N ⁇ B29 - myristoyl-des(B30)-human insulin (insulin detemir), Ala B26 -human insulin, Asp B1 -human insulin, Arg A0 -human insulin, Asp B1 Glu B13 -human insulin, Gly A21 -human insulin, Gly A21 Arg B31 Arg B32 -human insulin, Arg A0 Arg B31 Arg B32 -human insulin, Arg A0 Gly A21 Arg B31 Arg B32 -human insulin, des(B30)-human insulin, des(B30)-human insulin, des(B30
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - palmitoyl-human insulin, N ⁇ B29 -myrisotyl-human insulin, N ⁇ B28 -palmitoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -myristoyl-Lys B28 Pro B29 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - palmitoyl-des(B30)-human insulin, N ⁇ B30 -myristoyl-Thr B29 Lys B30 -human insulin, N ⁇ B30 - palmitoyl-Thr B29 Lys B30 -human insulin, N ⁇ B29 -(N-palmitoyl- ⁇ -glutamyl)-des(B30)-human insulin, N ⁇ B29 -(N-lithocolyl- ⁇ -glutamyl)-des(B30)-human insulin, N ⁇ B29 -( ⁇ -carboxyheptadecanoyl)- des(B30)-human insulin, N ⁇ B29 -( ⁇ -carboxyheptadecanoyl)- human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - octanoyl-human insulin, N ⁇ B29 -myristoyl-Gly A2 J Arg B3 J Arg B3 * -human insulin, N ⁇ B29 -myristoyl- Gly A21 Gln B3 Arg B31 Arg B32 -human insulin, N ⁇ B29 -myristoyl-Arg A0 Gly A21 Arg B31 Arg B32 -human insulin, N ⁇ B29 -Arg A0 Gly A21 Gln B3 Arg B31 Arg B32 -human insulin, N ⁇ B29 -myristoyl- Arg A0 Gly A21 Asp B3 Arg B31 Arg B32 -human insulin, N ⁇ B29 -myristoyl-Arg B31 Arg B32 -human insulin, N ⁇ B29 -myristoyl-Arg A0 Gly A21
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin polypeptides: N ⁇ B28 - myristoyl-Gly A21 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -myristoyl- Gly A21 Gln B3 Lys B28 Pro B30 Arg B31 Arg B32 -human insulin, N ⁇ B28 -myristoyl- Arg A0 Gly A21 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -myristoyl- Arg A0 Gly A21 Gln B3 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -myristoyl- Arg A0 Gly A21 Asp B3 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -myristoyl- Arg A0 Gly A21
- Lys B28 Pro B29 Arg B31 Arg B32 -human insulin N ⁇ B28 -myristoyl-arg A0 Lys B28 Pro B29 Arg B31 Arg B32 - human insulin, N ⁇ B28 -octanoyl-Gly A21 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - octanoyl-Gly A21 Gln B3 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -octanoyl- Arg A0 Gly A21 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -octanoyl- Arg A0 Gly A21 Gln B3 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -octanoyl- Arg A0 Gly A21 Asp B3 Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -octanoyl- Lys B28 Pro B29 Arg B31 Arg B32 -human insulin, N ⁇ B28 -octan
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-des(B30)-human insulin, N ⁇ B29 -tetradecanoyl-des(B30)-human insulin, N ⁇ B29 - decanoyl-des(B30)-human insulin, N ⁇ B29 -dodecanoyl-des(B30)-human insulin, N ⁇ B29 -tridecanoyl- Gly A21 -des(B30)-human insulin, N ⁇ B29 -tetradecanoyl-Gly A21 -des(B30)-human insulin, N ⁇ B29 - decanoyl-Gly A21 -des(B30)-human insulin, N ⁇ B29 -dodecanoyl-Gly A21 -des(B30)-human insulin, N ⁇ B29 -tridecanoyl-G
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-Gly A21 -human insulin, N ⁇ B29 -tetradecanoyl-Gly A21 -human insulin, N ⁇ B29 -decanoyl- Gly A21 -human insulin, N ⁇ B29 -dodecanoyl-Gly A21 -human insulin, N ⁇ B29 -tridecanoyl-Ala A21 -human insulin, N ⁇ B29 -tetradecanoyl-Ala A21 -human insulin, N ⁇ B29 -decanoyl-Ala A21 -human insulin, N ⁇ B29 - dodecanoyl-Ala A21 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-Gly A21 Gln B3 -human insulin, N ⁇ B29 -tetradecanoyl-Gly A21 Gln B3 -human insulin, N ⁇ B29 - decanoyl-Gly A21 Gln B3 -human insulin, N ⁇ B29 -dodecanoyl-Gly A21 Gln B3 -human insulin, N ⁇ B29 - tridecanoyl-Ala A21 Gln B3 -human insulin, N ⁇ B29 -tetradecanoyl-Ala A21 Gln B3 -human insulin, N ⁇ B29 - decanoyl-Ala A21 Gln B3 -human insulin, N ⁇ B29 -dodecanoyl-Ala A21 Gln B3 -human insulin,
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-Gln B3 -human insulin, N ⁇ B29 -tetradecanoyl-Gln B3 -human insulin, N ⁇ B29 -decanoyl- Gln B3 -human insulin, N ⁇ B29 -dodecanoyl-Gln B3 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-Glu B30 -human insulin, N ⁇ B29 -tetradecanoyl-Glu B30 -human insulin, N ⁇ B29 -decanoyl- Glu B30 -human insulin, N ⁇ B29 -dodecanoyl-Glu B30 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-Gly A21 Glu B30 -human insulin, N ⁇ B29 -tetradecanoyl-Gly A21 Glu B30 -human insulin, N ⁇ B29 -decanoyl-Gly A21 Glu B30 -human insulin, N ⁇ B29 -dodecanoyl-Gly A21 Glu B30 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-Gly A21 Gln B3 Glu B30 -human insulin, N ⁇ B29 -tetradecanoyl-Gly A21 Gln B3 Glu B30 -human insulin, N ⁇ B29 -decanoyl-Gly A21 Gln B3 Glu B30 -human insulin, N ⁇ B29 -dodecanoyl-Gly A21 Gln B3 Glu B30 - human insulin, N ⁇ B29 -tridecanoyl-Ala A21 Glu B30 -human insulin, N ⁇ B29 -tetradecanoyl-Ala A21 Glu B30 - human insulin, N ⁇ B29 -decanoyl-Ala A21 Glu B30 -human insulin, N ⁇ B29 -dodecanoyl-Ala A21
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - tridecanoyl-Gln B3 Glu B30 -human insulin, N ⁇ B29 -tetradecanoyl-Gln B3 Glu B30 -human insulin, N ⁇ B29 - decanoyl-Gln B3 Glu B30 -human insulin, N ⁇ B29 -dodecanoyl-Gln B3 Glu B30 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - formyl-human insulin, N ⁇ B1 -formyl -human insulin, N ⁇ A1 -formyl-human insulin, N ⁇ B29 -formyl- N ⁇ B1 -formyl-human insulin, N ⁇ B29 -formyl-N ⁇ A1 -formyl-human insulin, N ⁇ -formyl-N ⁇ -formyl- human insulin, N ⁇ B29 -formyl-N ⁇ A1 -formyl-N ⁇ B1 -formyl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - acetyl-human insulin, N ⁇ B1 -acetyl-human insulin, N ⁇ A1 -acetyl-human insulin, N ⁇ B29 -acetyl- N ⁇ B1 - acetyl-human insulin, N ⁇ B29 -acetyl-N ⁇ A1 -acetyl-human insulin, N ⁇ A1 -acetyl-N ⁇ B1 -acetyl-human insulin, N ⁇ B29 -acetyl-N ⁇ A1 -acetyl- N ⁇ B1 -acetyl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - propionyl-human insulin, N ⁇ B1 -propionyl-human insulin, N ⁇ A1 -propionyl-human insulin, N ⁇ B29 - acetyl- N ⁇ B1 -propionyl-human insulin, N ⁇ B29 -propionyl- N ⁇ A1 -propionyl-human insulin, N ⁇ A1 - propionyl- N ⁇ B1 -propionyl-human insulin, N ⁇ B29 -propionyl-N ⁇ A1 -propionyl-N ⁇ B1 -propionyl- human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - butyryl-human insulin, N ⁇ B1 -butyryl-human insulin, N ⁇ A1 -butyryl-human insulin, N ⁇ B29 -butyryl- N ⁇ B1 -butyryl-human insulin, N ⁇ B29 -butyryl-N ⁇ A1 -butyryl-human insulin, N ⁇ A1 -butyryl-N ⁇ B1 - butyryl-human insulin, N ⁇ B29 -butyryl-N ⁇ A1 -butyryl-N ⁇ B1 -butyryl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - pentanoyl-human insulin, N ⁇ B1 -pentanoyl-human insulin, N ⁇ A1 -pentanoyl-human insulin, N ⁇ B29 - pentanoyl-N ⁇ B1 -pentanoyl-human insulin, N ⁇ B29 -pentanoyl-N ⁇ A1 -pentanoyl-human insulin, N ⁇ A1 - pentanoyl-N ⁇ B l -pentanoyl-human insulin, N ⁇ B29 -pentanoyl-N ⁇ A1 -pentanoyl-N ⁇ B l -pentanoyl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - hexanoyl-human insulin, N ⁇ B1 -hexanoyl-human insulin, N ⁇ A1 -hexanoyl-human insulin, N ⁇ B29 - hexanoyl-N ⁇ B1 -hexanoyl-human insulin, N ⁇ B29 -hexanoyl-N ⁇ A1 -hexanoyl-human insulin, N * ⁇ 1 - hexanoyl-N ⁇ B l -hexanoyl-human insulin, N ⁇ B29 -hexanoyl-N ⁇ A1 -hexanoyl-N ⁇ B l -hexanoyl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - heptanoyl-human insulin, N ⁇ B1 -heptanoyl-human insulin, N ⁇ A1 -heptanoyl-human insulin, N ⁇ B29 - heptanoyl-N ⁇ B1 -heptanoyl-human insulin, N ⁇ B29 -heptanoyl-N ⁇ A1 -heptanoyl-human insulin, N ⁇ A1 - heptanoyl-N ⁇ B l -heptanoyl-human insulin, N ⁇ B29 -heptanoyl-N ⁇ A1 -heptanoyl-N ⁇ B l -heptanoyl-human insulin, N ⁇ B29 -heptanoyl-N ⁇ A1 -heptanoyl-N ⁇ B l
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B1 - octanoyl-human insulin, N ⁇ A1 -octanoyl-human insulin, N ⁇ B29 -octanoyl-N ⁇ B1 -octanoyl-human insulin, N ⁇ B29 -octanoyl-N ⁇ A1 -octanoyl-human insulin, N ⁇ A1 -octanoyl-N ⁇ B1 -octanoyl-human insulin, N ⁇ B29 -octanoyl-N ⁇ A1 -octanoyl-N ⁇ B l -octanoyl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - nonanoyl-human insulin, N ⁇ B1 -nonanoyl-human insulin, N ⁇ A1 -nonanoyl-human insulin, N ⁇ B29 - nonanoyl-N ⁇ B1 -nonanoyl-human insulin, N ⁇ B29 -nonanoyl-N ⁇ A1 -nonanoyl-human insulin, N * ⁇ 1 - nonanoyl-N ⁇ B l -nonanoyl-human insulin, N ⁇ B29 -nonanoyl-N ⁇ A1 -nonanoyl-N ⁇ B l -nonanoyl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - decanoyl-human insulin, N ⁇ B1 -decanoyl-human insulin, N ⁇ A1 -decanoyl-human insulin, N ⁇ B29 - decanoyl-N ⁇ B1 -decanoyl-human insulin, N ⁇ B29 -decanoyl-N ⁇ A1 -decanoyl-human insulin, N ⁇ A1 - decanoyl-N ⁇ B l -decanoyl-human insulin, N ⁇ B29 -decanoyl-N ⁇ A1 -decanoyl-N ⁇ B l -decanoyl-human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - formyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -formyl-Lys B28 Pro B29 -human insulin, N ⁇ -formyl- Lys B28 Pro B29 -human insulin, N ⁇ B28 -formyl-N ⁇ B1 -formyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 - formyl-N ⁇ A1 -formyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -formyl-N ⁇ B1 -formyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -formyl-N ⁇ A1 -formyl-N ⁇ B1 -formyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -formyl-
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - acetyl-N ⁇ A1 -acetyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -acetyl-N ⁇ B1 -acetyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -acetyl-N ⁇ A1 -acetyl-N ⁇ B1 -acetyl-Lys B28 Pro B29 -human insulin.
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - propionyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -propionyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 - propionyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -propionyl-N ⁇ B1 -propionyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -propionyl-N ⁇ A1 -propionyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -propionyl-N ⁇ B1 - propionyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -propionyl-N ⁇ B1 - propionyl-Lys B28 Pro B29 -human insulin, N ⁇ B28
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - butyryl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -butyryl-Lys B28 Pro B29 -human insulin, N ⁇ -butyryl- Lys B28 Pro B29 -human insulin, N ⁇ B28 -butyryl-N ⁇ B1 -butyryl-Lys B28 Pro B29 -human insulin, N ⁇ B28 - butyryl-N ⁇ A1 -butyryl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -butyryl-N ⁇ B1 -butyryl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -butyryl-N ⁇ B1 -butyryl-Lys B28 Pro B29 - human insulin, N ⁇ B28 -butyryl-N ⁇ A1 -butyryl-
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - pentanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -pentanoyl-Lys B28 Pro B29 -human insulin, N * ⁇ 1 - pentanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -pentanoyl-N ⁇ B * -pentanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -pentanoyl-N ⁇ A1 -pentanoyl-Lys B28 Pro B29 -human insulin, N ⁇ -pentanoyl-N" 61 - pentanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -pentanoyl-N ⁇ A1 -pentanoyl-N
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - hexanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -hexanoyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 - hexanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -hexanoyl-N ⁇ B1 -hexanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -hexanoyl-N ⁇ A1 -hexanoyl-Lys B28 Pro B29 -human insulin, N ⁇ -hexanoyl-N" 61 - hexanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -hexanoyl-N ⁇ A1 -hexanoyl
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - heptanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -heptanoyl-Lys B28 Pro B29 -human insulin, N 1 ⁇ 1 - heptanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -heptanoyl-N ⁇ B1 -heptanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -heptanoyl-N ⁇ A1 -heptanoyl-Lys B28 Pro B29 -human insulin, N ⁇ -heptanoyl-N" 61 - heptanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -heptanoyl-N ⁇ A1 -heptanoyl
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - octanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -octanoyl-Lys B28 Pro B29 -human insulin, N 1 ⁇ 1 - octanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -octanoyl-N ⁇ B1 -octanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -octanoyl-N ⁇ A1 -octanoyl-Lys B28 Pro B29 -human insulin, N ⁇ octanoyl-N ⁇ octanoyl- Lys B28 Pro B29 -human insulin, N ⁇ B28 -octanoyl-N ⁇ A1 -oct
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - nonanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -nonanoyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 - nonanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -nonanoyl-N ⁇ B1 -nonanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -nonanoyl-N ⁇ A1 -nonanoyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -nonanoyl-N ⁇ B1 - nonanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -nonanoyl-N ⁇ A1 -nonanoyl-
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B28 - decanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B1 -decanoyl-Lys B28 Pro B29 -human insulin, N * ⁇ 1 - decanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -decanoyl-N ⁇ B1 -decanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -decanoyl-N ⁇ A1 -decanoyl-Lys B28 Pro B29 -human insulin, N ⁇ A1 -decanoyl-N ⁇ B1 - decanoyl-Lys B28 Pro B29 -human insulin, N ⁇ B28 -decanoyl-N ⁇ A1 -decanoyl-Lys B28 Pro B29
- an insulin molecule of the present disclosure comprises the mutations and/or chemical modifications of one of the following insulin molecules: N ⁇ B29 - pentanoyl-Gly A21 Arg B31 Arg B32 -human insulin, N ⁇ B1 -hexanoyl-Gly A21 Arg B31 Arg B32 -human insulin, N ⁇ A1 -heptanoyl-Gly A21 Arg B31 Arg B32 -human insulin, N ⁇ B29 -octanoyl- N ⁇ B1 -octanoyl- Gly A21 Arg B31 Arg B32 -human insulin, N ⁇ B29 -propionyl- N ⁇ A1 -propionyl-Gly A21 Arg B31 Arg B32 -human insulin, N ⁇ -acetyl- N ⁇ B1 -acetyl-Gly A21 Arg B31 Arg B32 -human insulin, N ⁇ B29 -
- the present disclosure also encompasses modified forms of non-human insulins (e.g., porcine insulin, bovine insulin, rabbit insulin, sheep insulin, etc.) that comprise any one of the aforementioned mutations and/or chemical modifications.
- non-human insulins e.g., porcine insulin, bovine insulin, rabbit insulin, sheep insulin, etc.
- an insulin molecule of the present disclosure includes the three wild-type disulfide bridges (i.e., one between position 7 of the A-chain and position 7 of the B- chain, a second between position 20 of the A-chain and position 19 of the B-chain, and a third between positions 6 and 11 of the A-chain).
- an insulin molecule is modified and/or mutated to reduce its affinity for the insulin receptor. Without wishing to be bound to a particular theory, it is believed that attenuating the receptor affinity of an insulin molecule through modification (e.g., acylation) or mutation may decrease the rate at which the insulin molecule is eliminated from serum. In some embodiments, a decreased insulin receptor affinity in vitro translates into a superior in vivo activity for an insulin conjugate. In certain embodiments, an insulin molecule is mutated such that the site of mutation is used as a conjugation point, and conjugation at the mutated site reduces binding to the insulin receptor (e.g., Lys A3 ).
- the insulin receptor e.g., Lys A3
- conjugation at an existing wild-type amino acid or terminus reduces binding to the insulin receptor (e.g., Gly A1 ).
- an insulin molecule is conjugated at position A4, A5, A8, A9, or B30.
- the conjugation at position A4, A5, A8, A9, or B30 takes place via a wild-type amino acid side chain (e.g., Glu A4 ).
- an insulin molecule is mutated at position A4, A5, A8, A9, or B30 to provide a site for conjugation (e.g., Lys A4 , Lys A5 , Lys A8 , Lys A9 , or Lys B30 ).
- an insulin molecule is conjugated to a ligand or conjugate framework via the Al amino acid residue.
- the Al amino acid residue is glycine. It is to be understood however, that the present disclosure is not limited to N-terminal conjugation and that in certain embodiments an insulin molecule may be conjugated via a non-terminal A-chain amino acid residue.
- the present disclosure encompasses conjugation via the epsilon-amine group of a lysine residue present at any position in the A-chain (wild-type or introduced by site-directed mutagenesis). It will be appreciated that different conjugation positions on the A-chain may lead to different reductions in insulin activity.
- an insulin molecule is conjugated to the conjugate framework via the B 1 amino acid residue.
- the Bl amino acid residue is phenylalanine. It is to be understood however, that the present disclosure is not limited to N-terminal conjugation and that in certain embodiments an insulin molecule may be conjugated via a non-terminal B-chain amino acid residue.
- the present disclosure encompasses conjugation via the epsilon-amine group of a lysine residue present at any position in the B-chain (wild-type or introduced by site-directed mutagenesis).
- an insulin molecule may be conjugated via the B29 lysine residue.
- conjugation to the at least one ligand via the B3 lysine residue may be employed. It will be appreciated that different conjugation positions on the B-chain may lead to different reductions in insulin activity.
- the ligands are conjugated to more than one conjugation point on a drug such as an insulin molecule.
- an insulin molecule can be conjugated at both the Al N-terminus and the B29 lysine.
- amide conjugation takes place in carbonate buffer to conjugate at the B29 and Al positions, but not at the Bl position.
- an insulin molecule can be conjugated at the Al N-terminus, the Bl N-terminus, and the B29 lysine.
- protecting groups are used such that conjugation takes place at the Bl and B29 or Bl and Al positions. It will be appreciated that any combination of conjugation points on an insulin molecule may be employed. In some embodiments, at least one of the conjugation points is a mutated lysine residue, e.g., Lys ⁇ .
- a conjugate may include an insulin sensitizer (i.e., a drug which potentiates the action of insulin).
- Drugs which potentiate the effects of insulin include biguanides (e.g., metformin) and glitazones.
- the first glitazone drug was troglitazone which turned out to have severe side effects.
- Second generation glitazones include pioglitazone and rosiglitazone which are better tolerated although rosiglitazone has been associated with adverse cardiovascular events in certain trials.
- a conjugate may include an insulin secretagogue (i.e., a drug which stimulates insulin secretion by beta cells of the pancreas).
- a conjugate may include a sulfonylurea.
- Sulfonylureas stimulate insulin secretion by beta cells of the pancreas by sensitizing them to the action of glucose. Sulfonylureas can, moreover, inhibit glucagon secretion and sensitize target tissues to the action of insulin.
- First generation sulfonylureas include tolbutamide, chlorpropamide and carbutamide.
- Second generation sulfonylureas which are active at lower doses include glipizide, glibenclamide, gliclazide, glibornuride and glimepiride.
- a conjugate may include a meglitinide.
- Suitable meglitinides include nateglinide, mitiglinide and repaglinide. Their hypoglycemic action is faster and shorter than that of sulfonylureas.
- Other insulin secretagogues include glucagon-like peptide 1 (GLP-I) and GLP-I analogs (i.e., a peptide with GLP-I like bioactivity that differs from GLP-I by 1-10 amino acid substitutions, additions or deletions and/or by a chemical modification).
- GLP-I reduces food intake by inhibiting gastric emptying, increasing satiety through central actions and by suppressing glucagon release.
- GLP-I lowers plasma glucose levels by increasing pancreas islet cell proliferation and increases insulin production following food consumption.
- GLP-I may be chemically modified, e.g., by lipid conjugation as in liraglutide to extend its in vivo half-life.
- insulin secretagogues include exendin-4 and exendin-4 analogs (i.e., a peptide with exendin-4 like bioactivity that differs from exendin-4 by 1-10 amino acid substitutions, additions or deletions and/or by a chemical modification).
- Exendin-4 found in the venom of the GiIa Monster, exhibits GLP-I like bioactivity. It has a much longer half- life than GLP-I and, unlike GLP-I, it can be truncated by 8 amino acid residues at its N-terminus without losing bioactivity.
- GLP-I and exendin-4 are almost identical, a significant difference being the second amino acid residue, alanine in GLP-I and glycine in exendin-4, which gives exendin-4 its resistance to in vivo digestion. Exendin-4 also has an extra 9 amino acid residues at its C-terminus as compared to GLP-I. Mann et al. Biochem. Soc. Trans. 35:713-716, 2007 and Runge et al., Biochemistry 46:5830-5840, 2007 describe a variety of GLP-I and exendin-4 analogs which may be used in a conjugate of the present disclosure.
- a conjugate may include amylin or an amylin analog (i.e., a peptide with amylin like bioactivity that differs from amylin by 1-10 amino acid substitutions, additions or deletions and/or by a chemical modification).
- Amylin plays an important role in glucose regulation (e.g., see Edelman and Weyer, Diabetes Technol. Ther. 4:175-189, 2002). Amylin is a neuroendocrine hormone that is co-secreted with insulin by the beta cells of the pancreas in response to food intake. While insulin works to regulate glucose disappearance from the bloodstream, amylin works to help regulate glucose appearance in the bloodstream from the stomach and liver.
- Pramlintide acetate SYMLIN®
- the strategy for designing pramlintide involved substituting certain residues with those from rat amylin, which is not amyloidogenic.
- proline residues are known to be structure-breaking residues, so these were directly grafted from the rat sequence into the human sequence.
- GIu- 10 was also substituted with an asparagine.
- a pre-conjugated drug may contain one or more reactive moieties (e.g., carboxyl or reactive ester, amine, hydroxyl, aldehyde, sulfhydryl, maleimidyl, alkynyl, azido, etc. moieties).
- reactive moieties e.g., carboxyl or reactive ester, amine, hydroxyl, aldehyde, sulfhydryl, maleimidyl, alkynyl, azido, etc. moieties.
- these reactive moieties may, in certain embodiments, facilitate the conjugation process.
- Specific examples include peptidic drugs bearing alpha-terminal amine and/or epsilon-amine lysine groups. It will be appreciated that any of these reactive moieties may be artificially added to a known drug if not already present.
- a suitable amino acid e.g., a lysine
- the conjugation process may be controlled by selectively blocking certain reactive moieties prior to conjugation.
- a conjugate of the present disclosure may be exploited to manipulate a natural feedback mechanism between glucose and insulin (where the level of insulin increases as the level of glucose increases and the level of glucose decreases as the level of insulin increases).
- the drug can be a molecule that (a) has the same function as insulin (e.g., reduces glucose levels), (b) stimulates the production of the insulin and/or (c) potentiates the effect(s) of insulin.
- insulin secretagogue or an insulin sensitizer instead of insulin as the drug.
- a conjugate can be used which includes a drug with a function that is not directly related to glucose.
- a conjugate which responds to glucose may be used to provide long-term, mealtime dosing of a drug. Any drug which needs to be dosed periodically and/or with food would benefit from such a delivery system.
- many traditional drugs need to be administered with food or at mealtimes. For example, drugs which inhibit the absorption of fats (e.g., orlistat) are advantageously present during mealtime.
- drugs which lower lipid levels e.g., lovastatin, atorvastatin, or simvastatin, or triglyceride levels, e.g., gemfibrozil, may also be advantageously released at mealtimes.
- a conjugate of the present disclosure comprises an insulin molecule conjugated to one or more ligands that are independently selected from the group consisting of aminoethylglucose (AEG), aminoethylmannose (AEM), aminoethylbimannose (AEBM), aminoethyltrimannose (AETM), ⁇ -aminoethyl-N-acetylglucosamine (AEGA), and aminoethylfucose (AEF).
- the insulin molecule is conjugated via the Al amino acid residue.
- the insulin molecule is conjugated via the Bl amino acid residue.
- the insulin molecule is conjugated via the epsilon- amino group of Lys B29 . In certain embodiments, the insulin molecule is insulin glulisine conjugated via the epsilon-amino group of Lys B3 .
- a conjugate of the present disclosure comprises an insulin molecule conjugated to one or more aminoethylglucose (AEG) ligands. In certain embodiments, a conjugate of the present disclosure comprises an insulin molecule conjugated to one or more aminoethylmannose (AEM) ligands. In certain embodiments, a conjugate of the present disclosure comprises an insulin molecule conjugated to one or more aminoethylbimannose
- a conjugate of the present disclosure comprises an insulin molecule conjugated to one or more aminoethyltrimannose (AETM) ligands.
- AETM aminoethyltrimannose
- a conjugate of the present disclosure comprises an insulin molecule conjugated to one or more ⁇ -aminoethyl-N-acetylglucosamine (AEGA) ligands.
- AEGA ⁇ -aminoethyl-N-acetylglucosamine
- a conjugate of the present disclosure comprises an insulin molecule conjugated to one or more aminoethylfucose (AEF) ligands.
- AEF aminoethylfucose
- a conjugate of the present disclosure comprises an insulin molecule conjugated to two or more separate ligands. In some embodiments, a conjugate of the present disclosure comprises an insulin molecule conjugated to two separate ligands. In other embodiments, a conjugate of the present disclosure comprises an insulin molecule conjugated to three separate ligands. In certain embodiments, a conjugate of the present disclosure comprises an insulin molecule conjugated to four separate ligands. In certain embodiments, the two or more separate ligands of such a conjugate are aminoethylglucose (AEG). In certain embodiments, the two or more separate ligands of such a conjugate are aminoethylmannose (AEM).
- AEG aminoethylglucose
- AEM aminoethylmannose
- the two or more separate ligands of such a conjugate are aminoethylbimannose (AEBM). In certain embodiments, the two or more separate ligands of such a conjugate are aminoethyltrimannose (AETM). In certain embodiments, the two or more separate ligands of such a conjugate are ⁇ -aminoethyl-N-acetylglucosamine (AEGA). In certain embodiments, the two or more separate ligands of such a conjugate are aminoethylfucose (AEF). In various embodiments, a conjugate of the present disclosure comprises two or more separate ligands conjugated to a single conjugate framework that is also conjugated to an insulin molecule.
- AEBM aminoethylbimannose
- AETM aminoethyltrimannose
- AEGA ⁇ -aminoethyl-N-acetylglucosamine
- AEF aminoethylfucose
- the two or more separate ligands and insulin molecule of such a conjugate are each located on a separate branch of a single branched conjugate framework. In some embodiments, the two or more separate ligands and insulin molecule of such a conjugate are each located on termini of separate branches of a single branched conjugate framework. In some embodiments, the two or more separate ligands of such a conjugate are conjugated to the insulin molecule via two or more different conjugation points. In certain such embodiments, the insulin molecule is conjugated via the Al amino acid residue and the epsilon-amino group of Lys B29 .
- the insulin molecule is conjugated to two separate conjugate frameworks that are each conjugated to one or more separate ligands. In other such embodiments, the insulin molecule is conjugated to two separate conjugate frameworks that are each conjugated to one ligand. In yet other such embodiments, the insulin molecule is conjugated to two separate branched conjugate frameworks that are each conjugated to two ligands. In certain such embodiments, the ligands are located on separate branches of the branched conjugate frameworks. In other such embodiments, the ligands are located on termini of separate branches of the branched conjugate frameworks.
- a conjugate of the present disclosure comprises an insulin molecule conjugated to aminoethylglucose (AEG).
- AEG aminoethylglucose
- the insulin molecule is conjugated via the Al amino acid residue.
- the insulin molecule is conjugated via the Bl amino acid residue.
- the insulin molecule is conjugated via the epsilon-amino group of Lys B29 .
- the insulin molecule is insulin glulisine conjugated via the epsilon-amino group of Lys B3 .
- the insulin molecule is conjugated via the Al amino acid residue and the epsilon-amino group of Lys B29 .
- a conjugate of the present disclosure comprises an insulin molecule conjugated to aminoethylmannose (AEM).
- AEM aminoethylmannose
- the insulin molecule is conjugated via the Al amino acid residue.
- the insulin molecule is conjugated via the Bl amino acid residue.
- the insulin molecule is conjugated via the epsilon-amino group of Lys B29 .
- the insulin molecule is insulin glulisine conjugated via the epsilon-amino group of Lys B3 .
- the insulin molecule is conjugated via the Al amino acid residue and the epsilon-amino group of Lys B29 .
- a conjugate of the present disclosure comprises an insulin molecule conjugated to aminoethylbimannose (AEBM).
- the insulin molecule is conjugated via the Al amino acid residue.
- the insulin molecule is conjugated via the Bl amino acid residue.
- the insulin molecule is conjugated via the epsilon-amino group of Lys B29 .
- the insulin molecule is insulin glulisine conjugated via the epsilon-amino group of Lys B3 .
- the insulin molecule is conjugated via the Al amino acid residue and the epsilon-amino group of Lys B29 .
- a conjugate of the present disclosure comprises an insulin molecule conjugated to aminoethyltrimannose (AETM).
- the insulin molecule is conjugated via the Al amino acid residue.
- the insulin molecule is conjugated via the Bl amino acid residue.
- the insulin molecule is conjugated via the epsilon-amino group of Lys B29 .
- the insulin molecule is insulin glulisine conjugated via the epsilon-amino group of Lys B3 .
- the insulin molecule is conjugated via the Al amino acid residue and the epsilon-amino group of Lys B29 .
- a conjugate of the present disclosure comprises an insulin molecule conjugated to ⁇ -aminoethyl-N-acetylglucosamine (AEGA).
- AEGA ⁇ -aminoethyl-N-acetylglucosamine
- the insulin molecule is conjugated via the Al amino acid residue.
- the insulin molecule is conjugated via the Bl amino acid residue.
- the insulin molecule is conjugated via the epsilon-amino group of Lys B29 .
- the insulin molecule is insulin glulisine conjugated via the epsilon- amino group of Lys B3 .
- the insulin molecule is conjugated via the Al amino acid residue and the epsilon-amino group of Lys B29 .
- a conjugate of the present disclosure comprises an insulin molecule conjugated to aminoethylfucose (AEF).
- AEF aminoethylfucose
- the insulin molecule is conjugated via the Al amino acid residue.
- the insulin molecule is conjugated via the Bl amino acid residue.
- the insulin molecule is conjugated via the epsilon-amino group of Lys B29 .
- the insulin molecule is insulin glulisine conjugated via the epsilon-amino group of Lys B3 .
- the insulin molecule is conjugated via the Al amino acid residue and the epsilon-amino group of Lys B29 . Conjugate frameworks
- a conjugate of the present disclosure may have the general formula (I):
- each occurrence of represents a potential branch within the conjugate
- each occurrence of represents a potential repeat within a branch of the conjugate; each occurrence of I — I is independently a covalent bond, a carbon atom, a heteroatom, or an optionally substituted group selected from the group consisting of acyl, aliphatic, heteroaliphatic, aryl, heteroaryl, and heterocyclic; each occurrence of T is independently a covalent bond or a bivalent, straight or branched, saturated or unsaturated, optionally substituted Ci_ 3 o hydrocarbon chain wherein one or more methylene units of T are optionally and independently replaced by -O-, -S-, -N(R)-, -C(O)-, -C(O)O-, -OC(O)-, -N(R)C(O)-, -C(O)N(R)-, -S(O)-, -S(O) 2 -, -N(R)SO 2 -,
- each occurrence of R is independently hydrogen, a suitable protecting group, or an acyl moiety, arylalkyl moiety, aliphatic moiety, aryl moiety, heteroaryl moiety, or heteroaliphatic moiety;
- -B is -T-L B -X; each occurrence of X is independently a ligand; each occurrence of L B is independently a covalent bond or a group derived from the covalent conjugation of a T with an X;
- k is an integer from 1 to 12, inclusive;
- each occurrence of I — I represents a potential branching node and that the number of branches at each node are determined by the values of k for the central I — I and n for non-central occurrences of I — I .
- n may be an integer from 0 to 5
- the present disclosure contemplates linear, branched, and hyperbranched (e.g., dendrimer-like) embodiments of these conjugates.
- the proviso which requires that within each k-branch at least one occurrence of n is > 1 and at least one occurrence of v is > 1 ensures that every conjugate includes at least one occurrence of B (i.e., a ligand).
- each occurrence of I — I in a p-bracketed moiety is substituted by a number of n-bracketed moieties corresponding to a value of n > 1.
- the conjugate may be of the formula (Ia):
- the conjugate may be of the formula (Ib):
- each occurrence of I — I in an m-bracketed moiety is substituted by a number of B moieties corresponding to the value of v > 1.
- the conjugate may be of the formula (Ic):
- the conjugate may be of the formula (Ie):
- the conjugate may be of the formula (If):
- the present disclosure also provides conjugates which include ligands and/or a drug which is non-covalently bound to a conjugate framework.
- the present disclosure provides conjugates of any of the foregoing formulas, wherein:
- each of I — I , T, D, k, q, p, n, m and v is defined as described above and herein;
- -B is -T-LRP B -X;
- each occurrence of X is independently a ligand;
- each occurrence of LRP B is independently a ligand-receptor pair which forms a non-covalent bond between T and X with a dissociation constant in human serum of less than 1 pmol/L.
- each of I — I , T, B, k, q, p, n, m and v is defined as described above and herein;
- -D is -T-LRP D -W;
- each occurrence of W is independently a drug;
- each occurrence of LRP D is independently a ligand-receptor pair which forms a non-covalent bond between T and W with a dissociation constant in human serum of less than 1 pmol/L.
- the present disclosure provides conjugates of any of the foregoing formulas wherein: each of I — I , T, k, q, p, n, m and v is defined as described above and herein;
- -B is -T-LRP B -X; each occurrence of X is independently a ligand; each occurrence of LRP B is independently a ligand-receptor pair which forms a non-covalent bond between T and X with a dissociation constant in human serum of less than 1 pmol/L;
- -D is -T-LRP D -W; each occurrence of W is independently a drug; and each occurrence of LRP D is independently a ligand-receptor pair which forms a non-covalent bond between T and W with a dissociation constant in human serum of less than 1 pmol/L.
- a conjugate of the present disclosure may have the general formula (II):
- Conjugates of formula (II) may have multiple sites of conjugation of ligand to drug (i.e., where two or more ligands are conjugated to a single drug molecule via different sites on the drug, e.g., different amino acids in a biomolecular drug). It will be appreciated that, when q is 1, the subgenera described above (i.e., formulae (Ia)-(If)) apply to conjugates of formula (II) when j is 1. Likewise, similar subgenera can be contemplated by one skilled in the art for conjugates wherein j is 2, 3, or 4.
- each occurrence of L ⁇ -I is independently an optionally substituted group selected from the group consisting of acyl, aliphatic, heteroaliphatic, aryl, heteroaryl, and heterocyclic. In some embodiments, each occurrence of L ⁇ -I is the same.
- the central I — I is different from all other occurrences of ' — L In certain embodiments, the central I — I is different from all other occurrences of ' — L In certain
- L ⁇ -I is an optionally substituted aryl or heteroaryl group.
- ' — ' is 6-membered aryl.
- I — I is phenyl.
- ' — ' is a heteroatom selected from N, O, or S.
- L ⁇ J is nitrogen atom.
- L-J-I is an oxygen atom.
- ' — ' is sulfur atom.
- I — I is a carbon atom.
- each occurrence of T is independently a bivalent, straight or branched, saturated or unsaturated, optionally substituted C 1-20 hydrocarbon chain wherein one or more methylene units of T are optionally and independently replaced by -O-, -S-, -N(R)-, -C(O)-, -C(O)O-, -OC(O)-, -N(R)C(O)-, -C(O)N(R)-, -S(O)-, -S(O) 2 -, -N(R)SO 2 -, -SO 2 N(R)-, a heterocyclic group, an aryl group, or a heteroaryl group.
- T is constructed from a C 1-10 , C 1-8 , C 1-6 , C 1-4 , C 2-12 , C 4-12 , C 6-12 , C 8-12 , or C 10-12 hydrocarbon chain wherein one or more methylene units of T are optionally and independently replaced by -0-, -S-, -N(R)-, -C(O)-, -C(O)O-, -OC(O)-, -N(R)C(O)-, -C(O)N(R)-, -S(O)-, - S(O) 2 -, -N(R)SO 2 -, -SO 2 N(R)-, a heterocyclic group, an aryl group, or a heteroaryl group.
- one or more methylene units of T is replaced by a heterocyclic group. In some embodiments, one or more methylene units of T is replaced by a triazole moiety. In certain embodiments, one or more methylene units of T is replaced by -C(O)-. In certain embodiments, one or more methylene units of T is replaced by -C(O)N(R)-. In certain embodiments, one or more methylene units of T is replaced by -O-.
- each occurrence of T is the same.
- each occurrence of T (outside groups B and D) is a covalent bond and the conjugate is of the general formula (IV) or (V):
- I — ' , B, D, v, m, n, p, k, and j are as defined and described herein.
- the present disclosure provides conjugates of general formula (Via):
- the present disclosure provides conjugates of formula:
- the present disclosure provides conjugates of general formula (VIb):
- the present disclosure provides conjugates of formula:
- the present disclosure provides conjugates of formula:
- the present disclosure provides conjugates of general formula (VIc):
- the present disclosure provides conjugates of formula:
- the present disclosure provides conjugates of formula:
- the present disclosure provides conjugates of formula: wherein W, X, and j are as defined and described herein.
- a conjugate of the present disclosure may have the general formula
- I — ' , T, D, v, m, and n are as defined and described for conjugates of formula (I), and B is -T-L B -X, wherein each occurrence of X is independently a ligand that includes a saccharide.
- the present disclosure provides conjugates of formula:
- the conjugate scaffold is not of formula (I) or (II), but instead is a macrocycle.
- the macrocycle is a polyamine macrocycle.
- a conjugate of the present disclosure may have the general formula (IX):
- D is as defined and described for conjugates of formula (I), and B is -T-L B -X, wherein each occurrence of X is independently a ligand that includes a saccharide.
- -B is -T-L B -X where X is a ligand and L B is a covalent bond or a group derived from the covalent conjugation of an X with a T.
- X is a ligand
- L B is a covalent bond or a group derived from the covalent conjugation of an X with a T.
- -D is -T-L D -W where W is a drug and L D is a covalent bond or a group derived from the covalent conjugation of a W with a T.
- W is a drug
- L D is a covalent bond or a group derived from the covalent conjugation of a W with a T.
- Exemplary drugs were described above.
- conjugation chemistries may be used to covalently conjugate an X with a T and/or a W with a T (generally "components"). Such techniques are widely known in the art, and exemplary techniques are discussed below. Components can be directly bonded (i.e., with no intervening chemical groups) or indirectly bonded through a spacer (e.g., a coupling agent or covalent chain that provides some physical separation between the conjugated element and the remainder of the conjugate framework). It is to be understood that components may be covalently bound to a conjugate framework through any number of chemical bonds, including but not limited to amide, amine, ester, ether, thioether, isourea, imine, etc.
- L B and/or L D (generally "L" for the purposes of this section) is a covalent bond.
- L is an optionally substituted moiety derived from conjugating an optionally substituted carbonyl-reactive, thiol-reactive, amine- reactive, or hydroxyl-reactive moiety of T with a carboxyl, thiol, amine, or hydroxyl group of X or W.
- L is an optionally substituted moiety derived from conjugating an optionally substituted carboxyl-reactive, thiol-reactive, amine-reactive, or hydroxyl-reactive moiety of X or W with a carboxyl, thiol, amine, or hydroxyl group of T.
- L is .
- L is a succinimide moiety.
- components may be covalently bound to a conjugate framework using "click chemistry" reactions as is known in the art. These include, for example, cycloaddition reactions, nucleophilic ring-opening reactions, and additions to carbon-carbon multiple bonds (e.g., see KoIb and Sharpless, Drug Discovery Today 8:1128-1137, 2003 and references cited therein as well as Dondoni, Chem. Asian J. 2:700-708, 2007 and references cited therein). As discussed above, in various embodiments, the components may be bound to a conjugate framework via natural or chemically added pendant groups.
- first and second members of a pair of reactive groups can be present on either one of the component and framework (i.e., the relative location of the two members is irrelevant as long as they react to produce a conjugate).
- exemplary linkages are discussed in more detail below.
- carboxyl (or reactive ester) bearing components can be conjugated to -OH bearing frameworks (OBFs) using the procedure outlined by Kim et al., Biomaterials 24:4843-4851 (2003). Briefly, the OBF is dissolved in DMSO along with the carboxyl bearing component and reacted by means of N',N'-dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP) as catalysts under a dry atmosphere.
- DCC N',N'-dicyclohexylcarbodiimide
- DMAP 4-dimethylaminopyridine
- Carboxyl bearing components can be conjugated to -NH 2 bearing frameworks (NBFs) using a carbodiimide (EDAC) coupling procedure.
- the carboxyl bearing component is functionalized by reaction with EDAC in a pH 5 buffer followed by the addition of the NBF.
- the resulting products may be purified by any number of means available to those skilled in the art including, but not limited to, size exclusion chromatography, reversed phase chromatography, silica gel chromatography, ion exchange chromatography, ultrafiltration, and selective precipitation.
- amine bearing components can be coupled to -COOH bearing frameworks (CBFs).
- CBFs using activated ester moieties (e.g., see Hermanson in Bioconjugate Techniques, 2 nd edition, Academic Press, 2008 and references cited therein). Briefly, a CBF with terminal activated carboxylic acid esters such as -NHS, -SSC, -NPC, etc. is dissolved in an anhydrous organic solvent such as DMSO or DMF. The desired number of equivalents of amine bearing component are then added and mixed for several hours at room temperature. Amine bearing components can also be conjugated to CBFs to produce a stable amide bond as described by Baudys et al., Bioconj. Chem.
- This reaction can be achieved by adding tributylamine (TBA) and isobutylchloro formate to a solution of the CBF and an amine bearing component in dimethylsulfoxide (DMSO) under anhydrous conditions.
- TSA tributylamine
- DMSO dimethylsulfoxide
- Amine bearing components can alternatively be coupled to OBFs through cyanalation using reagents including, but not limited to, cyanogen bromide (CNBr), N-cyanotriethylammonium tetrafluoroborate (CTEA), l-Cyano-4-(Dimethylamino)-pyridinium tetrafluorborate (CDAP), and p- nitrophenylcyanate (pNPC).
- CNBr cyanogen bromide
- CTEA N-cyanotriethylammonium tetrafluoroborate
- CDAP l-Cyano-4-(Dimethylamino
- CNBr reactions can be carried out at mildly basic pH in aqueous solution.
- CDAP reactions are carried out in a mixture of DMSO and water at mildly basic pH using triethylamine (TEA) as a catalyst.
- amine bearing components can be conjugated to NBFs, e.g., through glutaraldehyde coupling in aqueous buffered solutions containing pyridine followed by quenching with glycine.
- amine bearing components can be conjugated to aldehyde bearing frameworks using a Schiff Base coupling procedure followed by reduction (e.g., see see Hermanson in Bioconjugate Techniques, 2 nd edition, Academic Press, 2008 and references cited therein as well as Mei et al. in Pharm. Res. 16: 1680-1686, 1999 and references cited therein).
- a framework with terminal activated aldehydes e.g., acetaldehyde, propionaldehyde, butyraldehyde, etc.
- an aqueous buffer with the pH at or below neutral to prevent unwanted aldehyde hydrolysis.
- an amine bearing component is then added and mixed at room temperature followed by addition of an excess of suitable reducing agent (e.g., sodium borohydride, sodium cyanobrohydride, sodium triacetoxyborohydride pyridine borane, triethylamine borane, etc.).
- suitable reducing agent e.g., sodium borohydride, sodium cyanobrohydride, sodium triacetoxyborohydride pyridine borane, triethylamine borane, etc.
- hydroxyl bearing components can be conjugated to OBFs according to the divinylsulfone (DVS) procedure. Using this procedure, the OBF is added to a pH 11.4 bicarbonate buffer and activated with DVS followed by addition of a hydroxyl bearing component after which glycine is added to neutralize and quench the reaction. Hydroxyl bearing components may also be coupled to OBFs using activated ester moieties as described above to produce ester bonds.
- DVS divinylsulfone
- sulfhydryl bearing components can be coupled to maleimide bearing frameworks (MBFs) using a relatively mild procedure to produce thioether bonds (e.g., see Hermanson in Bioconjugate Techniques, 2 nd edition, Academic Press, 2008 and references cited therein). Because the maleimide group is much less susceptible to hydrolysis than activated esters, the reaction can be carried out under aqueous conditions. Briefly, an MBF is dissolved in a buffered aqueous solution at pH 6.5-7.5 followed by the desired number of equivalents of sulfhydryl bearing component. After mixing at room temperature for several hours, the thioether coupled conjugate may be purified.
- MBFs maleimide bearing frameworks
- Sulfhydryl bearing components can also be conjugated to NBFs according to a method described by Thoma et al., J. Am. Chem. Soc. 121 :5919-5929, 1999. This reaction involves suspending the NBF in anhydrous dimethylformamide (DMF) followed by the addition of 2,6-lutidine and acid anhydride and subsequent purification of the reactive intermediate. A sulfhydryl bearing component is then added to a solution of the intermediate in DMF with triethylamine.
- DMF dimethylformamide
- azide bearing components can be coupled to an alkyne bearing framework (ABF) using the copper(I)-catalyzed modern version of the Huisgen-type azide- alkyne cycloaddition to give a 1 ,4-di-substituted 1,2,3-triazole (e.g., see Dondoni, Chem. Asian J. 2:700 - 708, 2007 and references cited therein as well as Dedola et al., Org. Biomol. Chem. 5: 1006-1017, 2007).
- ABSF alkyne bearing framework
- This reaction may be carried out for example in neat THF using N,N-diisopropylethylamine and Cu(PPhS) 3 Br as the catalyst system (e.g., see Wu et al., Chem. Commun. 5775-5777, 2005).
- the reaction may also be carried out in a 3:1 (THF:water) mixture using sodium ascorbate and CuSO 4 -SH 2 O as the catalyst system (e.g., see Wu et al., supra).
- the azide bearing component is added to the ABF at the desired number of equivalents followed by mixing for 12-48 hours at room temperature.
- alkyne bearing components may be conjugated to an azide bearing framework using exactly the same conditions described above.
- Certain components may naturally possess more than one of the same chemically reactive moiety.
- the N-terminal ⁇ -Phe-Bl is a preferred site of attachment over the N-terminal ⁇ -Gly-Al and ⁇ -Lys-B29 to preserve insulin bioactivity (e.g., see Mei et al., Pharm. Res. 16: 1680-1686, 1999 and references cited therein as well as Tsai et al., J. Pharm. Sci. 86: 1264-1268, 1997).
- the component e.g., insulin
- the component e.g., insulin
- the component e.g., insulin
- selective protection of insulin amine groups available in the literature including those that may be deprotected under acidic (BOC), slightly acidic (citraconic anhydride), and basic (MSC) conditions (e.g., see Tsai et al., J. Pharm. Sci. 86: 1264-1268, 1997; Dixon et al., Biochem. J.
- the GIy-Al and Lys-B29 amines may be selectively protected with tert-butoxycarbonyl (BOC) groups which are then removed after conjugation by incubation for one hour at 4 C in a 90% trifluoroacetic acid (TFA)/10% anisole solution.
- BOC tert-butoxycarbonyl
- TFA 90% trifluoroacetic acid
- a dry powder of insulin is dissolved in anhydrous DMSO followed by an excess of triethylamine.
- the dissociation constant (K d ) of the non-covalent linkage in human serum is less than 1 pmol/L.
- a component may be non-covalently bound to a conjugate framework via a non-covalent ligand-receptor pair as is well known in the art (e.g., without limitation a biotin-avidin based pair).
- one member of the ligand receptor-pair is covalently bound to the component while the other member of the pair is covalently bound to the conjugate framework.
- the strong non-covalent interaction between the ligand and its receptor causes the component to become non-covalently bound to the conjugate framework.
- Typical ligand/receptor pairs include protein/co -factor and enzyme/substrate pairs.
- biotin/avidin pair examples include without limitation, biotin/streptavidin, digoxigenin/anti-digoxigenin, FK506/FK506-binding protein (FKBP), rapamycin/FKBP, cyclophilin/cyclosporin and glutathione/glutathione transferase pairs.
- FKBP FK506/FK506-binding protein
- rapamycin/FKBP FK506/FK506-binding protein
- cyclophilin/cyclosporin glutathione/glutathione transferase pairs.
- Other suitable ligand/receptor pairs would be recognized by those skilled in the art, e.g., monoclonal antibodies paired with a epitope tag such as, without limitation, glutathione-S-transferase (GST), c-myc, FLAG® and further those described in Kessler pp. 105-152 of Advances in Mutagenesis" Ed.
- k and q k is an integer from 1 to 12, inclusive.
- k 1 to 6, e.g., 1, 2, or 3.
- q is an integer from 1 to 4, inclusive, and defines the number of D groups which are bound to the central I — I group.
- q 1.
- q 2.
- k + q is an integer from 2 to 6, inclusive.
- k + q 2, 3 or
- n is independently an integer from 0 to 5, inclusive, with the proviso that within each k-branch at least one occurrence of n is > 1. Branches within a given k-branch are referred to herein as n-branches.
- each occurrence of ' — ⁇ in a p-bracketed moiety is substituted by a number of n-bracketed moieties corresponding to a value of n > 1, e.g., see formula (Ia) above.
- each occurrence of n in the conjugate is the same.
- n 1 or 2.
- Each occurrence of v is independently an integer from 0 to 5, inclusive, with the proviso that within each k-branch at least one occurrence of v is > 1.
- each occurrence of I — I in an m-bracketed moiety is substituted by a number of B moieties corresponding to the value of v > 1, e.g., see formula (Ic) above.
- each occurrence of v in the conjugate is the same.
- v 1 or 2.
- only terminal occurrences of I — I in an m-bracketed moiety are substituted by a number of B moieties corresponding to a value of v > 1, e.g., see formula (Id) above.
- the amount of drug that is loaded onto a conjugate can be controlled by adjusting the molecular weight of the conjugate framework and/or the level of chemical activation (i.e., when pendant groups are added to the framework).
- the drug loading level may be in the range of 5 to 99% w/w of drug to conjugate. In various embodiments, loading levels within the narrower range of 50 to 99% may be used, e.g., in the range of 80 to 99%.
- conjugates e.g., ligand, drug, framework
- present disclosure encompasses conjugates that are comprised of any and all of the disclosed ligands, drugs and frameworks.
- the present disclosure provides reagents for preparing conjugates.
- a compound of general formula (I) wherein: each of I — I , T, D, k, q, k + q, p, n, m and v is defined as described above and herein; -B is -T-L B' ; and each occurrence of L B is independently hydrogen, an alkyne-containing moiety, an azide- containing moiety, or an optionally substituted carbonyl-reactive, thiol-reactive, amine- reactive, or hydroxyl-reactive moiety.
- I ⁇ I each of ⁇ — ⁇ , T, B, k, q, k + q, p, n, m and v is defined as described above and herein; -D is -T-L D' ; and each occurrence of L D is independently hydrogen, an alkyne-containing moiety, an azide- containing moiety, or an optionally substituted carbonyl-reactive, thiol-reactive, amine- reactive, or hydroxyl-reactive moiety.
- conjugates with two ligands per conjugation site and with short distances between all framework components may be prepared using tris(hydroxymethyl) aminomethane (Tris), tris-succinimidyl aminotriacetate (TSAT), tris-succinimidyl-1,3,5- benzenetricarboxylate (TSB), and benzene-1, 3, 5-tricarboxy-(N-4-butyric-NHS-ester)amide (TSB-C4) as conjugate frameworks.
- Tris tris(hydroxymethyl) aminomethane
- TSAT tris-succinimidyl aminotriacetate
- TTB tris-succinimidyl-1,3,5- benzenetricarboxylate
- TAB-C4 5-tricarboxy-(N-4-butyric-NHS-ester)amide
- succinimidyl (6-aminocaproyl)aminotriacetate TSAT-C6
- succinimidyl (6-amino(PEO- 6))aminotriacetate TSAT-PEO-6
- benzene- 1, 3, 5-tricarboxy-(N-6-aminocaproic-NHS ester)amide TSAT-C6
- benzene-1, 3, 5-tricarboxy-(N-10-aminodecanoic-NHS ester)amide TTB-ClO
- TSAT-C6 spacer arm chemistry imparts more hydrophobic character to the conjugate as compared to TSAT-PEO-6.
- both the ligand e.g., AEG, AEM, AEMB and AETM
- insulin may be reacted to a TSAT-C6 framework through the terminal activated esters to produce insulin-TSAT-C6-AEG-2, insulin-TSAT-C6-AEM-2, insulin-TSAT-C6-AEMB-2, and insulin-TSAT-C6-AETM-2 conjugates.
- the various ligands are synthesized ahead of time as discussed in the Examples.
- the Al and B29 amino groups of insulin are BOC-protected as described in the Examples so that each insulin can only react at the Phe-Bl ⁇ -amino group.
- the Bl and B29 amino groups of insulin are BOC-protected as described in the Examples so that each insulin can only react at the GIy-Al ⁇ -amino group.
- BOC-insulin as a 40-50 mg/ml solution in DMSO is added at room temperature to a 50 mg/ml solution of TSAT-C6 in DMSO containing excess triethylamine and allowed to react for approximately one hour.
- an excess of AEG, AEM, AEBM, and/or AETM (2-10 equivalents) as a 100 mg/ml solution in DMSO is added and allowed to react for an additional 2 hours.
- the DMSO solution is superdiluted by 1Ox into a pH 5 saline buffer after which the pH is adjusted to 8.0 and the solution passed through a Biogel P2 column to remove low molecular reactants and salts.
- the material eluting in the void fraction is concentrated using a 3K ultrafiltration apparatus after which it is injected on a prep scale reverse phase HPLC column (C 8, acetonitrile/water mobile phase containing 0.1% TFA) to purify the desired product from unreacted BOC2-insulin.
- the desired elution peak is collected pooled and rotovapped to remove acetonitrile followed by lyophilization to obtain a dry powder.
- the BOC protecting groups are removed by dissolving the lyophilized powder in 90% TF A/10% anisole for one hour at 4 C followed by 1Ox superdilution in HEPES pH 8.2 buffer containing 0.150 M NaCl.
- the pH is adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC, and any other contaminating salts.
- the deprotected, purified aqueous conjugate solution is then concentrated to the desired level and stored at 4 C until needed.
- reaction may take place at the B29 epsilon-amino group using unprotected insulin in carbonate buffer, since under those conditions the B29 amino group is the most reactive of the three amino groups present in wild-type insulin.
- the framework containing N-terminal activated esters is dissolved at 60 mM in anhydrous DMSO followed by the addition of triethylamine (TEA).
- the amine-bearing drug is then dissolved separately at 17.2 mM in sodium carbonate buffer (0.1 M, pH 11) and the pH subsequently adjusted to 10.8 with 1.0 N sodium hydroxide. Once dissolved, the entire framework/DMSO/ligand/TEA solution is added dropwise over the course of 75 minutes to the drug/carbonate buffer solution. During the addition, the pH of the resulting mixture is adjusted every 5 minutes to 10.8 if necessary using dilute HCl or NaOH. The solution is allowed to stir for an additional 15 minutes after the dropwise addition to ensure complete reaction.
- the resulting solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 40 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC. Once collected, the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate.
- A1,B29- disubstituted insulin-conjugates are synthesized using the conditions described above with approximately ten times the amount of multivalent active ester framework and ligand per insulin molecule compared to the B29-monosubstituted insulin-conjugate synthesis.
- B29-monosubstituted insulin-conjugates are synthesized using N- terminal protecting amino acid sequences using similar methods to those reported in U.S. Patent No. 7,402,565.
- N-terminal peptide sequences are engineered onto the insulin A- chain and B-chain such that the protecting amino acid sequences contain Arg A0 and Arg B0 to give an insulin intermediate.
- Conjugation takes places at Lys B29 on the insulin intermediate, while the N-termini are protected from conjugation side -products.
- the conjugated insulin intermediate is treated with trypsin to cleave the N-terminal protecting amino acid sequences to give an insulin- conjugate wherein solely Lys B29 is conjugated.
- the insulin intermediate is derived from a single chain insulin precursor as described in U.S. Patent No. 7,402,565.
- the insulin intermediate is a mutant that contains a conjugation site other than Lys B29 and an analogous synthesis to the one described for Lys B29 is performed. It will be appreciated that these exemplary procedures may be used to produce other conjugates with different ligands and drugs, different conjugation chemistries, different separations between framework components, and/or different valencies by substituting the TSAT-C6 framework with a different framework as described below.
- an appropriately-sized amine-bearing diethyl acetal e.g., aminopropionaldehyde diethyl acetal (APDA) or aminobutyraldehyde diethyl acetal (ABDA)
- APDA aminopropionaldehyde diethyl acetal
- ABDA aminobutyraldehyde diethyl acetal
- a reactive aldehyde group can then be revealed from the diethyl acetal under acidic conditions followed by a reductive amination with insulin to complete the drug conjugation step then ABDA-TSAT, ABD A-LCTSAT, etc. may be employed.
- tetrakis-(N-succinimidyl carboxypropyl)pentaerythritol may be used to attach three ligands per conjugation site for increased multivalency.
- TSPE tetrakis-(N-succinimidyl carboxypropyl)pentaerythritol
- ligands already containing a predetermined degree of multivalency may again be reacted according to the procedures described above to produce even higher orders of ligand multiplicity.
- a divalent AEM-2, AEBM-2, or AETM-2 molecule containing a terminal reactive amine may be prepared by conjugating two of each ligand to a suitable framework to which a reactive amine is also conjugated.
- a trivalent AEM-3, AEBM-3, or AETM-3 molecule containing a terminal reactive amine may be prepared by conjugating three of each ligand to a suitable framework to which a reactive amine is also conjugated.
- the NH 2 - divalent saccharides may be reacted with the same frameworks described above to produce drug conjugates with 4 and 6 ligands per drug molecule.
- the NH2-trivalent saccharides may be reacted with the same frameworks described above to produce drug conjugates with 6 and 9 ligands per drug molecule.
- a mixture of different ligands may be conjugated to the same drug via a multivalent framework by adjusting the framework chemistry, valency, and the ligand: framework stoichiometry.
- Insulin- AEM-I -AEBM-I, Insulin- AEBM-I -AETM-I, Insulin- AEM-2-AETM-2, and Insulin-AEM-l-AETM-2 may all be synthesized according to this mixed ligand method.
- a divalent maleimide/monovalent activate ester functionalized framework e.g., succinimidyl-3,5-dimaleimidophenyl benzoate (SDMB)
- SDMB succinimidyl-3,5-dimaleimidophenyl benzoate
- insulin or another amine-containing drug may be conjugated to the activated ester portion of the framework using methods described herein.
- the aminoethyl saccharide (AEM, AEBM, AETM) may be converted to a terminal sulfhydryl- bearing ligand by reaction with 4-iminothiolane.
- the framework-di-maleimide-insulin conjugate may be mixed with an excess of sulfhydryl-functionalized saccharide to produce the resulting divalent-ligand-insulin conjugate.
- the sustained release formulation may exhibit a zero-order release of the conjugate when administered to a mammal under non-hyperglycemic conditions (i.e., fasted conditions). It will be appreciated that any formulation that provides a sustained absorption profile may be used. In certain embodiments this may be achieved by combining the conjugate with other ingredients that slow its release properties into systemic circulation.
- PZI protamine zinc insulin
- PZI and NPH neutral protamine Hagedorn
- some PZI-conjugate preparations required about 1 to about 5 mg protamine/mg conjugate in order to effectively sustain the absorption profile.
- protamine insulin preparations contain about 0.006 mg zinc/mg insulin
- increasing the zinc concentration along with the protamine concentration can, in certain embodiments, lead to more stable, easily dispersible formulations.
- the zinc content is in the range of about 0.05 to about 0.5 mg zinc/mg conjugate.
- insulin conjugates substituted at the Bl -amine group require more protamine and zinc to effectively sustain the release profile versus an insulin conjugate substituted at the B29-amine group.
- the present disclosure encompasses amorphous and crystalline forms of these PZI formulations.
- a formulation of the present disclosure includes from about 0.05 to about 10 mg protamine/mg conjugate.
- a formulation of the present disclosure includes from about 0.05 to about 10 mg protamine/mg conjugate.
- from about 0.2 to about 10 mg protamine/mg conjugate e.g., about 1 to about 5 mg protamine/mg conjugate.
- a formulation of the present disclosure includes from about
- 0.006 to about 0.5 mg zinc/mg conjugate For example, from about 0.05 to about 0.5 mg zinc/mg conjugate, e.g., about 0.1 to about 0.25 mg zinc/mg conjugate.
- a formulation of the present disclosure includes protamine and zinc in a ratio (w/w) in the range of about 100:1 to about 5:1, for example, from about 50:1 to about 5:1, e.g., about 40:1 to about 10:1.
- a PZI formulation of the present disclosure includes protamine and zinc in a ratio (w/w) in the range of about 20:1 to about 5:1, for example, about 20:1 to about 10:1, about 20:1 to about 15:1, about 15:1 to about 5:1, about 10:1 to about 5:1, about 10:1 to about 15:1.
- the Examples also describe the benefits of including one or more of the following components in a PZI formulation: an antimicrobial preservative, an isotonic agent, and/or an unconjugated insulin molecule.
- a formulation of the present disclosure includes an antimicrobial preservative (e.g., m-cresol, phenol, methylparaben, or propylparaben).
- the antimicrobial preservative is m-cresol.
- a formulation may include from about 0.1 to about 1.0% v/v m-cresol.
- from about 0.1 to about 0.5% v/v m-cresol e.g., about 0.15 to about 0.35% v/v m-cresol.
- a formulation of the present disclosure includes a polyol as isotonic agent (e.g., mannitol, propylene glycol or glycerol).
- the isotonic agent is glycerol.
- the isotonic agent is a salt, e.g., NaCl.
- a formulation may comprise from about 0.05 to about 0.5 M NaCl, e.g., from about 0.05 to about 0.25 M NaCl or from about 0.1 to about 0.2 M NaCl.
- a formulation of the present disclosure includes an amount of unconjugated insulin molecule.
- a formulation includes a molar ratio of conjugated insulin molecule to unconjugated insulin molecule in the range of about 100:1 to 1 :1, e.g., about 50:1 to 2:1 or about 25:1 to 2:1.
- the present disclosure also encompasses the use of standard sustained (also called extended) release formulations that are well known in the art of small molecule formulation (e.g., see Remington 's Pharmaceutical Sciences, 19 th ed., Mack Publishing Co., Easton, PA, 1995).
- the present disclosure also encompasses the use of devices that rely on pumps or hindered diffusion to deliver a conjugate on a gradual basis.
- a long acting formulation may (additionally or alternatively) be provided by using a modified insulin molecule. For example, one could use insulin glargine (LANTUS®) or insulin detemir (LEVEMIR®) instead of wild-type human insulin in preparing the conjugate.
- Insulin glargine is an exemplary long acting insulin analog in which Asp-A21 has been replaced by glycine, and two arginines have been added to the C-terminus of the B-chain. The effect of these changes is to shift the isoelectric point, producing a solution that is completely soluble at pH 4.
- Insulin detemir is another long acting insulin analog in which Thr-B30 has been deleted, and a C 14 fatty acid chain has been attached to Lys-B29.
- the present disclosure provides methods of using conjugates.
- the conjugates can be used to controllably provide a bioactive drug in response to a saccharide (e.g., glucose or an exogenous saccharide such as mannose, alpha-methyl mannose, L-fucose, etc. as described herein).
- a saccharide e.g., glucose or an exogenous saccharide such as mannose, alpha-methyl mannose, L-fucose, etc. as described herein.
- the disclosure encompasses treating a disease or condition by administering a conjugate of the present disclosure.
- the conjugates can be used to treat any patient (e.g., dogs, cats, cows, horses, sheep, pigs, mice, etc.), they are most preferably used in the treatment of humans.
- a conjugate can be administered to a patient by any route.
- the most appropriate route of administration will depend upon a variety of factors including the nature of the disease or condition being treated, the nature of the drug, the condition of the patient, etc.
- the present disclosure encompasses administration by oral, intravenous, intramuscular, intra-arterial, subcutaneous, intraventricular, transdermal, rectal, intravaginal, intraperitoneal, topical (as by powders, ointments, or drops), buccal, or as an oral or nasal spray or aerosol.
- General considerations in the formulation and manufacture of pharmaceutical compositions for these different routes may be found, for example, in Remington 's Pharmaceutical Sciences, 19 th ed., Mack Publishing Co., Easton, PA, 1995.
- the conjugate may be administered subcutaneously, e.g., by injection.
- the conjugate can be dissolved in a carrier for ease of delivery.
- the carrier can be an aqueous solution including, but not limited to, sterile water, saline or buffered saline.
- a therapeutically effective amount of a drug in the form of a conjugate will be administered.
- a "therapeutically effective amount" of a drug is meant a sufficient amount of the drug to treat the disease or condition at a reasonable benefit/risk ratio, which involves a balancing of the efficacy and toxicity of the drug.
- therapeutic efficacy and toxicity may be determined by standard pharmacological procedures in cell cultures or with experimental animals, e.g., by calculating the ED50 (the dose that is therapeutically effective in 50% of the treated subjects) and the LD50 (the dose that is lethal to 50% of treated subjects).
- the ED50/LD50 represents the therapeutic index of the drug.
- drugs having a large therapeutic index are preferred, as is well known in the art, a smaller therapeutic index may be acceptable in the case of a serious disease or condition, particularly in the absence of alternative therapeutic options.
- Ultimate selection of an appropriate range of doses for administration to humans is determined in the course of clinical trials.
- the drug is insulin and the average daily dose of insulin is in the range of 10 to 200 U, e.g., 25 to 100 U (where 1 Unit of insulin is ⁇ 0.04 mg).
- an amount of conjugate with these insulin doses is administered on a daily basis.
- an amount of conjugate with 5 to 10 times these insulin doses is administered on a weekly basis.
- an amount of conjugate with 10 to 20 times these insulin doses is administered on a bi-weekly basis.
- an amount of conjugate with 20 to 40 times these insulin doses is administered on a monthly basis.
- a conjugate of the present disclosure may be used to treat hyperglycemia in a patient (e.g., a mammalian patient).
- the patient is diabetic.
- the present methods are not limited to treating diabetic patients.
- a conjugate may be used to treat hyperglycemia in a patient with an infection associated with impaired glycemic control.
- a conjugate may be used to treat diabetes.
- a conjugate or formulation of the present disclosure when administered to a patient (e.g., a mammalian patient) it induces less hypoglycemia than an unconjugated version of the insulin molecule.
- a formulation of the present disclosure (with a conjugate that includes an insulin molecule as the drug) induces a lower HbAIc value in a patient (e.g., a mammalian patient) than a formulation comprising an unconjugated version of the insulin molecule.
- the formulation leads to an HbAIc value that is at least 10% lower (e.g., at least 20% lower, at least 30% lower, at least 40% lower, at least 50% lower) than a formulation comprising an unconjugated version of the insulin molecule.
- the formulation leads to an HbAIc value of less than 7%, e.g., in the range of about 4 to about 6%.
- a formulation comprising an unconjugated version of the insulin molecule leads to an HbAIc value in excess of 7%, e.g., about 8 to about 12%.
- a conjugate of the present disclosure may be administered on more than one occasion.
- the present disclosure specifically encompasses methods in which a conjugate is administered by subcutaneous injection to a patient on a continuous schedule (e.g., once a day, once every two days, once a week, once every two weeks, once a month, etc.).
- a continuous schedule e.g., once a day, once every two days, once a week, once every two weeks, once a month, etc.
- a conjugate of the present disclosure may be administered to a patient who is receiving at least one additional therapy.
- the at least one additional therapy is intended to treat the same disease or disorder as the administered conjugate.
- the at least one additional therapy is intended to treat a side-effect of the primary drug.
- the two or more therapies may be administered within the same, overlapping or non-overlapping timeframes as long as there is a period when the patient is receiving a benefit from both therapies.
- the two or more therapies may be administered on the same or different schedules as long as there is a period when the patient is receiving a benefit from both therapies.
- the two or more therapies may be administered within the same or different formulations as long as there is a period when the patient is receiving a benefit from both therapies.
- a single conjugate of the present disclosure may include more than one drug for treating the same disease or disorder.
- two or more separate conjugates of the present disclosure may be administered (as a mixture or separately) that include different drugs for treating the same disease or disorder.
- an unconjugated secondary drug may be admixed with a conjugate of the present disclosure (i.e., a drug which is simply mixed with the conjugate formulation and not covalently bound to the conjugate).
- any of these approaches may be used to administer more than one anti-diabetic drug to a subject. Certain exemplary embodiments of this approach are described in more detail below in the context of insulin-related therapies; however, it will be appreciated from the foregoing that other therapies will benefit from such combination approaches.
- Insulin sensitizers act by increasing a patient's response to a given amount of insulin.
- a patient receiving an insulin sensitizer will therefore require a lower dose of an insulin conjugate of the present disclosure than an otherwise identical patient would.
- an insulin conjugate may be administered to a patient who is also being treated with an insulin sensitizer.
- the conjugate of the present disclosure may be administered at up to 75% of the normal dose required in the absence of the insulin sensitizer. In various embodiments, up to 50, 40, 30 or 20% of the normal dose may be administered.
- Insulin resistance is a disorder in which normal amounts of insulin are inadequate to produce a normal insulin response.
- insulin-resistant patients may require high doses of insulin in order to overcome their resistance and provide a sufficient glucose-lowering effect.
- insulin doses that would normally induce hypoglycemia in less resistant patients fail to even exert a glucose-lowering effect in highly resistant patients.
- the conjugates of the present disclosure are only effective for this subclass of patients when they provide high levels of bioactive insulin in a suitable timeframe.
- the treatment of this subclass of patients may be facilitated by combining the two approaches.
- a traditional insulin-based therapy is used to provide a baseline level of insulin and a conjugate of the present invention is administered to provide a controlled supplement of bioactive insulin when needed by the patient.
- insulin conjugates may be administered to a patient who is also being treated with insulin.
- the insulin may be administered at up to 75% of the normal dose required in the absence of a conjugate of the present disclosure. In various embodiments, up to 50, 40, 30 or 20% of the normal dose may be administered.
- insulin resistant patients who are receiving an insulin secretagogue (e.g., a sulfonylurea, GLP-I, exendin-4, etc.) and/or an insulin sensitizer (e.g., a biguanide such as metformin, a glitazone).
- an insulin secretagogue e.g., a sulfonylurea, GLP-I, exendin-4, etc.
- an insulin sensitizer e.g., a biguanide such as metformin, a glitazone.
- a conjugate may be triggered by exogenous administration of a saccharide other than glucose such as alpha-methyl mannose and L-fucose or any other saccharide that can alter the PK or PD properties of the conjugate.
- a conjugate Once a conjugate has been administered as described above (e.g., as a sustained release formulation) it can be triggered by administration of a suitable exogenous saccharide.
- a triggering amount of the exogenous saccharide is administered.
- a "triggering amount" of exogenous saccharide is an amount sufficient to cause a change in at least one PK and/or PD property of the conjugate (e.g., C max , AUC, half- life, etc. as discussed previously). It is to be understood that any of the aforementioned methods of administration for the conjugate apply equally to the exogenous saccharide. It is also be to be understood that the methods of administration for the conjugate and exogenous saccharide may be the same or different.
- the methods of administration are different (e.g., for purposes of illustration the conjugate may be administered by subcutaneous injection on a weekly basis while the exogenous saccharide is administered orally on a daily basis).
- the oral administration of an exogenous saccharide is of particular value since it facilitates patient compliance.
- the PK and PD properties of the conjugate will be related to the PK profile of the exogenous saccharide.
- the conjugate PK and PD properties can be tailored by controlling the PK profile of the exogenous saccharide.
- the PK profile of the exogenous saccharide can be tailored based on the dose, route, frequency and formulation used.
- an oral immediate release formulation might be used.
- an oral extended release formulation might be used instead.
- General considerations in the formulation and manufacture of immediate and extended release formulation may be found, for example, in Remington 's Pharmaceutical Sciences, 19 th ed., Mack Publishing Co., Easton, PA, 1995.
- the relative frequency of administration of a conjugate of the present disclosure and an exogenous saccharide may be the same or different.
- the exogenous saccharide is administered more frequently than the conjugate.
- the conjugate may be administered daily while the exogenous saccharide is administered more than once a day.
- the conjugate may be administered twice weekly, weekly, biweekly or monthly while the exogenous saccharide is administered daily.
- the conjugate is administered monthly and the exogenous saccharide is administered twice weekly, weekly, or biweekly. Other variations on these schemes will be recognized by those skilled in the art and will vary depending on the nature of the conjugate and formulation used.
- This first set of examples describes various methods for making exemplary conjugates.
- the examples also include assays for purifying and assaying the starting ingredients and final products. It is to be understood that these methods can be modified to produce other conjugates that fall within the scope of the invention.
- DOWEX 50Wx4 resin (Alfa Aesar, Ward Hill, MA) was washed with deionized water to remove color.
- DOWEX 50Wx4 was treated with 2.2 L 2-bromoethanol (30.5 mol, 25 equiv.; 124.97 gm/mol;
- the amber oil was purified on silica gel (4 kg silica packed in DCM) in the following manner.
- the crude was dissolved in DCM and loaded onto the column, and then eluted with 2 x 4L 10% methanol/DCM; 2 x 4L 15% methanol/DCM; and 3 x 4L 20% methanol/DCM.
- Product containing fractions (on the basis of TLC) were pooled and stripped to dryness to afford 152 gm of 1- ⁇ -bromoethyl-glucose (42%).
- AzEM azidoethylglucose
- the oil was dissolved in 2 L water and treated with 68.3 gm sodium azide (1.05 mol, 2 equiv.; 65 gm/mol; Alfa-Aesar) followed by 7.9 gm sodium iodide (52.5 mmol, 0.08 equiv.; 149.89 gm/mol; Alfa-Aesar) and the solution warmed to 50 C and stirred overnight.
- the solution was cooled to room temperature and concentrated to dryness on the rotovap.
- the solid was taken into a minimum of methanol (50 mL) and ethyl acetate (150 mL) was added slowly with stirring. The heavy slurry was cooled and filtered. The solid was air dried (hygroscopic) and put in a 60 C oven overnight. TLC has very little origin material. Yield 15.4 gm. The Mother Liquor was evaporated under vacuum to a yellow gum. No attempt was made to further purify this material at this time.
- DCM methanol/dichloromethane
- the solution is filtered to remove the resin, and the resin washed with ethyl acetate and DCM.
- the resulting filtrate is stripped to an amber oil in a rotory evaporator.
- the amber oil is purified on silica gel (4 kg silica packed in DCM) in the following manner.
- the crude is dissolved in DCM and loaded onto the column, and then eluted with 2 x 4L 10% methanol/DCM; 2 x 4L 15% methanol/DCM; and 3 x 4L 20% methanol/DCM.
- Product containing fractions (on the basis of TLC) are pooled and stripped to dryness to afford 152 gm of 1- ⁇ -bromoethyl-mannose (42%).
- the oil is dissolved in 2 L water and treated with 68.3 gm sodium azide (1.05 mol, 2 equiv.; 65 gm/mol; Alfa-Aesar) followed by 7.9 gm sodium iodide (52.5 mmol, 0.08 equiv.; 149.89 gm/mol; Alfa- Aesar) and the solution warmed to 50 C and stirred overnight.
- the solution is cooled to room temperature and concentrated to dryness on the rotovap.
- the solid residue is digested with 3 x 500 mL of 5:1 vol. CHCl3:MeOH at 40 C.
- the combined organic portions are filtered and evaporated to dryness to afford azidoethylmannose as an off- white solid.
- the solid is taken into a minimum of methanol (50 mL) and ethyl acetate (150 mL) is added slowly with stirring. The heavy slurry is cooled and filtered. The solid is air dried (hygroscopic) and put in a 60 C oven overnight. The Mother Liquor is evaporated under vacuum to a yellow gum.
- the AzEM compound from Example 2 is selectively protected using benzene dimethyl ether, purified by column chromatography and subsequently reacted with benzyl bromide to give l- ⁇ -(2-azidoethyl)-4,6-benzaldehyde diacetal-3-benzyl-mannopyranoside.
- the product is subsequently glycosylated with l- ⁇ -bromo-2,3,4,6-tetrabenzoylmannopyranoside using silver triflate chemistry under rigorously anhydrous conditions to give the protected- azidoethylmannobiose product.
- the intermediate product is then deprotected to remove the benzoyl groups to give AzEBM.
- AzETM Azidoethylmannotriose
- reaction solution was diluted with an equal volume (160 mL) of DCM and extracted successively with water (2x 500 mL), saturated bicarbonate (2x 50 mL) and Brine (1x50 mL), dried over magnesium sulfate and the solvent evaporated to give 41 gm of solid foam. (Theoretical yield 40.1 gm) and was stored under N 2 in a freezer. This material was used without further purification.
- the reaction was monitored by TLC: silica gel (Hexane/Ethyl Acetate, 7/3) starting material R f 0.65, product R f 0.8 UV visualization.
- the product was taken into 40 mL toluene, stirred for 1 hour and then set in the freezer for an additional 2 hours.
- the solid was filtered and washed (2x10 mL) with ice cold toluene and air dried to a constant weight to give 18.5 gm of the single isomer product 2,4- dibenzoylazidoethylmannose in 83% yield.
- the mother liquors contained the undesired isomer and a small amount of the desired isomer.
- the reaction was monitored by TLC: SG (Hexane/Ethyl Acetate 7/3) Starting Material R f 0.0, orthoester intermediate R f 0.9.
- the azido-terminated compounds from Examples 1-4 are readily hydrogenated at room temperature by using palladium/carbon catalyst, a small amount of acetic acid, and ethanol as a solvent to give the corresponding amine-terminated compounds.
- Figure 10 shows the chemical structures of AEG, AEM, AEBM, AETM. The process is identical to the one described for AETM below, except that those skilled in the art will understand that the amounts of reagents, solvents, etc. should be scaled to the number of moles of saccharide-ligand to be hydrogenated.
- HPLC of this material (C 18, 3% Acetonitrile/97% 0.1% H 3 PO 4 , 220 nm, 2 ml/min) gave uv adsorption of the injection column void material, Rt 2.5 minutes, indicative of benzoate ester.
- the filtrate was diluted with 70 mL water and 12 mL of IN NaOH and the solution stirred overnight at room temperature (HPLC: no uv material at column void Rt 2.5 min., uv material at Rt 10.5 minutes co-eluting with benzoic acid). 2 gm of decolorizing charcoal were added and the stirring suspension heated to 80 C, cooled to room temperature and filtered over celite. The filtrate pH was adjusted to 8.0 with 2N HCl and the colorless solution concentrated under vacuum to about 50% volume.
- the solution was loaded onto a resin column (Dowex 5OW, 50 gm) and washed with water until eluting fractions were neutral to pH (6x75 mL) removing any residual acid byproducts.
- the amine product was washed off the column with 0.25N ammonium hydroxide (6x75 mL) and the fractions containing the amine product-ninhydrin detection were combined and concentrated to 25-30 mL under vacuum. This concentrated solution was added drop-wise to 300 mL stirring ethanol and stirring continued for an additional 2 hours. The product was filtered, washed with fresh ethanol (2x50 mL) and air dried to a constant weight.
- N-boc-ethylenediamine (18.3 gm, 0.1143 mol) in 50 ml of CH3CN was added slowly via an addition funnel to a stirred solution containing dipropargylacetic acid (15.56 gm, 0.1143 mol), TBTU (36.74 gm, 0.114 mol) and DIPEA (29.6 gm, 0.229 mol) in 300ml of CH 3 CN at 0 C. Precipitation occurred. The ice bath was removed and the product was stirred at ambient temperature overnight (16 hours). The reaction was now totally homogeneous. The solution was concentrated in vacuo and the residue was diluted with 800ml of water.
- a preparative reverse phase HPLC method is used to isolate the pure BOC2-insulin from the crude powder.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the crude powder is dissolved at 25 mg/ml in a 70%A/30%B mixture and syringe filtered prior to injection on the column. Before purification, the column (Waters SymmetryPrep C 18, 7 um, 19 x 150 mm) is equilibrated at 15 ml/minutes with a 70%A/30%B mobile phase using a Waters DeltraPrep 600 system.
- Example 10 Dendritic framework synthesis a. Hydrogenation of nitro-group containing, alkyne-terminally functionalized dendrons
- the dendron is dissolved in 100 mL a 50:50 vol. mixture of DCM and ethanol, and 0.8 gm of 5% Pd/C is added.
- the vigorously stirring suspension is hydrogenated at 30-40 psi for 48 hours or until no starting material is apparent by TLC.
- the suspension is filtered over celite, which is rinsed with ethanol (2x50 mL) and the filtrate concentrated under vacuum.
- the filtrate is diluted with 70 mL water and 12 mL of IN NaOH and the solution stirred overnight at room temperature. 2 gm of decolorizing charcoal are added and the stirring suspension heated to 80 C, cooled to room temperature and filtered over celite. The filtrate pH is adjusted to 8.0 with 2N HCl and the colorless solution concentrated under vacuum to about 50% volume.
- the solution is loaded onto a resin column (Dowex 5OW, 50 gm) and washed with water until eluting fractions are neutral to pH (6x75 mL) removing any residual acid by-products.
- the amine product is washed off the column with 0.25N ammonium hydroxide (6x75 mL) and the fractions containing the amine product (ninhydrin detection) are combined and evaporated to vacuum using a rotary evaporator.
- the resulting mixture is concentrated under vacuum to one half volume and filtered thru a micro-glass filter.
- the filtrate is loaded on a resin column (Dowex 5Ow 50x4-100) and eluted with water (6x 75 mL) until neutral.
- the column is then eluted with 15% ammonium hydroxide (10x75 mL) and the fractions positive to ninhydrin are pooled and concentrated to a glassy foam.
- a framework containing N-terminal activated esters is dissolved at 60 mM in 1.0 ml of anhydrous DMSO followed by the addition of 400 ul (excess) of triethylamine (TEA). The solution is stirred rapidly for 10 minutes at room temperature. The amine -bearing drug is then dissolved separately in 7.9 ml of DMSO at a concentration of 7.4 mM. Once dissolved, the entire drug solution is added dropwise over the course of 10 minutes to the frame work/DM SO/TEA solution followed by room temperature mixing for two hours. The remaining activated esters are then reacted with amine-functionalized ligands in the following manner. A 370 mM solution of ligand is prepared in an appropriate volume of dry DMSO.
- the resulting solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters C8, 7 um, 19 x 150 mm column.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column Before purification, the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes. The retention time of the desired peak will vary depending on the drug, framework, and ligand used. Once collected, the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate whose identity may be verified by LC-MS (HT Laboratories, San Diego, CA).
- Example 12 Bl-insulin conjugates with multivalent saccharides - homogeneous ligand
- Tris-Succinimidyl-l,3,5-benzenetricarboxylate TAB
- TSAT tris-Succinimidyl aminotriacetate
- TSAT-C6 tris-Succinimidyl (6- aminocaproyl)aminotriacetate
- tetrakis-(N-succinimidyl carboxypropyl)pentaerythritol TSPE activated ester frameworks were purchased from Molecular Biosciences (Boulder, CO) and used without further purification.
- the TSB-C4 and TSB-C6 frameworks were synthesized according to Example 9.
- the AEM, AEBM, and AETM ligands were synthesized according to Examples 1-5.
- the appropriately sized size exclusion medium is Biogel P2 (Bio-Rad Laboratories, Hercules, CA), and the appropriately sized ultrafiltration membrane molecular weight cutoff is 3 kD.
- the BOC protecting groups were removed by dissolving the lyophilized powder obtained according to Example 11 in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150M NaCl.
- the pH was adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution was then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to approximately 58 U of insulin/ml (based on A280 measurements) and stored at 4 C until needed. Because the starting NH 2 -B l-BOC2(Al,B29)-insulin material only possesses one free amine group at the Phe-Bl terminus, the Phe-Bl is the only site of insulin conjugation to the framework as verified in each deprotected final product by N-terminal sequencing.
- the framework MW values are for the activated esters of the frameworks. This is so one can immediately calculate the mass of activated ester framework to add to the reaction mixture. Once reacted, the framework loses the activated esters and so the MW contribution in the final product is much lower.
- the TSAT-C6 and TSPE activated ester frameworks were purchased from Molecular
- Biosciences (Boulder, CO) and used without further purification.
- the AEM, AEBM, and AETM were synthesized according to Examples 1-5.
- the appropriately sized size exclusion medium is Biogel P2 (Bio-Rad Laboratories, Hercules, CA), and the appropriately sized ultrafiltration membrane molecular weight cutoff is 3 kD.
- the BOC protecting groups were removed by dissolving the lyophilized powder obtained according to Example 11 in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150M NaCl.
- the pH was adjusted to between 7.0 and 8.0 using NaOH solution after which the material was passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution was then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to the desired level and stored at 4 C until needed. Because the starting NH 2 -Bl- BOC2(Al,B29)-insulin material only possesses one free amine group at the Phe-Bl terminus, the Phe-Bl is the only site of insulin conjugation to the framework as verified in each deprotected final product by N-terminal sequencing.
- Example 14 Bl-insulin conjugates with multivalent saccharides using premade multivalent saccharides
- the following insulin conjugates are prepared from pre-synthesized multivalent amine-containing ligands.
- the disuccinimidyl suberate (DSS) and TSAT-C6 activated ester frameworks are purchased from Molecular Biosciences (Boulder, CO) and used without further purification.
- Divalent AEM-2, AEBM-2, and AETM -2 molecules containing a terminal reactive amine are prepared by conjugating two of each ligand to a suitable framework to which a reactive amine is also conjugated.
- Trivalent AEM-3, AEBM-3, and AETM-3 molecules containing a terminal reactive amine are prepared by conjugating three of each ligand to a suitable framework to which a reactive amine is also conjugated.
- the appropriately sized size exclusion medium is Biogel P2 (Bio-Rad Laboratories, Hercules, CA), and the appropriately sized ultrafiltration membrane molecular weight cutoff is 3 kD.
- the BOC protecting groups are removed by dissolving the lyophilized powder obtained according to Example 11 in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150 M NaCl.
- the pH is adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution is then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to the desired level and stored at 4 C until needed. Because the starting NH 2 -Bl- BOC2(A1,B29)-Insulin material only possesses one free amine group at the Phe-Bl terminus, the Phe-Bl is the only site of insulin conjugation to the framework as verified in each deprotected final product by N-terminal sequencing.
- Example 15 Bl-insulin conjugates with multivalent saccharides using dendritic framework - homogeneous ligand
- DSS disuccinimidyl suberate
- the resulting conjugate is superdiluted in water, and the pH adjusted to 8.0.
- the solution is desalted using BioGel P2, followed by concentration using Amicon 3k ultrafiltration devices.
- the resulting solution is purified by reverse phase chromatography, rotovapped to remove acetonitrile, and lyophilized.
- the BOC protecting groups are removed by dissolving the lyophilized powder in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150 M NaCl.
- the pH is adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution is then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to the desired level and stored at 4 C until needed. Because the starting NH 2 -B l-BOC2(Al,B29)-insulin material only possesses one free amine group at the Phe-Bl terminus, the Phe-Bl is the only site of insulin conjugation to the framework and is verified in each deprotected final product by N-terminal sequencing.
- the insulin-TEA solution is slowly added to the insulin-TEA solution as a 1.0 M solution of the Fmoc-NHS in THF.
- the reaction is mixed for approximately one hour.
- the reaction is quenched via the addition of 4 ml of a stock solution containing 250 ul of ethanolamine in 5 ml of DMSO followed by mixing for five minutes. After quenching, the entire solution is poured into 1600 ml of acetone and mixed briefly with a spatula. Next, 8 x 400 ⁇ l aliquots of a 18.9% HChwater solution are added dropwise over the surface of the mixture to precipitate the reacted insulin.
- the precipitated material is then centrifuged and the supernatant decanted into a second beaker while the precipitate cake is set aside.
- To the supernatant solution another 8 x 400 ⁇ l aliquots of a 18.9% HChwater solution are added dropwise over the surface of the mixture to obtain a second precipitate of reacted insulin.
- This second precipitate is centrifuged and the supernatant is discarded.
- the combined centrifuge cakes from the two precipitation steps are washed once with acetone followed by drying under vacuum at room temperature to yield the crude powder which typically contains 20% of the Fmocl product, 65% of the Fmoc2 product, and 15% of unreacted insulin.
- a preparative reverse phase HPLC method is used to isolate the pure desired Fmocl - insulin from the crude powder.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the crude powder is dissolved at 25 mg/ml in a 70%A/30%B mixture and syringe filtered prior to injection on the column. Before purification, the column (Waters SymmetryPrep Cl 8, 7 um, 19 x 150 mm) is equilibrated at 15 ml/minutes with a 70%A/30%B mobile phase using a Waters DeltraPrep 600 system.
- a preparative reverse phase HPLC method is used to isolate the pure BOC2-Fmoc-l- insulin from the crude powder.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the crude powder is dissolved at 25 mg/ml in a 70%A/30%B mixture and syringe filtered prior to injection on the column. Before purification, the column (Waters SymmetryPrep Cl 8, 7 um, 19 x 150 mm) is equilibrated at 15 ml/minutes with a 70%A/30%B mobile phase using a Waters DeltraPrep 600 system.
- the Fmoc protecting group of the BOC2(Al,Bl)-Fmoc(B29) is removed by dissolving the lyophilized powder obtained according to the previous step in 20% piperidine in dimethylformamide (DMF) for 30 minutes at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150 M NaCl.
- the pH is adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove Fmoc, DMF, and any other contaminating salts.
- the NH 2 -(B29)-BOC2(Al,Bl)-insulin is lyophilized into a powder if needed or used directly in aqueous solution if desired.
- This example describes an alternative to the method described in Example 11 in which the drug is added to the framework before the ligand(s).
- the ligand(s) are added to the framework before the drug.
- a framework containing N terminal activated esters is dissolved at 60 mM in 1 ml of anhydrous DMSO followed by the addition of 400 ul (excess) of triethylamine (TEA). The solution is stirred rapidly for 10 minutes at room temperature.
- a 122 mM solution of ligand is prepared in an appropriate volume of anhydrous DMSO. Once dissolved, enough ligand solution is added dropwise over the course often minutes to provide a number of reactive equivalents equal to exactly the number of activated ester groups on the framework, N, minus one.
- the amine-bearing drug is then dissolved separately in 7.5 ml of anhydrous DMSO at a concentration of 8.1 mM. Once dissolved, the entire drug solution is added over the course of one minute to the framework/DMSO/ligand/TEA solution followed by room temperature mixing for an additional two hours to ensure complete reaction.
- the resulting solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters SymmetryPrep C 18, 7 um column, 19 x 150 mm.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes.
- the retention time of the desired peak will vary depending on the drug, framework, and ligand used.
- Example 20 Amine- functionalized drug conjugation with multivalent activated esters in aqueous solvent (drug added last)
- Example 18 describes an alternative to the method described in Example 18 in which the reaction is performed in aqueous solvent instead of organic solvent.
- the framework containing N terminal activated esters is dissolved at 60 mM in 6.25 ml of anhydrous DMSO followed by the addition of 2 ml (excess) of triethylamine (TEA). The solution is stirred rapidly for 10 minutes at room temperature.
- a 448 mM solution of ligand is prepared in an appropriate volume of anhydrous DMSO. Once dissolved, enough ligand solution is added dropwise over the course often minutes to provide a number of reactive equivalents equal to 1.5 times the number of activated ester groups on the framework, N, minus one.
- the amine-bearing drug is then dissolved separately at 17.2 mM in 2.67 ml of a 0.1M, pH 11 sodium carbonate buffer and the pH subsequently adjusted to 10.8 with 1.0N sodium hydroxide.
- the entire framework/DMSO/ligand/TEA solution is added dropwise over the course of 75 minutes to the drug/carbonate buffer solution.
- the pH of the resulting mixture is adjusted every 5 minutes to 10.8 if necessary using dilute HCl or NaOH.
- the solution is allowed to stir for an additional 15 minutes after the dropwise addition to ensure complete reaction.
- the resulting solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 40 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters SymmetryPrep C 18, 7 um, 19 x 150 mm column.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes. The retention time of the desired peak will vary depending on the drug, framework, and ligand used.
- the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate whose identity may be verified by LC-MS (HT Laboratories, San Diego, CA).
- Example 21 B29-AEM-2-insulin conjugate synthesized in aqueous solvent from unprotected insulin
- the appropriately sized size exclusion medium was Biogel P2 (Bio-Rad Laboratories, Hercules, CA), and the appropriately sized ultrafiltration membrane molecular weight cutoff was 3 kD.
- the final product (95% pure by HPLC) was found to have the desired MW of 6729 g/mol (LC-MS), representing a total of 2.0 AEM molecules conjugated per insulin, with greater than 85% of the conjugate molecules conjugated at the Lys-B29 site (N -terminal sequencing).
- Example 22 Generalized amine-functionalized drug conjugation with aldehyde- containing framework a.
- Framework functionalized with more than one ligand and one terminal aldehyde First, a framework containing N terminal activated esters is dissolved at 60 mM in 27.0 ml of anhydrous DMSO followed by the addition of 800 ul (excess) of triethylamine (TEA). The solution is stirred rapidly for 10 minutes at room temperature. A stock solution of amine-bearing diethyl acetal is prepared at 580 mM in 5 ml of anhydrous DMSO.
- the aldehyde group is generated from the diethyl acetal by dissolving the collected material in 60 ml of DI water with the solution pH adjusted to 1.0. The solution is mixed for 30 minutes after which 6 ml of a 200 mM HEPES pH 8.2 buffer containing 1.5 M NaCl is added and the solution pH adjusted to 6.5 using dilute NaOH solution. 48 mmol of the amine containing drug are added to the solution and the pH readjusted to 6.5 if necessary.
- a stock solution of reducing agent is prepared by dissolving 1.5 g of sodium cyanoborohydride (Sigma Aldrich, St.
- the resulting aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml.
- This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters SymmetryPrep C 18, 7 um column, 19 x 150 mm.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem.
- Example 23 AEM-2-framework containing a terminal reactive aldehyde group and subsequent insulin conjugation at Bl a.
- TSA T functionalized with 2 AEM and 1 aminobutyraldehyde diethyl acetal (ABDA)
- the appropriately sized size exclusion medium was Biogel P2 (Bio-Rad Laboratories, Hercules, CA), and the appropriately sized ultrafiltration membrane molecular weight cutoff was 3 kD.
- the Phe-Bl is the only site of insulin conjugation to the framework.
- the BOC protecting groups were removed by dissolving the lyophilized powder in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150 M NaCl. The pH was adjusted to between 7.0 and 8.0 using NaOH solution after which the material was passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts. The deprotected, purified aqueous conjugate solution was then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to the desired level and stored at 4 C until needed.
- the final product (95% pure by HPLC) was found to have the desired MW of 6462 g/mol (LC-MS), representing a total of 2.0 AEM molecules conjugated per insulin, 99% of which were conjugated at the Phe-Bl site (N-terminal sequencing).
- Example 24 AEM-3-framework containing a terminal reactive aldehyde group and subsequent insulin conjugation at Bl a.
- ABDA butyr aldehyde diethyl acetal
- AEM-3-ABDA produced in (a) above along with the amine-bearing drug, NH 2 -Bl- BOC2(Al,B29)-insulin (MW 6,008 g/mol), synthesized according to Example 8.
- the appropriately sized size exclusion medium was Biogel P2 (Bio-Rad Laboratories, Hercules, CA), and the appropriately sized ultrafiltration membrane molecular weight cutoff was 3 kD. Because the starting NH 2 -B l-BOC2(Al,B29)-insulin material only possesses one free amine group at the Phe-Bl terminus, the Phe-Bl is the only site of insulin conjugation to the framework.
- the BOC protecting groups are removed by dissolving the lyophilized powder in 90% TF A/10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150 M NaCl.
- the pH was adjusted to between 7.0 and 8.0 using NaOH solution after which the material was passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution was then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to the desired level and stored at 4 C until needed.
- the final product (95% pure by HPLC) was found to have the desired MW of 6897 g/mol (LC-MS), representing a total of 3.0 AEM molecules conjugated per insulin, 99% of which were conjugated at the Phe-Bl site (N-terminal sequencing).
- Example 25 AEM-3-scaffold containing a terminal reactive aldehyde group and subsequent insulin conjugation at Bl using unprotected insulin a.
- TSPE functionalized with 3 AEM and 1 amino butyr aldehyde diethyl acetal (ABDA)
- This material is synthesized according to the method described in Example 22a using TSPE (Molecular Biosciences, Boulder, CO) as the multivalent activated ester scaffold and 4- aminobutyraldehyde diethyl acetal (Sigma Aldrich, St. Louis, MO) as the amine -bearing diethyl acetal.
- the Phe-Bl is the predominant site of insulin conjugation to the scaffold due to the fact that the Phe-Bl (pKa ⁇ 6.8) is the most reactive amine at pH 6.5.
- the lyophilized powder was dissolved in 25 mM HEPES pH 8.2 buffer containing 0.150 M NaCl. The pH was adjusted to between 7.0 and 8.0 using NaOH solution after which the material was then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to the desired level and stored at 4 C until needed.
- SDMB Succinimidyl-3,5-dimaleimidophenyl benzoate
- TAA triethylamine
- the solution is stirred rapidly for 10 minutes at room temperature.
- the amine-bearing drug is then dissolved separately in 7.5 ml of anhydrous DMSO at a concentration of 8.1 mM. Once dissolved, the entire SDMB solution is added dropwise over the course often minutes to the DMSO-drug solution followed by room temperature mixing for an additional two hours to ensure complete reaction.
- the resulting solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml.
- 6.0 mmol of an amine-containing ligand is dissolved in a 20 mM pH 8.2 HEPES buffered saline solution containing 0.150 M NaCl at a concentration of 450 mM.
- 6.6 mmol of iminothiolane (Sigma-Aldrich, St. Louis, MO) is added and allowed to react at pH 8.2 for 30 minutes at room temperature to convert the amine -terminal groups to terminal sulfhydryl groups.
- the resulting material is mixed with the 10 ml solution of drug- framework-di-maleimide conjugate produced in the previous step.
- the maleimide groups are allowed to react with the indicator-anolog sulfydryl groups at pH 8.2 for 2 hours to ensure complete reaction.
- the resulting solution is then purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml.
- this solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters SymmetryPrep C 18, 7 um column, 19 x 150 mm.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem.
- Example 27 Insulin-conjugated to aminoethyl saccharides using mixed framework chemistry
- the appropriately sized size exclusion medium is Biogel P2 (Bio-Rad Laboratories, Hercules, CA), and the appropriately sized ultrafiltration membrane molecular weight cutoff is 3 kD.
- the BOC protecting groups are removed by dissolving the lyophilized powder obtained according to Example 26 in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150 M NaCl.
- the pH is adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution is then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to approximately 58 U of insulin/ml (based on A280 measurements) and stored at 4 C until needed. Because the starting NH 2 -B l-BOC2(Al,B29)-insulin material only possesses one free amine group at the Phe-Bl terminus, the Phe-Bl will be the only site of insulin conjugation to the framework. This can be verified in each deprotected final product by N-terminal sequencing.
- a framework (8.3 mmol) containing at least one amino functionality and one or more terminal alkyne groups is taken into THF (40 mL), water (40 mL) and stirred into solution.
- An azidoethyl group-bearing drug (10.51 mmole) is added followed by copper sulfate (500 mg, 2.0 mmole) and sodium ascorbate (400 mg, 2.0 mmole).
- the resulting mixture is stirred at 55-60 C (oil bath) for 6 hours, cooled to room temperature, stirred overnight and concentrated under vacuum to one half volume and filtered thru a micro-glass filter.
- the filtrate is loaded on a resin column (Dowex 5Ow 50x4-100) and eluted with water (6x 75 mL) until neutral.
- the column is then eluted with 15% ammonium hydroxide (10x75 mL) and the fractions positive to ninhydrin are pooled and concentrated to a glassy foam.
- Example 29 Conjugates prepared using natural insulins from other species such as bovine and porcine
- Insulins from other species which contain at least one reactive amine functionality may be coupled using any of the methods used to conjugate human insulin.
- bovine and porcine insulin may be coupled using any of the methods used to conjugate human insulin.
- the molecular weights of the resulting conjugates made from bovine or porcine insulins will differ from those made from human insulin by the amounts listed in the following table.
- the resulting conjugates made from bovine or porcine insulin may have chromatographic peak retention times that differ slightly from those conjugates made from human insulin, due to the small differences in structures between the insulins.
- Example 30 Conjugates prepared with insulin analogs such as lispro, aspart, glulysine, glargine, and detemir
- All known insulin analogs which contain at least one reactive amine functionality may be coupled using any of the methods used to conjugate human insulin.
- lispro e.g., aspart, glulisine, glargine, and detemir
- the molecular weights of the resulting conjugates made from insulin analogs will differ from those made from human insulin by the amounts listed in the following table.
- the resulting conjugates made from insulin analogs may have chromatographic peak retention times that differ slightly from those conjugates made from human insulin, due to the small differences in structures between the insulins.
- insulin glulisine (which does not contain a B29 lysine, but rather a B3 lysine) will give predominantly B3 conjugates when using unprotected insulin glulisine. However, if Bl -insulin glulisine conjugates are desired, then BOC-(Al, B3)-insulin glulisine is first synthesized using the same protocol as BOC-(Al, B29)-human insulin as described in Example 8.
- Example 31 Conjugates prepared with peptidic insulin secretagogue conjugates Peptidic insulin secretagogues (e.g., without limitation GLP-I or the GLP-I analog exanitide) which contain an N-terminal amine functionality may be coupled using any of the methods used to conjugate insulin.
- Peptidic insulin secretagogues e.g., without limitation GLP-I or the GLP-I analog exanitide
- N-terminal amine functionality may be coupled using any of the methods used to conjugate insulin.
- This comparative example describes the synthesis of an insulin-glycogen conjugate according to U.S. Patent Application Publication No. 20070099820. Briefly, 1 gm of commercially available, unpurified oyster glycogen (Type II, Sigma-Aldrich, St. Louis, MO) is dissolved in deionized water at a concentration of 10 mg/ml. Solid CNBr is added to the resulting solution at a CNBr to glycogen mass ratio of 0.68 and the pH maintained constant at 10.7 +/- 0.2 using 3N sodium hydroxide (NaOH) solution. After stirring for 15 minutes, another equal mass of solid CNBr equal is added and the pH maintained constant at 10.7 +/- 0.2 while stirring for 45 minutes.
- unpurified oyster glycogen Type II, Sigma-Aldrich, St. Louis, MO
- 3N sodium hydroxide (NaOH) solution 3N sodium hydroxide
- Insulin is then added to the solution at an insulin to glycogen mass ratio of 0.60 and the pH adjusted to 9.15 using solid sodium bicarbonate.
- the solution is stirred overnight, ultrafiltered exhaustively against deionized water using a 50 kDa MWCO polyethersulfone disc membrane filter (Millipore, Bedford, MA), and lyophilized.
- the resulting powder is then purified from unconjugated insulin by gel filtration HPLC (Waters, Milford, MA) using a 1 M acetic acid mobile phase over a SuperdexTM 30 HiLoad 16/60 (Amersham Biosciences, Piscataway, NJ) packed column.
- the insulin glycogen fraction is then lyophilized to obtain the conjugate as a pure white powder.
- the resulting purified material contained 1.0 wt% of insulin per insulin-glycogen conjugate as measured using amino acid analysis (UCLA Biopolymers Laboratory, Los Angeles, CA).
- This example describes the differences between the RP-HPLC profiles of insulin- glycogen synthesized according to Example 32 and an exemplary conjugate synthesized according to the present invention.
- 100 ul of a 5 mg/ml solution of insulin-glycogen synthesized according to Example 32 and 100 ul of a 1 mg/ml solution of exemplary conjugate were injected separately onto a Waters Symmetry C8 5um column (4.6 mm x 250 mm), equilibrated with a 80% Water/20% Acetonitrile (CH3CN) mobile phase (each containing 0.1% TFA).
- CH3CN Water/20% Acetonitrile
- the exemplary conjugate used in this study was synthesized using TSAT-C6 as the framework, AEM as the ligand, and NH 2 -B l-BOC2(Al,B29)-insulin as the drug.
- the samples were eluted at 1.0 ml/minutes using the following gradient method: 0-5 minutes - constant 80% Water/20% CH3CN, 5-35 minutes - linear gradient to 50% Water/50% CH3CN.
- the elution profiles in Figure 1 show a single spike for the exemplary conjugate indicating a single chemically distinct species as compared to a broad and heterogenous elution profile for the insulin-glycogen conjugate, indicating a broad distribution of different chemical and/or molecular weight entitites.
- This example describes the difference in MW and MW distribution between the insulin- glycogen synthesized according to Example 32 and the same exemplary conjugate.
- the MW and MW distribution of the insulin-glycogen conjugate was determined by injecting 1 ml of a 25 mg/ml solution in pH 7 HEPES buffered saline onto an Ultrahydrogel Size Exclusion Column (Waters Corporation, Millford, MA) equilibrated with HEPES buffered saline. The column was eluted over the course of 30 minutes at 0.5 ml per min, and the elution profile was measured as an absorbance at 280 nm.
- dextran MW standards 1000, 5000, 12000, 25000, 50000, 80000, 150000, 270000, and 410000 g/mol (Sigma- Aldrich, St. Louis, MO) were injected to establish a calibration curve of MW versus retention time. Based on the calibration curve and the elution profile of the insulin-glycogen conjugate, the average MW was determined to be 500,000 g/mol with 67% of the distribution eluting over the broad range of 250,000 to 1,000,000 g/mol (data not shown). In contrast, the exemplary conjugate was determined to have just a single MW of exactly 6,730 g/mol as determined by LC/MS (HT Laboratories, San Diego, CA) (data not shown).
- This example compares the stability of an exemplary conjugate with that of unconjugated insulin under accelerated conditions according to the method described in Hinds et al. (Bioconj. Chem. 11 : 195-201 , 2000) at 37 C and a mechanical agitation rate of 150 strokes/min.
- RHI recombinant human insulin
- Holcombe et al. (Diabetes Care 27:1241-1242, 2004) describes that under non-accelerated conditions RHI stability is maintained for at least 30 days at room temperature (RT) and considerably longer when refrigerated.
- Figure 2 shows the results from the aggregation stability assay for RHI and two exemplary conjugates in pH 7.4 phosphate buffered saline (PBS) at 50 U/ml. In all cases, the % remaining in solution was determined by centrifuging (4500xg, 5 min) the solution at a given time point, measuring the A280 of the supernatant, and dividing the supernatant A280 by that of the original starting solution.
- Conjugate 1-1 (see Figure 45) was synthesized using TSAT-C6 as the framework, AEM as the ligand, and NH 2 -B 1 -BOC2(A1 ,B29)-insulin as the drug.
- Conjugate 1-16 (see Figure 45) was synthesized using TSPE as the framework, AEM as the ligand, and NH 2 -B 1-BOC2(A1,B29)- insulin as the drug.
- the conjugate Prior to and in parallel with the AST, the conjugate was also subjected to a 90-day non-accelerated stability test that included daily thermal cycling between 4°C and RT. At the conclusion of the parallel study, RP-HPLC demonstrated that the conjugate was still chemically and physically stable (data not shown). Further confirmation of the conjugate chemical stability in HEPES buffer is provided from the LC-MS data obtained before and after subjecting the conjugate to the AST.
- Conjugate 1-7 stored in HEPES has a MW of 6730 Da before and after the AST, demonstrating that both mannose residues, the conjugate framework, and insulin are all chemically unchanged and quite stable.
- all buffers used for storage, in vitro testing, and in vivo testing contain HEPES as the buffering agent.
- the present disclosure provides a composition comprising an inventive conjugate in a HEPES buffer.
- the LC-MS data greatly enhances FDA manufacturing regulatory compliance, as the LC- MS test can readily act as the chemical identity assay of the conjugate. Since the drug (e.g., insulin), conjugate framework, and conjugate all have discrete molecular weights, the resulting ligand ratio can be readily calculated by subtracting the conjugate framework MW from the conjugate MW to give the remaining mass due to the saccharide groups. In the case of conjugate 1-7, the mannose:insulin molar ratio is calculated as exactly 2.0.
- Example 37 Conjugate bioactivity versus RHI and dextran or glycogen conjugates
- Insulin-dextran bioactivity This comparative example evaluates the in vivo pharmacodynamic profile of subcutaneous Iy administered insulin-dextran (Sigma-Aldrich, MW ⁇ 70K). As shown below, the insulin-dextran conjugates synthesized according to U.S. Patent Publication No. 20040202719 act relatively slowly after subcutaneous injection, because the high MW of the conjugate polymer significantly hinders the absorption rate into systemic circulation. Insulin-dextran was synthesized using a modified cyanogen bromide (CNBr) coupling reaction.
- CNBr modified cyanogen bromide
- 56 mg of solid CNBr was added to the resulting solution and the pH was maintained at 10.7 ⁇ 0.2 using 5 N NaOH solution.
- another 56 mg of solid CNBr was added and the pH was maintained at 10.7 ⁇ 0.2 while stirring for 45 minutes.
- 300 mg of recombinant human insulin (RHI) was then added to the solution, and the pH was adjusted to 9.15 using solid sodium bicarbonate.
- the solution was stirred overnight, ultrafiltered exhaustively against DI water using a 1OK MWCO polyethersulfone disc membrane filter (Millipore, Bedford, MA), and lyophilized.
- the resulting powder was then purified from unconjugated insulin by high performance liquid chromatography (Waters, Milford, MA) using a 1 M acetic acid mobile phase over a SuperdexTM 75 packed column (Amersham Biosciences, Piscataway, NJ).
- the insulin-dextran fraction was then lyophilized to obtain the conjugate as a pure powder.
- the degree of insulin conjugation was 10 % (w/w) as determined by amino acid analysis (UCLA Biopolymers Laboratory, Los Angeles, CA).
- Insulin-glycogen bioactivity This example evaluates the in vivo pharmacodynamic profile of subcutaneously administered insulin-glycogen.
- the insulin-glycogen conjugate was synthesized according to
- This example evaluates and compares the in vivo pharmacodynamic profile of a subcutaneously administered exemplary conjugate and recombinant human insulin (RHI).
- the exemplary conjugate, 1-1 in Figure 45 was synthesized using TSAT-C6 as the scaffold, AEM as the indicator analog, and NH 2 -B l-BOC2(Al,B29)-insulin as the drug.
- This example describes and compares the serum insulin profiles obtained for a subcutaneously administered exemplary conjugate and recombinant human insulin (RHI).
- the exemplary conjugate, 1-1 in Figure 45 was synthesized using TSAT-C6 as the framework, AEM as the ligand, and NH 2 -B l-BOC2(Al,B29)-insulin as the drug.
- Example 39 PK and bioactivity of a B29-substituted version of the AEM-2-TSAT-C6- insulin conjugate
- This example describes the serum insulin and blood glucose depression profiles obtained for a subcutaneously administered exemplary conjugate.
- the exemplary conjugate, 1-7 in Figure 45 was synthesized using TSAT-C6 as the framework, AEM as the ligand, and recombinant human insulin as the drug (to produce a B29-substituted conjugate instead of a Bl -substituted conjugate as in Examples 37 and 38).
- Blood samples were collected via tail vein bleeding at 0 minutes and at 30, 60, 90, 120, 150, 180, 210, 240, and 300 minutes after injection. Blood glucose values were measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL). In addition, blood from each timepoint was centrifuged at 4 C to collect the serum. Serum insulin concentrations were subsequently measured with a commercially available ELISA kit (Human Insulin ELISA, Mercodia, Uppsala, Sweden).
- the pharmacokinetic profile for the B29-substituted conjugate is statistically indistinguishable from that of RHI as well as the Bl- substituted conjugate from Example 38, demonstrating that this conjugate is also rapidly absorbed into and eliminated from serum following a subcutaneous injection.
- Insulin lispro (HUMALOG®) is a rapid acting insulin analog in which the penultimate lysine and proline residues on the C-terminal end of the B-chain have been reversed. This modification blocks the formation of insulin multimers. Data from soluble recombinant human insulin (RHI) is also provided for comparison (see Example 38 and Figure 8).
- the exemplary conjugate, 1-1 in Figure 45 was synthesized using TSAT-C6 as the framework, AEM as the ligand, and NH 2 -B l-BOC2(Al,B29)-insulin as the drug.
- Blood samples were collected via tail vein bleeding at 0 minutes and at 30, 60, 90, 120, 150, 180, 210, 240, and 300 minutes after injection. Blood glucose values were measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL).
- This example compares the blood glucose profiles obtained for a series of subcutaneously administered exemplary conjugates.
- the exemplary conjugates were synthesized using TSAT- C6 as the framework, and NH 2 -B l-BOC2(Al,B29)-insulin as the drug.
- the ligand composition was varied across the conjugates to cover a range of affinities: AEM-2, AEBM-2, AETM-I- AEBM-I and AETM-2 (from lowest to higest affinity).
- the insulin conjugates are shown as 1-1, 1-2, 1-3, and 1-4 in Figure 45.
- Serum insulin concentrations were subsequently measured with a commercially available ELISA kit (Human Insulin ELISA, Mercodia, Uppsala, Sweden). A control was performed by injecting saline instead of the exogenous ligand after 15 minutes.
- Figure 18 shows the results obtained when alpha-methyl mannose was administered. Alpha-methyl mannose is a very high affinity saccharide which is capable of competing with AETM for binding to lectins such as Con A. As shown, the change in PK/PD profile that resulted from injection of alpha-methyl mannose was very significant (p ⁇ 0.05).
- RHI soluble recombinant human insulin
- the endogenous mannan-binding lectin (MBL) is known to bind saccharides with the following relative affinities: D-mannose, L-fucose > D-glucose, N-acetyl-D-glucosamine » D- galactose.
- L-fucose high affinity ligand
- D-glucose intermediate affinity ligand
- D-galactose low affinity ligand
- alpha-methyl mannose and L-fucose appear to exhibit the same kind of effect.
- D-glucose and D-galactose are compared in Figure 21.
- Galactose exhibits no effect as compared to saline.
- Glucose appears to exhibit a small effect; however, this is complicated by the fact that the exogenous insulin from the conjugate quickly lowers the glucose, so the sustained effect observed with alpha-methyl mannose and L-fucose does not occur.
- Example 42 In view of the data described in Example 42, we set out to determine whether the alpha- methyl mannose (a-MM) induced increase in serum conjugate concentration and bioactivity was a result of an increased rate of absorption from the subcutaneous injection site.
- the high affinity TSAT-C6-AETM-2 conjugate 1-2 was used for this experiment.
- the conjugate was diluted to a concentration of 5 U/ml (0.2 mg/ml insulin equivalent) using either a buffered saline solution or a buffered saline solution containing 1 M a-MM.
- Each solution was injected sub-Q at a dose of 5 U/kg into the back of the neck of each of three non-diabetic, male SD rats at time 0 and blood samples were collected via tail vein bleeding at 0 minutes and at 15, 30, 45, 60, 90, 120, 150, 180, 240, and 300 minutes after injection.
- Blood glucose values were measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL).
- blood from each timepoint was centrifuged at 4 C to collect the serum. Serum insulin concentrations were subsequently measured with a commercially available ELISA kit (Iso Insulin ELISA, Mercodia, Uppsala, Sweden).
- rats that received the a-MM conjugate solution also received an injection of buffered saline solution sub-Q at a separate hind quarter injection site at 15 minutes.
- Rats that received the saline conjugate solution also received an injection of a-MM solution sub-Q at a separate hind quarter injection site at 15 minutes.
- These 15-minute delayed injections were used to make sure that the amount of a-MM injected sub-Q with the conjugate solution would not raise the systemic concentration of a-MM high enough to invoke the kind of a-MM induced effects exhibited in Figure 18.
- IP a-MM injection delay time (min) Sample time points (min post injection) 15 15, 30, 45, 60, 90, 120, 150, 180, 240, 300, 360
- Example 45 Effect of a-MM on PK and bioactivity as a function of ligand affinity
- Example 42 we set out to determine the pharmacokinetic and pharmacodynamic behavior of conjugates synthesized using different saccharide ligands than the AETM ligand used in Example 42.
- the TSAT-C6 framework was used and the following conjugates were synthesized according to the methods described in Example 20 (note glucosamine-HCl or GA-HCl was purchased from Sigma- Aldrich (St. Louis, MO) and used without further purification):
- TSAT-C6-AEM-2 (B29) and TSAT-C6- GA-2 (B29) are shown in Figure 45 as conjugates 1-7 and 1-5, respectively.
- Example 42 The same type of experiments described in Example 42 were repeated for the conjugates described in the table above.
- Blood samples were collected via tail vein bleeding at 0 minutes and at 30, 60, 90, 120, 150, 180, 210, 240, and 300 minutes after the initial conjugate injection. Blood glucose values were measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL).
- Serum insulin concentrations were subsequently measured with a commercially available ELISA kit (ISO Insulin ELISA, Mercodia, Uppsala, Sweden). A control was performed by injecting saline instead of a-MM after 15 minutes.
- Figures 24 and 25 show the results obtained when a-MM was administered by IP injection 15 minutes after the sub-Q injection of 1-7 and 1-5, respectively.
- the increase in PK/PD profile that resulted from injection of a-MM was very significant (p ⁇ 0.05) for conjugate 1-7 when compared to the saline injection control group.
- the extent of the a- MM-induced increase in serum conjugate concentration was less than that obtained for the AETM -2 conjugates from Example 42.
- the 1-5 conjugate profile was unaffected by the a-MM injection, just like the results obtained for RHI in Figure 19.
- Example 46 Effect of a-MM on PK and bioactivity as a function of ligand valency
- Example 45 The same type of experiment described in Example 45 was repeated for the conjugates described in the table above.
- Blood samples were collected via tail vein bleeding at 0 minutes and at 30, 60, 90, 120, 150, 180, 210, 240, and 300 minutes after the initial conjugate injection. Blood glucose values were measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL).
- Serum insulin concentrations were subsequently measured with a commercially available ELISA kit (ISO Insulin ELISA, Mercodia, Uppsala, Sweden). A control was performed by injecting saline instead of a-MM after 15 minutes.
- Figures 26 and 27 show the results obtained when a-MM was administered by IP injection 15 minutes after the sub-Q injection of 1-8 and 1-9, respectively.
- the increase in PK/PD profile that resulted from injection of a-MM was very significant (p ⁇ 0.05) for 1-9 and less so for 1-8 when compared to the saline injection control group.
- the 1-9 conjugate exhibited approximately the same a-MM-induced PK profile as the 1-2 conjugate from Example 42, both of which were much more pronounced than that obtained from 1-8.
- Figures 28 and 29 show the results obtained when a-MM was administered by IP injection 15 minutes after the sub-Q injection of 1-10 and 1-11, respectively.
- the increase in PK/PD profile that resulted from injection of a-MM was very significant (p ⁇ 0.05) for 1-11 and slightly less so for 1-10 when compared to the saline injection control group.
- the I- 11 conjugate exhibited approximately the same a-MM-induced PK profile as the 1-2 conjugate from Example 42, both of which were slightly more pronounced than that obtained from 1-10.
- Example 44 The results obtained in Example 44 are consistent with the exemplary conjugates being eliminated from the body via a lectin dependent mechanism that can be disrupted by the presence of a competitive saccharide.
- All conjugates used in this study were synthesized according to the general methods described in Example 20.
- a sterile conjugate solution or control insulin was injected intravenously via one JV cannula, followed immediately by a chase solution of heparin-saline to ensure that all of the conjugate dose was administered into the animal.
- FIG. 30 shows the serum concentration of either RHI or TSAT-C6-AETM-2 conjugate, shown as 1-6 in Figure 45, as a function of time following the intravenous injection. Clearly, 1-6 is eliminated much more rapidly from serum than is RHI.
- C(t) A 0 EXP(-at) + B 0 EXP(-bt)
- t time
- C(t) the concentration in serum as a function of time
- a 0 is the first compartment concentration constant
- a is the first compartment exponential time constant
- B 0 is the second compartment concentration constant
- b is the second compartment exponential time constant.
- Example 48 In vivo half life/elimination rate under glucose infusion
- rat cannula was connected to a syringe infusion pump containing a sterile 50% w/v glucose solution.
- the pump infusion rate was adjusted by the experimenter to ensure that the blood glucose levels in the animal remained above 300 mg/dL at all times during the experiment. Blood glucose was measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL). In a typical experiment, it was found that the infusion pump rate required to keep the animals above 300 mg/dL was typically greater than 85 uL/min.
- Example 49 In vivo half life/elimination rate under a-MM infusion
- the pump infusion rate was adjusted by the experimenter, but was typically set at 85 uL/min.
- blood glucose was measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL). Blood from each timepoint was centrifuged at 4C to collect the serum, and serum insulin or serum conjugate concentrations were subsequently measured with a commercially available ELISA kit (Iso-Insulin ELISA, Mercodia, Uppsala, Sweden). Insulin or conjugate serum concentration vs.
- This fourth set of examples describes various experiments investigating the synthesis, formulation, and properties of some exemplary conjugates.
- Example 50 Long acting insulin conjugates using protamine, zinc, and other excipients
- PZI protamine zinc insulin
- Conjugates substituted with insulin at the Bl- terminus do not form amorphous or crystalline PZI formulations as readily, so we used B29- substituted conjugates prepared based on the methods of Example 20.
- the excipients used in these formulations comprise protamine, zinc, m-cresol, and salt all of which were obtained commercially from Sigma-Aldrich (St. Louis, MO).
- the concentrations of these components may be varied in order to obtain an optimally flat, sustained absorption rate.
- concentration of unmodified insulin helped stabilize the formulation.
- the concentration of unmodified insulin contained in the sample was varied to obtain an optimally flat, sustained absorption rate.
- the following recipe was used:
- the formulations were prepared after addition of the components in the order described in the table above, they were gently mixed for 30 minutes prior to in vivo testing.
- Blood samples were collected via tail vein bleeding at 0 minutes and at 30, 60, 90, 120, 150, 180, 210, 240, and 300 minutes after the initial conjugate injection.
- Blood glucose values were measured using commercially available test strips (Precision Xtra, Abbott Laboratories, Abbott Park, IL).
- blood from each timepoint was centrifuged at 4 C to collect the serum.
- Serum insulin concentrations were subsequently measured with a commercially available ELISA kit (Iso-Insulin ELISA, Mercodia, Uppsala, Sweden). According to the manufacturer's assay specifications, the Iso-Insulin ELISA is 71% cross-reactive with rat insulin.
- the serum samples were diluted by 10 ⁇ in order to minimize the amount of endogenous rat insulin detected in each sample but the possibility of rat insulin detection could not be completely ruled out. Therefore, the results are generally reported as "measured insulin,” which can consist of some amount of endogenous rat insulin in addition to the conjugate or RHI, depending on the experiment. Nevertheless, all samples collected in each of the following examples were treated identically and can be directly compared for differences in performance.
- the results shown in Figure 3 la-c demonstrate that as the protamine concentration in the formulation increases, the more protracted the resulting formulation and the more pronounced the measured increase in serum insulin profile after the four hour glucose injection.
- the IxP- IxZ formulation released a significant portion of the insulin conjugate payload over a short period of time immediately following the injection such that very little signal was detected after the IP glucose challenge.
- the 10xP-4xZ formulation released a low basal amount of insulin over the first four hours with no hypoglycemia and subsequently attained > 4x increase in measured insulin concentration immediately following the IP glucose injection.
- Example 1-6 synthesized according to the methods described in Example 20, was tested using the generalized formulation and in vivo protocol described in Example 50:
- the results shown in Figure 32a-b and 33a-b demonstrate that within experimental error, the concentration of zinc did not have a significant effect on the overall sustained release nature of the formulation or the glucose-responsive profile. In all cases, a statistically significant increase in measured insulin concentration was observed following the IP glucose injection.
- the higher protamine (1OxP) formulations released less conjugate over time than the lower protamine (4xP) formulations regardless of the zinc concentration.
- both 1OxP formulations transformed from an easily dispersible particulate solution into a sticky, agglomerated, two-phase solution. This did not happen with the corresponding 10xP-4xZ formulation.
- the 4xP-lxZ formulation was found to transform the same way as the 1 OxP- IxZ formulation whereas the 4xP-2xZ was relatively stable at room temperature for weeks. Therefore, the zinc concentration for a given protamine concentration can be adjusted to prepare easily dispersible formulations that are stable over long periods of time.
- the results shown in Figure 34a-b demonstrate that the presence of m-cresol maintains a more protracted formulation.
- the no cresol formulation releases a significant portion of the insulin conjugate payload over a short period of time immediately following the injection such that very little increase in measured insulin concentration was observed when challenged with IP glucose.
- the 4x cresol formulation releases a low basal amount of insulin over the first four hours with no hypoglycemia and subsequently attains a 3-4x increase in measured insulin concentration immediately following the IP glucose injection.
- Example 54 Effect of salt/isotonic agent concentration on long acting insulin conjugate performance
- Example 1-6 synthesized according to the methods described in Example 20, was tested using the generalized formulation and in vivo protocol described in Example 50:
- the results shown in Figure 35a-c demonstrate that the presence of salt in the formulation maintains a more protracted formulation.
- the no salt formulation released a significant portion of the insulin conjugate payload over the first four hours of the experiment such that very little increase in measured insulin concentration was observed when challenged with IP glucose.
- the 3.3x salt formulation released a low basal amount of conjugate over the first four hours with no hypoglycemia and subsequently attained a ⁇ 4x increase in measured insulin concentration immediately following the IP glucose injection.
- Example 55 Effect of unmodified insulin concentration on long acting insulin conjugate performance
- the purpose of this example was to demonstrate the effect of including different concentrations of unmodified insulin on the time action and glucose-responsive PK profile of an exemplary conjugate.
- this example 1-6 synthesized according to the methods described in Example 20, was tested using the generalized formulation and in vivo protocol described in Example 50:
- Example 56 Long acting insulin conjugates - Dose response effect
- Conjugate 1-6 synthesized according to the methods described in Example 20, was tested using the generalized formulation and in vivo protocol described in Example 50:
- the conjugate exhibited a flat PK profile until the glucose was injected.
- the increase in measured insulin concentration following the IP glucose challenge was dramatic and dose-dependent (compare data obtained with a 5 U/kg (left) and 15 U/kg (right) dose of conjugate). No hypoglycemia was observed at early or late time points.
- PK profile the following experiment was conducted.
- Serum insulin concentrations were subsequently measured with a commercially available ELISA kit (Iso-Insulin ELISA, Mercodia, Uppsala, Sweden).
- Example 60 Long acting conjugates in diabetics and non-diabetics
- the formulation was prepared using the following procedure:
- Example 61 Conjugation with fatty acid esters to generate long acting formulations
- insulin acylation with C14-myristic acid for example, leads to a soluble material with a flat, protracted time action profile.
- Bl -substituted TSAT-C6-AETM-2 (1-2) is synthesized according to the methods in Example 12. The material may then be lyophilized into a dry powder and used as the starting material in the following procedure.
- Myristic acid-NHS ester is dissolved at 60 mM in 1 ml of anhydrous DMSO followed by the addition of 400 ul (excess) of triethylamine (TEA). The solution is stirred rapidly for 10 minutes at room temperature. Conjugate 1-2 is then dissolved separately in 7.5 ml of anhydrous DMSO at a concentration of 8.1 mM. Once dissolved, the entire solution is added over the course of one minute to the myristic acid-NHS ester solution followed by room temperature mixing for an additional two hours to ensure complete reaction.
- TAA triethylamine
- the resulting solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters SymmetryPrep C 18, 7 um column, 19 x 150 mm.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes.
- the retention time of the desired peak will vary depending on the drug, framework, and ligand used.
- the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate whose identity may be verified by LC-MS (HT Laboratories, San Diego, CA).
- the protracted and saccharide-responsive PK/PD profile of the resulting conjugate may then be evaluated using the 4 hour IP glucose or a-MM conditions described in Examples 50 and 59.
- Example 62 Long-acting conjugates with insulin possessing a neutral isoelectric point
- the protracted and saccharide -responsive PK/PD profile of the resulting conjugate may then be evaluated using the 4 hour IP glucose or a-MM conditions described in Examples 50 and 59.
- each may be continuously infused intravenously, subcutaneously, or intraperitoneally using a pump delivery system.
- the sterile solution of conjugate at a known concentration typically 25-100 U/ml
- This rate is adjusted to the maximal level at which no hypoglycemia is observed in the subject.
- the glucose-responsive PK/PD profile may be evaluated.
- the pump method is advantageous in that no excipients are required to provide a steady input and absorption rate for the conjugates.
- This example describes a synthetic process for making a ZC-AEM-2 intermediate having the following chemical structure:
- the first phase of the process involved combining reagents ZlA and ZlB to produce intermediate Z2A as shown in the following reaction scheme:
- reaction solution was stirred at room temperature overnight. After 36 hours of reaction, (dimethylamino)pyridine (DMAP, Sigma-Aldrich, St. Louis, MO, 7.71 g) was added, and after 48 hours the reaction mixture was filtered with a Buchner funnel. The filtrate was kept at 4 C overnight and worked up the following day.
- DMAP dimethylaminopyridine
- Compound Z3B (Sigma-Aldrich, St. Louis, MO, 19.0 g) was dissolved in DMF (50 mL). The suspension was cooled to 0 C, after which time triethylamine (15.0 mL) was added to the solution. The temperature of the solution was maintained at 0 0 C for 0.75 hours. Next, the solution was charged with a solution of Compound Z3A (13.0 g) dissolved in DMF (24 mL) at 0 C, followed by HOBT (Sigma-Aldrich, St. Louis, MO, 15.9 g), DMF (50 mL), and DIC (Sigma- Aldrich, St. Louis, MO, 15.0 mL).
- the resulting solution was stirred for an additional hour at 0 C and then allowed to warm to room temperature and react overnight for an additional 18 hours.
- the reaction was recooled to 0 C, and N,N-diisopropylethylamine (DIPEA, Sigma- Aldrich, St. Louis, MO, 15 mL) was added and the resulting solution stirred for 0.5 hr until the pH of the solution was approximately 9.0.
- DIPEA N,N-diisopropylethylamine
- DIC 3.5 mL
- Ester Z4A (2.27 g) was dissolved in methanol (10 mL), and to this solution 5.0 mL of 1.0M sodium hydroxide solution was added at room temperature. The mixture was stirred at room temperature for 38 hours. At the end of this time, an additional 1.5 mL of 2.0M aqueous sodium hydroxide solution was added, and the mixture was stirred at room temperature for another 14 hours.
- reaction mixture was acidified with a 10% aqueous solution of HCl at 0 0 C.
- product was extracted with ethyl acetate (3 x 25 mL).
- ethyl acetate 3 x 25 mL.
- the combined organic layers were dried over magnesium sulfate, and then concentrated to dryness in vacuo overnight to yield Z5 A as a white solid (2.2 g).
- the fifth phase of the process involved combining intermediate Z5A with aminoethylmannose (AEM) to produce intermediate Z6A as shown in the following reaction scheme:
- Diacid compound Z5A (2.0 g), aminoethylmannose (1.46 g), O-(7-azabenzotriazol-l-yl)- N,N,N',N'-tetramethyl-uronium hexafluorophosphate (HATU, Sigma- Aldrich, St. Louis, MO, 2.7 g) were dissolved in dry DMF (80 mL) under nitrogen at 0 0 C. DIPEA (Sigma-Aldrich, St. Louis, MO, 3.0 mL) was added dropwise to the mixture at 0 0 C under a nitrogen atmosphere. The mixture was stirred for 1 hr at 0 0 C and then an additional 4 hr at room temperature.
- HATU O-(7-azabenzotriazol-l-yl)- N,N,N',N'-tetramethyl-uronium hexafluorophosphate
- the solution volume was concentrated to one third and filtered off excess unreacted DSS.
- the filtrate was further concentrated to approximately 3 mL of column and purified by silica gel chromatography (eluent: methylene chloride/methanol 20:1 to 4:1, then 3:1 to 1 :1). Collected fractions were concentrated and dried in vacuo to give 151 mg of purified product.
- This example describes a method for preparing a Bl -conjugated insulin from intermediate Z9A of Example 64.
- Compound Z9A was conjugated to insulin as follows. NH 2 - Bl-BOC2(Al,B29)-insulin synthesized according to Example 8 (0.167 g) was dissolved in dry DMSO (3 mL) at room temperature under nitrogen and stirred for 0.5 hours at room temperature. To this solution was added anhydrous triethylamine (0.013 mL) at room temperature under nitrogen.
- reaction mixture was thawed and placed onto a small packed column of ion exchange beads (SP Sephadex beads, Sigma-Aldrich, St. Louis, MO, isocratic conditions).
- the column was centrifuged briefly for 4 min at 1000 x g to purify the insulin conjugate (assessed by analytical HPLC).
- the collected fractions from the ion exchange column (6 mL) were added dropwise to dry acetone (30 mL) with stirring at 140 rpm for 10 min.
- the resulting suspension was poured into a 50 mL centrifuge tube which was spun for 10 min at 3500 x g. The clear supernatant was removed from the tubes, and the cake kept and set aside.
- the supernatant was added to another 30 mL of acetone to obtain a second crop of precipitate (after adding a few drops of 5N HCl), which was then centrifuged for 10 min at 3500 x g to obtain a second centrifuge cake.
- the combined cakes were dried in vacuo for 1 hour, to obtain a white solid (197 mg, 92% yield) at >98% purity by analytical HPLC.
- the insulin conjugate BOC groups were removed by the procedure set forth in Example 12 to obtain the biologically active insulin conjugate.
- the process described in this example has the advantage of producing a high yield, high purity insulin conjugate without requiring reverse phase HPLC.
- This example describes one method for preparing a B29-conjugated insulin from intermediate Z9 A of Example 64.
- Compound Z9 A is conjugated to insulin as follows. NH 2 - B29-BOC2(Al,Bl)-insulin synthesized according to Example 16 (0.167 g) is dissolved in dry DMSO (3 mL) at room temperature under nitrogen and stirred for 0.5 hours at room temperature. To this solution is added anhydrous triethylamine (0.013 mL) at room temperature under nitrogen.
- reaction mixture is thawed and placed onto a small packed column of ion exchange beads (SP Sephadex beads, Sigma-Aldrich, St. Louis, MO, isocratic conditions).
- the column is centrifuged briefly for 4 min at 1000 x g to purify the insulin conjugate (assessed by analytical HPLC).
- the collected fractions from the ion exchange column (6 mL) are added dropwise to dry acetone (30 mL) with stirring at 140 rpm for 10 min.
- the resulting suspension is poured into a 50 mL centrifuge tube which is spun for 10 min at 3500 x g. The clear supernatant is removed from the tubes, and the cake kept and set aside.
- the supernatant is added to another 30 mL of acetone to obtain a second crop of precipitate (after adding a few drops of 5N HCl), which is then centrifuged for 10 min at 3500 x g to obtain a second centrifuge cake.
- the combined cakes are dried in vacuo for 1 hour, to obtain a white solid.
- the insulin conjugate BOC groups are removed by the procedure set forth in Example 12 to obtain the biologically active insulin conjugate.
- This example describes another method for preparing a B29-conjugated insulin from intermediate Z9A of Example 64. Specifically, this alternative method involves directly coupling compound Z9A to unprotected insulin at the B29 epsilon amino group.
- Compound Z9A was dissolved at 53 mM in 1.0 ml of anhydrous DMSO followed by the addition of 0.4 ml (excess) of triethylamine (TEA). The solution was stirred rapidly for 5 minutes at room temperature.
- Recombinant human insulin (RHI) powder was then dissolved separately at 17.2 mM in 1 ml of a 0.1 M, pH 11 sodium carbonate buffer and the pH was subsequently adjusted to 10.8 with 1.0N sodium hydroxide. Once dissolved, the entire solution of Compound Z9A was added dropwise over the course of 10 minutes to the insulin/carbonate buffer solution. The solution was allowed to stir for an additional 15 minutes after the dropwise addition to ensure complete reaction.
- the resulting solution was then superdiluted by 10x into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution was first purified by size exclusion using Biogel P2 (Bio-Rad Laboratories, Hercules, CA) for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume was then concentrated using a 3 kDa ultrafiltration membrane to approximately 15 ml. This solution was further purified to obtain the desired product using preparative reverse phase HPLC on a Waters SymmetryPrep C 18, 7 um, 19 x 150 mm column.
- Buffer A was deionized water containing 0.1% TFA and Buffer B was acetonitrile containing 0.1% TFA.
- the column was equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution was injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes.
- the solution was rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate whose identity was verified by LC-MS (HT Laboratories, San Diego, CA).
- the final product (95% pure by HPLC) was found to have the desired MW of 6744 g/mol (LC-MS), representing a total of 2.0 AEM molecules conjugated per insulin, with greater than 85% of the conjugate molecules conjugated at the Lys-B29 site (as determined by N-terminal sequencing).
- Example 68 Long acting 1-17 conjugates
- the conjugate for this example was synthesized according to the methods described in Example 67.
- the following long-acting formulation was used for this conjugate:
- Example 69 Conjugates prepared from 2-aminoethyl alpha-L-fucopyranoside and 2- aminoethyl N-acetyl-beta-D-glucosamine and evaluation
- Example 42 demonstrates the ability of L-fucose to inhibit the presumed lectin pathway that leads to the increased PK profile of exemplary conjugates. It is also known that beta-linked N-acetyl glucosamine may also inhibit the pathways for which mannose and fucose are inhibitors (e.g. see Haurum et al. in Biochem. J. 293:873-878, 1993). This example describes how insulin conjugates such as the ones described above may be synthesized using 2- aminoethyl alpha-L-fucopyranoside or 2-aminoethyl N-acetyl-beta-D-glucosamine ligands.
- the PK of the resulting conjugates are tested in vivo for a-MM, L-fucose, or glucose- induced increases in PK/PD profiles following subcutaneous injection in rats according to the methods described in Example 42.
- the conjugates can also be formulated as sustained release formulations according to the methods in Examples 50-55 and subsequently evaluated for their protracted and glucose-responsive pharmacokinetics according to the 4 hour IP glucose injection protocol outlined in those same examples. Alternative methods of sustaining the release of these conjugates may also be employed such as those described in Examples 61-63.
- W is an insulin molecule
- the insulin molecule is selected from the group consisting of human insulin, porcine insulin, and bovine insulin. In certain embodiments, the insulin molecule is insulin glargine or insulin detemir. In certain embodiments, the insulin molecule includes three disulfide bridges.
- W is an insulin molecule
- the insulin molecule is selected from the group consisting of human insulin, porcine insulin, and bovine insulin. In certain embodiments, the insulin molecule is insulin glargine or insulin detemir. In certain embodiments, the insulin molecule includes three disulfide bridges.
- W is an insulin molecule
- the insulin molecule is selected from the group consisting of human insulin, porcine insulin, and bovine insulin. In certain embodiments, the insulin molecule is insulin glargine or insulin detemir. In certain embodiments, the insulin molecule includes three disulfide bridges.
- the present disclosure provides sustained release formulations that comprise a conjugate, wherein the formulation comprises protamine and zinc. It is to be understood that the present disclosure encompasses sustained release formulations with any one of the conjugates described herein (e.g., without limitation, any one of the conjugates of Figures 45, 49, 55, 60, 61, or 62).
- the formulation includes from about 1 to about 5 mg protamine/mg conjugate; and from about 0.1 to about 0.25 mg zinc/mg conjugate. In certain embodiments, the formulation includes protamine and zinc in a ratio (w/w) in the range of about 40:1 to about 10:1.
- the formulation further comprises an amount of unconjugated insulin molecule. In certain embodiments, the formulation comprises a molar ratio of conjugated insulin molecule to unconjugated insulin molecule in the range of about 25 : 1 to about 2:1. In certain embodiments, the formulation further comprises an antimicrobial preservative.
- the antimicrobial preservative is m-cresol. In certain embodiments, the formulation comprises from about 0.15 to about 0.35% v/v m-cresol.
- the formulation further comprises an isotonic agent.
- the isotonic agent is glycerol.
- the isotonic agent is NaCl.
- the formulation comprises from about 0.1 to about 0.2 M NaCl.
- the formulation comprises: protamine and zinc in a ratio (w/w) in the range of about 40:1 to about 10:1; a molar ratio of conjugated insulin molecule to unconjugated insulin molecule in the range of about 25:1 to about 2:1; about 0.15 to about 0.35% v/v m-cresol; and glycerol or from about 0.1 to about 0.2 M NaCl.
- the formulation comprises: about 3.6 mg protamine/mg conjugate; and about 0.2 mg zinc/mg conjugate.
- the formulation comprises: about 3.6 mg protamine/mg conjugate; about 0.2 mg zinc/mg conjugate; and a molar ratio of conjugated insulin molecule to unconjugated insulin molecule of about
- the formulation comprises: about 3.6 mg protamine/mg conjugate; about 0.2 mg zinc/mg conjugate; a molar ratio of conjugated insulin molecule to unconjugated insulin molecule of about 5:1; and about 0.2% v/v m-cresol.
- the formulation comprises: about 3.6 mg protamine/mg conjugate; about 0.2 mg zinc/mg conjugate; a molar ratio of conjugated insulin molecule to unconjugated insulin molecule of about 5:1; about 0.2% v/v m-cresol; and glycerol or about 0.15 M NaCl.
- Example 75 Insulin conjugation with multivalent activated esters in organic solvent (drug added first) to give Al-substituted insulin conjugates - general procedure
- Step 1 Insulin is dissolved in a 66:37 vohvol mixture of 100 mM sodium carbonate buffer (pH
- a framework containing N-terminal activated esters is dissolved at 174 mM in 1.267 ml of anhydrous DMSO followed by the addition of 100 ⁇ l (excess) of triethylamine (TEA). The solution is stirred rapidly for 10 minutes at room temperature.
- a 370 mM solution of ligand is prepared in an appropriate volume of dry DMSO. Once dissolved, enough solution is added to provide a number of reactive equivalents equal to three times the number of initial activated ester groups, N, minus one.
- the framework-ligand solution from Step 2 is added dropwise to the insulin solution in aliquots.
- the resulting reaction is monitored by HPLC. Aliquots are added until the B29-protected insulin is fully reacted to give the desired B29-protected, Al-framework/ligand, insulin-conjugate. Since the ligand-framework is often more hydrophilic than the insulin, the appearance of the desired product is signaled by a distinct shift to shorter HPLC retention times as compared to the B29- insulin (from Step 1).
- reaction solution is superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters C8, 7 um, 19 x 150 mm column.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes. The retention time of the desired peak will vary depending on the insulin, framework, and ligand used. Once collected, the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure mono-protected insulin- conjugate.
- the protecting group is then removed from the insulin-conjugate.
- the BOC groups are removed by dissolving the lyophilized powder obtained according to Step 3 in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150M NaCl.
- a protecting group other than BOC is present on the amine-bearing drug, then the appropriate deprotection conditions are employed instead of TFA/anisole.
- a listing of protection agents and deprotection conditions may be found in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M.
- the pH was adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution was then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to approximately 66 U of insulin/ml (based on A280 measurements) and stored at 4 C until needed. The identity of the final conjugate is verified by LC-MS (HT Laboratories, San Diego, CA).
- Example 75 is relevant not only to wild-type insulin, but also to insulin mutants as described herein. The following insulin-conjugates were prepared according to the procedure in Example
- insulin-conjugates can be prepared according to the procedure in Example 75.
- the insulin-conjugates are prepared using BOC-NHS as the protecting reagent.
- Example 76 Insulin conjugation with multivalent activated esters in organic solvent (drug added first) to give Al,B29-substituted insulin conjugates -
- Insulin is dissolved in 1.5 niL of 100 mM sodium carbonate buffer (pH 11) at a concentration of 17.2 mM. Solution pH is maintained at ⁇ 11 by addition of 0.1 M NaOH as needed. Once the insulin is dissolved, small aliquots of the framework-ligand solution are added to the insulin solution. The pH is monitored throughout the process and is maintained between 10.2-11.0 through the addition of 0.1M sodium hydroxide. The reaction is monitored by reverse- phase HPLC.
- the solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters C 8, 7 um, 19 x 150 mm column.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes.
- the retention time of the desired peak will vary depending on the insulin, framework, and ligand used.
- the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate.
- the identity of the final conjugate is verified by LC-MS (HT Laboratories, San Diego, CA).
- the Al, B29 sites of conjugation are confirmed by N-terminal sequencing (Western Analytical, St. Louis, MO), which reveals > 95% of the Phe-Bl -chain terminus present and ⁇ 5% of the Gly A1 -chain terminus present due to the substitution of Gly A1 with the ligand- containing framework.
- Example 76 is relevant not only to wild-type insulin, but also to insulin mutants as described herein.
- Example 77 Insulin conjugation with multivalent activated esters in organic solvent (drug added first) to give Al,Bl-substituted insulin conjugates
- a framework containing N-terminal activated esters is dissolved at 147 mM in 2.5 ml of anhydrous DMSO followed by the addition of 1.0 mL (excess) of triethylamine (TEA). The solution is stirred rapidly for 10 minutes at room temperature.
- framework-ligand solution Aliquots of framework- ligand solution are added until the HPLC chromatogram shows that substantially all of the B29- BOC-insulin has been reacted and that a substantial portion of the reaction mixture has been converted to a small portion of mono-reacted B29-BOC-insulin/framework/ligand conjugate and the majority product is di-reacted B29-BOC-insulin/framework/ligand conjugate.
- the framework-ligand construct will be more hydrophilic than the B29-BOC-insulin, causing the mono-conjugated and di-conjugated B29-BOC-insulin-conjugates to elute at HPLC retention times shorter than that of the unmodified B29-BOC-insulin.
- the solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters C8, 7 um, 19 x 150 mm column.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes. The retention time of the desired peak will vary depending on the insulin, framework, and ligand used.
- the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate. Step 4 In all cases the protecting group is then removed from the conjugate. In cases where a
- BOC protecting group is used in Step 1, the BOC groups are removed by dissolving the lyophilized powder obtained according to Step 3 in 90% TFA/ 10% anisole for one hour at 4 C followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150M NaCl.
- a protecting group other than BOC is present on the amine-bearing drug, then the appropriate deprotection conditions are employed instead of TFA/anisole.
- a listing of protection agents and deprotection conditions may be found in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M.
- the pH was adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution was then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to approximately 66 U of insulin/ml (based on A280 measurements) and stored at 4 C until needed. The identity of the final conjugate is verified by LC-MS (HT Laboratories, San Diego, CA).
- Example 77 is relevant not only to wild-type insulin, but also to insulin mutants as described herein.
- Conjugate II-5 was prepared according to the procedure in Example 77 using BOC-NHS as the protecting reagent.
- Example 78 Insulin conjugation with multivalent activated esters in organic solvent (drug added first) to give Bl,B29-substituted insulin conjugates
- Al-BOC-insulin can be prepared using the procedure in Example 8 but reacting with fewer equivalents of the BOC reagent in order to yield a distribution of Al,B29-diBOC-insulin, Al-BOC-insulin, and B29-BOC-insulin products.
- Al-BOC-insulin can be isolated by RP-HPLC and confirmed by N-terminal sequencing.) Once the Al-BOC-insulin is dissolved, small aliquots of the framework-ligand solution are added to the Al-BOC-insulin solution. The reaction is monitored by reverse-phase HPLC. Aliquots of framework-ligand solution are added until the HPLC chromatogram shows that substantially all of the unmodified Al-BOC-insulin has been reacted and that a substantial portion of the reaction mixture has been converted to a small portion of mono-conjugated Al-BOC-insulin/framework/ligand conjugate and the majority product is di-conjugated Al-BOC-insulin/framework/ligand conjugate.
- the framework-ligand construct will be more hydrophilic than the Al-BOC-insulin, causing the mono and di-substituted Al-BOC-insulin-conjugates to elute at HPLC retention times shorter than that of the unmodified Al-BOC-insulin.
- the HPLC peak of the desired product, the di-substituted Al-BOC-insulin-conjugate will appear at a retention time that is shorter than that of the mono-substituted Al-BOC-insulin-conjugate.
- Step 3 Once the Al-BOC-insulin has been sufficiently reacted with framework ligand as described in Step 2, the solution is then superdiluted by 1Ox into a 20 mM pH 5.0 HEPES buffered saline solution containing 0.150 M NaCl followed by pH adjustment with dilute HCl to a final pH of 8.0.
- the aqueous solution is first purified by size exclusion using an appropriate solid phase for the desired separation of conjugated and unconjugated materials.
- the solution passing through the column void volume is then concentrated using an appropriately sized ultrafiltration membrane to approximately 10 ml. This solution is further purified to obtain the desired product using preparative reverse phase HPLC on a Waters C8, 7 um, 19 x 150 mm column.
- Buffer A is deionized water containing 0.1% TFA and Buffer B is acetonitrile containing 0.1% TFA.
- the column is equilibrated at 15 ml/minutes with a 80%A/20%B mobile phase using a Waters DeltraPrep 600 sytem. Approximately 5 ml of the crude solution is injected onto the column over the course of 2 minutes at a flow rate of 15 ml/minutes after which a linear gradient is employed from 80%A/20%B to 75%A/25%B over the next 5 minutes followed by a slower linear gradient from 75%A/25%B to 62%A/38%B over the next 22 minutes. The retention time of the desired peak will vary depending on the drug, framework, and ligand used. Once collected, the solution is rotovapped to remove acetonitrile and lyophilized to obtain pure conjugate. Step 4
- the protecting group is then removed from the conjugate.
- the BOC groups are removed by dissolving the lyophilized powder obtained according to Step 3 in 90% TFA/ 10% anisole for one hour at 4 C. If a protecting group other than BOC is present on the amine-bearing drug, then the appropriate deprotection conditions are employed instead of TFA/anisole.
- a listing of protection agents and deprotection conditions may be found in Protecting Groups in Organic Synthesis, T. W. Greene and P. G. M. Wuts, 3 rd edition, John Wiley & Sons, 1999, as described in the Definitions section.
- the deprotection step is followed by 1Ox superdilution in 25 mM HEPES pH 8.2 buffer containing 0.150M NaCl.
- the pH is adjusted to between 7.0 and 8.0 using NaOH solution after which the material is passed through a Biogel P2 column to remove anisole, BOC and other low MW byproducts of deprotection, as well as any other contaminating salts.
- the deprotected, purified aqueous conjugate solution is then concentrated using Amicon 3K membranes (Millipore, Billerica, MA) to approximately 66 U of insulin/ml (based on A280 measurements) and stored at 4 C until needed. The identity of the final conjugate is verified by LC-MS (HT Laboratories, San Diego, CA).
- the Bl site of conjugation is confirmed by N-terminal sequencing (Western Analytical, St. Louis, MO), which reveals > 95% of the GIy-Al -chain terminus present and ⁇ 5% of the Phe-Bl -chain terminus present due to the substitution of Phe- Bl with the ligand-containing framework.
- Example 78 is relevant not only to wild-type insulin, but also to insulin mutants as described herein.
- the following insulin-conjugates can be prepared according to the procedure in Example
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KR1020147001684A KR101635689B1 (en) | 2009-01-28 | 2010-01-27 | Conjugate based systems for controlled drug delivery |
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BRPI1007457-0A BRPI1007457A2 (en) | 2009-01-28 | 2010-01-27 | Conjugate, extended release formulation, and pump distribution system. |
CN201080015055XA CN102365025A (en) | 2009-01-28 | 2010-01-27 | Conjugate based systems for controlled drug delivery |
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US15/040,004 US20160193351A1 (en) | 2009-01-28 | 2016-02-10 | Conjugate based systems for controlled drug delivery |
US15/680,262 US10398781B2 (en) | 2009-01-28 | 2017-08-18 | Conjugate based systems for controlled drug delivery |
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