AU2001286599A1 - Active agent delivery systems and methods for protecting and administering active agents - Google Patents
Active agent delivery systems and methods for protecting and administering active agentsInfo
- Publication number
- AU2001286599A1 AU2001286599A1 AU2001286599A AU2001286599A AU2001286599A1 AU 2001286599 A1 AU2001286599 A1 AU 2001286599A1 AU 2001286599 A AU2001286599 A AU 2001286599A AU 2001286599 A AU2001286599 A AU 2001286599A AU 2001286599 A1 AU2001286599 A1 AU 2001286599A1
- Authority
- AU
- Australia
- Prior art keywords
- active agent
- composition
- polypeptide
- amino acid
- glu
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Description
ACTIVE AGENT DELIVERY SYSTEMS AND METHODS FOR PROTECTING AND ADMINISTERING ACTIVE AGENTS
Field of the Invention
The present invention relates to active agent delivery systems and, more specifically, to compositions that comprise polypeptides covalently attached to active agents and methods for protecting and administering active agents.
Background of the Invention
Active agent delivery systems are often critical for the effective delivery of a biologically active agent (active agent) to the appropriate target. The importance of these systems becomes magnified when patient compliance and active agent stability are taken under consideration. For instance, one would expect patient compliance to increase markedly if an active agent is administered orally in lieu of an injection or another invasive technique. Increasing the stability of the active agent, such as prolonging shelf life or survival in the stomach, will assure dosage reproducibility and perhaps even reduce the number of dosages required which could improve patient compliance.
Absorption of an orally administered active agent is often blocked by the harshly acidic stomach milieu, powerful digestive enzymes in the GI tract, permeability of cellular membranes and transport across lipid bilayers. Incorporating adjuvants such as resorcinol, surfactants, polyethylene glycol (PEG) or bile acids enhance permeability of cellular membranes. Microencapsulating active agents using protenoid microspheres, liposomes or polysaccharides have been effective in abating enzyme degradation of the active agent. Enzyme inhibiting adjuvants have also been
used to prevent enzyme degradation. Enteric coatings have been used as a protector of pharmaceuticals in the stomach.
Active agent delivery systems also provide the ability to control the release of the active agent. For example, formulating diazepam with a copolymer of glutamic acid and aspartic acid enables a sustained release of the active agent. As another example, copolymers of lactic acid and glutaric acid are used to provide timed release of human growth hormone. A wide range of pharmaceuticals purportedly provide sustained release through microencapsulation of the active agent in amides of dicarboxylic acids, modified amino acids or thermally condensed amino acids. Slow release rendering additives can also be intermixed with a large array of active agents in tablet formulations.
Each of these technologies imparts enhanced stability and time-release properties to active agent substances. Unfortunately, these technologies suffer from several shortcomings. Incorporation of the active agent is often dependent on diffusion into the microencapsulating matrix, which may not be quantitative and may complicate dosage reproducibility. In addition, encapsulated drugs rely on diffusion out of the matrix, which is highly dependant on the water solubility of the active agent. Conversely, water-soluble microspheres swell by an infinite degree and, unfortunately, may release the active agent in bursts with little active agent available for sustained release. Furthermore, in some technologies, control of the degradation process required for active agent release is unreliable. For example, an enterically coated active agent depends on pH to release the active agent and, as such, is difficult to control the rate of release.
In the past, use has been made of amino acid side chains of polypeptides as pendant groups to which active agents can be attached. These technologies typically require the use of spacer groups between the amino acid pendant group and the active agent. The peptide-drug conjugates of this class of drug delivery system rely on enzymes in the bloodstream for the release of the drug and, as such, are not used for oral administration. Examples of timed and targeted release of injectable or subcutaneous pharmaceuticals include: linking of norethindrone, via a hydroxypropyl spacer, to the gamma carboxylate of polyglutamic acid; and linking of nitrogen mustard, via a peptide spacer, to the gamma carbamide of polyglutamine. Dexamethasone has been covalently attached directly to the beta carboxylate of polyaspartic acid without a spacer group. This prodrug formulation was designed as a colon-specific drug delivery system where the drug is released by bacterial hydrolytic enzymes residing in the large intestines. The released dexamethasone active agent, in turn, was targeted to treat large bowel disorders and was not intended to be absorbed into the bloodstream. Yet another technology combines the advantages of covalent drug attachment with liposome formation where the active ingredient is attached to highly ordered lipid films (known as HARs) via a peptide linker. Thus, there has been no drug delivery system, heretofore reported, that incorporates the concept of attaching an active1 ingredient to a polypeptide pendant group with its targeted delivery into the bloodstream via oral administration.
It is also important to control the molecular weight, molecular size and particle size of the active agent delivery system. Variable molecular weights have unpredictable diffusion rates and pharmacokinetics. High molecular weight carriers are digested slowly or late, as in the case of naproxen-linked dextran, which is digested almost exclusively in the colon by bacterial enzymes. High molecular
weight microspheres usually have high moisture content which may present a problem with water labile active ingredients. Particle size not only becomes a problem with injectable drugs, as in the HAR application, but absorption through the brush-border membrane of the intestines is limited to less than 5 microns.
Summary of the Invention
The present invention provides covalent attachment of active agents to a polymer of peptides or amino acids. The invention is distinguished from the above mentioned technologies by virtue of covalently attaching the active agent, which includes, for example, pharmaceutical drugs and nutrients, to the N-terminus, the C- terminus or directly to the amino acid side chain of an oligopeptide or polypeptide, also referred to herein as a carrier peptide. In certain applications, the polypeptide will stabilize the active agent, primarily in the stomach, through conformational protection. In these applications, delivery of the active agent is controlled, in part, by the kinetics of unfolding of the. carrier peptide. Upon entry into the upper intestinal tract, indigenous enzymes release the active ingredient for absorption by the body by selectively hydrolyzing the peptide bonds of the carrier peptide. This enzymatic action introduces a second order sustained release mechanism.
The invention provides a composition comprising a polypeptide and an active agent covalently attached to the polypeptide. Preferably, the polypeptide is (i) an oligopeptide, (ii) a homopolymer of one of the twenty naturally occurring amino acids (L or D isomers), or an isomer, analogue, or derivative thereof, (iii) a heteropolymer of two or more naturally occurring amino acids (L or D isomers), or an isomer, analogue, or derivative thereof, (iv) a homopolymer of a synthetic amino acid, (v) a
heteropolymer of two or more synthetic amino acids or (vi) a heteropolymer of one or more naturally occurring amino acids and one or more synthetic amino acids.
The active agent preferably is covalently attached to a side chain, the N- terminus or the C-terminus of the polypeptide. In a preferred embodiment, the active agent is a carboxylic acid and is covalently attached to the N-terminus of the polypeptide. In another preferred embodiment, the active agent is an amine and is covalently attached to the C-terminus of the polypeptide. In another preferred embodiment, the active agent is an alcohol and is covalently attached to the C- terminus of the polypeptide. In yet another preferred embodiment, the active agent is an alcohol and is covalently attached to the N-terminus of the polypeptide.
The composition of the invention can also include one or more of a microencapsulating agent, an adjuvant and a pharmaceutically acceptable excipient.
The microencapsulating agent can be selected from polyethylene glycol (PEG), an amino acid, a sugar and a salt. When an adjuvant is included in the composition, the adjuvant preferably activates an intestinal transporter.
Preferably, the composition of the invention is in the form of an ingestable tablet, an intravenous preparation or an oral suspension. The active agent can be conformationally protected by folding of the polypeptide about the active agent. In another embodiment, the polypeptide is capable of releasing the active agent from the composition in a pH-dependent manner.
The invention also provides a method for protecting an active agent from degradation comprising covalently attaching the active agent to a polypeptide.
The invention also provides a method for controlling release of an active agent from a composition wherein the composition comprises a polypeptide, the method comprising covalently attaching the active agent to the polypeptide.
The invention also provides a method for delivering an active agent to a patient, the patient being a human or a non-human animal, comprising administering to the patient a composition comprising a polypeptide and an active agent covalently attached to the polypeptide. In a preferred embodiment, the active agent is released from the composition by an enzyme-catalyzed release. In another preferred embodiment, the active agent is released in a time-dependent manner based on the pharmacokinetics of the enzyme-catalyzed release. In another preferred embodiment, the composition further comprises a microencapsulating agent and the active agent is released from the composition by dissolution of the microencapsulating agent. In another preferred embodiment, the active agent is released from the composition by a pH-dependent unfolding of the polypeptide. In another preferred embodiment, the active agent is released from the composition in a sustained release. In yet another preferred embodiment, the composition further comprises an adjuvant covalently attached to the polypeptide and release of the adjuvant from the composition is controlled by the polypeptide. The adjuvant can be microencapsulated into a carrier peptide-drug conjugate for biphasic release of active ingredients.
The invention also provides a method for preparing a composition comprising a polypeptide and an active agent covalently attached to the polypeptide. The method comprises the steps of:
(a) attaching the active agent to a side chain of an amino acid to form an active agent/amino acid complex;
(b) forming an active agent/amino acid complex N-carboxyanhydride (NCA) from the active agent/amino acid complex; and
(c) polymerizing the active agent/amino acid complex N-carboxyanhydride (NCA). In a preferred embodiment, the active agent is a pharmaceutical agent or an adjuvant. In another preferred embodiment, steps (a) and (b) are repeated prior to step (c) with a second active agent. When steps (a) and (b) are repeated prior to step (c) with a second agent, the active agent and second active agent can be copolymerized in step (c). In another preferred embodiment, the amino acid is glutamic acid and the active agent is released from the glutamic acid as a dimer upon a hydrolysis of the polypeptide and wherein the active agent is released from the glutamic acid by coincident intramolecular transamination. In another preferred embodiment, the glutamic acid is replaced by an amino acid selected from the group consisting of aspartic acid, arginine, asparagine, cysteine, lysine, threonine, and serine, and wherein the active agent is attached to the side chain of the amino acid to form an amide, a thioester, an ester, an ether, a urethane, a carbonate, an anhydride or a carbamate. In yet another preferred embodiment, the glutamic acid is replaced by a synthetic amino acid with a pendant group comprising an amine, an alcohol, a sulfhydryl, an amide, a urea, or an acid functionality.
It is to be understood that both the foregoing general description and the following detailed description are exemplary, but are not restrictive, of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is best understood from the following detailed description when read in connection with the accompanying drawing. Included in the drawing are the following figures.
Fig. 1 illustrates an acid active agent/N-terminus scheme of the invention.
Fig. 2 illustrates an amine active agent/C-terminus scheme of the invention.
Fig. 3 illustrates an alcohol active agent/N-terminus scheme of the invention.
Fig. 4 illustrates an alcohol active agent/glutamic acid dimer preparation and conjugation scheme of the invention.
Fig. 5 illustrates a mechanism of alcohol active agent from glutamic acid dimer scheme.
Fig. 6 illustrates the in situ digestion of polythroid in intestinal epithelial cell cultures.
Fig. 7 illustrates basolateral T4 concentrations.
Fig. 8 illustrates the polythroid concentration of basal versus basolateral.
Fig. 9 illustrates T4 analysis in gastric simulator versus intestinal simulator.
Fig. 10 illustrates T3 analysis in gastric simulator versus intestinal simulator.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides several benefits for active agent delivery. First, the invention can stabilize the active agent and prevent digestion in the stomach. In addition, the pharmacologic effect can be prolonged by delayed release of the active agent. Furthermore, active agents can be combined to produce synergistic effects. Also, absorption of the active agent in the intestinal tract can be enhanced. The invention also allows targeted delivery of active agents to specifics sites of action.
The composition of the invention comprises a polypeptide and an active agent covalently attached to the polypeptide. Acive agents may be selected from the list in TABLE 1, either alone or in combination with other agents on the list.
TABLE 1 abacavir sulfate abarelix acarbose
Acetaminophen
Acetaminophen; Codeine phosphate
Acetaminophen; Propoxyphene napsylate
Acetylsalicylic acid
Acitretin activated protein C
Acyclovir adefovir dipivoxil adenosine
Adrenocorticotrophic hormone
Albuterol alendronate sodium
Allopurinal alpha 1 proteinase inhibitor
Alprazalom
alprostadil altinicline amifostine Amiodarone
Amitriptyline HCL amlodipine besylate amlodipine besylate; benazepril hcl
Amoxicillin amoxicillin; ciavuianate potassium amprenavir anagrelide hydrochloride anaritide anastrozole antisense oligonucleotide aripiprazole
Astemizole
Atenolol atorvastatin calcium atovaquone avasimibe
Azathioprine azelastine hydrochloride
Azithromycin dihydrate
Baclofen befloxatone benazepril hydrochloride
Benzatropine Mesylate
Betamethasone bicalutamide
Bisoproloi/Hydrochlorothiazide bosentan
Bromocriptine
Bupropion hydrochloride
Buspirone
Butorphanol tartrate cabergoline caffiene calcitriol candesartan cilexetil candoxatril capecitabine
Captopril carbamazepine
Carbidopa/Levodopa carboplatin
Carisoprodol
carvedilol caspofungin
Cefaclor
Cefadroxil; Cefadroxil hemihydrate
Cefazolin sodium
Cefdinir
Cefixime
1555; 1555U88
Cefotaxime sodium
Cefotetan disodium
Cefoxitin sodium
Cefpodoxime proxetil
Cefprozil
Ceftazidime Ceftibuten dihydrate 264W94 Cefuroxime axetil
Cefuroxime sodium celecoxib
Cephalexin cerivastatin sodium cetirizine hydrochloride
Chlorazepate Depot
Chlordiazepoxide ciclesonide cilansetron
Cilastatin sodium; Imipenem cilomilast
Cimetidine ciprofloxacin cisapride cisatracurium besylate cisplatin citalopram hydrobromide clarithromycin
Clomipramine
Clonazepam
Clonidine HCL clopidogrel bisulfate
4030W92
clorpheniramine tannate Clozapine
Colestipol HCL conivaptan
Cyclobenzaprine HCL Cyclophosphamide Cyclosporine dalteparin sodium dapitant desmopressin acetate
Desogestrel; ethinyl estradiol
Dextroamphetamine sulfate dextromethorphan
Diazepam
ABT 594
Diclofenac sodium diclofenac sodium, misoprostol
Dicyclomine HCL didanosine
Digoxin diltiazem hydrochloride Dipyridamole
divalproex sodium d-methylphenidate dolasetron mesylate monohydrate donepezil hydrochloride
Dopamine/D5W
Doxazosin doxorubicin hydrochloride duloxetine dutasteride ecadotril ecopipam edodekin alfa (lnterleukin-12) efavirenz
ABT 773 emivirine
Enalapril enapril maleate, hyd roch lo roth iazide
eniluracil enoxaparin sodium epoetin alfa recombinant eptifibatide
Ergotamine Tartrate
Erythromycin
ALT 711 esatenolol
Esterified estrogens;
,Methyltestosterone
Estrogens, conjugated
Estrogens, conjugated; medroxyprogesterone acetate
Estropipate etanercept ethinyl estradiol/norethindrone
BMS CW 189921
Ethinyl estradiol; Ethynodiol diacetate
Ethinyl estradiol; Levonorgestrel
Ethinyl estradiol; Norethindrone
Ethinyl estradiol; Norethindrone acetate
Ethinyl estradiol; Norgestimate
Ethinyl estradiol; Norgestrel
Etidronate disodium
Etodolac
Etoposide etoricoxib exendin-4 famciclovir
Famotidine
Felodipine fenofibrate fenretinide
Fentanyl fexofenadine hydrochloride filgrastim SD01 finasteride flecainide acetate fluconazole
Fludrocortisone acetate flumazenil Fluoxetine Flutamide
fluvastatin Fluvoxamine maleate follitropin alfa/beta
Formoterol
Fosinopril fosphenytoin sodium
Furosemide
Gabapentin gadodiamide gadopentetate dimeglumine gadoteridol ganaxolone ganciclovir gantofiban gastrin CW17 immunogen gemcitabine hydrochloride
Gemfibrozil
Gentamicin Isoton gepirone hydrochloride glatiramer acetate glimepiride
Glipizide
Glucagon HCL
Glyburide granisetron hydrochloride
Haloperidal
BMS 284756
Hydrochlorothiazid
Hydrochlorothiazide; Triamterene
Hydromorphone HCL
Hydroxychioroquine sulfate
Ibuprofen
Idarubicin HCL ilodecakin ilomastat imiglucerase
Imipramine HCL indinavir sulfate infliximab insulin lispro interferon alfacon-1 interferon beta-1a
interleukin-2 iodixanol
iopromide loxaglate meglumine; loxaglate sodium
Ipratropium
Irbesartan irinotecan hydrochloride
Isosorbide Dinitrate
Isotretinoin
Isradipine itasetron
Itraconazole
Ketoconazoje
Ketoprofen
Ketorolac
Ketotifen
Labetalol HCL lamivudine lamivudine; zidovudine lamotrigine lansoprazole lansoprazole, amoxicillin, clarithromycin leflunomide lesopitron
Leuprolide acetate levocamitine levocetirizine
Levofloxacin
Levothyroxine lintuzumab
Lisinopril lisinopril; hydrochlorothiazide
CS 834
Loperamide HCL
Loracarbef loratadine
Lorazepam losartan potassium losartan potassium; hydrochlorothiazide
Lovastatin marimastat mecasermin
Medroxyprogesterone Acetate mefloquine hydrochloride megestrol acetate
CVT CW124
Mercaptopurine
Meropenem
mesalamine mesna
Metaxalone
Metfomin
EM 800
Methylphenidate HCL
Methylprednisolone Acetate
FK 463
Metolazone metoprolol succinate
MK 826
Metronidazole milrinone lactate
Minocycline HCL mirtazapine
Misoprostol mitiglinide mitoxantrone hydrochloride mivacurium chloride modafinil moexepril hydrochloride montelukast sodium
Morphine Sulfate Mycophenolate mofetil nabumetone
Nadolol
Naproxen sodium naratriptan hydrochloride nefazodone hydrochloride nelarabine nelfinavir mesylate nesiritide nevirapine nifedipine nimodipine nisoldipine nitrofurantoin, nitrofurantoin, macrocrystalline
Nitroglycerin nizatidine norastemizole Norethindrone norfloxacin Nortriptyline HCL octreotide acetate
Oxycodone/APAP ofloxacin olanzapine
Omeprazole ondansetron hydrochloride oprelvekin orlistat
Orphenadrine citrate
Oxaprozin
Oxazepam oxybutynin chloride
Oxycodone HCL
GM 611
M-CSF pagoclone palivizumab pamidronate disodium paricalcitrol paroxetine hydrochloride pemetrexed
Pemoline penicillin V pentosan polysulfate sodium
Pentoxifylline
Pergolide
NE 0080
Phenobarbital
Phenytoin sodium pioglitazone hydrochloride
Piperacillin sodium pleconaril poloxamer CW188 posaconazole
NN 304 pramipexole dihydrochloride pravastatin sodium
Prednisone pregabalin
Primidone prinomastat
Prochlorperazine maleate
Promethazine HCL
PD 135158
Propoxyphene-N/APAP
Propranolol HCL prourokinase quetiapine fumarate quinapril hydrochloride rabeprazole sodium raloxifine hydrochloride
Ramipril
Ranitidine ranolazine hydrochloride relaxin remacemide repaglinide repinotan ribavirin+peginterferon alfa-2b riluzole
Rimantadine HCL risperidone ritonavir rizatriptan benxoate rocuronium bromide rofecoxib ropinirole hydrochloride rosiglitazone maleate
Goserelin rubitecan sagramostim saquinavir
Docetaxel satraplatin
Selegiline HCL sertraline hydrochloride sevelamer hydrochloride sevirumab sibutramine hydrochloride sildenafil citrate simvastatin sinapultide sitafloxacin sodium polystyrene sulfonate
Sotalol HCL sparfosic acid
Spironolactone stavudine sucralfate sumatriptan tabimorelin tamoxifen citrate tamsulosin hydrochloride
Temazepam tenofovir disoproxil tepoxalin
Terazosin HCL terbinafine hydrochloride terbutaline sulfate teriparatide tetracycline
thalidomide
Theophylline
Thiotepa thrombopoetin, TPO tiagabine hydrochloride ticlopidine hydrochloride tifacogin tirapazamine tirofiban hydrochloride tizanidine hydrochloride
Tobramycin sulfate tolterodine tartrate tomoxetine topiramate
Topotecan HCL toresemide tPA analogue
Tramadol HCL trandolapril trastuzumab
Trazadone HCL
Triamterene/HCTZ troglitazone trovafloxacin mesylate urokinase
Ursodiol valacyclovir hydrochloride valdecoxib
Valproic Acid valsartan, hydrochlorothiazide valspodar
Vancomycin HCL
Vecuronium bromide veniafaxine hydrochloride
Verapamil HCL vinorelbine tartrate
Vitamin B12
Vitamin C voriconazole
Warfarin Sodium xaliproden zafirlukast zaleplon zenarestat zidovudine zolmitriptan
Zolpidem bleomycin
Phytoseterol
paclitaxel
Flutiasone
Fluorouracil
Pseudoephedrine
A 78773
AGI 1067
BCX CW1812
BMS CW 188667
BMS CW 193884
BMS.CW204352
BPI 21
CD11a
CEB 925
Propofol
GT 102279
Recombinant hepatitis vaccine
L 159282
LFA3TIP
Daily Multi Vit
Erythromycn/Sulfsx
Ethinyl estradiol; Desogestrel
Lithium Carbonate
LYM 1
Methylprednisolone Sodium succinate rotavirus vaccine saquinavir mesylate arginine heparin
Thymosin alpha montelukast sodium and fexofenadine hydrochloride lodothyronine lodothyronine and thyroxine
Codeine
Ethylmorphine
Diacetylmorphine
Hydromorphone
Hydrocodone
Oxymorphone
Dihydrocodeine
Dihydromorphine
Methyldihydromorphinone
Codeine and promethazine
Codeine, phenylephrine and promethazine
Codeine and guaifenesin
Codeine, guaifenesin and pseudoephedrine
Aspirin, carisoprodol and codeine
Himatropine methylbromide and hydrocodone bitartrate
Hydrocodone bitartrate and phenylpropanolamine
Acetaminophen and hydrocodone bitartrate
Chlorpheniramine maleate, hydrocodone bitartrate and pseudoephedrine
Guaifenesin and hydrocodone
Ibuprofen and hydrocodone
Chlorpheniramine polistirex and hydrocodone polystirex naltrexone
Preferably, the polypeptide is (i) an oligopeptide, (ii) a homopolymer of one of the twenty naturally occurring amino acids (L or D isomers), or an isomer, analogue, or derivative thereof, (iii) a heteropolymer of two or more naturally occurring amino acids (L or D isomers), or an isomer, analogue, or derivative thereof, (iv) a homopolymer of a synthetic amino acid, (v) a heteropolymer of two or more synthetic amino acids or (vi) a heteropolymer of one or more naturally occurring amino acids and one or more synthetic amino acids.
Proteins, oligopeptides and polypeptides are polymers of amino acids that have primary, secondary and tertiary structures. The secondary structure of the protein is the local conformation of the polypeptide chain and consists of helices, pleated sheets and turns. The protein's amino acid sequence and the structural constraints on the conformations of the chain determine the spatial arrangement of the molecule. The folding of the secondary structure and the spatial arrangement of the side chains constitute the tertiary structure.
Proteins fold because of the dynamics associated between neighboring atoms on the protein and solvent molecules. The thermodynamics of protein folding and
unfolding are defined by the free energy of a particular condition of the protein that relies on a particular model. The process of protein folding involves, amongst other things, amino acid residues packing into a hydrophobic core. The amino acid side chains inside the protein core occupy the same volume as they do in amino acid crystals. The folded protein interior is therefore more like a crystalline solid than an oil drop and so the best model for determining forces contributing to protein stability is the solid reference state.
The major forces contributing to the thermodynamics of protein folding are Van der Waals interactions, hydrogen bonds, electrostatic interactions, configurational entropy and the hydrophobic effect. Considering protein stability, the hydrophobic effect refers to the energetic consequences of removing apolar groups from the protein interior and exposing them to water. Comparing the energy of amino acid hydrolysis with protein unfolding in the solid reference state, the hydrophobic effect is the dominant force. Hydrogen bonds are established during the protein fold process and intramolecular bonds are formed at the expense of hydrogen bonds with water. Water molecules are "pushed out" of the packed, hydrophobic protein core. All of these forces combine and contribute to the overall stability of the folded protein where the degree to which ideal packing occurs determines the degree of relative stability of the protein. The result of maximum packing is to produce a center of residues or hydrophobic core that has maximum shielding from solvent.
Since it is likely that lipophilic drugs would reside in the hydrophobic core of a peptide, it would require energy to unfold the peptide before the drug can be released. The unfolding process requires overcoming the hydrophobic effect by hydrating the amino acids or achieving the melting temperature of the protein. The
heat of hydration is a destabilization of a protein. Typically, the folded state of a protein is favored by only 5-15 kcal/mole over the unfolded state. Nonetheless, protein unfolding at neutral pH and at room temperature requires chemical reagents. In fact, partial unfolding of a protein is often observed prior to the onset of irreversible chemical or conformation processes. Moreover, protein conformation generally controls the rate and extent of deleterious chemical reactions.
Conformational protection of active agents by proteins depends on the stability of the protein's folded state and the thermodynamics associated with the agent's decomposition. Conditions necessary for the agent's decomposition should be different than for protein unfolding.
Selection of the amino acids will depend on the physical properties desired. For instance, if increase in bulk or lipophilicity is desired, then the carrier polypeptide will be enriched in the amino acids in the table provided below. Polar amino acids, on the other hand, can be selected to increase the hydrophilicity of the polypeptide.
Ionizing amino acids can be selected for pH controlled peptide unfolding.
Aspartic acid, glutamic acid and tyrosine carry a neutral charge in the stomach, but will ionize upon entry into the intestine. Conversely, basic amino acids, such as histidine, lysine and arginine, ionize in the stomach and are neutral in an alkaline environment.
Other factors such as π-π interactions between aromatic residues, kinking of
the peptide chain by addition of proline, disulfide crosslinking and hydrogen bonding can all be used to select the optimum amino acid sequence for a given application. Ordering of the linear sequence can influence how these interactions can be
maximized and is important in directing the secondary and tertiary structures of the polypeptide.
Furthermore, amino acids with reactive side chains (e.g., glutamic acid, lysine, aspartic acid, serine, threonine and cysteine) can be incorporated for attaching multiple active agents or adjuvants to the same carrier peptide. This is particularly useful if a synergistic effect between two or more active agents is desired.
As stated above, variable molecular weights of the carrier compound can have profound effects on the active agent release kinetics. As a result, low molecular weight active agent delivery systems are preferred. An advantage of this invention is that chain length and molecular weight of the polypeptide can be optimized depending on the level of conformational protection desired. This property can be optimized in concert with the kinetics of the first order release mechanism. Thus, another advantage of this invention is that prolonged release time can be imparted by increasing the molecular weight of the carrier polypeptide. Another, significant advantage of the invention is that the kinetics of active agent release is primarily controlled by the enzymatic hydrolysis of the key bond between the carrier peptide and the active agent.
Dextran is the only polysaccharide known that has been explored as a macromolecular carrier for the covalent binding of drug for colon specific drug delivery. Generally, it was only possible to load up to 1/10 of the total drug-dextran conjugate weight with drug. As stated earlier, polysaccharides are digested mainly in the colon and drug absorption is mainly limited to the colon. As compared to dextran, this invention has two major advantages. First, peptides are hydrolyzed by any one of several aminopeptidases found in the intestinal lumen or associated with the brush-
border membrane and so active agent release and subsequent absorption can occur in the jejunum or the ileum. Second, the molecular weight of the carrier molecule can be controlled and, thus, active agent loading can also be controlled.
As a practical example, the following table lists the molecular weights of lipophilic amino acids (less one water molecule) and selected analgesics and vitamins.
TABLE 2
Amino acid MW Active agent MW
Glycine . 57 Acetaminophen 151
Alanine 71 Vitamin B6 (Pyroxidine) 169
Valine 99 Vitamin C (Ascorbic acid) 176
Leucine 113 Aspirin 180
Isoleucine 113 Ibuprofen 206
Phenylalanine 147 Retinoic acid 300
Tyrosine 163 Vitamin B2 (Riboflavin) 376
Vitamin D2 397
Vitamin E (Tocopherol) 431
Lipophilic amino acids are preferred because conformational protection through the stomach is important for the selected active agents, which were selected based on ease of covalent attachment to an oligopeptide. Eighteen was subtracted from the amino acid's molecular weight so that their condensation into a polypeptide is considered. For example, a decamer of glycine (MW=588) linked to aspirin would have a total molecular weight of 750 and aspirin would represent 24% of the total weight of the active agent delivery composition or over two times the maximum drug loading for
dextran. This is only for an N- or C- terminus application, for those active agents attached to pendant groups of decaglutamic acid, for instance, a drug with a molecular weight of 180 could conceivably have a loading of 58%, although this may not be entirely practical.
The alcohol, amine or carboxylic acid group of the active agent is covalently attached to the N-terminus, the C-terminus or the side chain of the oligopeptide or polypeptide. The location of attachment depends somewhat on the functional group selection. For instance, if the active drug is a carboxylic acid (e.g., aspirin) then the N-terminus of the oligopeptide is the preferred point of attachment as shown in Fig. 1. If the active agent is an amine (e.g., ampicillin), then the C-terminus is the preferred point of attachment in order to achieve a stable peptide linked active agent as shown in Fig. 2. In both, the C- and N-terminus examples, the peptide is, in essence, extended by one monomeric unit forming a new peptide bond. If the active agent is an alcohol, then either the C-terminus or the N-terminus is the preferred point of attachment in order to achieve a stable composition. As in the example above where the alcohol, norethindrone, was covalently attached to poly(hydroxypropylglutamine), an alcohol can be converted into an alkylchloroformate with phosgene. This invention, then, pertains to the reaction of this key intermediate with the N-terminus of the peptide carrier as shown in Fig. 3. Figs. 1 through 3 also depict the release of the active ingredient from the peptide carrier by intestinal peptidases.
The alcohol can be selectively bound to the gamma carboxylate of glutamic acid and then this conjugate covalently attached to the C-terminus of the peptide carrier. Because the glutamic acid-drug conjugate can be considered a dimer, this product adds two monomeric units to the C-terminus of the peptide carrier where the
glutamic acid moiety serves as a spacer between the peptide and the drug as shown in Fig. 4. Intestinal enzymatic hydrolysis of the key peptide bond releases the glutamic acid-drug moiety from the peptide carrier. The newly formed free amine of the glutamic acid residue will then undergo an intramolecular transamination reaction, thereby, releasing the active agent with coincident formation of pyroglutamic acid as shown in Fig. 5. Alternatively, the glutamic acid-drug dimer can be converted into the gamma ester of glutamic acid N-carboxyanhydride. This intermediate can then be polymerized, as described above, using any suitable initiator as shown in Fig. 4. The product of this polymerization is polyglutamic acid with active ingredients attached to multiple pendant groups. Hence, maximum drug loading of the carrier peptide can be achieved. In addition, other amino acid-NCA's can be copolymerized with the gamma ester glutamic acid NCA to impart specific properties to the drug delivery system.
The invention also provides a method of imparting the same mechanism of action for other polypeptides containing functional side chains. Examples include, but are not limited to, polylysine, polyasparagine, polyarginine, polyserine, polycysteine, polytyrosine, polythreonine and polyglutamine. The mechanism can translate to these polypeptides through a spacer or linker on the pendant group, which is terminated, preferably, by the glutamic acid-drug dimer. This carrier peptide-drug conjugate is distinguished from the prior art by virtue of the fact that the primary release of the drug moiety relies on peptidases and not on esterases. Alternatively, the active agent can be attached directly to the pendant group where some other indigenous enzymes in the alimentary tract can affect release.
The active agent can be covalently attached to the N-terminus, the C-terminus or the side chain of the polypeptide using known techniques. Examples of linking organic compounds to the N-terminus type of a peptide include, but are not limited to, the attachment of naphthylacetic acid to LH-RH, coumarinic acid to opioid peptides and l,3-dialkyl-3-acyltriazenes to tetragastrin and pentagastrin. As another example, there are known techniques for forming peptide linked biotin and peptide linked acridine.
The polypeptide carrier can be prepared using conventional techniques. A preferred technique is copolymerization of mixtures of amino acid N- carboxyanhydrides. Alternatively, if a specific sequence is desired, a solid state automated peptide synthesizer can be used.
The addition of stabilizers to the composition has the potential of stabilizing the polypeptide further. Stabilizers such as sugar, amino acids, polyethylene glycol (PEG) and salts have been shown to prevent protein unfolding. In another embodiment of the invention, a pre-first order release of the active agent is imparted by microencapsulating the carrier polypeptide-active agent conjugate in a polysaccharide, amino acid complex, PEG or salts.
There is evidence that hydrophilic compounds are absorbed through the intestinal epithelia efficiently via specialized transporters. The entire membrane transport system is intrinsically asymmetric and responds asymmetrically to cofactors. Thus, one can expect that excitation of the membrane transport system will involve some sort of specialized adjuvant resulting in localized delivery of active agents. There are seven known intestinal transport systems classified according to the physical properties of the transported substrate. They include the amino acid,
oligopeptide, glucose, monocarboxic acid, phosphate, bile acid and the P-glycoprotein transport systems and each has its own associated mechanism of transport. The mechanisms can depend on hydrogen ions, sodium ions, binding sites or other cofactors. The invention also allows targeting the mechanisms for intestinal epithelial transport systems to facilitate absorption of active agents.
In another embodiment of the invention, the composition includes one or more adjuvants to enhance the bioavailability of the active agent. Addition of an adjuvant is particularly preferred when using an otherwise poorly absorbed active agent. Suitable adjuvants, for example, include: papain, which is a potent enzyme for releasing the catalytic domain of aminopeptidase-N into the lumen; glycorecognizers, which activate enzymes in the BBM; and bile acids, which have been attached to peptides to enhance absorption of the peptides.
Preferably, the resultant peptide-active agent conjugate is formulated into a tablet using suitable excipients and can either be wet granulated or dry compressed.
Compositions of the invention are, in essence, the formation of amides from acids and amines and can be prepared by the following examples.
Acid/N-terminus conjugation (Fig. 1)
An acid bioactive agent can be dissolved in DMF under nitrogen and cooled to 0 C. The solution can then be treated with diisopropylcarbodiimide and hydroxybenzotriazole followed by the amine peptide carrier. The reaction can then be stirred for several hours at room temperature, the urea by-product filtered off, the product precipitated out in ether and purified using gel permeation chromatography (GPC) or dialysis.
Amine/C-terminus conjugation (Fig. 2)
The peptide carrier can be dissolved in DMF under nitrogen and cooled to 0 °C. The solution can then be treated with diisopropylcarbodiimide and hydroxybenzotriazole followed by the amine bioactive agent. The reaction can then be stirred for several hours at room temperature, the urea by-product filtered off, the product precipitated out in ether and purified using GPC or dialysis.
AIcohoI N-Terminus Conjugation (Fig. 3)
In the following example the combination of the alcohol with triphosgene produces a chloroformate, which when reacted with the N-terminus of the peptide produces a carbamate. Pursuant to this, an alcohol bioactive agent can be treated with triphosgene in dry DMF under nitrogen. The suitably protected peptide carrier is then added slowly and the solution stirred at room temperature for several hours. The product is then precipitated out in ether The crude product is suitably deprotected and purified using GPC.
Other solvents, activating agents, cocatalysts and bases can be used. Examples of other solvents include dimethylsulfoxide, ethers such as tetrahydrofuran
or chlorinated solvents such as chloroform. Examples of other activating agents include dicyclohexylcarbodiimide or thionyl chloride. An example of another cocatalyst is N-hydroxysuccinimide. Examples of bases include pyrrolidinopyridine, dimethylaminopyridine, triethylamine or tributylamine.
Preparation of γ-AIkyl Glutamate (Fig. 4)
There have been over 30 different γ-alkyl glutamates prepared any one of
which may be suitable for the drug alcohol of choice. For example, a suspension of glutamic acid, the alcohol and concentrated hydrochloric acid can be prepared and
heated for several hours. The γ-alkyl glutamate product can be precipitated out in
acetone, filtered, dried and recrystallized from hot water.
γ-Alkyl Glutamate/C-Terminus Conjugation (Fig. 4)
The peptide carrier can be dissolved in DMF under nitrogen and cooled to 0
°C. The solution can then be treated with diisopropylcarbodiimide and
hydroxybenzotriazole followed by the γ-alkyl glutamate bioactive agent. The reaction
can then be stirred for several hours at room temperature, the urea by-product filtered off, the product precipitated out in ether and purified using GPC or dialysis.
Preparation of γ-Alkyl Glutamate-NCA
γ-Alkyl glutamate can be suspended in dry THF where triphosgene is added
and the mixture refluxed under a nitrogen atmosphere until the mixture becomes homogenous. The solution can be poured into heptane to precipitate the NCA product, which is filtered, dried and recrystallized from a suitable solvent.
Preparation of Poly[γ-AIkyl Glutamate]
γ-Alkyl glutamate-NCA can be dissolved in dry DMF where a catalytic
amount of a primary amine can be added to the solution until it becomes viscous (typically overnight). The product can be isolated from the solution by pouring it into water and filtering. The product can be purified using GPC or dialysis.
EXAMPLE 1
Preparation of Capped lodothyronine Composition Comprising a Copolymer of T3 and T4 Covalently Attached to the N-terminus of Polyglutamic Acid
The synthesis of polyglutamic acid is well known through a variety of reported methods. For the present examples polyglutamic acid was synthesized through the activation of the Benzyl Glutamic NCA (BnGlu-NCA) monomer. The BnGlu-NCA was then polymerized and the benzyl groups removed with hydrogen bromide. When capping polyglutamic acid, the liberation of its N-terminus amino group from the hydrogen bromide complex without imparting unwanted nucleophilicity to the free carboxylic acids is critical. Reactions using sodium carbonate, sodium bicarbonate, and sodium acetate produced glutamic acid/ j/Ts copolymer with the T and T3 incorporation decreasing with increasing pKb. Sodium acetate was the preferred reagent because its pKb is between that of sodium bromide, polyglutamic acid, and sodium salt. The reaction using basic alumina kept the T -NCA and T3-NCA intact with no apparent capping or self-polymerization. The stability of T -NCA and T3- NCA will influence how glutamic acid/iyTs copolymer will be commercially manufactured. Sodium acetate can be replaced with sodium carbonate, sodium bicarbonate, sodium propionate, sodium butyrate, sodium pivalate, basic alumina, or
any other weak base capable of neutralizing hydrogen bromide complexed with an amino group.
The synthesis of glutamic acid/iVTs copolymer began with benzylglutamic acid, thyroxine, and triiodothyronine. Each of these synthons was independently reacted with triphosgene in a suitable organic solvent. The BnGlu-NCA was polymerized in tetrahydrofuran (THF) with sodium methoxide as an initiator.
Polybenzylglutamic acid was deprotected with 15% hydrogen bromide in acetic acid.
This product needs to be free of uncomplexed hydrogen bromide where it was dissolved in DMF and treated with sodium acetate. The previously prepared T -NCA and T3-NCA were blended and added to the solution. The reaction was then stirred until T -NCA or T3-NCA were no longer detected by thin layer chromatography
(TLC). The final product was added to water and the precipitate was washed with water and dried in vacuo to yield a white amorphous powder.
Experimentation with several weak bases revealed that a variety of sodium salts of a carboxylic acid work in capping polyglutamic acid. The reaction was tried with sodium propionate, sodium butyrate, and sodium pivalate in lieu of sodium acetate all with essentially the same result.
Preparation of benzylglutamic acid-NCA
Benzylglutamic acid (25 grams) was suspended in 400 mL anhydrous ethyl acetate under nitrogen. The mixture was heated to reflux where 30 grams of triphosgene was added in six (6) equal portions. The reaction was refluxed for three (3) hours until homogenous. The solution was cooled to room temperature, filtered, and concentrated in vacuo. The white powder was recrystallized from 50 mL of hot anhydrous ethyl acetate to yield 17.4 grams (63%) of a white powder. Preparation of T4-NCA
In a round bottom flask fitted with a nitrogen inlet, five grams of thyroxine was stirred with 25 mL of tetrahydrofuran (THF) and 1.3 grams of triphosgene and the mixture refluxed for four (4) hours until homogenous. The solution was cooled to room temperature, and added dropwise to 200 mL of heptane with stirring. The crystals were filtered and dried in vacuo to yield 4.72 grams (91%) of an off-white powder. Preparation of T3-NCA
In a round bottom flask fitted with a nitrogen inlet, 4.29 grams of triiodothyronine was stirred with 20 mL of tetrahydrofuran (THF) and 1.45 grams of triphosgene and the mixture refluxed for four (4) hours until homogenous. The solution was cooled to room temperature and added dropwise to 200 ml of heptane with stirring. The liquid was decanted off the yellow gum, which was recrystallized, from anhydrous ethyl acetate and hexanes to yield 2.5 grams (56%) of a white powder that was dried under high vacuum. Preparation of polybenzylglutamic acid
Benzylglutamic acid (17.4 grams) was dissolved in anhydrous tetrahydrofuran
(THF) under nitrogen where 238 mg of sodium methoxide was added portionwise. The solution was stirred for two (2) days with a marked increase in viscosity. The solution was poured into 1.5 L of petroleum ether with stirring. The petroleum ether was decanted off and an additional 1L of petroleum ether was added back. The mixture was stirred by hand, the petroleum ether was decanted off and the process repeated with 500 mL of petroleum ether. The white solid was air dried and then vacuum dried to yield 14.7 (95%) of a white fluffy paper-like solid.
Preparation of polyglutamic acid
Acetic acid (lOmL) was stirred with 0 mL 30wt% hydrogen bromide (HBr) in acetic acid where 1.96 of polybenzylglutamic acid was added by hand. The mixture was stirred at room temperature for one day and was, then, added to 50 mL of ether. The white precipitant was filtered, washed with 4 x 30 mL of ether and dried under a high vacuum to yield 1.11 grams (97%) of a white powder. Preparation of glutamic acidT Tj copolymer
Polyglutamic acid (375 mg) was dissolved in dry 3 mL DMF. Sodium acetate (24 mg) was added followed by a blend of 105 mg of T4-NCA and 8 mg of T3-NCA. The solution was stirred for two (2) days where TLC showed the absence of thyronine
starting materials. The solution was poured into 30 mL of water and cooled 10 °C overnight. The precipitant was filtered, washed with water, and dried under high vacuum to yield 413 mg (85%) of light beige powder. The proton NMR revealed a copolymer of T3 and T4 covalently attached to the N-terminus of polyglutamic acid, which was virtually completely digested by the pronase enzyme system in two hours.
EXAMPLE 2
Preparation of Peptide Polymers
Polyaspartic acid: Asp(OtBu) (13mg, 0.07mmol) and Asp(OfBu)-NCA (200mg, 0.93 mmol) were dissolved in anhydrous DMF (5ml), and the solution allowed to stir over night at room temperature under argon. The following morning, 2.5 ml of the reaction mixture was transferred to separate flask (Flask B). T4-NCA (27mg, 0.03mmol) was added to the original flask (Flask A), and both solutions were allowed to continue stirring under argon for an additional 24 hours. Polymer was
then precipitated by the addition of water (50ml) to each flask. The resulting solids were collected by filtration and dried over night under vacuum.
The dried Asp(OtBu)n (Flask B) and T4-Asp(OfBu)n (Flask A) were then dissolved in 95% trifluoroacetic acid in water (3ml) and allowed to stir at room temperature for 2 hours. The deprotected polymers were then precipitated by the addition of ethyl ether (10ml) and then storing the suspension at 4 °C for 2 hours. The respective polymers were then collected by filtration and the solids dried over night under vacuum. This afforded 48mg of Aspn (Flask B) and 12mg of T4-Aspn (Flask A). MALDI indicated that T4-Aspn (Flask A) consisted of a mixture of polymers of varying lengths: T4-Asp3.12.
Polyserine and Polythreonine were also prepared using this protocol. The serine reaction mixture contained N-methylmorpholine (1.1 equivalents).
Amino acid derivative Polymer Isolated Percent yield Mass Range
Asp(OtBu) Asp(OfBu)n 48mg 84% NA
T4-Asp(OfBu)n 12mg 14% T4-Asp3.12
Ser(OtBu) Ser(OtBu)n 73mg 101 %3 Ser7.8
T4-Ser(OtBu)n 50mg 43% T4-Ser4_9
Thr(OfBu) Thr(OtBu)n 29mg 20% Thr7.8
T4-Thr(OtBu)n 66mg 24% T4-Thr1.8
The percent yield was estimated based on the total amino acid content in the original
reaction prior to splitting the reaction. The Mass range was determined from MALDI.
The yield over 100% could reflect either the presence of salts or uneven distribution when the reaction mixture was split.
, HPLC and Pronase experiments indicate little to no free T4 is present in the T4-
Asp3.12, T4-Ser .9 and T4-Thr1_8 samples, and that T4 is liberated upon digestion.
N-carboxyanhydrides
N-carboxyanhydrides (NCA's) of the amino acids listed below were prepared using a protocol similar to that reported for glutamic acid. Minor variations in their final workups are noted below.
Amino Acid Chemical Shift in the NCA α β γ other (OtBu)
Alanine 4.41 (q, 1H) 1.57 (d, 3H)
Valine 4.20 (d, 1H) 2.28-2.19 (m, lH) 1.08 (d, 3H) 1.02 (d, 3H)
Serine (OtBu) 4.58 (m, 1H) 3.62 (dd, 1H) 1.10 (s, 9H) 3.50 (dd, 1H)
Aspartic acid (OtBu) 4.51 (dd, 1H) 2.93 (dd, 1H) 1.44 (s, 9H) 2.73 (dd, 1H)
Glutamic acid (OtBu) 4.34 (dd, 1H) 2.28-2.20 (m, 1H) 2.45 (t, 2H) 1.44 (s, 9H)
2.09-1.99(m, 1H)
Amino Acid Isolation of NCA
Alanine precipitate with hexanes in 68% yield
Valine precipitate with hexanes in 89% yield
Serine (OtBu) suspended in isopropanol and precipitated with hexanes in 83% yield
Aspartic acod (OtBu) suspended in isopropanol and precipitated with hexanes in 55% yield
Glutamic acid (OtBu) suspended in isopropanol and precipitated with hexanes in 77% yield
EXAMPLE 3
Preparation of (Glu)n-Cephalexin
Glu(OtBu)NCA (1.000 g, 4.4mmol) and Cephalexin»HCl (0.106g, 0.3mmol) were dissolved in anhydrous DMF (5ml). The reaction was then allowed to stir at room temperature under argon. After 3 days, the solvent was removed by rotary- evaporation under vacuum. The resulting solid was then placed under argon and then dissolved in 4N HCl in Dioxane (2ml) and then allowed to stir at room temperature under a blanket of argon. After 1 hour, the dioxane and HCl were removed by rotary- evaporation under vacuum. The solid was then suspended in methanol (2ml) and once more brought to dryness by rotary-evaporation in order to remove residual HCl and dioxane. This material was then resuspended in methanol (2ml) and precipitated by the addition of water (20ml). The aqueous suspension was then stored at 4°C for 4
hours, and the solid isolated by centrifugation. The pelleted material was then allowed to dry under vacuum over night. This process afforded a mixture of (Glu)n and (Glu)n-cephalexin (464mg) as determined by MALDI. MALDI indicates a mixture of polymers (Glu)7_13 and (Glu)5_14-cephalexin. Other chain-lengths may be present but they are not clearly visible in the MALDI spectra. Reversed-phase HPLC (265nm detection, C18 column, 16%MeOH/4%THF/80%water mobile phase) indicated that no free cephalexin was present in the isolated material. "Water" in the HPLC actually refers to an aqueous buffer of 0.1% heptanesulfonic acid and 1.5% triethylamine.
EXAMPLE 4
Naltrexone Derivatives:
3-Methyl-naltrexone: Naltrexone (6.0 g, 16.5 mmol) was dissolved in 100 ml distilled water. The solution was titrated with IN NaOH to a final pH of 11.8. In the course of the titration, neutral naltrexone precipitated from solution and then went back into solution. Upon reaching pH 11.8, the solvent was removed by rotary- evaporation under high vacuum, and the resulting solid stored under vacuum over night at room temperature.. The solid was then suspended/dissolved in anhydrous tetrahydrofuran (200 ml) and allowed to stir at room temperature under argon. A solution of iodomethane (2.1 mg, 33 mmol) in 50 ml of tetrahydrofuran was added
dropwise over the course 30 minutes. The reaction was then allowed to stir an additional 3 hours at room temperature under argon. The solvent was then removed by rotary-evaporation under reduced pressure. The residual solid was then dissolved in 40 ml of CHC13 and the organic solution washed with 30 ml of saturated NaCl , 3x30 ml of IN NaOH and finally twice more with 30 ml saturated aqueous NaCl. The organic solution was collected and dried over sodium sulfate. Removal of solvent by rotary-evaporation and drying over night under vacuum afforded pure 3- methylnaltrexone (5.6g, 15.8 mmol, 96% yield) as a brown residue and composition determined by TLC and 1H-NMR. Features used to identify the compound by
comparison to the spectrum of naltrexone: 1H-NMR (360 MHz, CDC13) δ 6.677 (d, 1H, naltrexone aromatic), 6.591 (d, 1H, naltrexone aromatic), 3.874 (s, 3H, methoxy group.), 0.6-0.5 ppm (m, 2H, naltrexone cyclopropyl) and 0.2-0.1 ppm (m, 2H, naltrexone cyclopropyl).
Boc-Glu(Nal)-OtBu: The solids Boc-Glu-OtBu (0.96g, 3.18mmol), naltrexone (l.OOg, 2.65mmol) and PyBrop (1.73g, 3.71mmol) were dissolved in 5 ml of anhydrous DMF and stirred at room temperature under argon. Dry N- methylmorpholine (1.08ml, 9.81mmol) was added and the reaction allowed to continue stirring at room temperature under argon. After two days additional Boc- Glu-OtBu (0.096g, 0.32mmol), PyBrop (0.173g, 0.37mmol) and N-methylmorpholine (0.10ml, 0.981mmol) were added. After 2 more days, the solvent was removed by rotary-evaporation under high vacuum. The resulting residue was then dissolved in CHC13, and the resulting organic solution extracted with 2x20 ml of saturated NaCl , 3x20 ml of 10% Na2CO3 and a final wash with 20 ml saturated aqueous NaCl. The organic solution was collected, dried over sodium sulfate and then adsorbed onto silica. Pure naltrexone conjugated amino acid (0.486g, 0.78mmol, 29%) was then
isolated by flash chromatography and a gradient of 0-1.5% CH3OH in CHC13. The purity of the isolated material was determined by TLC (6:1 CH3OH/CHCl3), and the presence of both the amino acid moiety and the naltrexone were confirmed by !H-
NMR. Indicative protons: 1H-NMR (360 MHz, CDC13) δ 6.81 (d, IH, naltrexone
aromatic), 6.63 (d, IH, naltrexone aromatic), 4.3-4.2 (m, IH, glutamic acid α-proton),
1.7-1.3 (pair of bs, 18H, Boc and OtBu groups.), 0.6-0.4 ppm (m, 2H, naltrexone cyclopropyl) and 0.2-0.0 ppm (m, 2H, naltrexone cyclopropyl).
Boc-Asp(Nal)-OtBu: Boc-Asp(Nal)-OtBu was obtained in 41% isolate yield using a
similar protocol. Indicative protons: 1H-NMR (360 MHz, CDC13): δ 6.84 (d, IH,
naltrexone aromatic), 6.66 (d, IH, naltrexone aromatic), 4.6-4.5 (m, IH, aspartic acid
α-proton), 1.6-1.3 (pair of bs, 18H, Boc and OtBu groups.), 0.7-0.5 ppm (m, 2H,
naltrexone cyclopropyl) and 0.4-0.1 ppm (m, 2H, naltrexone cyclopropyl).
NMR characterization:
While naltrexone has a complex NMR spectrum, there are several key protons that have distinct chemical shifts and are unique to naltrexone.
Pair of mult plets each corresponding rotons
EXAMPLE 5
2-Amino-9-(2-hydroxy-ethoxymethyl)-1,9-dihydro-purin-6-one
1. 1-(3-dimethylamϊnopropyl)
-3-ethylcarbodiimide, DMF,
3° amine base
2. Acyclovir, DMF, 3 amine base
PoIy-GIu(Acyclovir)
To a solution of poly-glu15 (0.600g, 0.310mmol) in DMF (25ml) was added
EDCI (2.07g, 10.8mmol). The resulting mixture was allowed to stir at ambient temperature for one hour. Then, N-methyl morpholine (0.51ml, 4.7mmol) was added followed by a mixture of acyclovir (1.74g, 7.75mmol), DMF (25ml) and N-methyl morpholine (0.85ml). The reaction mixture was stirred at ambient temperature for 4 days. After this, water (50ml) was added and all solvent was removed. To the dried mixture was added water (100ml) and a precipitate of unreacted acyclovir formed. Solid was centrifuged and the supernate was purified using ultrafiltration (YMl
membrane). Approximately 300ml water was allowed to pass through the membrane. NMR has shown an unexpected alkyl-urea side chain attached impurity. Poly-
glu(acyclovir) (0.970g) was obtained as a light yellow solid: 1H NMR (D2O) δ 1.11
(br m, 4H, urea), 2.01 (br m, 2H, Glu-β H), 2.39 (br m, 2H, Glu-γH), 2.72 (br m, 2H, urea), 3.32 (br m, 6H, acyclovir CH2 and urea), 3.83 (br m, 3H, urea), 4.38 (br d, 3H,
Glu-α H), 5.47 (br s, 2H, acyclovir 1' CH2), 7.94 (br s, IH, acyclovir 8 CH). EXAMPLE 6
Fexofenadine
2-(4-{1-Hydroxy-4-[4-( ydroxy-diphenyl-methyl)-piperidin-1-yl]-butyl}-phenyl)-2-methyl-propionic acid
1. 1-(3-dimethy)aminopropyl)
-3-ethylcarbodiimide, DMF,
N-methyl morpholine
2. Fexofenadine, DMF, N-methyl morpholine
Poly-Glu(Fexofenadine)
To a solution of poly-glu15 (0.078g, 0.040mmol) in DMF (5ml) was added EDCI (0.035g, O.lδmmol). After stirring for 30 minutes, N-methyl morpholine was added (0.03ml, 0.24mmol). After stirring for 10 minutes, a solution of fexofenadine (O.lOOg, 0.20mmol), N-methyl morpholine (0.07ml, 0.60mmol) and DMF (5ml) was added via a syringe. After stirring reaction at ambient temperatures for three days, sample was dissolved in water (25ml). A solid precipitate formed which was both drug-conjugate and free fexofenadine. Water was acidified and all solids dissolved. Purification using ultrafiltration (YMl followed by YM3) and size exclusion chromatography using Sephadex-25 at pH 7 yielded poly-glu(fexofenadine) (0.0 lOg)
as a white solid: 1H NMR (D2O) δ 1.37 (s, 8H, fex. CH2 and CH3), 1.58 (br m, 5H,
fex. CH and CH2), 1.99 (br m, 24H, Glu-β H), 2.31 (br m, 24H, Glu-γH), 2.70 (br m,
10H, fex. CH and CH2), 4.14 (br m, 26H, Glu-α H), 7.25 (br m, 14H, fex. aromatic
H).
EXAMPLE 7
Zalcitabine 4-Amino-1-(5-hydroxymethyl-tetrahydro-furan-2-yl)-1W-pyrimidin-2-one
1. l-(3-dimethylaminopropyl)
-3-ethylcarbodiimide, DMF,
N-methyl morpholine
2. Zalcitabine, DMF, N-methyl morpholine
Poly-Glu(Zalcitabine)
To a solution of poly-gluι5 (0.123g, O.OόOmmol) in DMF (8ml) was added EDCI (0.403g, 2.10mmol). After 30 minutes, N-methyl morpholine (0.13ml,
1.2mmol) was added. After 35 minutes, a solution of zalcitabine (0.200g, 0.95mmol),
N-methyl morpholine (0.10ml, 0.9mmol) and DMF (2ml) was added via a syringe.
The resulting mixture was stirred at ambient temperature for 48 hours. Solvent was removed and the residue was dissolved in water (15ml). Ultrafiltration (YMl followed with YM3) and size exclusion using Sephadex-25 at pH 7 yielded poly-
glu(zalcitabine) (0.083g) as a light yellow solid: 1H NMR (DMSO-d6 w/D2O) δ 1.14
(br m, 20H, urea), 1.90 (br m, 30H, Glu-β H, Glu-γ H and CH2 in zalcitabine), 2.66
(br m, 4H, urea), 3.24 (br m, 36H, urea, CH and CH2 in zalcitabine), 4.29 (br m, 8H,
Glu-α H), 5.87 (br s, IH, zalcitabine 1' CH), 7.18 (br s, 1.19H, zalcitabine NH2), 8.52
(br s, IH, zalcitabine 6 CH).
EXAMPLE 8
Stavudine 1-(5-Hydroxymethyl-2,5-dihydro-furan-2-yl)-5-methyl-1 H-pyrimidine-2,4-dione
1. 1-(3-dimethylaminopropyl)
-3-ethylcarbodiimide, DMF,
N-methyl morpholine
2. Stavudine, DMF, N-methyl morpholine
Poly-Glu(Stavudine) Preparation was similar to poly-glu(zalcitabine). Purification using ultrafiltration (YMl) yielded poly-glu(stavudine) (0.089g) as a white solid: 1H NMR
(D_O) δ 1.87 (s, 3H, stavudine 5 CH3), 2.06 (br m, 38H, Glu-β H and Glu-γ H), 2.49
(br m, 12H, Glu-γ H), 3.75 (br m, 12H, urea and stavudine 5' CH2), 3.96 (br m, 12H,
urea), 4.45 (br d, 13H, Glu-α H), 5.98 (d, IH, stavudine 1' CH), 6.48 (d, IH,
stavudine 3' CH), 6.96 (d, IH, stavudine 2' CH), 7.63 (s, IH, stavudine 6 CH).
EXAMPLE 9
Metronidazole 2-(2-Methyl-5-nitro-imidazol-1-yl)-ethanol
1. 1-(3-dimethylaminopropyl)
-3-ethylcarbodiimide, DMF,
N-methyl morpholine
2. Metronidazole, DMF, N-methyl morpholine
Poly-Glu(Metronidazole)
Preparation was similar to poly-glu(zalcitabine). Purification using ultrafiltration (YMl) yielded poly-glu(metronidazole) (0.326g) as a yellow solid: 1H
NMR (DMSO-d6) δ 1.18 (br d, 13H, urea), 1.93 (br s, 17H, Glu-β H and Glu-γ H),
2.71 (br s, 16H, urea), 4.01 (br m, 18H, Glu-α H and metronidazole CH2), 4.58 (br s,
2H, metronidazole CH2), 8.05 (br s, IH, metronidazole 2 CH).
EXAMPLE 10
Methyl Naltrexone
D-glucose, trifiic acid CuS04, dioxane
Methyl Naltrexone - Glucose Ketal Conjugate
To a solution of methyl naltrexone (0.200g, 0.56mmol) in dioxane (20ml) was
added D-α-glucose (2.02g, 11.2mmol), trifiic acid (0.05ml, 0.62mmol), and CuSO4
(l.OOg). The reaction mixture was stirred at ambient temperatures for 4 days. Reaction was then filtered, neutralized with NaHCO3 (sat.) and filtered again. Dioxane and water were removed and the residue was taken up in CHCI3 and extracted with water (3X100ml). The organic layer was dried over MgSO and solvents were removed under reduced pressure. Crude product was purified over silica gel (0-10% MeOH in CHC13) to obtain the ketal conjugate (O.OlOg) in a 1:1
mixture with free methyl naltrexone: 1H NMR (CDCI3) δ 0.14 (br s, 4H, naltrexone
cyclopropyl), 0.53 (br m, 4H, naltrexone cyclopropyl), 0.90 (m, 2H, naltrexone cyclopropyl), 1.48 (m, 6H, naltrexone), 2.19-2.78 (m, 12H, naltrexone), 3.03 (m, 2H,
naltrexone), 3.75 (q, 2H, glucose), 3.87 (m, 8H, naltrexone CH3 and. glucose), 3.97 (q, 2H, glucose), 4.14 (q, IH. glucose), 4.33 (t, IH, glucose), 4.66 (s, IH, naltrexone), 6.65 (m, 4H, naltrexone). EXAMPLE 11
Acetaminophen yV-(4-Hydroxy-phenyl)-acetamide
1. HCl, Dioxane
2. Triphosgene
Glu-Acetaminophen NCA 3-(2,5-Dioxo-oxazolidin-4-yl)-propionic acid
4-acetylamino-phenyl ester
2-Amino-pentanedio'ιc acid 5-(4-acetylamlno-phenyl) ester or
Glu(Acetaminophen)
To a solution of Boc-Glu(OSuc)-OtBu (0.500g, 1.25mmol) and acetaminophen (0.944g, 6.25mmol) in THF (15ml) was added N-methyl morpholine
(1.40ml, 12.5mmol). The reaction was allowed to heat to reflux and stirred at reflux overnight. Solvent was then removed and the crude compound was purified over silica gel (50-75% ethyl acetate in hexanes) to obtain Boc-Glu(Acetaminophen)-OfBu
(0.432g, 0.900mmol, 72%): 1H NMR (CDC13) δ 1.43 (d, 18H, t-Bu), 1.97 (m, IH,
Glu-β H), 2.12 (s, 3H, acetaminophen CH3), 2.25 (m, IH, Glu-β H), 2.60 (m, 2H,
Glu-γH), 4.25 (m, IH, Glu-α H), 7.04 (d, 2H, acetaminophen aromatic), 7.48 (d, 2H,
acetaminophen aromatic). A solution of Boc-Glu(Acetaminophen)-OtBu (0.097g, 0.20mmol) in 4N HCl in dioxane (10ml) was stirred at ambient temperatures for 2 hours. Solvent was
removed to obtain glu(acetaminophen) (0.90g) as the HCl salt: 1H NMR (D2O) δ 2.19
(s, 3H, acetaminophen CH3), 2.41 (m, 2H, Glu-β H), 2.97 (t, 2H, Glu-γ H), 4.18 (t,
IH, Glu-α H), 7.19 (d, 2H, acetaminophen aromatic), 7.51 (d, 2H, acetaminophen
aromatic); 13C NMR (DMSO) δ 23.80, 29.25, 51.00, 66.24, 119.68, 121.69, 137.00,
145.35, 168.23, 170.42, 170.79.
3-(2,5-Dioxo-oxazolidin-4-yl)-propionic acid 4-acetylamino-
phenyl ester or Glu(Acetaminophen) NCA
To a mixture of 2-amino-pentanedioic acid 5-(4-acetylamino-phenyl) ester
(1.54g, 4.29mmol) in THF (40ml) was added triphosgene (1.02g, 3.43mmol). The resulting solution was stirred at reflux for 3 hours. During reaction, the product precipitated and was filtered away to obtain the NCA of glu(acetaminophen) (1.02g,
2.64mmol, 62%) as an off white solid: 1H NMR (DMSO-d6) δ 2.01 (s, 3H,
acetaminophen CH3), 2.15 (m, 2H, Glu-β H), 2.81 (m, 2H, Glu-γH), 3.76 (t, IH, Glu-
α H), 7.06 (d, 2H, acetaminophen aromatic), 7.63 (d, 2H, acetaminophen aromatic),
8.57 (br s, IH, amide), 10.19 (s, IH, amide); 13C NMR (DMSO) δ 23.81, 29.25,
52.13, 54.62, 119.66, 121.71, 136.98, 145.35, 167.44, 168.19, 170.46, 170.77.
EXAMPLE 12
Dipyrimadole
2-[{6-[Bis-(2-hydroxy-ethyl)-amino]-4,8-di-piperidin-1-yl-pyrimido[5,4-c/]pyrimidin-2-yl}-(2-hydroxy
-ethyl)-amino]-ethanol
: Boc-Glu-OtBu or H
4N HCl in dioxane
R = Glu or H
Glu(Dipyrimadole)
To a solution of dipyrimadole (0.500g, 0.990mmol) and Boc-Glu(OSuc)-OfBu (3.96g, 9.91mmol) in THF (35ml) was added DMAP (0.072g, 0.60mmol) and N- methyl morpholine (0.22ml, 1.98mmol). The solution was then refluxed for 48 hours.
Solvent was then removed and crude product was purified over silica gel (25-50% ethyl acetate in hexanes). Two major products were isolated, one with R=2-3 (0.57g)
and another with R=3-4 (2.80g), as bright yellow oils: [for R=2-3 1H NMR (CDC13) δ
1.41 (s, 42H, t-Bu), 1.64 (br s, 5H, dipyrimadole), 1.85 (m, 2H, Glu-β H), 2.07 (m,
2H, Glu-β H), 2.37 (m, 4H, Glu-γ H), 3.60-4.24 (m, 12H, Glu-α H and
dipyrimadole)]; [for R=3-4 similar as above except 1.44 (s, 56H, t-Bu)]. A solution of Boc-Glu(dipyrimadole)-OfBu (R=2-3, 0.57g) and 4N HCl in dioxane (20ml) was stirred at ambient temperature for 2.5 hours. Solvent was
removed and the product (0.280g) was a bright yellow solid: 1H NMR (DMSO-d6) δ
1.65 (br m, 4H, Glu-β H and dipyrimadole), 2.04 (br m, 2H, Glu-β H), 2.40 (br m,
4H, Glu-γH), 3.75 (br m, 8H, dipyrimadole), 3.91 (br m, 2H, Glu-α H), 8.55 (br m,
2H, amide H).
EXAMPLE 13
Zidovudine (AZT) 1-(4-Azido-5ihydroxymethyl-tetrahydro-furan-2-yl)-5-methyl-1 W-pyrimidine-2,4-dione
R = Glu
Glu(AZT)
To a solution of zidovudine (l.OOg, 3.75mmol) and Boc-Glu(OSuc)-OtBu (3.00g, 7.49mmol) in dioxane (75ml) was added DMAP (0.137g, 1.13mmol) and N- methyl morpholine (0.82ml, 7.49mmol). The solution was heated to reflux for 6
hours and heated at 70°C for 12 hours. Solvent was then removed and the crude product was purified over silica gel (100%CHC13) to obtain Boc-Glu(AZT)-OtBu
(1.09g, 1.91mmol, 51%) as a yellow foam: 1H NMR (CDC13) δ 1.40 (d, 32H, t-Bu),
1.86 (s, 3H, AZT CH3), 2.11 (m, 2H, Glu-β H), 2.38 (m, 4H, Glu-γ H and AZT 2'
CH2), 4.00-4.31 (m, 4H, AZT 4' CH, 5' CH2 and Glu-α H), 5.21 (d, IH, AZT 3' CH),
6.01 (t, IH, AZT 1' CH), 7.16 (s, IH, AZT 6 CH).
A solution of Boc-Glu(AZT)-OtBu (1.09g, 1.91mmol) in 4N HCl in dioxane (20ml) was stirred for 4 hours and solvent removed. The product, Glu(AZT) (0.89g,
1.99mmol, quant.), was obtained as a yellow glass: 1H NMR (D2O) δ 1.89 (s. 3H,
AZT CH3), 2.21 (m, 4H, Glu-β H and AZT 2' CH2), 2.58 (m, 2H, Glu-γ H), 3.70 (t,
IH, Glu-α H), 4.05-4.41 (m, 4H, AZT 4' CH, 3' CH and 5' CH2), 6.18 (t, IH, AZT 1' CH), 7.51 (s, IH, AZT 6 CH). EXAMPLE 14
Threonine NCA
To a mixture of Thr-OtBu (0.500g, 2.85mmol) in THF (25ml) was added triphosgene (0.677g, 2.28mmol). The resulting solution was stirred at reflux for 3 hours. The solution was evaporated to dryness to obtain Thr-NCA (0.500g, 2.48mmol, 87%) as a white solid. Thr-NCA was used without further characterization.
EXAMPLE 15
Preparation of a DRUG-GLU conjugate as a starting synthon for polymerization
With non-primary amine drug candidates, formation of the Drug-poly-Glu conjugate may prove problematic. To overcome this difficulty, the following scheme was used, wherein the drug is first conjugated to Glu, and this synthon is then used to initiated coupling. The protocol has been successfully applied to sertraline and to metoclopramide. Protocol for coupling Boc-Glu(OtBu)-OH to Sertraline
1. Boc-Glu(OtBu)-OH (0.44 g, 1.46 mmol) and PyBOP (0.84 g, 1.60 mmol) were dissolved in dry DMF (15 mL) with stirring.
2. DIEA (0.31 mL, 1.75 mmol) was added and the amino acid derivative was allowed to activate for 15 minutes.
3. Sertraline hydrochloride (0.50 g, 1.46 mmol) was added to the stining mixture followed by an additional 0.31 mL DIEA. 4. The mixture was allowed to stir for 16 h.
5. The solution was stripped yielding a brown oil.
6. The oil was dissolved in EtOAc (100 mL) and the resulting solution was washed with 10 % HCl (3 x 30 mL), saturated NaHCO3, 4M NaHSO4, and brine (2 x 30 mL, respectively). 7. The solution was dried over MgSO4, filtered and the solvent was removed by rotary evaporation under reduced pressure, yielding a light brown oil. 8. The oil was dried on the vacuum manifold and the product was purified by column chromatography on silica gel using EtOAc/Hexanes 1:5 to 1:4 solvent system.
9. The product fractions were pooled and solvent was again removed by rotary evaporation yielding 0.85 g (99%) of the final product, Sertraline-NH-C(O)-Glu- NH3+.
10. The preparation was dried on the vacuum manifold.
EXAMPLE 16
Synthesis of Poly-Lysine-Ibuprofen
I. Preparation of Ibuprofen-O-Succinimide (RI-172) (Grafe & Hoffman, Pliarmazie 55: 286-292, 2000)
To a stirring solution of ibuprofen (2.06 g, 10 mmol) in 5 mL of dioxane at room temperature was added a solution of dicyclohexylcarbodiimide (DCC, 2.27 g, 11 mmol) in 25 mL of dioxane. After 10 minutes a solution of N-hydroxysuccinimide (NHS, 1.16 g, 10 mmol) in 15 mL of dioxane was added. The reaction mixture was allowed to stir at room temperature for 5 hours and then filtered through a sintered glass funnel to remove the dicyclohexylurea (DCU). After rotary evaporation, the product was crystallized from methylene chloride/hexanes to yield 2.36 g (78%) of a
colorless solid. 1H-NMR (dmso-d6): δ 0.86 (d, 6, CH3), 1.49 (d, 3,α- CH3), 1.81 (m,
1, CH), 2.43 (d, 2, CH_), 3.33 (m, 4, CH2CH2), 4.22 (q, 1, CH), 7.16 (d, 2, ArH), 7.28 (d, s, ArH).
π. Conjugation of Poly-Lysine with Ibuprofen-O-Succinimde (RI-197)
Poly-lysine-HBr (Sigma, 100 mg, 34.5nmol) was dissolved in 1 mL of water that had brought to a pH of 8 with sodium bicarbonate, and stirred at room temperature. To this solution was added a solution of ibuprofen-O-succinimide (116 mg, 380 nmol) in 2 mL of dioxane. After stirring overnight, the dioxane was removed by rotary evaporation and diluted with 10 mL of pH 8 sodium bicarbonate in water. The precipitated product was filtered through a sintered glass funnel and washed with 3 X 10 mL of water and 4 X 10 mL of diethyl ether. After drying overnight by high vacuum the solid product was scraped out yielding 105 mg (62%). 1H-NMR (dmso-
d6): δ 0.85 (br s, 6, CH3), 1.27 (br s, 3,α- CH3), 1.40-1.79 (m, 5, CH of ibu and lysine
γand δ CH2CH2), 2.31 (d, 2, β CH2), 2.41-2.52, under dmso (m, 2, β CH2), 2.73-3.01
(m, 2, ε CH2), 3.51-3.85 (m, 1 ibu CH), 4.01-4.43 (m, 1, α CH), 7.14 (d, 2, ArH), 7.6
(d, 2, ArH), 7.90-8.06 (m, 2, NH). EXAMPLE 17 Summary of the synthesis of [Lysine]** -[Gemfibrozil or Naproxen] or [Glu]** L- DOPA Synthesis of [Glu]15 - L-dihydroxyphenylalanine or [Glu]15-L-DOPA
L-DOPA (0.050 g, 254 Dmol) and GluNCA (0.666 g, 3.85 mmol) were dissolved in 6 ml DMF. After stirring overnight under Argon, the reaction was examined by thin layer chromatography (9: 1 H2O: HO Ac) showed some free drug (Rf= 0.70) and a more polar spot presumed to be polymer (Rf= 0.27). The reaction
was quenched by the addition of 12 ml H2O. The pH was adjusted to pH 1-2 using IN HCl. The solvent was removed by rotary evaporation and the viscous residue dried in vacuum. The resultant syrup was transferred to a new vessel in H2O and lyophilized. The resulting crystals were off white to light brown. Yield: 0.470 g, 62%. 1H NMR showed pyroglutamic acid contamination; therefore, the material was suspended in H2O and ultrafiltered (Millipore, regenerated cellulose, YMl, NMWL =1000), and the retentate dried under vacuum. Yield: 0.298 grams. 1H NMR (500MHz, DMSO) indicated a relative ratio of 30:1 Glu:L-DOPA, 6.6 (L-DOPA
aromatic), 6.4 (L-DOPA aromatic), 4.1 (Glu, c )
1.85 (Glu, β), 2.25 (Glu, γ5 L-DOPA), 2.3 (L-DOPA, benzylic), 12.4-11.5 (Glu,
CO2H), 8.0 (Glu, amide)
Synthesis of [Glu] 10 -L-DOPA
As in the synthesis of [Glu]15-L-DOPA except 0.439 grams of GluNCA were used. The final yield of purified material was 0.007 grams. The 1H NMR (500MHz, DMSO) indicates 8:1 Glu:L-DOPA.
Synthesis of Naproxen-Succinimide
To Naproxen (2.303 g, 10 mmol) in 5 ml of dioxane was added N- hydroxysuccinimide (1.16 g, 10 mmol) dissolved in 15 ml of dioxane and dicyclohexylcarbodiimide (2.27 g, 1 lmmol) in 25 ml of dioxane. The reaction was stirred overnight and the insoluble dicyclohexylurea removed by filtration. The solvent was removed by rotary evaporation and the residue dissolved in 30-40 ml
CH2CI2. Approximately 10 ml hexane was added and the mixture was chilled to 4°C
for 2 hr. Additional hexane was added dropwise until small planar white crystals
began to form and the solution was refrigerated overnight. The activated ester was harvested, washed with hexane and dried in vacuum (2.30 g, 70.0 %): 1H NMR (500MHz, DMSO) 1.70 (d, 3H, CH3) 2.9 (s, 4H, succinimide), 3.91 (s, 3H, OCH3), 4.18 (q, IH, methine) 7.75-7.12 (m, 6H, aromatic).
Synthesis of polylysine-Naproxen
To [Lys]i4 • 14 ■ HBr (0.100 g, 35 mmol) in 1 ml of H O (containing 10 mg/ml Na2CO3) was added Naproxen-Succinimide (0.124 g, 379 mmol) in 2 ml of dioxane. After stirring overnight a precipitate formed. More precipitate was formed by the addition of 30^-0 ml of H2O (containing 10 mg/ml Na2CO3), isolated by filtration and washed with 50 ml of Et2θ. The fine white powder was dried (0.095 g, 53%): 1H NMR (500MHz, DMSO) 8.1 (m, IH, lysine; amide), 7.8-7.0 (m, 6H, aromatic), 4.4- 4.1 (m, 2H, q methine), 3.3 (s, 3H, OCH3), 2.8 (m, 2H, ε), 1.7-1.0 (m, 9H, β, γ, δ, CH3).
Synthesis of Gemfibrozil - Succinimide
To Gemfibrozil (GEM) (5.0 g, 20.0 mmol) in 30 ml dioxane was added N- hydroxysuccinimide (2.3 g, 20.0 mmol) in 20 ml dioxane and dicyclohexylcarbodiimide (4.5 g, 22.0 mmol) in 50 ml dioxane. The reaction was stirred overnight and the insoluble dicyclohexylurea removed by filtration. The solvent was removed by rotary evaporation and the residue dissolved in 15 - 20 ml of CH2CI2. Hexane was added dropwise until crystal formation was seen and the mixture was chilled to 4° C overnight. Approximately 3 ml of additional n-hexane was added and the mixture chilled to -20° C overnight. The activated ester formed small planer crystals and was harvested, washed with hexane and dried in vacuum
(5.8 g, 80%): 1H NMR (500 MHz, DMSO) 1.2, 1.3 (s, 6H, CH3), 1.8-1.5 (m, 6H, GEM CH2), 2.3-2.1 (s, 6H, aromatic CH3) 2.85-2.7 (d, 4H, succinimide CH2), 7.0-6.6 (m, 3H, aromatic).
Synthesis of polylysine-Gemfibrozil
To [Lys]π IT HBr (0.100 g, 43.5 αmol) in 1 ml of H2O (containing 10 mg/ml Na2C03) was added Gemfibrozil-succinimide (0.094 g, 261.1 αmol) in 2 ml dioxane. After stimng overnight a precipitate formed. More precipitate was formed by the addition of 30 ml of H2O (containing 10 mg/ml Na2C03), isolated and washed with 50 ml Et2O. The fine white powder was dried (0.019 g, 1 %): 1H NMR
(500MHz, DMSO) 1.5-1.0 (m, 12H, β, γ„δ, CH3), 1.85-1.5 (m, 4H, CH2), 2.3, 2.1 (s, 6H, aromatic CH3), 3.35 (s, 2H, ε), 3.85 (s, 2H, OCH2), 4.05 (s, IH, α), 5.6 (d, IH, carbamate), 7.0-6.7 (m, 3H, aromatic), 8.0 (d, IH, amide).
EXAMPLE 18
All reagents were used as received. JH NMR was run on a Bruker 300 MHz (300) or JEOL 500 MHz (500) NMR spectrophotometer using tetramethylsilane as an internal standard. Thin layer chromatography was performed using plates precoated with silica gel 60 F254. Flash chromatography was performed using silica gel 60 (230- 400 mesh).
Preparation of polyArg Method 1
To H-Arg(Z) 2-OH (0.300 g, 0.68 mmol) in 3.0 ml dry DMSO was added diphenylphosphorylazide (219 μl, 1.02 mmol) and triethylamine (236 μl, 1.69 mmol).
The reaction was stirred for 48 h under Ar upon which the solution was poured into 100 ml H2O. The resulting heterogeneous solution was centrifuged to isolate the white precipitate which was washed 3 x 100 ml H2O, 3 x 100 ml CH2OH and 100 Et2O and then vacuumed dried to obtain 172 mg of an off white solid: 1H NMR (500 MHz, DMSO) 7.31 (m, 10H), 5.21 (m, IH, benzylic), 5.01 (m, IH, benzylic), 3.83 (m, IH, α), 3.34 (m, 2H, δ) 1.54 (m, 4H, β, γ).
This material was dissolved in 1.5 ml dry anisole and stirred with 0.3 ml anhydrous methanesulfonic acid for 3 h upon which another 0.3 ml anhydrous methanesulfonic acid was added and the solution stirred for 1 h. The reaction mixture was poured into 6 ml Et2θ and refrigerated for 15 m. The heterogeneous biphasic mixture was concentrated to 0.5 ml by rotary evaporation. Thrice, an additional 8 ml Et2θ was added and the biphasic mixture centrifuged and the supernatant removed leaving a yellowish gum. This residue was washed twice with 6 ml acetone, centrifuged and the supernatant discarded leaving behind a white-yellow residue. The residue was dissolved in 0.3 ml H2O and shaken with Amberlite IRA-400. The resin was removed by filtration and washed with 3 ml H2O. The combined eluent and wash were dried in vacuum yielding a yellow film 0.063 g, (90% yield): 1H NMR (500 MHz, D2O) 4.37 (m, IH, α), 3.22 (m, 2H, δ) 1.94-1.66 (m, 4H, β, γ); MALDI-MS shows a degree of polymerization varying between six to fourteen residues.
Method 2
To Boc-Arg(Z) 2-OH (0.025 g, 0.05 mmol) and H-Arg(Z) 2-OH (0.280 g, 0.63 mmol) in 3.0 ml dry DMSO was added diphenylphosphorylazide (219 μl, 1.02 mmol) and triethylamine (236 ul, 1.69 mmol). The reaction was stirred for 48 h and then poured into 100 ml H2O. The heterogeneous solution was centrifuged and the
precipitate washed 3 x 100 ml H2O, 3 x 100 ml CH3OH and 100 Et2O and then vacuumed dried to obtain 132 mg of solid: 1H NMR (500 MHz, DMSO) 7.31 (m, 10H), 5.21 (m, IH, benzylic), 5.01 (m, IH, benzylic), 3.83 (m, IH, α), 3.34 (m, 2H, δ) 1.54 (m, 4H, β, γ). The protected polymer was dissolved in 1.5 ml dry anisole and stirred with 1.3 ml anhyd methanesulfonic acid for 4 h. The solution was concentrated to 0.5 ml by rotary evaporation. Et2θ (8 ml) was added and the biphasic system centrifuged and the supernatant discarded. Thrice, 10 ml acetone was added, the solution centrifuged and the supernatant discarded. The pellet was dried overnight in vacuum and then dissolved in 0.3 ml H2O and shaken with Amberlite IRA-400. The resin was removed by filtration and washed with 3 ml H2O. The combined eluent and wash were dried in vacuum yielding a yellow film 0.019, (24% yield); 1H NMR (500 MHz, D2O) 4.37 (m, IH, α), 3.22 (m, 2H, δ) 1.94-1.66 (m, 4H, β, γ); MALDI-MS shows a degree of polymerization varying between five to eleven residues.
Preparation of T4 Conjugates
T4 conjugated to aminoacid polymers were either prepared by coupling (protected) T4 to commercially available aminoacid homopolymers or incorporated by polymerization of a T4 moiety with the corresponding N-carboxyanhydride aminoacid.
T4 Conjugation to preformed homopolymers
To N-TeocT4 (0.017 g, 17 μmol) in 1 ml dry DMF was added dicyclohexylcarbodiimide (0.004 g, 18 μmol). After stirring for 30 minutes N- dimethyl-4-aminopyridine (0.004 g, 36 μmol) and Gly18 (0.017 g, 17 μmol) were
added and the reaction stireed overnight. The cloudy solution was poured into 20 ml H2O and extracted twice with 10 ml CH2CI2. The aqueous component was acidified
to pH 3 with 1 N HCl and chilled to 4° C. The material was isolated by centrifugation
and the pellet thrice washed with 8 ml H2O. The pellet was dried in vacuum to yield dicyclohexylurea and N-TeocT4-Gly18: 1H NMR (500 DMSO) 7.8 (T4 aromatic), 7.1 (T4 aromatic), 4.1 (α).
To the impure protected polymer was added 2 ml trifluoroacetic acid. The reaction was stirred for 2 h and the solvent removed by rotary evaporation. The residue was dissolved in 1 ml DMF and the insoluble material removed by filtration. The DMF was removed by rotary evaporation and dried in vacuum to yield a white material (.012 g, 40%): 1H NMR (500 DMSO) 7.75 (T4 aromatic), 7.08 (T4 aromatic), 4.11 (bs, α).
Preparation of aminoacid NCA. To the L-aminoacid (1.5 g) in 100 ml dry THF was added triphosgene (0.8 eqv). The reaction was vessel was equipped with a reflux condenser and NaOH trap and heated to reflux for 3 h. The solvent was removed by rotary evaporation and the residue washed with hexane to yield the aminoacid NCA as white residue.
LeuNCA: 1H NMR (500 CDC13) 6.65 (s, IH, NH), 4.33 (dd, IH, α), 1.82 (m, 2H, β), 1.68 (m, IH, γ), 0.98 (dd, 6H, δ)..
PheNCA: 1H NMR (500 CDC13) 7.36-7.18 (m, 5H), 5.84 (s, IH, NH), 4.53 (dd, IH), 3.28 (dd, IH, α), 2.98 (dd, IH, β).
Trp(Boc)NCA: : 1H NMR (500 CDC13) 8.14 (d, IH), 7.49 (d, 2H), 7.36 (t, IH), 7.27 (m, IH), 5.90 (s, IH, NH), 4.59 (dd, IH, α), 3.41 (dd, IH, β), 3.07 (dd, IH, β), 1.67 (s, 9H, t-Bu).
fleNCA: 1H NMR (300 CDC13) 6.65 (s, IH, NH), 4.25 (d, IH, α), 1.94 (m,
IH, β), 1.43 (dm, 2H, γ-CH2), 1.03 (d, 3H, γ-CH3), 0.94 (t, 3H, δ).
Lys(Boc)NCA: 1H NMR (500 CDC13) 6.65 (bs, IH, NtH), 4.64 (s, IH, carbamate NH), 4.31 (t, IH, α), 3.13 (s, 2H, ε), 2.04 (m, 2H, β), 1.84 (m, 2H, δ), 1.48 (m, HH, γ, t-Bu).
MefNCA: 1H NMR (500 CDC13) 6.89 (s, IH, NH), 4.50 (dd, IH, α), 2.69 (t, 2H, γ), 2.10 (m, IH, β), 2.08 (m, 4H, β, δ).
Typical preparation of T4 N-capped homopolymers: T4-Leu15
To fleNCA (0.200 g, 1.3 μmol) in 2.5 ml DMF was added isoleucine (0.012 g, 0.1 μmol). After stirring overnight under Ar T4-NCA (0.037 g, 0.050 μmol) was added and the reaction stined an additional 72 h. The white solution was added to 8
ml H2O. The heterogeneous solution was chilled to 4° C, centrifuged and the
supernatant discarded and the pellet washed with 8 ml H2O. The dried residue was
washed with 50 ml ethanol warmed to 50° C to yield after drying, a white powder
(0.124 g, 55%): 1H NMR (500 DMSO) 7.75 (s, T4 aromatic), 7.08 (s, T4 aromatic), 4.11 (dd, α), 1.77 (m, β), 1.38 (m, β, γ-CH), 0.91 (m, γ-CH, γ-CH3, δ).
T4-Phe15
White powder (58%): 1H NMR (360 MHz, DMSO) 7.0-8.1 (NH, aromatics), 4.5 (α),
3.0 (β); MALDI-MS indicates T4-Ph_ι_5.
T4-Met15
White powder (10%): 1H NMR (500MHz, DMSO) 8.0-8.5 (amide NH) , 4.4 (α) 2.5
(γ), 2.05 (e). 2.0-1.7 (β).
T4-Vali5 White powder (14%): 1H NMR (500MHz, DMSO) 7.75 (T4 aromatic), 7.08 (T4 aromatic), 4.35 (α), 3.45 (β), 1.05 (γ).
For those conjugates that used a protected NCA an additional, separate deprotection step was necessary:
To T4-[Lys(Boc)]15 (0.256 g, 61 μmol) in 10 ml of CH2C12 was stined with trifluoroacetic acid (10 ml) for 2 h. The solvent was removed by rotary evaporation and the residue dissolved in 3 ml H2O and ultrafiltered (Amicon regenerated cellulose, YMl, NMWL 1000, wash with 30 ml pH 5 H2O). The retentate was dried in vacuum to give a light brown residue: 1H NMR (500 D2O) 7.82 (s, T4 aromatic),
7.41 (s, T4 aromatic), 4.29 (bs, α), 3.00 (bs, ε), 2.13-1.70 (m, β, δ, γ); MALDI-MS gives a range T4-Lys .11.
T4-Trp15: 1H NMR (500 DMSO) 8.25-6.80 (m, aromatic), 4.50 (bs, α), 3.40 (bs, β), 3.00 (bs, β).
Typical preparation of T4 C-capped homopolymers:
To T4 (0.078 g, 100 μmol) in 10 ml dry DMF was added Trp(Boc)NCA (0.500 g, 1.514 mmol). After stirring for 64 h under Ar the reaction was quenched by
adding 30 ml H2O. The cloudy white solution was chilled to 4° C, centrifuged and
the pellet washed three times with 25 ml H2O. The residue was dried in vacuum to provide Trp(Boc)15-T4 as a brown solid. This material was further purified by ultrafiltration (Amicon regenerated cellulose, YMl, NMWL 1000, wash with 30 ml pH 5 H2O) to provide [Trp(Boc)]15-T4 as a brown-gold solid (0.400 g, 79%): 1H NMR (500 DMSO) 8.25-6.80 (m, aromatic), 4.50 (bs, α), 3.40 (bs, β), 3.00 (bs, β), 1.50 (bs, t-Bu).
To [Trp(Boc)]15-T4 (0.509 g) in 8 ml of 1:1 CH2C12: trifluoroacetic acid was stined for 1.5 h. The solvent was removed by rotary evaporation and the residue dried in vacuum to yield a brown solid (0.347 g, 97%): 1H NMR (500 DMSO) 8.25- 6.80 (m, aromatic), 4.50 (bs, β), 3.40 (bs, α), 3.00 (bs, β).
[Lys(Boc)]15-T4: 1H NMR (500 D2O) 7.82 (s, T4 aromatic), 7.41 (s, T4 aromatic), 4.29 (bs, α), 3.00 (bs, ε), 2.13-1.70 (m, β, δ, γ).
Lys15-T4: 1H NMR (500 D2O) 7.82 (s, T4 aromatic), 7.41 (s, T4 aromatic), 4.29 (bs, α), 3.00 (bs, ε), 2.13-1.70 (m, β, δ, γ).
Typical preparation of random T4/homopolymers:
To T4NCA (0.065 g, 0.1 mmol) and Trp(Boc)NCA (0.400 g, 1.2 mmol) were combined in 4 ml dry DMF. Triethylamine (11 μl, 0.1 mmol) was added and the
reaction stined for 44 h under Ar. After quenching by the addition of 10 ml H2O the
heterogeneous mix was chilled to 4° C and centrifuged. The pellet was isolated and
washed three times with 10 ml H2O and dried in vacuum.
To the random T4/[Trp(Boc)]15 polymer was added 10 ml 1:1 CH2C12: trifluoroacetic acid and the reaction stined for 1 h. The solvent was removed by rotary evaporation to provide the deprotected polymer as a brown solid (0.262 g, 91%) which was further purified by ultrafiltration (Amicon regenerated cellulose, YMl, NMWL 1000, wash with 30 ml pH 5 H2O): 1H NMR (500 DMSO), 8.25-6.80 (m, aromatic), 4.50 (bs, α), 3.40 (bs, β), 3.00 (bs, β).
Random T4/Lys15: 1H NMR (500 D2O); 7.82 (s, T4 aromatic), 7.41 (s, T4 aromatic), 4.29 (bs, α), 3.00 (bs, ε), 2.13-1.70 (m, β, δ, γ).
Prparation of PolyLysine Depakote
To valproic acid (1.0 g, 6.9 mmol) in 14 ml 6: 1 CH2C12:DMF was added N- hydroxysuccinimide (0.8 g, 6.9 mmol), dicyclohexylcarbodiimide (1.6 g, 7.6 mmol) and triethylamine (0.9 g, 8.9 mmol). The reaction was stirred for 60 h whereupon the solution was filtered to remove the white precipitate and the solvent removed by rotary evaporation. The residue was purified by flash chromatography (10: 1-2: 1 hexane:EtOAc) to provide the succinimidyl ester as a clear oil (1.0 g, 59%): Rf (3:1 hexane:EtOAc) 0.43; 1H NMR (300 MHz, CDC13) 2.76 (s, 4H, succinimide), 2.61 (m, IH, methine), 1.65-1.19 (m, 8H, methylene), 0.88 (t, 6H, methyl).
To Lysι4 'HBr (0.106 g, 37 μmol) in 0.8 ml H2O pH 8 was added the valproic succinimidyl ester (0.104 g, 431 μmol) dissolved in 0.4 ml THF. The reaction was stirred overnight whereupon 8 ml H2O was added. The mixture was acidified to pH 3
with 6 M HCl and extracted twice with 2 ml CH2C12. The aqueous layer was dried and the residue dissolved in 1 ml H2O. The solution was purified by SEC (G-15, 10 ml dry volume) and eluted with water. Those fractions containing conjugate were combined and dried to yield a white solid (0.176 mg) which by NMR indicated 28 Lysine for every one drag molecule; !H NMR (D2O) 4.29 (m, IH, α), 3.00 (rα, 2H, ε), 1.87-1.68 (m, 4H, β, δ), 1.43 (m, γ, methylene), 0.85 (t, methyl).
Preparation of PolyGlu Mevastatin
AcNGlu15(3-mevastatin)2 To polyGlu15 (0.116 g, 69 μmol) in 3 ml dry DMF was added 1 ml pyridine and acetic anhydride (20 μl, 207 μmol). After stining for 21 h the mixture was
acidified with 6 N HCl until pH 1 and then cooled to 4° C. The white precipitate was
collected by centrifugation and washed three times with H.O and then dried under vacuum to yield 11 mg of N-acetylated polyGlu15. To N-acetylated polyGlu15 (0.011 g, 7 α mol) in 4.8 ml dry DMF was added dicyclohexylcarbodiimide (0.022 g, 108 μmol). After stirring twenty minutes the heterogeneous solution was filtered to remove insoluble dicyclohexylurea and combined with mevastatin (0.042 g, 108 μmol) and N-dimethyl-4-aminopyridine (0.013 g, 108 μmol). The mixture stined for 23 h whereupon the reaction was quenched by the addition of 20 ml H2O. The solution was extracted twice with 10 ml
CHCI3. The aqueous component was adjusted to pH 3 with 1 N HCl and cooled to 4°
C. The resultant white precipitate was isolated by centrifugation and washed three times with 8 ml H2O. The solid was dissolved in 1 ml H2O and washed with 1 ml CH2Ci2 and twice with 2 ml EtOAc. The aqueous layer was acidified to pH 3 with 1
N HCl, cooled to 4° C, the precipitate isolated by centrifugation and washed twice
with 2 ml H2O. The dried conjugate (2 mg) was shown by 1H NMR to contain fifteen Glu for every two mevastatin molecules: 1H NMR (500 MHz, DMSO) 5.92 (5' mevastatin), 5.72 (3' mevastatin), 5.19 (4' mevastatin), 5.17 (8' mevastatin), 5.12 (3 mevastatin), 4.41 (5 mevastatin), 4.03 (α, Glu), 2.25 (γ, Glu), 1.88 (β, Glu), 0.82 (4",2' allylic methyl mevastatin), 1.17 (2" mevastatin).
Glu15(3-mevastatin) (160)
To Glu15 (0.151 g, 77 μmol) in 3 ml dry DMF was added dicyclohexylcarbodiimide (0.239 g, 1.159 mmol) and the reaction stirred for 4 h under Ar. The white precipitate was removed and N-dimethyl-4-aminopyridine (0.141 g, 1.159 mmol) and mevastatin (0.222 g, 0.569 mmol) were added dissolved in 10 ml CHC13. The reaction stined for 21 h under Ar whereupon the precipitate was removed. The solution was concentrated by rotary evaporation and added to 40 ml saturated NaCl (aq) adjusted so pH 8. The homogeneous solution was extracted three times with 20 ml CHC13 and then ultrafiltered (Amicon regenerated cellulose, YMl, NMWL 1,000). The retentate was dried in vacuum to yield 8 mg of a white residue which showed a ratio of 15 Glutamic acids to one mevastatin by 1H NMR (500 D2O); 5.92 (5' mevastatin), 5.72 (3' mevastatin), 5.19 (4' mevastatin), 5.17 (8' mevastatin), 5.12 (3 mevastatin), 4.41 (5 mevastatin), 4.03 (α, Glu), 2.25 (γ, Glu), 1.88 (β, Glu), 0.82 (4",2' allylic methyl mevastatin), 1.17 (2" mevastatin).
BocGlu(3-mevastatin)O-t-Bu
To BocGlu(OSu)O-t-Bu (0.181 g, 453 α mol) and mevastatin (0.177 g, 453 μmol) in 40 ml CHC13 was added N-dimethyl-4-aminopyridine (0.055 g, 453 μmol).
The reaction was heated to reflux for 7 h under Ar and then allowed to stir at 20° C
for 8 h. The solvent was removed by rotary evaporation and the residue purified by flash chromatography (8:1-1:1 hexane:EtOAc) to provide the conjugate as a clear film (0.038 g, 11%): Rf (3:1 hexane:EtOAc) 0.22; 1H NMR (CDC13 500 MHz) 5.97 (d, IH, 5'), 5.73 (dd, IH, 3'), 5.55 (s, IH, 4'), 5.32 (s, IH, 8'), 5.24 (dd, IH, 3), 5.09 (d, IH, NH), 4.48 (m, IH, 5), 4.20 (m, IH, α), 2.78 (m, 2H, 2), 2.37 (m. 4H, 2\ 2", γ), 1.45 (s, 18H, t-Bu), 1.12 (d, 3H, 2"-CH3), 0.88 (m, 6H, 4", 2'-CH3).
Preparation of PolyGlu Prednisone
BocGlu(21 -Prednisone)O-t-Bu
To BocGlu-O-t-Bu (0.400 g, 1.32 mmol) in 20 ml CHC13 was added dicyclohexylcarbodiimide (0.544 g, 2.64 mmol). The reaction was stined for 1 h and filtered to remove insoluble dicyclohexylurea. N-dimethyl-4-aminopyridine (0.320 g, 2.64 mmol) and prednisone (0.472 g, 1.32 mmol) was added. The reaction was stined for 60 h and filtered. The solvent was removed by rotary evaporation and the residue purified by flash chromatography (10:1-0:1 hexane:EtOAc) to provide the target as a clear film (0.256 g, 31%): Rf (6: 1 CHCl3:MeOH) 0.54; 1H NMR (CDC13 500 MHz) 7.68 (d, IH, 1), 6.16 (d, IH, 2), 6.04 (s, IH, 4), 5.15 (d, IH, NH), 5.03 (d, IH, 21), 4.71 (d, IH, 21), 4.08 (t, IH, α), 1.40 (s, 18H, t-Bu).
Glu(21-Prednisone) To BocGlu(21-Prednisone)O-t-Bu (0.060 g, 93 μmol) in 15 ml CH2C12 was stined for 1 h with trifluoroacetic acid (1.5 ml). The solvent was removed by rotary evaporation and the residue purified by flash chromatography (8:1 CHCl3:MeOH) to yield a clear film: Rf (6:1 CHCl3:MeOH) 0.13 1H NMR (CDCI3 500 MHz) 7.72 (d, IH, 1), 6.25 (d, IH, 2), 6.14 (s, IH, 4), 5.14 (d, IH, 21), 4.75 (d, IH, 21), 4.10 (t, IH, α).
EXAMPLE 19
Amine-Initiated Polymerization of L-Glutamic Acid NCA
The following procedure was successfully used to synthesize the polyglutamic acid conjugate of atenolol.
MW (g/mole) 266.3 173 1538 (n=10)
Mass (mg) 77 500 446 = 100% mmoles 0.29 2.89 0.29 equivalents 1 10 1
DMF is dimethylformamide, anhydrous, and was purchased from Aldrich. Glassware was oven-dried prior to use. 1. Glu-NCA (500 mg, 2.89 mmoles) was dissolved in 4 mL of DMF and stined under Ar in a 15 mL roundbottom flask equipped with a gas inlet tube.
2. Atenolol, dissolved in 1 mL of DMF, was added to this solution of Glu-NCA and allowed to stir at room temperature for 72 h. In general, the reactions can be run until there is no free amine initiator by tic. For this reaction, tic was run using silica plates and eluting with 20% methanol in ethyl acetate.
3. The reaction was quenched by pouring into 20 mL of 10% sodium bicarbonate in water (pH = 8).
4. The water was washed with 3 X 20 mL of methylene chloride and 3 X 20 mL of ethyl acetate.
5. Combined aqueous layers were brought to a pH of 6 with 6N HCl and reduced to a volume of about 20 mL by rotary evaporation. This solution was then cooled in the refrigerator for > 3 hours.
6. To precipitate the polymeric product, the aqueous solution was then acidified to a pH of about 2 using 6N HCl and placed back in the refrigerator for 1-2 hours.
7. The suspension was poured by portions into a 10 mL test tube and centrifuged for 15 minutes until the precipitate formed a solid pack at the bottom of the tube from which the water could be decanted. (At this point in the general procedure, it is preferable that the solid be filtered through a filter funnel and washed with acidic water. The centrifuge was used for atenolol because the solid was too thin to filter.)
8. The solid was then resuspended in acidic water (pH about 2) and vortexed before being centrifuged again and the water decanted. This procedure was repeated once more for a total of three washes.
9. The solid was then dried by high vacuum overnight yielding 262 mg (59%) of polymer. NMR analysis indicated that the Glu/Atenolol ratio was about 30/1.
EXAMPLE 20
Monolayers of Caco-2 human intestinal epithelial cells are increasingly being used to predict the absorption of orally delivered drags. We used the Caco-2 transwell system and other in vitro assays to evaluate the performance of Polythroid. Our findings indicate that Polythroid may enhance oral delivery of thyroid hormones for the treatment of hypothyroid disorders.
IN VITRO PERFORMANCE
Caco-2 human intestinal epithelial cell assay Caco-2 cells are grown on the surface of collagen coated wells in a 24 well format to form confluent monolayers that represent small segments of the intestine. The wells are removable and contain a top chamber representing the apical side (facing the lumen of the intestine) and a bottom chamber representing the basolateral side (site of serosal drag absorption). The integrity of the epithelial barrier is monitored by testing the electrical resistance across the monolayer. Absorption of drugs can be studied by adding sample to the apical side and assaying the concentration of the drag in the basolateral chamber following incubation.
Intestinal epithelial cell proteases digest Polythroid Polythroid is a synthetic polymer of glutamic acid with T4 and T3 covalently attached by a peptide bond linkage. The polymer is the delivery vehicle for the thyroid hormones and is not designed to cross the intestinal banier itself. Rather, it is designed to release T4 and T3 in a time dependent manner. Release of the thyroid hormones is dependent on the enzymatic cleavage of the glutamic acid polymer. In theory, this will result from Polythroid encountering proteolytic enzymes as it descends the intestinal tract. Proteins are digested into small polypeptides by gastric pepsin and pancreatic enzymes secreted into the small intestine. Intestinal epithelial cells then function to further breakdown the small polypeptides. They accomplish this with proteolytic enzymes referred to as brush border proteases that are attached to the cell surface.
Monitoring the effect of brash border peptidases on Polythroid required development of an assay to specifically distinguish Polythroid from polyglutamic acid and the thyroid hormones. Therefore, we developed an enzyme-linked immunosorbent assay (ELISA) that specifically recognizes Polythroid. The assay employs antibodies against the glutamic acid polymer to capture Polythroid and antibodies to T4 or T3 to detect the presence of Polythroid. The assay has no cross- reactivity with polyglutamic acid or the thyroid hormones themselves. Consequently, proteolytic degradation of Polythroid results in T4 and T3 release from the polymer and a corresponding decrease in ELISA reactivity. The Polythroid specific ELISA can, therefore, be used to monitor the breakdown of Polythroid.
The Polythroid specific assay was used to analyze in situ digestion of Polythroid in Caco-2 cell cultures. Different concentrations of Polythroid were added
to the apical side of Caco-2 cells and incubated for 4 hours in PBS at 37°C (n=4). The
apical side Polythroid concentration was measured by Polythroid specific ELISA before and after the 4 hour incubation (Fig. 6). At the relatively high concentration of 100 micrograms, 26% of Polythroid was degraded, whereas at a 10-fold lower concentration 84% of the Polythroid was degraded. When a concentration of 0.5 micrograms was added (closer to the concentrations that would be encountered by the intestine in a normal human dose) the amount of Polythroid remaining after 4 hours of incubation was below the limit of detection for the ELISA (10 ng) indicating essentially complete digestion. The loss of Polymer in the apical chamber was not due to absorption of Polythroid across the monolayer since the basolateral chamber contained no detectable Polythroid in any of the experiments (see below). We cannot
rule out cellular uptake of Polythroid, however, enzymatic digestion is likely to account for most, if not all, of the decrease in Polythroid concentration on the apical side. At the higher concentrations, it would be difficult for cellular uptake to account for such a large difference in the remaining Polythroid.
Polythroid enhances absorption of T4 across Caco-2 monolayers Absorption of T4 was monitored in the Caco-2 transwell system (n=4). Polythroid (10 micrograms) was added to the apical side of the transwells. T4 was added to the apical side at a concentration equal to the T4 content of Polythroid. A commercial ELISA for T4 was used to determine the level of T4 in
the basolateral chamber following incubation for 4 hours at 37°C (Fig. 7). A
significantly higher amount of T4 was absorbed from Polythroid as compared to CaCo-2 cells incubated with the amount of T4 equivalent to that contained in the polymer .
Polythroid does not cross Caco-2 monolayers
In order to determine if Polythroid itself crosses the Caco-2 monolayer we used the Polythroid specific ELISA to measure the amount of polymer in the basolateral chamber after incubation with Polythroid at a high concentration (100 micrograms). After 4 hours incubation, samples (n=4) from the basolateral side showed no reactivity in the ELISA (Fig. 8). The limit of detection for Polythroid is 10 ng, therefore, less than 1/10,000 of the Polythroid was absorbed. In conclusion, within the limits of ELISA detection, Polythroid does not cross the Caco-2 monolayer.
Digestion of Polythroid in gastric and intestinal simulators
Pepsin secreted by the gastric mucosa is the only protease active in the acid conditions of the stomach. The pancreas secretes a number of proteolytic enzymes into the intestine which degrade proteins and polypeptides. In theory, these endogenous proteases will participate in release of T4 and T3 from Polythroid as the polymer descends the intestinal tract.
We tested Polythroid in the USP gastric simulator and the USP intestinal simulator and compared the levels of digestion for Polythroid synthesized by different methods. The samples of Polythroid varied in the position of thyroid hormone attachment. Samples were dissolved in gastric simulator buffer containing pepsin or in intestinal simulator buffer containing pancreatic enzyme extract (pancreatin) and incubated for
24 hours at 37°C. Following digestion, samples were analyzed by HPLC for the
content of released monomeric T4 and T3. Figures 9and 10 show the levels of T4 and T3 following digestion in the gastric and intestinal simulators. Release varied depending on the position of thyroid hormone attachment. Polythroid with T4 and T3 attached at the C-terminus (C-capped) showed the highest level of digestion. On the other hand, Polythroid with N-terminal attachment (N-capped) showed no digestion in the gastric simulator and a relatively low amount of digestion in the intestinal simulator. Polythroid with random attachment showed only marginal digestion in the gastric simulator and moderate digestion in the intestinal simulator. In conclusion, the rate of thyroid hormone release from Polythroid varies depending on the method of synthesis. This provides a potential means of controlling (fine tuning) time release of oral delivery.
Conclusions and Summary
The following conclusions can be drawn from in vitro performance assays:
• T4 and T3 are released from Polythroid by pancreatic and intestinal cell proteases
• T4 and T3 released from Polythroid are absorbed across intestinal monolayers
• Polythroid enhances absorption of T4 across intestinal epithelium in vitro
• Polythroid itself does not cross the intestinal epithelial barrier in vitro
• The kinetics of time release may be controlled by the method of Polythroid
synthesis
Covalent attachment of T4 and T3 to a polypeptide affords a number of potential advantages to oral delivery for thyroid hormone replacement therapy. Proteolytic enzymes produced by the pancreas and intestinal epithelial cells release T4 and T3 from Polythroid. Therefore, T4 and T3 should be released in a time dependent manner as they descend the intestinal tract. Once released the hormones are absorbed across the intestinal epithelium in the Caco-2 cell model. In addition, data from the in vitro intestinal epithelial model suggests that attachment of T4 to polymers of glutamic acid may enhance absorption of the thyroid hormones, perhaps by providing a second mechanism of uptake and/or enhancing solubility of the hormones. Polythroid itself does not cross the intestinal epithelial barrier in the in vitro Caco-2 model. Thus, any concerns about systemic effects of the polymer are minimized since it should not be absorbed into the bloodstream.
Although illustrated and described above with reference to specific embodiments, the invention is nevertheless not intended to be limited to the details shown. Rather, various modifications may be made in the details within the scope
and range of equivalents of the claims and without departing from the spirit of the invention.
Claims (40)
1. A composition comprising: a polypeptide; and an active agent covalently attached to said polypeptide.
2. The composition of claim 1 wherein said active agent is selected from the group consisting of the compounds listed in TABLE 1.
3. The composition of claim 1 wherein said polypeptide is a homopolymer of a naturally occurring amino acid.
4. The composition of claim 1 wherein said polypeptide is a heteropolymer of two or more naturally occuning amino acids.
5. The composition of claim 1 wherein said polypeptide is a homopolymer of a synthetic amino acid.
6. The composition of claim 1 wherein said polypeptide is a heteropolymer of two or more synthetic amino acids.
7. The composition of claim 1 wherein said polypeptide is a heteropolymer of one or more naturally occuning amino acids and one or more synthetic amino acids.
8. The composition of claim 1 wherein said active agent is covalently attached to a side chain, the N-terminus or the C-terminus of said polypeptide.
9. The composition of claim 1 wherein said active agent is a carboxylic acid and wherein said active agent is covalently attached to the N-terminus of said polypeptide.
10. The composition of claim 1 wherein said active agent is an amine and wherein said active agent is covalently attached to the C-terminus of said polypeptide.
11. The composition of claim 1 wherein said active agent is an alcohol and wherein said active agent is covalently attached to the C-terminus of said polypeptide.
12. The composition of claim 1 wherein said active agent is an alcohol and wherein said active agent is covalently attached to the N-terminus of said polypeptide.
13. The composition of claim 1 further comprising a microencapsulating agent.
14. The composition of claim 13 wherein said microencapsulating agent is selected from the group consisting of polyethylene glycol (PEG), an amino acid, a sugar and a salt.
15. The composition of claim 1 further comprising an adjuvant.
16. The composition of claim 15 wherein said adjuvant activates an intestinal transporter.
17. The composition of claim 1 further comprising a pharmaceutically acceptable excipient.
18. The composition of claim 1 wherein said active agent is a nutrient and said composition is a nutraceutical composition.
19. The composition of claim 1 wherein said active agent is a pharmaceutical agent and said composition is a pharmaceutical composition.
20. The composition of claim 1 wherein said composition is in the form of an ingestable tablet.
21. The composition of claim 1 wherein said composition is in the form of an intravenous preparation.
22. The composition of claim 1 wherein said composition is in the form of an oral suspension.
23. The composition of claim 1 wherein said active agent is conformationally protected by folding of said polypeptide about said active agent.
24. The composition of claim 1 wherein said polypeptide is capable of releasing said active agent from said composition in a pH-dependent manner.
25. A method for protecting an active agent from degradation comprising covalently attaching said active agent to a polypeptide.
26. A method for controlling release of an active agent from a composition wherein said composition comprises a polypeptide, said method comprising covalently attaching said active agent to said polypeptide.
27. A method for delivering an active agent to a patient comprising administering to said patient a composition comprising: a polypeptide; and an active agent covalently attached to said polypeptide.
28. The method of claim 27 wherein said active agent is released from said composition by an enzyme-catalyzed release.
29. The method of claim 28 wherein said active agent is released in a time- dependent manner based on the pharmacokinetics of said enzyme-catalyzed release.
30. The method of claim 27 wherein said composition further comprises a microencapsulating agent and wherein said active agent is released from said composition by dissolution of said microencapsulating agent.
31. The method of claim 27 wherein said active agent is released from said composition by a pH-dependent unfolding of said polypeptide.
32. The method of claim 27 wherein said active agent is released from said composition in a sustained release.
33. The method of claim 27 wherein said composition further comprises an adjuvant covalently attached to said polypeptide and wherein release of said adjuvant from said composition is controlled by said polypeptide.
34. A method for preparing a composition comprising a polypeptide and an active agent covalently attached to said polypeptide, said method comprising the steps of:
(a) attaching the active agent to a side chain of an amino acid to form an active agent amino acid complex; (b) forming an active agent amino acid complex N-carboxyanhydride (NCA) from said active agent/amino acid complex; and
(c) polymerizing said active agent amino acid complex N-carboxyanhydride (NCA).
35. The method of claim 34 wherein the active agent is a pharmaceutical agent or an adjuvant.
36. The method of claim 34 wherein steps (a) and (b) are repeated prior to step (c) with a second active agent.
37. The method of claim 35 wherein said active agent and said second active agent are copolymerized in step (c).
38. The method of claim 34 wherein said amino acid is glutamic acid and wherein said active agent is released from said glutamic acid as a dimer upon a hydrolysis of the polypeptide and wherein said active agent is released from said glutamic acid by coincident intramolecular transamination.
39. The method of claim 38 wherein said glutamic acid is replaced by an amino acid selected from the group consisting of aspartic acid, arginine, asparagine, cysteine, lysine, threonine, and serine, and wherein said active agent is attached to the side chain of the amino acid to form an amide, a thioester, an ester, an ether, a urethane, a carbonate, an anhydride or a carbamate.
40. The method of claim 38 wherein said glutamic acid is replaced by a synthetic amino acid with a pendant group comprising an amine, an alcohol, a sulfhydryl, an amide, a urea, or an acid functionality.
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2000
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2001
- 2001-08-22 WO PCT/US2001/026142 patent/WO2002034237A1/en active IP Right Grant
- 2001-08-22 CA CA002420590A patent/CA2420590A1/en not_active Abandoned
- 2001-08-22 IL IL15458301A patent/IL154583A0/en active IP Right Grant
- 2001-08-22 EP EP01966056A patent/EP1311242B1/en not_active Expired - Lifetime
- 2001-08-22 AU AU2001286599A patent/AU2001286599B2/en not_active Expired
- 2001-08-22 AU AU8659901A patent/AU8659901A/en active Pending
-
2003
- 2003-12-05 US US10/727,565 patent/US20040127397A1/en not_active Abandoned
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2004
- 2004-08-23 US US10/923,088 patent/US7427600B2/en not_active Expired - Lifetime
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