WO2002069930A1 - Compositions and methods for enhancing drug delivery across and into epithelial tissues - Google Patents
Compositions and methods for enhancing drug delivery across and into epithelial tissues Download PDFInfo
- Publication number
- WO2002069930A1 WO2002069930A1 PCT/US2002/005829 US0205829W WO02069930A1 WO 2002069930 A1 WO2002069930 A1 WO 2002069930A1 US 0205829 W US0205829 W US 0205829W WO 02069930 A1 WO02069930 A1 WO 02069930A1
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- WO
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- Prior art keywords
- delivery
- conjugate
- enhancing
- arginine
- cells
- Prior art date
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Definitions
- This invention pertains to the field of compositions and methods that enhance the delivery of drugs and other compounds across the dermal and epithelial membranes, including, for example, skin, the gastrointestinal epithelium and the bronchial epithelium.
- Transdermal or transmucosal drug delivery is an attractive route of drug delivery for several reasons. Gastrointestinal drug degradation and the hepatic first-pass effect are avoided. In addition, transdermal and transmucosal drug delivery is well-suited to controlled, sustained delivery (see, e.g., Elias, In Percutaneous Absorption: Mechanisms- Methodology-Drug Delivery, Bronaugh & Maibach, Eds., pp 1-12, Marcel Dekker, New York, 1989.). For many applications, traditional methods of administering drugs are not optimal because of the very large initial concentration of the drug. Transdermal delivery could allow a more uniform, slower rate of delivery of a drug. Moreover, patient compliance is encouraged because such delivery methods are easy to use, comfortable, convenient and non-invasive.
- Skin is a structurally complex thick membrane that represents the body's border to the external hostile environment.
- the skin is composed of the epidermis, the dermis, the hypodermis, and the adenexal structures (epidermal appendages).
- the epidermis, the outermost epithelial tissue of the skin is itself composed of several layers—the stratum corneum, the stratum granulosum, the stratum spinosum, and the stratum basale.
- stratum corneum the outermost layer of skin, which is compact and highly keratinized.
- stratum corneum is composed of several layers of keratin-filled skin cells that are tightly bound together by a "glue" composed of cholesterol and fatty acids.
- the thickness of the stratum corneum varies depending upon body location. It is the presence of stratum corneum that results in the impermeability of the skin to pharmaceutical agents.
- stratum corneum is formed naturally by cells migrating from the basal layer toward the skin surface where they are eventually sloughed off. As the cells progress toward the surface, they become progressively more dehydrated and keratinized.
- the penetration across the stratum corneum layer is generally the rate-limiting step of drug permeation across skin. See, e.g., Flynn, G.L., In Percutaneous Absorption: Mechanisms-Methodology-Drug Delivery, supra, at pages 27-53.
- the epidermis which lies under the stratum corneum, is composed of three layers. The outermost of these layers is the stratum granulosum, which lies adjacent to the stratum corneum, is composed of cells that are differentiated from basal cells and keratinocytes, which make up the underlying layers, having acquired additional keratin and a more flattened shape. The cells of this layer of the epidermis, which contain granules that are composed largely of the protein filaggrin.
- This protein is believed to bind to the keratin filaments to form the keratin complex.
- the cells also synthesize lipids that function as a "cement" to hold the cells together.
- the epidermis, in particular the stratum granulosum, contains enzymes such as aminopeptidases.
- the next-outermost layer of the epidermis is the stratum spinosum, the principal cells of which are keratinocytes, which are derived from basal cells that comprise the basal cell layer. Langerhans cells, which are also found in the stratum spinosum, are antigen-presenting cells and thus are involved in the mounting of an immune response against antigens that pass into the skin. The cells of this layer are generally involved in contact sensitivity dermatitis.
- the innermost epidermal layer is the stratum basale, or basal cell layer, which consists of one cell layer of cuboidal cells that are attached by hemi-desmosomes to a thin basement membrane which separates the basal cell layer from the underlying dermis.
- the cells of the basal layer are relatively undifferentiated, proliferating cells that serve as a progenitor of the outer layers of the epidermis.
- the basal cell layer includes, in addition to the basal cells, melanocytes.
- the dermis is found under the epidermis, which is separated from the dermis by a basement membrane that consists of interlocking rete ridges and dermal papillae.
- the dermis itself is composed of two layers, the papillary dermis and the reticular dermis.
- the dermis consists of fibroblasts, histiocytes, endothelial cells, perivascular macrophages and dendritic cells, mast cells, smooth muscle cells, and cells of peripheral nerves and their end- organ receptors.
- the dermis also includes fibrous materials such as collagen and reticulin, as well as a ground substance (principally glycosaminoglycans, including hyaluronic acid, chondroitin sulfate, and dermatan sulfate).
- the brain capillaries that make up the blood-brain barrier are composed of endothelial cells that form tight junctions between themselves (Goldstein et al., Scientific American 255:74-83 (1986); Pardridge, W. M., Endocrin. Rev. 7: 314-330 (1986)).
- the endothelial cells and the tight intercellular junctions that join the cells form a barrier against the passive movement of many molecules from the blood to the brain.
- the endothelial cells of the blood-brain barrier have few pinocytotic vesicles, which in other tissues can allow somewhat unselective transport across the capillary wall.
- the blood-brain barrier interrupted by continuous gaps or channels that run through the cells, thus allowing for unrestrained passage of drugs and other molecules.
- the present invention provides methods of targeting a compound to a gastrointestinal epithelium of an animal.
- the methods involve administering to the gastrointestinal epithelium a conjugate that includes the compound and a delivery-enhancing transporter.
- the delivery-enhancing transporters which are also provided by the invention, have sufficient guanidino or amidino moieties to increase delivery of the conjugate into the gastrointestinal epithelium compared to delivery of the compound in the absence of the delivery-enhancing transporter.
- delivery of the conjugate into the gastrointestinal epithelium is increased at least two-fold compared to delivery of the compound in the absence of the delivery-enhancing transporter.
- delivery of the conjugate into the gastrointestinal epithelium is increased at least ten- fold compared to delivery of the compound in the absence of the delivery- enhancing transporter.
- the delivery-enhancing transporter and the compound are typically attached through a linker.
- the conjugate can comprise two or more delivery- enhancing transporters linked to the compound.
- the delivery-enhancing transporters comprise fewer than 50 subunits and comprise at least 6 guanidino or amidino moieties.
- the subunits are amino acids.
- the delivery-enhancing transporters have from 6 to 25 guanidino or amidino moieties, and more preferably between 7 and 15 guanidino moieties and still more preferably, at least six contiguous guanidino and/or amidino moieties.
- the delivery-enhancing transporters consist essentially of 5 to 50 subunits, at least 50 of which comprise guanidino or amidino residues.
- the subunits are natural or non-natural amino acids.
- the delivery-enhancing transporter comprises 5 to 25 arginine residues or analogs thereof.
- the transporter can comprise seven contiguous D-arginines.
- the delivery-enhancing transporter comprises 7-15 arginine residues or analogs of arginine.
- the delivery-enhancing transporter can have at least one arginine that is a D-arginine and in some embodiments, all arginines are D-arginine. In some embodiments, at least 70% of the amino acids are arginines or arginine analogs. In some embodiments, the delivery-enhancing transporter comprises at least 5 contiguous arginines or arginine analogs.
- the delivery-enhancing transporters can comprise non- peptide backbones. In addition, in some aspects, the transporter is not attached to an amino acid sequence to which the delivery-enhancing molecule is attached in a naturally occurring protein.
- the delivery-enhancing transporters and methods of the invention are useful for delivering drugs, diagnostic agents, and other compounds of interest to the gastrointestinal epithelium.
- the methods and compositions of the invention can be used not only to deliver the compounds to the particular site of administration, but also provide systemic delivery.
- the conjugate is administered bucally or as a suppository.
- the compounds of the conjugate can be a therapeutic for a disease such as inflammatory bowel disease, colon cancer, ulcerative colitis, gastrointestinal ulcers, constipation and imbalance of salt and water absorption.
- the compounds can include immunosuppressives, corticosteroids, laxatives, antibiotics or anti-neoplastic agents.
- the compound is targeted to the iliem and/or colon.
- the compound to be delivered can be connected to the delivery-enhancing transporter by a linker.
- the linker is a releasable linker which releases the compound, in biologically active form, from the delivery- enhancing transporter after the compound has passed into and/or through one or more layers of the epithelial and/or endothelial tissue.
- the compound is released from the linker by solvent-mediated cleavage.
- the conjugate is, in some embodiments, substantially stable at acidic pH but the compound is substantially released from the delivery-enhancing transporter at physiological pH.
- the half-life of the conjugate is between 5 minutes and 24 hours upon contact with the skin or other epithelial or endothelial tissue.
- the half-life can be between 30 minutes and 2 hours upon contact with the skin or other epithelial or endothelial tissue.
- conjugate structures of the invention include those having structures such as 3, 4, or 5, as follows: 7 H
- R 1 comprises the compound;
- X is a linkage formed between a functional group on the biologically active compound and a terminal functional group on the linking moiety;
- Y is a linkage formed from a functional group on the transport moiety and a functional group on the linking moiety;
- A is N or CH;
- R 2 is hydrogen, alkyl, aryl, acyl, or allyl;
- R 3 comprises the delivery-enhancing transporter;
- R 4 is S, O, NR 6 or CR 7 R 8 ;
- R 5 is H, OH, SH or NHR 6 ;
- R 6 is hydrogen, alkyl, aryl, acyl or allyl;
- k and m are each independently selected from 1 and 2; and
- n is 1 to 10.
- X is selected from the group consisting of -C(O)O-, -C(O)NH-, -OC(O)NH-, -S-S-, -C(S)O-, -C(S)NH-, -NHC(O)NH-, -SO 2 NH-, -SONH-, phosphate, phosphonate phosphinate, and CR 7 R 8 , wherein R 7 and R 8 are each independently selected from the group consisting of H and alkyl.
- R 4 is S
- R 5 is NHR O
- R_ is hydrogen, methyl, allyl, butyl or phenyl.
- R 2 is benzyl; k, m, and n are each 1, and X is O.
- the conjugate comprises structure 3, Y is N, and R is methyl, ethyl, propyl, butyl, allyl, benzyl or phenyl.
- R is benzyl; k, m, and n are each 1, and X is -OC(O)-.
- the conjugate comprises structure 4; R 4 is S; R 5 is NHR 6 ; and R 6 is hydrogen, methyl, allyl, butyl or phenyl.
- the conjugate comprises structure 4; R 5 is NHR 6 ; R 6 is hydrogen, methyl, allyl, butyl or phenyl; and k and m are each 1.
- the invention also provides conjugates in which the release of the linker from the biological agent involves a first, rate-limiting intramolecular reaction, followed by a faster intramolecular reaction that results in release of the linker.
- the rate-limiting reaction can, by appropriate choice of substituents of the linker, be made to be stable at a pH that is higher or lower than physiological pH.
- the linker will be cleaved from the agent.
- An example of a compound that has this type of linker is structure 6, as follows:
- R 1 comprises the compound
- X is a linkage formed between a functional group on the biologically active compound and a terminal functional group on the linking moiety
- Y is a linkage formed from a functional group on the transport moiety and a functional group on the linking moiety
- Ar is an aryl group having the attached radicals arranged in an ortho or para configuration, which aryl group can be substituted or unsubstituted
- R 3 comprises the delivery-enhancing transporter
- R 4 is S, O, NR 6 or CR 7 R 8
- R 5 is H, OH, SH or NHRe
- R 6 is hydrogen, alkyl, aryl, arylalkyl, acyl or allyl
- R 7 and R 8 are independently selected from hydrogen or alkyl
- k and m are each independently selected from 1 and 2.
- X is selected from the group consisting of -C(O)O-, -C(O)NH-, -OC(O)NH-, -S-S-, -C(S)O-, -C(S)NH-, -NHC(O)NH-, -SO 2 NH-, -SONH-, phosphate, phosphonate phosphinate, and CR 7 R 8 , wherein R 7 and R 8 are each independently selected from the group consisting of H and alkyl.
- R 4 is S;
- R 5 is NHR 6 ; and
- R 6 is hydrogen, methyl, allyl, butyl or phenyl.
- compositions of the invention comprise a linker susceptible to solvent-mediated cleavage.
- a preferred linker is substantially stable at acidic pH but is substantially cleaved at physiological pH.
- Figure 1 shows a reaction scheme for the preparation of an ⁇ -chloroacetyl cyclosporin A derivative.
- Figure 2 shows a general procedure for the coupling of cysteine-containing peptides to the -chloro acetyl cyclosporin A derivative.
- Figure 3 shows a reaction scheme for the coupling of the cyclosporin A derivative to a biotin-labeled peptide.
- Figure 4 shows a reaction scheme for coupling of a cyclosporin A derivative to an unlabeled peptide.
- Figure 5 A-H show various types of cleavable linkers that can be used to link a delivery-enhancing transporter to a biologically active agent or other molecule of interest.
- Figure 5 A shows an example of a disulfide linkage.
- Figure 5B shows a photocleavable linker which is cleaved upon exposure to electromagnetic radiation.
- Figure 5C shows a modified lysyl residue used as a cleavable linker.
- Figure 5D shows a conjugate in which the delivery- enhancing transporter T is linked to the 2'-oxygen of the anticancer agent, paclitaxel.
- the linking moiety includes (i) a nitrogen atom attached to the delivery-enhancing transporter, (ii) a phosphate monoester located para to the nitrogen atom, and (iii) a carboxymethyl group meta to the nitrogen atom, which is joined to the 2'-oxygen of paclitaxel by a carboxylate ester linkage.
- Figure 5E a linkage of a delivery-enhancing transporter to a biologically active agent, e.g., paclitaxel, by an aminoalkyl carboxylic acid; a linker amino group is joined to a delivery-enhancing transporter by an amide linkage and to a paclitaxel moiety by an ester linkage.
- Figure 5G shows the general chemical structure and ring atom numbering for taxoid compounds.
- Figure 6 displays a synthetic scheme for a chemical conjugate between a hep tamer of L-arginine and cyclosporin A (panel A) and its pH dependent chemical release (panel B).
- the ⁇ -chloro ester (6i) was treated with benzylamine in the presence of sodium iodide to effect substitution, giving the secondary amine (6ii).
- Figure 7 displays inhibition of inflammation in murine contact dermatitis by releasable R7 CsA.
- Balb/c (6-7 weeks) mice were painted on the abdomen with 100 ⁇ l of 0.7% DNFB in acetone olive oil (95:5). Three days later both ears of the animals were restimulated with 0.5% DNFB in acetone. Mice were treated one, five, and twenty hours after restimulation with either vehicle alone, 1% R7 peptide alone, 1% CsA, 1% nonreleasable R7 CsA, 0.01%/0.1% /1.0% releasable R7 CsA, and the fluorinated steroid positive control 0.1% triamcinolone acetonide.
- Figure 8 shows a procedure for the preparation of a copper-diethylene- triaminepentaacetic acid complex (Cu-DTPA).
- Figure 9 shows a procedure for linking the Cu-DTPA to a transporter through an aminocaproic acid.
- Figure 10 shows a reaction for the acylation of hydrocortisone with chloroacetic anhydride.
- Figure 11 shows a reaction for linking the acylated hydrocortisone to a transporter.
- Figure 12 shows a reaction for preparation of C-2' derivatives of taxol.
- Figure 13 shows a schematic of a reaction for coupling of a taxol derivative to a biotin-labeled peptide.
- Figure 14 shows a reaction for coupling of an unlabeled peptide to a C-2' derivative of taxol.
- Figure 15A-C shows a reaction scheme for the formation of other C-2' taxol- peptide conjugates.
- Figure 16 shows a general strategy for synthesis of a conjugate in which a drug or other biological agent is linked to a delivery-enhancing transporter by a pH- releasable linker.
- Figure 17 shows a schematic diagram of a protocol for synthesizing a taxol 2'-chloroacetyl derivative.
- Figure 18 shows a strategy by which a taxol 2'-chloroacetyl derivative is linked to an arginine heptamer delivery-enhancing transporter.
- Figure 19 shows three additional taxol-r7 conjugates that can be made using the reaction conditions illustrated in Figure 18.
- Figure 20 shows the results of a 3 day MTT cytotoxicity assay using taxol and two different linkers.
- Figure 21 shows the FACS cellular uptake assay of truncated analogs of Tat 49-57 (Fl-ahx-RKKRRQRRR): Tat 49-56 (Fl-ahx-RKKRRQRR), Tat 49-55 (Fl-ahx-
- Figure 22 shows FACS cellular uptake assay of alanine-substituted analogs of Tat 49-57 : A-49 (Fl-ahx-AKKRRQRRR), A-50 (Fl-ahx-RAKRRQRRR), A-51 (Fl-ahx-
- Tat 49 . 57 ⁇ 4-Tat49-57 (Fl-ahx-rkkrrqrrr), Tat57-49 (Fl-ahx-RRRQRRKKR), and -Tat57-49 (Fl-ahx-rrrqrrkkr).
- Jurkat cells were incubated with varying concentrations (12.5 ⁇ M shown) of peptides for 15 min at 23 °C.
- Figure 24 shows the FACS cellular uptake of a series of arginine oligomers and Tat 49-57 : R5 (Fl-ahx-RRRRR), R6 (Fl-ahx-RRRRRR), R7 (Fl-ahx-RRRRRRR), R8 (Fl- ahx-RRRRRRRR), R9 (Fl-ahx-RRRRRRRRR), r5 (Fl-ahx-rrrrr), r6 (Fl-ahx-rrrrrrr), r7 (Fl- ahx-rrrrrrrr), r8 (Fl-ahx-rrrrrrrrr), r9 (Fl-ahx-rrrrrrrrrrr).
- Jurkat cells were incubated with varying concentrations (12.5 ⁇ M shown) of peptides for 4 min at 23 °C.
- Figure 25 displayes the preparation of guanidine-substituted peptoids.
- Figure 26 displays the FACS cellular uptake of polyguanidine peptoids and d- arginine oligomers.
- Jurkat cells were incubated with varying concentrations (12.5 ⁇ M shown) of peptoids and peptides for 4 min at 23 °C.
- Figure 27 displays the FACS cellular uptake of ⁇ i-arginine oligomers and polyguanidine peptoids.
- Jurkat cells were incubated with varying concentrations (12.5 ⁇ M shown) of fluorescently labeled peptoids and peptides for 4 min at 23 °C.
- Figure 28 displays the FACS cellular uptake of and i-arginine oligomers and N-hxg peptoids.
- Jurkat cells were incubated with varying concentrations (6.3 ⁇ M shown) of fluorescently labeled peptoids and peptides for 4 min at 23 °C.
- Figure 29 shows the FACS cellular uptake of d-arginine oligomers and N-chg peptoids.
- Jurkat cells were incubated with varying concentrations (12.5 ⁇ M shown) of fluorescently labeled peptoids and peptides for 4 min at 23 °C.
- Figure 30 shows a general strategy for attaching a delivery-enhancing transporter to a drug that includes a triazole ring structure.
- Figure 31 A and Figure 3 IB show synthetic schemes for making conjugates in which FK506 is attached to a delivery-enhancing transporter.
- Figure 32 show that short oligomers of arginine, but not lysine, effectively enter Caco-2 cells.
- Caco-2 cells were incubated with varying concentrations with each of the peptides shown, washed, and analyzed by flow cytometry. Uptake could be inhibited with preincubation with sodium azide, demonstrating that it was energy dependent.
- Figure 33 displays the measured fluorescence of Caco-2 cells exposed to fluorescent taxol or fluorescent, nonreleasable taxol conjugates with either heptamers (r7) or decamers (rlO) of D-arginine.
- Figure 34 demonstrates Caco-2 monolayer integrity by the measurement of a stable transepithlial electric resistance of greater than 100 ohm cm for the duration of the experiments described in this report.
- Figure 35 shows the accumulation of either Fl aca r5, Fl aca r9, Lucifer Yellow, or hydrocortisone in the basolateral chamber of a diffusion apparatus after transport through a Caco-2 cell monolayer after one hour.
- Figure 36 displays the blood levels of CsA in rats measured by LC MS MS at thirty minute intervals after intracolonic injection.
- CsA was administered in Cremophor El: ethanol, 1 :1, whereas the CsA conjugates were administered in PBS.
- the half life in PBS, pH 7.4 at 37°C, of the CsA conjugate (CGC1072) was 1.5 hours.
- Figure 37 displays the blood levels of taxol in rats measured by LC MS MS at thirty minute intervals after intracolonic injection. Taxol was administered in Cremophor EL:ethanol, 1:1, whereas the two taxol conjugates were administered in PBS. The half life in PBS, pH 7.4 at 37°C, of the slower releasing conjugate (14) was 5 hours, while that of the faster conjugate (13) was ten minutes. See, Example 18.
- Figure 38 displays the blood levels of taxol in rats measured by LC MS MS at thirty minute intervals after buccal delivery. Taxol was administered in Cremophor El: ethanol, 1:1, whereas the taxol conjugate was administered in PBS. The half life in PBS, pH 7.4 at 37°C, of the conjugate (13) was ten minutes.
- Figure 39 illustrates the conjugation of acyclovir to r7-amide via an N- terminal cysteine group. Conjugation with a biotin-containing transporter is also shown.
- Figure 40 illustrates the conjugate formed between a retinal and a r9 (shown without spacing amino acids).
- Figure 41 illustrates the use of a cleavable linker in preparing a retinoic acid- r9 conjugate.
- Figure 42 illustrates a method of linking active agents such as acyclovir to transport moieties.
- Figure 43 illustrates a method of linking active agents such as acyclovir to transport moieties.
- Figure 44 illustrates a method of linking active agents such as a corticoid steroid to transport moieties.
- Epithelial tissue is the basic tissue that covers surface areas of the surface, spaces, and cavities of the body. Epithelial tissues are composed primarily of epithelial cells that are attached to one another and rest on an extracellular matrix (basement membrane) that is typically produced by the cells. Epithelial tissues include three general types based on cell shape: squamous, cuboidal, and columnar epithelium. Squamous epithelium, which lines lungs and blood vessels, is made up of flat cells. Cuboidal epithelium lines kidney tubules and is composed of cube shaped cells, while columnar epithelium cells line the digestive tract and have a columnar appearance. Epithelial tissues can also be classified based on the number of cell layers in the tissue.
- a simple epithelial tissue is composed of a single layer of cells, each of which sits on the basement membrane.
- a "stratified” epithelial tissue is composed of several cells stacked upon one another; not all cells contact the basement membrane.
- a “pseudostratified” epithelial tissue has cells that, although all contact the basement membrane, appear to be stratified because the nuclei are at various levels.
- trans-epithelial delivery or administration refers to the delivery or administration of agents by permeation through one or more layers of a body surface or tissue, such as intact skin or a mucous membrane, by topical administration.
- the term is intended to include both transdermal (e.g., percutaneous adsorption) and transmucosal administration. Delivery can be to a deeper layer of the tissue, for example, and/or delivery to the bloodstream.
- Delivery enhancement relates to an increase in amount and/or rate of delivery of a compound that is delivered into and across one or more layers of an epithelial or endothelial tissue.
- An enhancement of delivery can be observed by measuring the rate and/or amount of the compound that passes through one or more layers of animal or human skin or other tissue.
- Delivery enhancement also can involve an increase in the depth into the tissue to which the compound is delivered, and/or the extent of delivery to one or more cell types of the epithelial or other tissue (e.g., increased delivery to fibroblasts, immune cells, and endothelial cells of the skin or other tissue). Such measurements are readily obtained by, for example, using a diffusion cell apparatus as described in US Patent No. 5,891,462.
- the amount or rate of delivery of an agent across and/or into skin or other epithelial or endothelial membrane is sometimes quantitated in terms of the amount of compound passing through a predetermined area of skin or other tissue, which is a defined area of intact unbroken living skin or mucosal tissue. That area will usually be in the range of about 5 cm to about 100 cm , more usually in the range of about 10 cm to about 100
- guanidyl guanidinyl
- arginine contains a guanidyl (guanidino) moiety, and is also referred to as 2-amino- 5 -guanidino valeric acid or ⁇ -amino- ⁇ -guanidinovaleric acid.
- “Guanidium” refers to the positively charged conjugate acid form.
- guanidino moiety includes, for example, guanidine, guanidinium, guanidine derivatives such as (RNHC(NH)NHR'), monosubstituted guanidines, monoguanides, biguanides, biguanide derivatives such as (RNHC(NH)NHC(NH)NHR'), and the like.
- guanidino moiety encompasses any one or more of a guanide alone or a combination of different guanides.
- Amidinium refers to the positively charged conjugate acid form.
- trans-barrier concentration or "trans-tissue concentration” refers to the concentration of a compound present on the side of one or more layers of an epithelial or endothelial barrier tissue that is opposite or “trans” to the side of the tissue to which a particular composition has been added. For example, when a compound is applied to the skin, the amount of the compound measured subsequently across one or more layers of the skin is the trans-barrier concentration of the compound.
- Biologically active agent or “biologically active substance” refers to a chemical substance, such as a small molecule, macromolecule, or metal ion, that causes an observable change in the structure, function, or composition of a cell upon uptake by the cell.
- Observable changes include increased or decreased expression of one or more mRNAs, increased or decreased expression of one or more proteins, phosphorylation of a protein or other cell component, inhibition or activation of an enzyme, inhibition or activation of binding between members of a binding pair, an increased or decreased rate of synthesis of a metabolite, increased or decreased cell proliferation, and the like.
- therapeutic agent refers, without limitation, to any composition that can be used to the benefit of a mammalian species. Such agents may take the form of ions, small organic molecules, peptides, proteins or polypeptides, oligonucleotides, and oligosaccharides, for example.
- macromolecule refers to large molecules (MW greater than 1000 daltons) exemplified by, but not limited to, peptides, proteins, oligonucleotides and polynucleotides of biological or synthetic origin.
- Small organic molecule refers to a carbon-containing agent having a molecular weight (MW) of less than or equal to 1000 daltons.
- non-polypeptide agent and “non-polypeptide therapeutic agent” refer to the portion of a conjugate that does not include the delivery-enhancing transporter, and that is a biologically active agent other than a polypeptide.
- An example of a non- polypeptide agent is an anti-sense oligonucleotide, which can be conjugated to a poly- arginine peptide to form a conjugate for enhanced delivery into and across one or more layers of an epithelial or endothelial tissue.
- a "subunit,” as used herein, is a monomeric unit that are joined to form a larger polymeric compound.
- the set of amino acids are an example of subunits. Each amino acid shares a common backbone (-C-C-N-), and the different amino acids differ in their sidechains. The backbone is repeated in a polypeptide.
- a subunit represents the shortest repeating pattern of elements in a polymer backbone. For example, two amino acids of a peptide are not considered a peptide because two amino acids would not have the shortest repeating pattern of elements in the polymer backbone.
- polymer refers to a linear chain of two or more identical or non- identical subunits joined by covalent bonds.
- a peptide is an example of a polymer; peptides can be composed of identical or non-identical amino acid subunits that are joined by peptide linkages (amide bonds).
- peptide refers to a compound made up of a single chain of D- or L- amino acids or a mixture of D- and L-amino acids joined by peptide bonds. Generally, peptides contain at least two amino acid residues and are less than about 50 amino acids in length. D-amino acids are represented herein by a lower-case one-letter amino acid symbol (e.g., r for D-arginine), whereas L-amino acids are represented by an upper case one-letter amino acid symbol (e.g., R for L-arginine).
- Homopolymer peptides are represented by a one-letter amino acid symbol followed by the number of consecutive occurrences of that amino acid in the peptide- (e.g., R7 represents a hep tamer that consists of L-arginine residues).
- the term "protein” as used herein refers to a compound that is composed of linearly arranged amino acids linked by peptide bonds, but in contrast to peptides, has a well-defined conformation. Proteins, as opposed to peptides, generally consist of chains of 50 or more amino acids.
- Polypeptide as used herein refers to a polymer of at least two amino acid residues and which contains one or more peptide bonds. "Polypeptide” encompasses peptides and proteins, regardless of whether the polypeptide has a well-defined conformation.
- the present invention provides compositions and methods that enhance the transfer of compounds, including drugs and other biologically active compounds, into and across one or more layers of an animal epithelial or endothelial tissue.
- the methods involve contacting the tissue with a conjugate that includes the compound of interest linked to a delivery-enhancing transporter.
- the delivery enhancing transporters provided by the invention are molecules that include sufficient guanidino or amidino moieties to increase delivery of the conjugate into and across one or more intact epithelial and endothelial tissue layers.
- the methods and compositions are useful for trans-epithelial and trans-endothelial delivery of drugs and other biologically active molecules, and also for delivery of imaging and diagnostic molecules.
- compositions of the invention are particularly useful for delivery of compounds that require trans-epithelial or trans-endothelial transport to exhibit their biological effects, and that by themselves (without conjugation to a delivery- enhancing transporters or some other modification), are unable, or only poorly able, to cross such tissues and thus exhibit biological activity.
- the delivery-enhancing transporters and methods of the invention provide significant advantages over previously available methods for obtaining trans-epithelial and trans-endothelial tissue delivery of compounds of interest.
- the transporters make possible the delivery of drugs and other agents across tissues that were previously impenetrable to the drug.
- the methods of the invention can deliver compounds not only into cells of a first layer of an epithelial tissue such as skin, but also across one or more layers of the skin.
- the blood brain barrier is also resistant to transport of drugs and other diagnostic and therapeutic reagents; the methods and transporters of the invention provide means to obtain such transport.
- the delivery-enhancing transporters increase delivery of the conjugate into and across one or more intact epithelial or endothelial tissue layers compared to delivery of the compound in the absence of the delivery-enhancing transporter.
- the delivery-enhancing transporters can, in some embodiments, increase delivery of the conjugate significantly over that obtained using the tat protein of HIV-1 (Frankel et al. (1991) PCT Pub. No. WO 91/09958). Delivery is also increased significantly over the use of shorter fragments of the tat protein containing the tat basic region (residues 49-57 having the sequence RKKRRQRRR) (Barsoum et al. (1994) WO 94/04686 and Fawell et al. (1994) Proc. Nat 7.
- delivery obtained using the transporters of the invention is increased more than 2-fold, still more preferably six-fold, still more preferably ten-fold, and still more preferably twenty-fold, over that obtained with tat residues 49-57.
- the compositions of the invention do not include tat residues 49-57.
- the delivery-enhancing transporters of the invention can provide increased delivery compared to a 16 amino acid peptide-cholesterol conjugate derived from the Antennapedia homeodomain that is rapidly internalized by cultured neurons (Brugidou et al. (1995) Biochem. Biophys. Res. Commun. 214: 685-93).
- the Herpes simplex protein VP22 like tat and the Antennapedia domain, was previously known to enhance transport into cells, but was not known to enhance transport into and across endothelial and epithelial membranes (Elliot and O'Hare (1997) Cell 88: 223-33; Dilber et al. (1999) Gene Ther. 6: 12-21; Phelan et al. (1998) Nature Biotechnol. 16: 440-3).
- the delivery-enhancing transporters provide significantly increased delivery compared to the Antennapedia homeodomain and to the VP22 protein.
- the compositions of the invention do not include the Antennapedia homeodomain, the VP22 protein or eight contiguous arginines.
- the delivery-enhancing transporters of the invention are molecules that have sufficient guanidino and/or amidino moieties to increase delivery of a compound to which the delivery-enhancing transporter is attached into and across one or more layers of an epithelial tissue (e.g., skin or mucous membrane) or an endothelial tissue (e.g., the blood- brain barrier).
- the delivery-enhancing transporters generally include a backbone structure to which is attached the guanidino and/or amidino sidechain moieties.
- the backbone is a polymer that consists of subunits (e.g., repeating monomer units), at least some of which subunits contain a guanidino or amidino moiety.
- the delivery-enhancing transporters typically display at least 5 guanidino and/or amidino moieties, and more preferably 7 or more such moieties.
- the delivery-enhancing transporters have 25 or fewer guanidino and/or amidino moieties, and often have 15 or fewer of such moieties.
- the delivery-enhancing transporter consists essentially of 50 or fewer subunits, and can consist essentially of 25 or fewer, 20 or fewer, or 15 or fewer subunits.
- the delivery-enhancing transporter can be as short as 5 subunits, in which case all subunits include a guanidino or amidino sidechain moiety.
- the delivery-enhancing transporters can have, for example, at least 6 subunits, and in some embodiments have at least 7 or 10 subunits. Generally, at least 50% of the subunits contain a guanidino or amidino sidechain moiety. More preferably, at least 70% of the subunits, and sometimes at least 90% of the subunits in the delivery-enhancing transporter contain a guanidino or amidino sidechain moiety. Some or all of the guanidino and/or amidino moieties in the delivery- enhancing transporters can be contiguous. For example, the delivery-enhancing transporters can include from 6 to 25 contiguous guanidino and/or amidino-containing subunits.
- each subunit that contains a guanidino moiety is contiguous, as exemplified by a polymer containing at least six contiguous arginine residues.
- the delivery-enhancing transporters are exemplified by peptides.
- Arginine residues or analogs of arginine can constitute the subunits that have a guanidino moiety.
- Such an arginine-containing peptide can be composed of either all D-, all L- or mixed D- and L-amino acids, and can include additional amino acids, amino acid analogs, or other molecules between the arginine residues.
- the delivery-enhancing transporter can also include a non-arginine residue to which a compound to be delivered is attached, either directly or through a linker.
- the use of at least one D-arginine in the delivery-enhancing transporters can enhance biological stability of the transporter during transit of the conjugate to its biological target.
- the delivery-enhancing transporters are at least about 50% D-arginine residues, and for even greater stability transporters in which all of the subunits are D-arginine residues are used. If the delivery enhancing transporter molecule is a peptide, the transporter is not attached to an amino acid sequence to which the amino acids that make up the delivery enhancing transporter molecule are attached in a naturally occurring protein.
- the delivery-enhancing transporter is linear.
- an agent to be delivered into and across one or more layers of an epithelial tissue is attached to a terminal end of the delivery-enhancing transporter.
- the agent is linked to a single transport polymer to form a conjugate.
- the conjugate can include more than one delivery-enhancing transporter linked to an agent, or multiple agents linked to a single delivery-enhancing transporter.
- each subunit contains a highly basic sidechain moiety which (i) has a pKa of greater than 11, more preferably 12.5 or greater, and (ii) contains, in its protonated state, at least two geminal amino groups (NH 2 ) which share a resonance-stabilized positive charge, which gives the moiety a bidentate character.
- the guanidino or amidino moieties extend away from the backbone by virtue of being linked to the backbone by a sidechain linker.
- the sidechain atoms are preferably provided as methylene carbon atoms, although one or more other atoms such as oxygen, sulfur or nitrogen can also be present.
- a linker that attaches a guanidino moiety to a backbone can be shown as:
- n is preferably at least 2, and is preferably between 2 and 7. In some embodiments, n is 3 (arginine for structure 1). In other embodiments, n is between 4 and 6; most preferably n is 5 or 6. Although the sidechain in the exemplified formulae is shown as being attached to a peptide backbone (i.e.
- a repeating amide to which the sidechain is attached to the carbon atom that is ⁇ to the carbonyl group, subunit 1) and a peptoid backbone i.e., a repeating amide to which the sidechain is attached to the nitrogen atom that is ⁇ to the carbonyl group, subunit 2
- other non-peptide backbones are also suitable, as discussed in more detail herein.
- similar sidechain linkers can be attached to nonpeptide backbones (e.g., peptoid backbones).
- the delivery-enhancing transporters are composed of linked subunits, at least some of which include a guanidino and/or amidino moiety. Examples of suitable subunits having guanidino and/or amidino moieties are described below.
- Amino acids In some embodiments, the delivery-enhancing transporters are composed of D or L amino acid residues. The amino acids can be naturally occurring or non- naturally occurring amino acids.
- Arginine ⁇ -amino- ⁇ -guanidinovaleric acid
- ⁇ -amino- ⁇ - amidino-hexanoic acid isosteric amidino analog
- the guanidinium group in arginine has a pKa of about 12.5.
- the transporters are comprised of at least six contiguous arginine residues.
- amino acids such as ⁇ -amino- ⁇ -guanidino-propionic acid, ⁇ -amino- ⁇ - guanidino-butyric acid, or ⁇ -amino- ⁇ -guanidino-caproic acid (containing 2, 3 or 5 sidechain linker atoms, respectively, between the backbone chain and the central guanidinium carbon) can also be used.
- D-amino acids can also be used in the delivery enhancing transporters.
- Compositions containing exclusively D-amino acids have the advantage of decreased enzymatic degradation. However, they can also remain largely intact within the target cell. Such stability is generally not problematic if the agent is biologically active when the polymer is still attached.
- a linker that is cleavable at the site of action e.g., by enzyme- or solvent-mediated cleavage within a cell
- the transport moieties are amino acid oligomers of the following formulae: (ZYZ) n Z, (ZY) nestZ, (ZYY) n Z and (ZYYY) n Z.
- ZYZ in the formulae is D or L-arginine.
- Y is an amino acid that does not contain a guanidyl or amidinyl moiety.
- the subscript "n” is an integer ranging from 2 to 25.
- the letter "Y" represents a natural or non-natural amino acid.
- the amino acid can be essentially any compound having (prior to incorporation into the transport moiety) an amino group (NH 2 or NH-alkyl) and a carboxylic acid group (CO 2 H) and not containing either a guanidyl or amidinyl moiety.
- Examples of such compounds include D and L-alanine, D and L-cysteine, D and L-aspartic acid, D and L- glutamic acid, D and L-phenylalanine, glycine, D and L-histidine, D and L-isoleucine, D and L-lysine, D and L-leucine, D and L-methionine, D and L-asparagine, D and L-proline, D and L-glutamine, D and L-serine, D and L-threonine, D and L-valine, D and L-tryptophan, D and L-hydroxyproline, D and L-tyrosine, sarcosine, ⁇ -alanine, ⁇ -amino butyric acid and ⁇ -amino caproic acid.
- each Y will be independent of any other Y present in the transport moiety, though in some embodiments, all Y groups can be the same.
- the transport moiety has the formula (ZYZ) n Z, wherein each "Y” is independently selected from glycine, ⁇ -alanine, ⁇ -amino butyric acid and ⁇ -amino caproic acid, "Z” is preferably L-arginine, and n is preferably an integer ranging from 2 to 5. More preferably, each "Y" is glycine or ⁇ -amino caproic acid and n is 3.
- the use of glycine is preferred for those compositions in which the transport moiety is fused or covalently attached directly to a polypeptide biological agent such that the entire composition can be prepared by recombinant methods.
- ⁇ -amino caproic acid is preferred.
- the transport moiety has the formula (ZY) n Z, wherein each "Y" is preferably selected from glycine, ⁇ -alanine, ⁇ -amino butyric acid and ⁇ -amino caproic acid, "Z" is preferably L-arginine, and n is preferably an integer ranging from 4 to 10.
- each "Y" is glycine or ⁇ -amino caproic acid and n is 6.
- glycine is preferred for those compositions in which the transport moiety is fused or covalently attached directly to a polypeptide biological agent such that the entire composition can be prepared by recombinant methods.
- ⁇ - amino caproic acid is preferred for solution or solid phase construction of the transport moiety.
- the transport moiety has the formula (ZYY) n Z, wherein each "Y” is preferably selected from glycine, ⁇ -alanine, ⁇ -amino butyric acid and ⁇ -amino caproic acid, "Z” is preferably L-arginine, and n is preferably an integer ranging from 4 to 10. More preferably, each "Y” is glycine or ⁇ -amino caproic acid and n is 6.
- the transport moiety has the formula (ZYYY) n Z, wherein each "Y” is preferably selected from glycine, ⁇ -alanine, ⁇ - amino butyric acid and ⁇ -amino caproic acid, "Z” is preferably L-arginine, and n is preferably an integer ranging from 4 to 10. More preferably, "Y" is glycine and n is 6. In other embodiments, each of the Y groups will be selected to enhance certain desired properties of the transport moeity.
- each Y can be selected from those naturally occuring amino acids that are typically grouped together as hydrophobic amino acids (e.g., phenylalanine, phenylglycine, valine, leucine, isoleucine).
- transport moieties having a more hydrophilic character can be prepared when some or all of the Y groups are hydrophilic amino acids (e.g., lysine, serine, threonine, glutamic acid, and the like).
- the transport moiety can be a polypeptide fragment within a larger polypeptide.
- the transport moiety can be of the formula (ZYY) n Z yet have additional amino acids which flank this moiety (e.g., X m (ZYY) n Z-X p wherein the subscripts m and p represent integers of zero to about 10 and each X is independently a natural or non-natural amino acid).
- Subunits other than amino acids can also be selected for use in forming transport polymers. Such subunits can include, but are not limited to, hydroxy amino acids, N-methyl-amino acids amino aldehydes, and the like, which result in polymers with reduced peptide bonds. Other subunit types can be used, depending on the nature of the selected backbone, as discussed in the next section.
- the guanidino and/or amidino moieties that are included in the delivery- enhancing transporters are generally attached to a linear backbone.
- the backbone can comprise a variety of atom types, including carbon, nitrogen, oxygen, sulfur and phosphorus, with the majority of the backbone chain atoms typically consisting of carbon.
- a plurality of sidechain moieties that include a terminal guanidino or amidino group are attached to the backbone. Although spacing between adjacent sidechain moieties is typically consistent, the delivery-enhancing transporters used in the invention can also include variable spacing between sidechain moieties along the backbone.
- peptoid backbone As mentioned above, in a peptoid backbone, the sidechain is attached to the backbone nitrogen atoms rather than the carbon atoms.
- a peptoid backbone is poly-(N-substituted)glycine (poly-NSG). Synthesis of peptoids is described in, for example, US Patent No. 5,877,278.
- transporters that have a peptoid backbone are considered "non-peptide" transporters, because the transporters are not composed of amino acids having naturally occurring sidechain locations.
- Non-peptide backbones, including peptoid backbones provide enhanced biological stability (for example, resistance to enzymatic degradation in vivo).
- Delivery-enhancing transporters are constructed by any method known in the art.
- Exemplary peptide polymers can be produced synthetically, preferably using a peptide synthesizer (e.g., an Applied Biosystems Model 433) or can be synthesized recombinantly by methods well known in the art.
- Recombinant synthesis is generally used when the delivery enhancing transporter is a peptide which is fused to a polypeptide or protein of interest.
- N-methyl and hydroxy-amino acids can be substituted for conventional amino acids in solid phase peptide synthesis.
- production of delivery-enhancing transporters with reduced peptide bonds requires synthesis of the dimer of amino acids containing the reduced peptide bond. Such dimers are incorporated into polymers using standard solid phase synthesis procedures.
- the delivery- enhancing transporters of the invention can be flanked by one or more non-guanidino/non-amidino subunits (such as glycine, alanine, and cysteine, for example), or a linker (such as an aminocaproic acid group), that do not significantly affect the rate of trans-tissue layer transport of the corresponding delivery-enhancing transporter- containing conjugates.
- any free amino terminal group can be capped with a blocking group, such as an acetyl or benzyl group, to prevent ubiquitination in vivo.
- one synthetic method involves the following steps: 1) a peptoid polyamine is treated with a base and pyrazole-1- carboxamidine to provide a mixture; 2) the mixture is heated and then allowed to cool; 3) the cooled mixture is acidified; and 4) the acidified mixture is purified.
- the base used in step 1 is a carbonate, such as sodium carbonate
- heating step 2 involves heating the mixture to approximately 50 °C for between about 24 hours and about 48 hours.
- the purification step preferably involves chromatography (e.g., reverse-phase HPLC).
- the agent to be transported can be linked to the delivery-enhancing transporter according to a number of embodiments.
- the agent is linked to a single delivery-enhancing transporter, either via linkage to a terminal end of the delivery-enhancing transporter or to an internal subunit within the reagent via a suitable linking group.
- the agent is attached to more than one delivery- enhancing transporter, in the same manner as above.
- This embodiment is somewhat less preferred, since it can lead to crosslinking of adjacent cells.
- the conjugate contains two agent moieties attached to each terminal end of the delivery-enhancing transporter.
- the agent has a molecular weight of less than 10 kDa.
- the agent is generally not attached to one any of the guanidino or amidino sidechains so that they are free to interact with the target membrane.
- the conjugates of the invention can be prepared by straightforward synthetic schemes. Furthermore, the conjugate products are usually substantially homogeneous in length and composition, so that they provide greater consistency and reproducibility in their effects than heterogeneous mixtures.
- the present invention includes conjugates that do not contain substantially hydrophobic moieties, such as lipid and fatty acid molecules.
- Delivery-enhancing transporters of the invention can be attached covalently to biologically active agents by chemical or recombinant methods.
- Biologically active agents such as small organic molecules and macromolecules can be linked to delivery-enhancing transporters of the invention via a number of methods known in the art (see, for example, Wong, S.S., Ed., Chemistry of Protein Conjugation and Cross-Linking, CRC Press, Inc., Boca Raton, FL (1991) , either directly (e.g., with a carbodumide) or via a linking moiety.
- carbamate, ester, thioether, disulfide, and hydrazone linkages are generally easy to form and suitable for most applications. Ester and disulfide linkages are preferred if the linkage is to be readily degraded in the cytosol, after transport of the substance across the cell membrane.
- Various functional groups can be used to attach the biologically active agent to the transport polymer.
- groups which are not known to be part of an active site of the biologically active agent are preferred, particularly if the polypeptide or any portion thereof is to remain attached to the substance after delivery.
- Polymers such as peptides produced as described in PCT application US98/10571 (Publication No. WO 9852614), are generally produced with an amino terminal protecting group, such as FMOC.
- FMOC amino terminal protecting group
- the FMOC may be cleaved from the N-terminus of the completed resin-bound polypeptide so that the agent can be linked to the free N-terminal amine.
- the agent to be attached is typically activated by methods well known in the art to produce an active ester or active carbonate moiety effective to form an amide or carbamate linkage, respectively, with the polymer amino group.
- other linking chemistries can also be used.
- guanidino and amidino moieties can be blocked using conventional protecting groups, such as carbobenzyloxy groups (CBZ), di-t-BOC, PMC, Pbf, N-NO 2 , and the like.
- Coupling reactions are performed by known coupling methods in any of an array of solvents, such as N,N-dimethyl formamide (DMF), N-methyl pyrrolidinone, dichloromethane, water, and the like.
- exemplary coupling reagents include, for example, O-benzotriazolyloxy tetramethyluronium hexafluorophosphate (HATU), dicyclohexyl carbodumide, bromo-tris(pyrrolidino) phosphonium bromide (PyBroP), etc.
- Other reagents can be included, such as N,N-dimethylamino pyridine (DMAP), 4-pyrrolidino pyridine, N-hydroxy succinimide, N-hydroxy benzotriazole, and the like.
- Delivery-enhancing transporters of the invention can be attached to biologically active polypeptide agents by recombinant means by constructing vectors for fusion proteins comprising the polypeptide of interest and the delivery-enhancing transporter, according to methods well known in the art. Generally, the delivery-enhancing transporter component will be attached at the C-terminus or N-terminus of the polypeptide of interest, optionally via a short peptide linker. 3. Releasable Linkers
- the biologically active agents are, in presently preferred embodiments, attached to the delivery-enhancing transporter using a linkage that is specifically cleavable or releasable.
- linkages is particularly important for biologically active agents that are inactive until the attached delivery-enhancing transporter is released.
- conjugates that consist of a drug molecule that is attached to a delivery-enhancing transporter can be referred to as prodrugs, in that the release of the delivery-enhancing transporter from the drug results in conversion of the drug from an inactive to an active form.
- cleaved or “cleavage” of a conjugate or linker refers to release of a biological agent from a transporter molecule, thereby releasing an active biological agent.
- Specifically cleavable” or “specifically releasable” refers to the linkage between the transporter and the agent being cleaved, rather than the transporter being degraded (e.g. , by proteolytic degradation).
- the linkage is a readily cleavable linkage, meaning that it is susceptible to cleavage under conditions found in vivo.
- the agent upon passing into and through one or more layers of an epithelial and/or endothelial tissue, the agent is released from the delivery-enhancing transporter.
- Readily cleavable linkages can be, for example, linkages that are cleaved by an enzyme having a specific activity (e.g., an esterase, protease, phosphatase, peptidase, and the like) or by hydrolysis.
- linkers containing carboxylic acid esters and disulfide bonds are sometimes preferred, where the former groups are hydrolyzed enzymatically or chemically, and the latter are severed by disulfide exchange, e.g., in the presence of glutathione.
- the linkage can be selected so it is cleavable by an enzymatic activity that is known to be present in one or more layers of an epithelial or endothelial tissue.
- the stratum granulosum of skin has a relatively high concentration of N-peptidase activity.
- a specifically cleavable linker can be engineered onto a transporter molecule.
- amino acids that constitute a protease recognition site can be used to link the transporter to the agent.
- chemical or other types of linkers that are cleavable by, for example, exposure to light or other stimulus can be used to link the transporter to the agent of interest.
- a conjugate in which an agent to be delivered and a delivery-enhancing transporter are linked by a specifically cleavable or specifically releasable linker will have a half-life.
- the term "half-life" in this context refers to the amount of time required after applying the conjugate to an epithelial or endothelial membrane for one half of the amount of conjugate to become dissociated to release the free agent.
- the half-life for some embodiments is typically between 5 minutes and 24 hours, and more preferably is between 30 minutes and 2 hours.
- the half-life of a conjugate can be "tuned" or modified, according to the invention, as described below.
- the cleavage rate of the linkers is pH dependent.
- a linker can form a stable linkage between an agent and a delivery-enhancing transporter at an acidic pH (e.g., pH 6.5 or less, more preferably about 6 or less, and still more preferably about 5.5 or less).
- an acidic pH e.g., pH 6.5 or less, more preferably about 6 or less, and still more preferably about 5.5 or less.
- physiological pH e.g., pH 7 or greater, preferably about pH 7.4
- pH sensitivity can be obtained by, for example, including a functional group that, when protonated (i.e., at an acidic pH), does not act as a nucleophile.
- the functional group is no longer protonated and thus can act as a nucleophile.
- suitable functional groups include, for example, N and S.
- the linking moiety is cleaved through self- immolation.
- Such linking moieties in a transport moiety-biologically active compound conjugate contain a nucleophile (e.g., oxygen, nitrogen and sulfur) distal to the biologically active compound and a cleavable group (e.g., ester, carbonate, carbamate and thiocarbamate) proximal to the biologically active compound. Intramolecular attack of the nucleophile on the cleavable group results in the scission of a covalent bond, thereby releasing the linking moiety from the biologically active compound.
- a nucleophile e.g., oxygen, nitrogen and sulfur
- a cleavable group e.g., ester, carbonate, carbamate and thiocarbamate
- conjugates containing self-immolating linking moieties are represented by structures 3, 4 and 5:
- R 1 is the biologically active compound
- X is a linkage formed between a functional group on the biologically active compound and a terminal functional group on the linking moiety
- Y is a linkage formed from a functional group on the transport moiety and a functional group on the linking moiety
- A is N or CH
- R 2 is hydrogen, alkyl, aryl, arylalkyl, acyl or allyl
- R 3 is the transport moiety
- R 4 is S, O, NR 6 or CR 7 R 8
- R 5 is H, OH, SH or NHR 6
- R 6 is hydrogen, alkyl, aryl, acyl or allyl
- R 7 and R 8 are independently hydrogen or alkyl
- k and m are independently either 1 or 2
- n is an integer ranging from 1 to 10.
- Non- limiting examples of the X and Y linkages are (in either orientation): -C(O)O-, -C(O)NH-, -OC(O)NH-, -S-S-, -C(S)O-, -C(S)NH-, -NHC(O)NH-, -SO 2 NH-, -SONH-, phosphate, phosphonate and phosphinate.
- X will preferably be -OC(O)- or -OC(O)NH-.
- linking group when the linking group is attached to an amino terminus of the transport moiety, Y will preferably be -C(O)NH-, -NHC(O)NH-, -SO 2 NH-, -SONH- or - OC(O)NH- and the like.
- NH is shown for brevity, but each of the linkages (X and Y) can contain substituted (e.g., N-alkyl or N-acyl) linkages as well.
- Example 19 Preparation of a conjugate containing this linking group is illustrated in Example 19 ( Figure 6).
- cyclosporin A is treated with chloroacetic anhydride to form the chloroacetate ester 6i (numbering in Figure 6) which is then combined with benzylamine to form the N-benzyl glycine conjugate 6ii.
- N-benzyl group can be replaced with other groups (e.g., alkyl, aryl, allyl and the like) or that methylene groups can be replaced with, for example, ethylene, propylene and the like.
- the methylene groups are retained as shown in 3 a, to provide an appropriate steric or spatial orientation that allows the linkage to be cleaved in vivo (see Figure 6B).
- A is N;
- R 2 is benzyl; k, m and n are 1; X is -OC(O)- and Y is -C(O)NH-.
- Linkages of structure 4, are exemplified by formula 4a:
- acyclovir can be attached to the C-terminus of a transport moiety using a similar linkage formed between acyclovir ⁇ - chloroacetate ester and a heptamer of D-arginine having an C-terminal cysteine residue.
- the cysteine residue is provided on the r 7 transport moiety as a C-terminal amide and the linkage has the form:
- the conjugate is represented by formula 5, in which X is -OC(O)-; Y is -C(O)NH-; R 4 is S; R 5 is NHR 6 ; and the subscripts k and m are each 1.
- the conjugate is represented by formula 2, in which X is -OC(O)-; Y is -NHC(O)-; R 4 is S; R 5 is CONH 2 ; and the subscripts k and m are each 1.
- Particularly preferred conjugates are those in which
- R 6 is hydrogen, methyl, allyl, butyl or phenyl.
- Linking groups represented by the conjugates shown in formula 6 are generally of the heterobifunctional type (e.g, ⁇ -aminocaproic acid, serine, homoserine, - aminobutyric acid, and the like), although suitably protected dicarboxylic acids or diamines are also useful with certain biological agents.
- R 5 is NHR 6 , wherein R 6 is hydrogen, methyl, allyl, butyl or phenyl; k is 2; X is -C(O)O-; and Y is -C(O)NH-.
- Self-immolating linkers typically undergo intramolecular cleavage with a half-life between about 10 minutes and about 24 hours in water at 37°C at a pH of approximately 7.4.
- the cleavage half-life is between about 20 minutes and about 4 hours in water at 37°C at a pH of approximately 7.4. More preferably, the cleavage half- life is between about 30 minutes and about 2 hours in water at 37°C at a pH of approximately 7.4.
- R 2 in structure 3 is preferably methyl, ethyl, propyl, butyl, allyl, benzyl or phenyl.
- the backbone amine group of structure 3 is protonated at acidic pH (e.g., pH 5.5).
- acidic pH e.g., pH 5.5
- the amine cannot serve as a nucleophile inducing intramolecular cleavage when it is protonated.
- the amine Upon introduction of the conjugate into a medium at physiological pH (7.4), however, the amine is unprotonated a significant portion of the time. The cleavage half-life is correspondingly reduced.
- cleavage of a self-immolating linker occurs in two steps: intramolecular reaction of a nucleophilic group resulting in the cleavage of a portion of the linking moiety; and, elimination of the remaining portion of the linking moiety.
- the first step of the cleavage is rate-limiting and can be fine-tuned for pH sensitivity and half-life.
- Structure 6 is an example of a two-step, self-immolating moiety that is incorporated into a transport moiety-biologically active compound conjugate:
- R is the biologically active compound
- X represents a linkage between a functional group on the biologically active compound and a functional group on the linking moiety
- Ar is a substituted or unsubstituted aryl group, wherein the methylene substituent and phenolic oxygen atom are either ortho ox para to one another
- R is the transport moiety
- R 4 is S, O, NR 6 or CR 7 R 8
- R 5 is H, OH, SH or NHR 6
- R 6 is hydrogen, alkyl, aryl, arylalkyl, acyl or allyl
- R 7 and R 8 are independently hydrogen or alkyl
- k and m are independently either 1 or 2.
- Example 23 The construction of a conjugate containing a linking group of formula 6a is provided in Example 23 (see also Figure 41).
- the ⁇ - chloroacetate ester of 2,4-dimethyl-4-hydroxymethylphenol (41i) is coupled to retinoic acid (41 ii) using dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP) to provide the intermediate 41iii.
- DCC dicyclohexylcarbodiimide
- DMAP 4-dimethylaminopyridine
- Subsequent coupling of 41iii with a cysteine residue present on the N-terminus of an arginine heptamer transport moiety provides the target conjugate 41iv.
- the linking groups used in the conjugates of formula 6, are those in which Ar is an substituted or unsubstituted phenylene group; R 4 is S; R 5 is NHR 6 , wherein R 6 is hydrogen, methyl, allyl, butyl, acetyl or phenyl; k and m are 1; X is -C(O)O-; and Y is -C(O)O- or -C(O)NH-. More preferably, R 6 is hydrogen or acetyl. While linking groups above have been described with reference to conjugates containing arginine heptamers, one of skill in the art will understand that the technology is readily adapted to conjugates with the "spaced" arginine transport moieties of the present invention.
- linking groups for use in the present invention have been described in copending PCT applications. See, for example PCT applications US98/10571 (Publication No. WO 9852614) and US00/23440 (Publication No. WO01/13957) which describe linking groups for similar compositions, e.g., conjugates of biologically active agents and transport oligomers.
- the linking technology described therein can be used in the present compositions in a similar manner.
- the linking moiety contains a first cleavable group distal to the biologically active compound and a second cleavable group proximal to the biologically active compound.
- Cleavage of the first cleavable group yields a nucleophile capable of reacting intramolecularly with the second cleavable group, thereby cleaving the linking moiety from the biologically active compound.
- methods by which the first group is cleaved include photo-illumination and enzyme mediated hydrolysis. This methodology has been illustrated for various related small molecule conjugates discussed in PCT application US98/10571 (Publication No. WO 9852614).
- the conjugate can include a disulfide linkage, as illustrated in Figure 5A of PCT application USOO/23440 (Publication No. WO01/13957), (see also, PCT application US98/10571 (Publication No. WO 9852614)), which shows a conjugate (I) containing a transport polymer T which is linked to a cytotoxic agent, 6-mercaptopurine, by an N-acetyl-protected cysteine group which serves as a linker.
- the cytotoxic agent is attached by a disulfide bond to the 6-mercapto group, and the transport polymer is bound to the cysteine carbonyl moiety via an amide linkage.
- Example 9A of PCT application US98/10571 A method for synthesizing a disulfide-containing conjugate is provided in Example 9A of PCT application US98/10571.
- the product described therein contains a heptamer of Arg residues which is linked to 6-mercaptopurine by an N-acetyl-Cys-Ala-Ala linker, where the Ala residues are included as an additional spacer to render the disulfide more accessible to thiols and reducing agents for cleavage within a cell.
- the linker in this example also illustrates the use of amide bonds, which can be cleaved enzymatically within a cell.
- the conjugate includes a photocleavable linker that is cleaved upon exposure to electromagnetic radiation.
- a conjugate (II) containing a transport polymer T which is linked to 6-mercaptopurine via a wet ⁇ -nitrobenzoate linking moiety.
- Polymer T is linked to the nitrobenzoate moiety by an amide linkage to the benzoate carbonyl group, and the cytotoxic agent is bound via its 6-mercapto group to the p-methylene group.
- the compound can be formed by reacting 6-mercaptopurine with p-bromomethyl-m-nitrobenzoic acid in the presence of NaOCH 3 /methanol with heating, followed by coupling of the benzoate carboxylic acid to a transport polymer, such as the amino group of a ⁇ -aminobutyric acid linker attached to the polymer (see also, e.g., Example 9B of PCT application US98/10571). Photo-illumination of the conjugate causes release of the 6-mercaptopurine by virtue of the nitro group that is ortho to the mercaptomethyl moiety.
- This approach finds utility in phototherapy methods as are known in the art, particularly for localizing drug activation to a selected area of the body.
- the cleavable linker contains first and second cleavable groups that can cooperate to cleave the oligomer from the biologically active agent, as illustrated by the following approaches. That is, the cleavable linker contains a first cleavable group that is distal to the agent, and a second cleavable group that is proximal to the agent, such that cleavage of the first cleavable group yields a linker-agent conjugate containing a nucleophilic moiety capable of reacting intramolecularly to cleave the second cleavable group, thereby releasing the agent from the linker and oligomer.
- Figure 5C shows a conjugate (III) containing a transport polymer T linked to the anticancer agent, 5-fluorouracil (5FU).
- the linkage is provided by a modified lysyl residue.
- the transport polymer is linked to the -amino group, and the 5-fluorouracil is linked via the -carbonyl.
- the lysyl ⁇ -amino group has been modified to a carbamate ester of o-hydroxymethyl nitrobenzene, which comprises a first, photolabile cleavable group in the conjugate.
- Photo-illumination severs the nitrobenzene moiety from the conjugate, leaving a carbamate that also rapidly decomposes to give the free ⁇ -amino group, an effective nucleophile.
- Intramolecular reaction of the ⁇ -amino group with the amide linkage to the 5-fluorouracil group leads to cyclization with release of the 5-fluorouracil group.
- Still other linkers useful in the present invention are provided in PCT application USOO/23440 (Publication No. WO01/13957).
- Figure 5D of USOO/23440 illustrates a conjugate (IV) containing a delivery-enhancing transporter T linked to 2'-oxygen of the anticancer agent, paclitaxel.
- the linkage is provided by a linking moiety that includes (i) a nitrogen atom attached to the delivery-enhancing transporter, (ii) a phosphate monoester located para to the nitrogen atom, and (iii) a carboxymethyl group meta to the nitrogen atom, which is joined to the 2'-oxygen of paclitaxel by a carboxylate ester linkage.
- a linking moiety that includes (i) a nitrogen atom attached to the delivery-enhancing transporter, (ii) a phosphate monoester located para to the nitrogen atom, and (iii) a carboxymethyl group meta to the nitrogen atom, which is joined to the 2'-oxygen of paclitaxel by a carboxylate ester linkage.
- Enzymatic cleavage of the phosphate group from the conjugate affords a free phenol hydroxyl group.
- This nucleophilic group then reacts intramolecularly with the carboxylate ester to release free paclitaxel, fully capable of
- a delivery- enhancing transporter is linked to a biologically active agent, e.g., paclitaxel, by an aminoalkyl carboxylic acid.
- the linker amino group is joined to the delivery-enhancing transporter by an amide linkage, and is joined to the paclitaxel moiety by an ester linkage. Enzymatic cleavage of the amide linkage releases the delivery-enhancing transporter and produces a free nucleophilic amino group. The free amino group can then react intramolecularly with the ester group to release the linker from the paclitaxel.
- the conjugate includes a linker that is labile at one pH but is stable at another pH.
- Figure 6 of PCT application USOO/23440 (Publication No. WOOl/13957) illustrates a method of synthesizing a conjugate with a linker that is cleaved at physiological pH but is stable at acidic pH.
- the linker is cleaved in water at a pH of from about 6.6 to about 7.6.
- the linker is stable in water at a pH from about 4.5 to about 6.5.
- the delivery-enhancing transporters find use in therapeutic, prophylactic and diagnostic applications.
- the delivery-enhancing transporters can carry a diagnostic or biologically active reagent into and across one or more layers of skin or other epithelial tissue (e.g., gastrointestinal, lung, ocular and the like), or across endothelial tissues such as the blood brain barrier. This property makes the reagents useful for treating conditions by delivering agents that must penetrate across one or more tissue layers in order to exert their biological effect.
- the transporters of the present invention can also be used alone, or in combination with another therapeutic or other compound, as a furin inhibitor.
- the synthetic transporters described herein can be used to inhibit furins.
- Furins are proteases that convert a variety of pro-proteins to their active components. Inhibition of furins is useful, for instance, for treating infections by viruses that rely on furin activity for virulence or replication. See, e.g., Molloy, et al, T. Cell Biol 9:28- 35 (1999).
- the transporters of the invention are useful inhibitors of capthesin
- poly arginine compounds are inhibitors of capthesin C.
- the transporters of the invention including those comprising synthetic amino acids, are useful to inhibit capthesin C.
- a furin inhibition assay can be used to screen for additional transporters.
- candidate transporter compounds can be tested for their ability to compete with poly arginine for their ability to bind furins or capthesin C using standard competition assays.
- candidate transporters can be screened for their ability to inhibit furin protease activity as discussed in Cameron et al, supra, and Horn et al, supra. Particularly active candidates can then be further tested for their ability to act as transporters into and/or across tissues such as the epithelium.
- compositions and methods of the present invention have particular utility in the area of human and veterinary therapeutics.
- administered dosages will be effective to deliver picomolar to micromolar concentrations of the therapeutic composition to the effector site.
- Appropriate dosages and concentrations will depend on factors such as the therapeutic composition or drug, the site of intended delivery, and the route of administration, all of which can be derived empirically according to methods well known in the art. Further guidance can be obtained from studies using experimental animal models for evaluating dosage, as are known in the art.
- Administration of the compounds of the invention with a suitable pharmaceutical excipient as necessary can be carried out via any of the accepted modes of administration.
- administration can be, for example, intravenous, topical, subcutaneous, transcutaneous, intramuscular, oral, intra-joint, parenteral, peritoneal, intranasal, or by inhalation.
- Suitable sites of administration thus include, but are not limited to, skin, bronchial, gastrointestinal, anal, vaginal, eye, and ear.
- the formulations may take the form of solid, semi-solid, lyophilized powder, or liquid dosage forms, such as, for example, tablets, pills, capsules, powders, solutions, suspensions, emulsions, suppositories, retention enemas, creams, ointments, lotions, aerosols, eye drops, or the like, preferably in unit dosage forms suitable for simple administration of precise dosages.
- compositions typically include a conventional pharmaceutical carrier or excipient and may additionally include other medicinal agents, carriers, adjuvants, and the like.
- the composition will be about 5% to 75% by weight of a compound or compounds of the invention, with the remainder consisting of suitable pharmaceutical excipients.
- Appropriate excipients can be tailored to the particular composition and route of administration by methods well known in the art, e.g., REMINGTON'S PHARMACEUTICAL SCIENCES, 18TH ED., Mack Publishing Co., Easton, PA (1990).
- excipients include pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, talcum, cellulose, glucose, gelatin, sucrose, magnesium carbonate, and the like.
- the composition may take the form of a solution, suspension, tablet, pill, capsule, powder, sustained-release formulation, and the like.
- the pharmaceutical compositions take the form of a pill, tablet or capsule, and thus, the composition can contain, along with the biologically active conjugate, any of the following: a diluent such as lactose, sucrose, dicalcium phosphate, and the like; a disintegrant such as starch or derivatives thereof; a lubricant such as magnesium stearate and the like; and a binder such a starch, gum acacia, polyvinylpyrrolidone, gelatin, cellulose and derivatives thereof.
- a diluent such as lactose, sucrose, dicalcium phosphate, and the like
- a disintegrant such as starch or derivatives thereof
- a lubricant such as magnesium stearate and the like
- a binder such a starch, gum acacia, polyvinylpyrrolidone, gelatin, cellulose and derivatives thereof.
- the active compounds of the formulas may be formulated into a suppository comprising, for example, about 0.5% to about 50% of a compound of the invention, disposed in a polyethylene glycol (PEG) carrier (e.g., PEG 1000 [96%] and PEG 4000 [4%]).
- PEG polyethylene glycol
- Liquid compositions can be prepared by dissolving or dispersing compound
- aqueous saline e.g. 0.9% w/v sodium chloride
- aqueous dextrose e.g., glycerol
- ethanol e.g., ethanol
- the active compounds may also be formulated into a retention enema.
- composition to be administered may also contain minor amounts of non-toxic auxiliary substances such as wetting or emulsifying agents, pH buffering agents, such as, for example, sodium acetate, sorbitan monolaurate, or triethanolamine oleate.
- auxiliary substances such as wetting or emulsifying agents, pH buffering agents, such as, for example, sodium acetate, sorbitan monolaurate, or triethanolamine oleate.
- the composition is administered in any suitable format, such as a lotion or a transdermal patch.
- the composition can be delivered as a dry powder (e.g., Inhale Therapeutics) or in liquid form via a nebulizer. Methods for preparing such dosage forms are known or will be apparent to those skilled in the art; for example, see Remington's Pharmaceutical Sciences, supra., and similar publications.
- the composition to be administered will, in any event, contain a quantity of the pro-drug and/or active compound(s) in a pharmaceutically effective amount for relief of the condition being treated when administered in accordance with the teachings of this invention.
- the compounds of the invention are administered in a therapeutically effective amount, i.e., a dosage sufficient to effect treatment, which will vary depending on the individual and condition being treated.
- a therapeutically effective daily dose is from 0.1 to 100 mg/kg of body weight per day of drug.
- Most conditions respond to administration of a total dosage of between about 1 and about 30 mg/kg of body weight per day, or between about 70 mg and 2100 mg per day for a 70 kg person.
- Stability of the conjugate can be further controlled by the composition and stereochemistry of the backbone and sidechains of the delivery-enhancing transporters.
- D-isomers are generally resistant to endogenous proteases, and therefore have longer half-lives in serum and within cells. D- polypeptide polymers are therefore appropriate when longer duration of action is desired.
- L- polypeptide polymers have shorter half-lives due to their susceptibility to proteases, and are therefore chosen to impart shorter acting effects. This allows side-effects to be averted more readily by withdrawing therapy as soon as side-effects are observed.
- Polypeptides comprising mixtures of D and L-residues have intermediate stabilities. Homo-D-polymers are generally preferred.
- the delivery-enhancing transporters of the invention make possible the delivery of biologically active and diagnostic agents across the skin.
- the transporters can deliver an agent across the stratum corneum, which previously had been a nearly impenetrable barrier to drug delivery.
- the stratum corneum the outermost layer of the skin, is composed of several layers of dead, keratin-filled skin cells that are tightly bound together by a "glue" composed of cholesterol and fatty acids.
- the agents can enter the viable epidermis, which is composed of the stratum granulosum, stratum lucidum and stratum germinativum which, along with the stratum corneum, make up the epidermis.
- Delivery in some embodiments of the invention is through the epidermis and into the dermis, including one or both of the papillary dermis and the reticular dermis.
- This ability to obtain penetration of one or more layers of the skin can greatly enhance the efficacy of compounds such as antibacterials, antifungals, antivirals, antiproliferatives, immunosuppressives, vitamins, analgesics, hormones, and the like. Numerous such compounds are known to those of skill in the art (see, e.g. , Hardman and Limbird, Goodman & Gilman 's The Pharmacological Basis of Therapeutics, McGraw-Hill, New York, 1996).
- the agent is delivered into a blood vessel that is present in the epithelial tissue, thus providing a means for delivery of the agent systemically. Delivery can be either intrafollicular or interfollicular, or both. Pretreatment of the skin is not required for delivery of the conjugates.
- the delivery-enhancing transporters are useful for delivering cosmetics and agents that can treat skin conditions. Target cells in the skin that are of interest include, for example, fibroblasts, epithelial cells and immune cells.
- the transporters provide the ability to deliver compounds such as antiinflammatory agents to immune cells found in the dermis.
- Glucocorticoids are among the compounds for which delivery across skin can be enhanced by the delivery-enhancing transporters of the invention.
- Conjugated glucocorticoids of the invention are useful for treating inflammatory skin diseases, for example.
- exemplary glucocorticoids include, e.g., hydrocortisone, prenisone (deltasone) and predrisonlone (hydeltasol).
- Examples of particular conditions include eczema (including atopic dermatitis, contact dermatitis, allergic dermatitis), bullous disease, collagen vascular diseases, sarcoidosis, Sweet's disease, pyoderma gangrenosum, Type I reactive leprosy, capillary hemangiomas, lichen planus, exfoliative dermatitis, erythema nodosum, hormonal abnormalities (including acne and hirsutism), as well as toxic epidermal necrolysis, erythema multiforme, cutaneous T-cell lymphoma, discoid lupus erythematosus, and the like.
- eczema including atopic dermatitis, contact dermatitis, allergic dermatitis
- bullous disease collagen vascular diseases, sarcoidosis, Sweet's disease, pyoderma gangrenosum, Type I reactive leprosy, capillary hemangiomas, lichen planus
- Retinoids are another example of a biologically active agent for which one can use the delivery-enhancing transporters of the invention to enhance delivery into and across one or more layers of the skin or other epithelial or endothelial tissue.
- Retinoids that are presently in use include, for example retinol, tretinoin, isotretinoin, etretinate, acitretin, and arotinoid.
- Conditions that are treatable using retinoids conjugated to the delivery- enhancing transporters of the invention include, but are not limited to, acne, keratinization disorders, skin cancer, precancerous conditions, psoriasis, cutaneous aging, discoid lupus erythematosus, scleromyxedema, verrucous epidermal nevus, subcorneal pustular dermatosis, Reiter's syndrome, warts, lichen planus, acanthosis nigricans, sarcoidosis, Grover's disease, porokeratosis, and the like.
- Cytotoxic and immunosuppressive drugs constitute an additional class of drugs for which the delivery-enhancing transporters of the invention are useful.
- agents are commonly used to treat hyperproliferative diseases such as psoriasis, as well as for immune diseases such as bullous dermatoses and leukocytoclastic vasculitis.
- examples of such compounds that one can conjugate to the delivery-enhancing transporters of the invention include, but are not limited to, antimetabolites such as methotrexate, azathioprine, fluorouracil, hydroxyurea, 6-thioquanine, mycophenolate, chlorambucil, vinicristine, vinblasrine and dactinomycin.
- antimetabolites such as methotrexate, azathioprine, fluorouracil, hydroxyurea, 6-thioquanine, mycophenolate, chlorambucil, vinicristine, vinblasrine and dactinomycin.
- alkylating agents such as cyclophosphamide, mechloroethamine hydrochloride, carmustine.
- Taxol, tacrolimus and vinblastine are additional examples of useful biological agents, as are dapsone and sulfasalazine.
- Immunosuppressive drugs such as cyclosporin, FK506 (tacrolimus), and ascomycins such as rapamycin (e.g., U.S. Patent 5,912,253) and analogs of such compounds are of particular interest (e.g., Mollinson et al, Current Pharm. Design 4(5):367-380 (1998); U.S. Patent Nos.
- Cyclosporins include, e.g., cyclosporin A, B, C, D, G and M. See, e.g., U.S. Patent No. 6,007,840; and 6,004,973.
- such compounds are useful in treating psoriasis, eczema (including atopic dermatitis, contact dermatitis, allergic dermatitis) and alopecia areata.
- the delivery-enhancing transporters can be conjugated to agents that are useful for treating conditions such as lupus erythematosus (both discoid and systemic), cutaneous dermatomyositis, porphyria cutanea tarda and polymorphous light eruption.
- agents useful for treating such conditions include, for example, quinine, chloroquine, hydroxychloroquine, and quinacrine.
- the delivery-enhancing transporters of the invention are also useful for transdermal delivery of antiinfective agents.
- antibacterial, antifungal and antiviral agents can be conjugated to the delivery-enhancing transporters.
- Antibacterial agents are useful for treating conditions such as acne, cutaneous infections, and the like.
- Antifungal agents can be used to treat tinea corporis, tinea pedis, onychomycosis, candidiasis, tinea versicolor, and the like. Because of the delivery-enhancing properties of the conjugates, these conjugates are useful for treating both localized and widespread infections.
- Antifungal agents are also useful for treating onychomycosis.
- antifungal agents include, but are not limited to, azole antifungals such as itraconazole, myconazole and fluconazole.
- antiviral agents include, but are not limited to, acyclovir, famciclovir, and valacyclovir. Such agents are useful for treating viral diseases, e.g., herpes.
- antihistamines Another example of a biologically active agent for which enhancement of delivery by conjugation to the delivery-enhancing transporters of the invention is desirable are the antihistamines. These agents are useful for treating conditions such as pruritus due to urticaria, atopic dermatitis, contact dermatitis, psoriasis, and many others. Examples of such reagents include, for example, terfenadine, astemizole, lorotadine, cetirizine, acrivastine, temelastine, cimetidine, ranitidine, famotidine, nizatidine, and the like. Tricyclic antidepressants can also be delivered using the delivery-enhancing transporters of the invention. Topical antipsoriasis drugs are also of interest. Agents such as corticosteroids, calcipotriene, and anthralin can be conjugated to the delivery-enhancing transporters of the invention and applied to skin.
- the delivery-enhancing transporters of the invention are also useful for enhancing delivery of photochemo therapeutic agents into and across one or more layers of skin and other epithelial tissues.
- Such compounds include, for example, the psoralens, and the like.
- Sunscreen components are also of interest; these include -aminobenzoic acid esters, cinnamates and salicylates, as well as benzophenones, anthranilates, and avobenzone. Pain relief agents and local anesthetics constitute another class of compounds for which conjugation to the delivery-enhancing transporters of the invention can enhance treatment.
- Lidocaine, bupibacaine, novocaine, procaine, tetracaine, benzocaine, cocaine, and the opiates are among the compounds that one can conjugate to the delivery-enhancing transporters of the invention.
- Other biological agents of interest include, for example, minoxidil, keratolytic agents, destructive agents such as podophyllin, hydroquinone, capsaicin, masoprocol, colchicine, and gold.
- Treatment of inflamed joints such as occurs in rhematoid arthritis can also be treated with compounds useful for such treatments conjugated to the transporters of the invention.
- the delivery-enhancing transporters of the invention are also useful for delivery of conjugated drugs by gastrointestinal administration.
- Gastrointestinal administration can be used for both systemically active drugs, and for drugs that act in the gastrointestinal epithelium.
- inflammatory bowel disease such as Crohn's disease (e.g., cyclosporin, FK506 and ascomycins; amino salicylates such as sulfasalazine and mesalamine; corticosteroids, e.g., prednisone and methylprednisolone; immune modifiers, e.g., azathioprine, 6MP, methotrexate; and antibiotics, e.g., metronidazole, ampicillin, ciprofloxacin, and others).
- Crohn's disease e.g., cyclosporin, FK506 and ascomycins
- amino salicylates such as sulfasalazine and mesalamine
- corticosteroids e.g., prednisone and methylprednisolone
- immune modifiers e.g., azathioprine, 6MP, methotrexate
- antibiotics e.g.
- Ulcer treatments include, for example, drugs that reduce gastric acid secretion, such as H 2 histamine inhibitors (e.g., cymetidine and ranitidine) and inhibitors of the proton-potassium ATPase (e.g., lansoprazle and omeprazle), and antibiotics directed at Helicobacter pylori.
- H 2 histamine inhibitors e.g., cymetidine and ranitidine
- inhibitors of the proton-potassium ATPase e.g., lansoprazle and omeprazle
- antibiotics directed at Helicobacter pylori e.g., lansoprazle and omeprazle
- Compounds useful for the treatment of constipation can also be used in conjunction with the transporters of the invention.
- Useful compounds for treating constipation include, e.g., surfactant laxatives such as docusate sodium, poloxamer 188, dehydrochloric acid and ricinoleic acid.
- Exemplary stimulant laxatives include, e.g., phenolphthalein, bisacodyl and anthraquinone laxatives such as danthron.
- Antibiotics are among the biologically active agents that are useful when conjugated to the delivery-enhancing transporters of the invention, particularly those that act on invasive bacteria, such as Shigella, Salmonella, and Yersinia.
- Such compounds include, for example, norfloxacin, ciprofloxacin, trimethoprim, sulfamethyloxazole, and the like.
- Anti-neoplastic agents for example, for the treatment of colon cancer, can also be conjugated to the delivery-enhancing transporters of the invention and administered by the gastrointestinal route.
- GI gastrointestinal
- Methods and composition useful for delivery to the GI tract or colon are described in, e.g., U.S. Patent Nos. 6,183,466 and 6,120,803.
- the delivery-enhancing transporters of the invention can also used to enhance administration of drugs through the respiratory tract.
- the respiratory tract which includes the nasal mucosa, hypopharynx, and large and small airway structures, provides a large mucosal surface for drug abso ⁇ tion.
- the enhanced penetration of the conjugated agents into and across one or more layers of the epithelial tissue that is provided by the delivery- enhancing transporters of the invention results in amplification of the advantages that respiratory tract delivery has over other delivery methods. For example, lower doses of an agent are often needed to obtain a desired effect, a local therapeutic effect can occur more rapidly, and systemic therapeutic blood levels of the agent are obtained quickly. Rapid onset of pharmacological activity can result from respiratory tract administration. Moreover, respiratory tract administration generally has relatively few side effects.
- the transporters of the invention can be used to deliver biological agents that are useful for treatment of pulmonary conditions.
- conditions treatable by nasal administration include, for example, asthma.
- These compounds include antiinflammatory agents, such as corticosteroids, cromolyn, and nedocromil, bronchodialators such as ⁇ 2- selective adronergic drugs and theophylline, and immunosuppressive drugs (e.g., cyclosporin and FK506).
- Other conditions include, for example, allergic rhinitis (which can be treated with glucocorticoids), and chronic obstructive pulmonary disease (emphysema).
- Other drugs that act on the pulmonary tissues and can be delivered using the transporters of the invention include beta-agonists, mast cell stabilizers, antibiotics, antifungal and antiviral agents, surfactants, vasoactive drugs, sedatives and hormones.
- Respiratory tract administration is useful not only for treatment of pulmonary conditions, but also for delivery of drugs to distant target organs via the circulatory system.
- a wide variety of such drugs and diagnostic agents can be administered through the respiratory tract after conjugation to the delivery-enhancing transporters of the invention.
- the delivery-enhancing transporters are also useful for delivering biologically active and diagnostic agents across the blood brain barrier.
- the agents are useful for treating ischemia (e.g., using an anti-apoptotic drug), as well as for delivering neurotransmitters and other agents for treating various conditions such as schizophrenia, Parkinson's disease, pain (e.g., mo ⁇ hine, the opiates).
- the 5-hydroxytryptamine receptor antagonist is useful for treating conditions such as migraine headaches and anxiety.
- the delivery-enhancing transporters of the invention are also useful for delivery of diagnostic imaging and contrast agents into and across one or more layers of an epithelial and/or endothelial tissue.
- diagnostic agents include substances that are labeled with radioactivity, such as "mTc glucoheptonate, or substances used in magnetic resonance imaging (MRI) procedures such as gadolinium doped chelation agents (e.g. Gd- DTPA).
- Other examples of diagnostic agents include marker genes that encode proteins that are readily detectable when expressed in a cell including, but not limited to, ⁇ -galactosidase, green fluorescent protein, luciferase, and the like.
- a wide variety of labels may be employed, such as radionuclides, fluors, enzymes, enzyme substrates, enzyme cofactors, enzyme inhibitors, ligands (particularly haptens), etc.
- the delivery-enhancing transporters can be conjugated to a wide variety of biologically active agents and molecules that have diagnostic use.
- Small organic molecule therapeutic agents can be advantageously attached to linear polymeric compositions as described herein, to facilitate or enhance transport across one or more layers of an epithelial or endothelial tissue.
- delivery of highly charged agents such as levodopa (L-3,4-dihydroxy-phenylalanine; L-DOPA) may benefit by linkage to delivery-enhancing transporters as described herein.
- L-DOPA levodopa
- Peptoid and peptidomimetic agents are also contemplated (e.g., Langston (1997) DDT2:255; Giannis et al. (1997) Advances Drug Res. 29:1).
- the invention is advantageous for delivering small organic molecules that have poor solubilities in aqueous liquids, such as serum and aqueous saline.
- the conjugate preferably includes a cleavable linker for releasing free drug after passing through an epithelial tissue.
- Figure 5D and Figure 5E are illustrative of another aspect of the invention, comprising taxane- and taxoid anticancer conjugates which have enhanced trans-epithelial tissue transport rates relative to corresponding non-conjugated forms.
- the conjugates are particularly useful for inhibiting growth of cancer cells. Taxanes and taxoids are believed to manifest their anticancer effects by promoting polymerization of micro tubules (and inhibiting depolymerization) to an extent that is deleterious to cell function, inhibiting cell replication and ultimately leading to cell death.
- TAXOL naturally occurring, synthetic, or bioengineered analogs having a backbone core that contains the A, B, C and D rings of paclitaxel, as illustrated in Figure 5G.
- Taxoid refers to naturally occurring, synthetic or bioengineered analogs of paclitaxel that contain the basic A, B and C rings of paclitaxel, as shown in Figure 5H. Substantial synthetic and biological information is available on syntheses and activities of a variety of taxane and taxoid compounds, as reviewed in Suffness (1995) Taxol: Science and Applications, CRC Press, New York, NY, pp. 237-239, particularly in Chapters 12 to 14, as well as in the subsequent paclitaxel literature.
- the delivery-enhancing transporter is conjugated to the taxane or taxoid moiety via any suitable site of attachment in the taxane or taxoid.
- the transport polymer is linked via a C2'-oxygen atom, C7-oxygen atom, using linking strategies as above. Conjugation of a transport polymer via a C7-oxygen leads to taxane conjugates that have anticancer and antitumor activity despite conjugation at that position. Accordingly, the linker can be cleavable or non-cleavable. Conjugation via the C2'-oxygen significantly reduces anticancer activity, so that a cleavable linker is preferred for conjugation to this site.
- Taxane and taxoid conjugates of the invention have improved water solubility relative to taxol ( ⁇ 0.25 ⁇ g/mL) and taxotere (6-7 ⁇ g/mL). Therefore, large amounts of solubilizing agents such as "CREMOPHOR EL” (polyoxyethylated castor oil), polysorbate 80 (polyoxyethylene sorbitan monooleate, also known as "TWEEN 80"), and ethanol are not required, so that side-effects typically associated with these solubilizing agents, such as anaphylaxis, dyspnea, hypotension, and flushing, can be reduced.
- solubilizing agents such as "CREMOPHOR EL” (polyoxyethylated castor oil), polysorbate 80 (polyoxyethylene sorbitan monooleate, also known as "TWEEN 80"), and ethanol are not required, so that side-effects typically associated with these solubilizing agents, such as anaphylaxis, dyspn
- Metals can be transported into and across one or more layers of epithelial and endothelial tissues using chelating agents such as texaphyrin or diethylene triamine pentacetic acid (DTP A), conjugated to a delivery-enhancing transporter of the invention, as illustrated by Example .
- chelating agents such as texaphyrin or diethylene triamine pentacetic acid (DTP A)
- DTP A diethylene triamine pentacetic acid
- conjugates are useful for delivering metal ions for imaging or therapy.
- Exemplary metal ions include Eu, Lu, Pr, Gd, Tc99m, Ga67, Inl 11, Y90, Cu67, and Co57.
- Preliminary membrane-transport studies with conjugate candidates can be performed using cell-based assays such as described in the Example section below. For example, using europium ions, cellular uptake can be monitored by time-resolved fluorescence measurements. For metal ions that are cytotoxic, uptake can be monitored by cytotoxicity.
- the enhanced transport methods of the invention are particularly suited for enhancing transport into and across one or more layers of an epithelial or endothelial tissue for a number of macromolecules, including, but not limited to proteins, nucleic acids, polysaccharides, and analogs thereof.
- Exemplary nucleic acids include oligonucleotides and polynucleotides formed of DNA and RNA, and analogs thereof, which have selected sequences designed for hybridization to complementary targets (e.g'., antisense sequences for single- or double-stranded targets), or for expressing nucleic acid transcripts or proteins encoded by the sequences.
- Analogs include charged and preferably uncharged backbone analogs, such as phosphonates (preferably methyl phosphonates), phosphoramidates (N3' or N5'), thiophosphates, uncharged mo ⁇ holino-based polymers, and protein nucleic acids (PNAs).
- phosphonates preferably methyl phosphonates
- phosphoramidates N3' or N5'
- thiophosphates uncharged mo ⁇ holino-based polymers
- PNAs protein nucleic acids
- Such molecules can be used in a variety of therapeutic regimens, including enzyme replacement therapy, gene therapy, and anti-sense therapy, for example.
- protein nucleic acids are analogs of DNA in which the backbone is structurally homomo ⁇ hous with a deoxyribose backbone.
- the backbone consists of N-(2-aminoethyl)glycine units to which the nucleobases are attached.
- PNAs containing all four natural nucleobases hybridize to complementary oligonucleotides obeying Watson-Crick base-pairing rules, and is a true DNA mimic in terms of base pair recognition (Egholm et al. (1993) Nature 365:566-568.
- the backbone of a PNA is formed by peptide bonds rather than phosphate esters, making it well-suited for anti-sense applications.
- PNA/DNA or PNA/RNA duplexes that form exhibit greater than normal thermal stability.
- PNAs have the additional advantage that they are not recognized by nucleases or proteases.
- PNAs can be synthesized on an automated peptides synthesizer using standard t-Boc chemistry. The PNA is then readily linked to a transport polymer of the invention. Examples of anti-sense oligonucleotides whose transport into and across epithelial and endothelial tissues can be enhanced using the methods of the invention are described, for example, in U.S. Patent 5,594,122. Such oligonucleotides are targeted to treat human immunodeficiency virus (HIV).
- HIV human immunodeficiency virus
- Conjugation of a transport polymer to an anti-sense oligonucleotide can be effected, for example, by forming an amide linkage between the peptide and the 5 '-terminus of the oligonucleotide through a succinate linker, according to well-established methods.
- the use of PNA conjugates is further illustrated in Example 11 of PCT Application PCT/US98/10571.
- Figure 7 of that application shows results obtained with a conjugate of the invention containing a PNA sequence for inhibiting secretion of gamma- interferon ( ⁇ -IFN) by T cells, as detailed in Example 11.
- the anti-sense PNA conjugate was effective to block ⁇ -IFN secretion when the conjugate was present at levels above about 10 ⁇ M. In contrast, no inhibition was seen with the sense-PNA conjugate or the non-conjugated antisense PNA alone.
- Therapeutic proteins include, but are not limited to replacement enzymes.
- Therapeutic enzymes include, but are not limited to, alglucerase, for use in treating lysozomal glucocerebrosidase deficiency (Gaucher's disease), alpha-L-iduronidase, for use in treating mucopolysaccharidosis I, alpha-N-acetylglucosamidase, for use in treating sanflippo B syndrome, lipase, for use in treating pancreatic insufficiency, adenosine deaminase, for use in treating severe combined immunodeficiency syndrome, and triose phosphate isomerase, for use in treating neuromuscular dysfunction associated with triose phosphate isomerase deficiency.
- protein antigens may be delivered to the cytosolic compartment of antigen-presenting cells (APCs), where they are degraded into peptides.
- APCs antigen-presenting cells
- the peptides are then transported into the endoplasmic reticulum, where they associate with nascent HLA class I molecules and are displayed on the cell surface.
- APCs can serve as inducers of class I restricted antigen-specific cytotoxic T-lymphocytes (CTLs), which then proceed to recognize and destroy cells displaying the particular antigen.
- APCs that are able to carry out this process include, but are not limited to, certain macrophages, B cells and dendritic cells.
- the protein antigen is a tumor antigen for eliciting or promoting an immune response against tumor cells.
- the transport of isolated or soluble proteins into the cytosol of APC with subsequent activation of CTL is exceptional, since, with few exceptions, injection of isolated or soluble proteins does not result either in activation of APC or induction of CTLs.
- antigens that are conjugated to the transport enhancing compositions of the present invention may serve to stimulate a cellular immune response in vitro or in vivo.
- the invention is useful for delivering immunospecific antibodies or antibody fragments to the cytosol to interfere with deleterious biological processes such as microbial infection.
- intracellular antibodies can be effective antiviral agents in plant and mammalian cells (e.g., Tavladoraki et al. (1993) Nature 366:469; and Shaheen et al. (1996) J. Virol. 70:3392.
- scFv single-chain variable region fragments
- the variable heavy and light chains are usually separated by a flexible linker peptide (e.g.
- Peptides to be delivered by the enhanced transport methods described herein include, but should not be limited to, effector polypeptides, receptor fragments, and the like. Examples include peptides having phosphorylation sites used by proteins mediating intracellular signals. Examples of such proteins include, but are not limited to, protein kinase C, RAF-1, p21Ras, ⁇ F- ⁇ B, C-JUN, and cytoplasmic tails of membrane receptors such as IL-4 receptor, CD28, CTLA-4, V7, and MHC Class I and Class II antigens.
- the delivery-enhancing transporter is also a peptide
- synthesis can be achieved either using an automated peptide synthesizer or by recombinant methods in which a polynucleotide encoding a fusion peptide is produced, as mentioned above.
- Biotinylated peptides were synthesized using solid phase techniques and commercially available Fmoc amino acids, resins, and reagents (PE Biosystems, Foster City CA, and Bachem Torrence, CA) on a Applied Biosystems 433 peptide synthesizer. Fastmoc cycles were used with O-(7-azabenzotriazol-l-yl)-l, 1, 3, 3-tetramethyluronium hexfluorophosphate (HATU) substituted for HBTU/HOBt as the coupling reagent. Prior to the addition of biotin to the amino terminus of the peptide, amino caproic acid (aca) was conjugated and acted as a spacer.
- aca amino caproic acid
- the peptides were cleaved from the resin using 96% trifluoroacetic acid, 2% triisopropyl silane, and 2% phenol for between 1 and 12 hours. The longer reaction times were necessary to completely remove the Pbf protecting groups from the polymers of arginine.
- the peptides subsequently were filtered from the resin, precipitated using diethyl ether, purified using HPLC reverse phase columns (Alltech Altima, Chicago, IL.) and characterized using either electrospray or matrix assisted laser deso ⁇ tion mass spectrometry (Perceptive Biosystems, Boston, MA).
- PBS phosphate buffered saline
- Frozen sections (5 microns) were cut using a cryostat, collected on slides, and stained with fluorescently labeled streptavidin (Vector Laboratories, Burlingame, CA). The slides were fixed in acetone at 4°C for ten minutes, air dried, soaked in PBS for five minutes, blocked with normal goat serum for five minutes, and washed with PBS for five minutes. The section was stained by incubation with fluorescently labeled streptavidin at 30 ⁇ g/ml for thirty minutes, washed with PBS, counterstained with propidium iodide (1 ⁇ g/ml) for two minutes, and the section was mounted with VectashieldTM mounting media. Slides were analyzed by fluorescent microscopy.
- the cytosol and nuclei of all cells in the field were fluorescent, indicating penetration into virtually every cell of the nude mouse skin in the section.
- the staining pattern was consistent with unanticipated transport that was both follicular and interfollicular.
- positive cells were apparent in papillary and reticular dermis.
- no staining was apparent in mice treated with biotin alone, or phosphate buffered saline alone.
- biotinylated arginine heptamer crossed into and across the epidermis and into the dermis of the human skin.
- the cytosol and nuclei of all cells in the field were fluorescent, indicating penetration into and through the epidermis and dermis.
- Intense staining was seen at both 20X and 40X magnification. The staining pattern was consistent with unanticipated transport that was both follicular and interfollicular.
- positive cells were apparent in papillary and reticular dermis.
- VaselineTM The samples were allowed to penetrate for thirty, sixty, and 120 minutes. At the end of this period animal was sacrificed, the relevant section of skin was excised, embedded in mounting medium (OCT) and frozen. Frozen sections were cut using a cryostat, collected on slides, and stained with fluorescently labeled streptavidin (Vector Laboratories, Burlingame, CA) as described in Example 1. Slides were analyzed by fluorescent microscopy.
- Example 5 Penetration of cyclosporin conjugated to a biotinylated pentamer, heptamer, and nonamer of D-arginine into the skin of nude mice.
- Samples (lOO ⁇ l) were applied as a liquid within excipient and prevented from dispersing by a VaselineTM barrier and allowed to penetrate for thirty, sixty, and 120 minutes. At the end of this period animal was sacrificed, the relevant section of skin was excised, embedded in mounting medium (OCT) and frozen. Frozen sections were cut using a cryostat, collected on slides, and stained with fluorescently labeled streptavidin (Vector Laboratories, Burlingame, CA) as described in Example 1. Slides were analyzed by fluorescent microscopy Results
- Example 7 Demonstration that cyclosporin A -transporter conjugates enter T cells in the dermis
- biotinylated D-arginine heptamer-cyclosporin (r7 CsA) conjugate would reach infiltrating T cells within inflamed skin in vivo
- biotin r7 CsA was applied to the site of inflammation on the back of a mouse with experimentally induced contact dermatitis. Inflamed skin was stained with rhodamine labeled goat anti-mouse CD3 to localize T-cells and with fluorescein labeled streptavidin to localize the biotin r7 CsA.
- Biotin r7 CsA was found in all CD3[+] T cells in the tissue in addition to a variety of other cells that probably represent other inflammatory cells as well as resident fibroblasts. These data indicate that biotin r7 CsA penetrates inflamed skin to reach key target T lymphocytes.
- Cyclosporin A was conjugated to an oligo-arginine transporter through a pH sensitive linker as shown in Figure 10.
- the resultant conjugate is stable at acidic pH but at pH>7 it undergoes an intramolecular cyclization involving addition of the free amine to the carbonyl adjacent to Cyclosporin A ( Figure 6), which results in the release of unmodified Cyclosporin A.
- the releasable guanidino-heptamer conjugate of Cyclosporin A was shown to be biologically active by inhibiting IL-2 secretion by the human T cell line, Jurkat, stimulated with PMA and ionomycin in vitro. See R. Wiskocil, et al, J Immunol 134, 1599- 603 (1985). The conjugate was added 12 hours prior to the addition of PMA/ionomycin and dose dependent inhibition was observed by the releasable R7 CsA conjugate.
- the releasable R7 CsA conjugate was assayed in vivo for functional activity using a murine model of contact dermatitis.
- Treatment with the 1% releasable R7 CSA conjugate resulted in 73.9% ⁇ 4.0 reduction in ear inflammation (Figure 7).
- No reduction in inflammation was seen in the untreated ear, indicating that the effect seen in the treated ear was local and not systemic.
- Less inhibition was observed in the ears of mice treated with 0.1 and 0.01% R7-CsA (64.8% ⁇ 4.0 and 40.9% ⁇ 3.3 respectively), demonstrating that the effect was titratable.
- the Cu-DTPA was linked to a transporter through an aminocaproic acid spacer using a PE Applied Biosystems Peptide Synthesizer (ABI 433A) ( Figure 9).
- the material was cleaved from the resin by treatment with trifluoroacetic acid (TFA) (40 mL), triisopropyl silane (100 ⁇ L) and phenol (100 ⁇ L) for 18 h.
- TFA trifluoroacetic acid
- the resin was filtered off and the peptide was precipitated by addition of diethyl ether (80 mL).
- the solution was centrifuged and the solvent decanted off.
- the crude solid was purified by reverse-phase HPLC using a water/acetonitrile gradient. Treatment with TFA resulted in loss of Cu 2+ ion which needed to be reinserted.
- DTPA-aca-R7-CO2H 10 mg, 0.0063 mmol
- copper sulfate 1.6 mg, 0.0063 mmol
- Metal diethylenetriaminepentaacetic acid (DTPA) complexes were formed by mixing equimolar amounts of metal salts with DTPA in water for 18 hours. At the end of this time, the solutions were centrifuged, frozen and lyophilized. The dried powder was characterized by mass spectrometry and used in solid phase peptide synthesis.
- the metal- DTPA complexes were attached to polymers of D- or L-arginine that were still attached to solid-phase resin used in peptide synthesis.
- the metal-DTPA complexes were attached using an aminocaproic acid spacer.
- Example 2 The solid phase peptide synthesis techniques were described in Example 1, with the exception that cleavage of the peptide- DTPA -metal complex in trifluoroacetic acid released the metal. The metal is replaced after HPLC purification and lyophilization of the peptide- DTPA complex. Replacement of the metal involved incubation of equimolar amounts of the metal salt with the peptide-aminocaproic acid- DTPA complex and subsequent lyophilization.
- Varying concentrations (1 ⁇ M to 1 mM) of the Cu- DTPA -aca-r7 complex were applied to the abdominal region of nude mice for 15, 30 and 45 minutes. As controls, an equimolar amount of the Cu- DTPA complex was spotted onto the abdominal region. At the end of the incubation period, the samples were simply wiped off and intense blue color was apparent on the skin where the Cu- DTPA -aca-r7 complex was spotted and not where the Cu- DTPA alone was spotted. In the case of the application of 1 mM, visible blue dye was seen for three days, decreasing with time, but being apparent for the full period.
- Varying concentrations (1 ⁇ M to 1 mM) of the Gd- DTPA -aca-r7 complex are injected into the tail vein of BALB/c mice in 100 ⁇ l. Distribution of the Gd is observed in real time using magnetic resonance imaging. Distribution of the dye is apparent throughout the bloodstream, entering liver, spleen, kidney, and heart. When injected into the carotid artery of rabbits, the dye is seen to cross the blood brain barrier.
- Step 1- Acylation of hydrocortisone with chloroacetic anhydride.
- a solution of hydrocortisone (200 mg, 0.55 mmol) and chloroacetic anhydride (113 mg, 0.66 mmol) in pyridine (5 mL) was stirred at room temperature for 2 h ( Figure 10).
- the solvent was evaporated off and the crude product was chromatographed on silica using 50% hexanes/ethyl acetate as the eluent.
- Product isolated a whites solid (139 mg, 58%).
- Samples (lOO ⁇ l) were applied as a liquid within excipient and prevented from dispersing by a VaselineTM barrier and allowed to penetrate for thirty, sixty, and 120 minutes. At the end of this period animal was sacrificed, the relevant section of skin was excised, embedded in mounting medium (OCT) and frozen. Frozen sections were cut using a cryostat, collected on slides, and stained with fluorescently labeled streptavidin (Vector Laboratories, Burlingame, CA) as described in Example 1. Slides were analyzed by fluorescent microscopy.
- Taxol (48.7 mg, 57.1 ⁇ mol) was dissolved in CH 2 CI 2 (3.0 mL) under an N 2 - atmosphere. The solution was cooled to 0°C. A stock solution of the chloro formate of benzyl-( -hydroxy benzoate) (200 mmol, in 2.0 mL CH 2 CI 2 - freshly prepared from benzyl- (p-hydroxy benzoate) and diphosgene) was added at 0°C and stirring at that temperature was continued for 5 hours, after which the solution was warmed to room temperature (Figure 12). Stirring was continued for additional 10 hours.
- B-aca-r5-K-taxol 3.6 mg, 1.32 mmol, 20%.
- B-aca-r7-K-taxol 9.8 mg, 3.01 mmol, 44%.
- Samples (lOO ⁇ l) were applied as a liquid within excipient and prevented from dispersing by a VaselineTM barrier and allowed to penetrate for thirty, sixty, and 120 minutes. At the end of this period animal was sacrificed, the relevant section of skin was excised, embedded in mounting medium (OCT) and frozen. Frozen sections were cut using a cryostat, collected on slides, and stained with fluorescently labeled streptavidin (Vector Laboratories, Burlingame, C A) as described in Example 1. Slides were analyzed by fluorescent microscopy.
- This Example demonstrates the use of a general strategy for synthesizing prodmgs that have a delivery-enhancing transporter linked to a d g by a linker that releases the dmg from the delivery-enhancing transporter upon exposure to physiological pH.
- a suitable site on the dmg is derivatized to carry an ⁇ -chloroacetyl residue.
- the chlorine is displaced with the thiol of a cysteine residue that carries an unprotected amine. This scheme is shown in Figure 16.
- the peptide (47.6 mg, 22.4 ⁇ mol) was dissolved in DMF (1.0 mL) under an N 2 -atmosphere. DIEA (2.8 mg, 22.4 ⁇ mol) was added. A solution of taxol-2'-chloroacetate (20.8 mg, 22.4 ⁇ mol) in DMF (1.0 mL) was added. Stirring at room temperature was continued for 6 hours. Water containing 0.1% TFA (1.0 mL) was added, the sample was frozen and the solvents were lyophilized. The cmde material was purified by RP-HPLC (eluent: water/MeCN *0.1%TFA: 85% - 15%). A schematic of this reaction is shown in Figure 18.
- the taxol conjugates were tested for cytotoxicity in a 3-(4,5-dimethylthiazol- 2-yl)-2,5-diphenyl-tetrazolium-bromide (MTT) dye reduction.
- Rink amide resin and Boc 2 O were purchased from Novabiochem.
- Diisopropylcarbodiimide, bromoacetic acid, fluorescein isothiocyanate (FITC-NCS), ethylenediamine, 1,3-diaminopropane, 1 ,4-diaminobutane, 1 ,6-diaminohexane, trans-1,6- diaminocyclohexane, and pyrazole-1 -carboxamidine were all purchased from Aldrich®. All solvents and other reagents were purchased from commercial sources and used without further purification.
- the mono-Boc amines were synthesized from the commercially available diamines using a literature procedure (10 equiv. of diamine and 1 equiv. of Boc 2 O in chloroform followed by an aqueous work up to remove unreacted diamine) (34).
- N-tert-butoxycarbonyl-l,6-tr ⁇ «s-diaminocyclohexane.
- Tat 49-57 (RKKRRQRRR), tmncated and alanine-substituted peptides derived from Tat 9-57 , Antennapedia 43-58 (RQIKIWFQ ⁇ RRMKWKK), and homopolymers of arginine (R5-R9) and -arginine (r5-r9) were prepared with an automated peptide synthesizer (ABI433) using standard solid-phase Fmoc chemistry (35) with HATU as the peptide coupling reagent.
- ABI433 automated peptide synthesizer
- the fluorescein moiety was attached via a aminohexanoic acid spacer by treating a resin-bound peptide (1.0 mmol) with fluorescein isothiocyanate (1.0 mmol) and DIEA (5 mmol) in DMF (10 mL) for 12 h. Cleavage from the resin was achieved using 95:5 TFA/triisopropylsilane. Removal of the solvent in vacuo gave a cmde oil which was triturated with cold ether. The cmde mixture thus obtained was centrifuged, the ether was removed by decantation, and the resulting orange solid was purified by reverse-phase HPLC (H 2 O/CH 3 C ⁇ in 0.1 % TFA). The products were isolated by lyophilization and characterized by electrospray mass spectrometry. Purity of the peptides was >95% > as determined by analytical reverse-phase HPLC (H 2 O/CH 3 CN in 0.1% TFA).
- All peptides and peptoids synthesized contain an aminohexanoic (ahx) acid moiety attached to the N-terminal amino group with a fluorescein moiety (Fl) covalently linked to the amino group of the aminohexanoic acid spacer.
- ahx aminohexanoic
- Fl fluorescein moiety
- Jurkat cells human T cell line
- human PBL cells were grown in 10% fetal calf semm and DMEM and each of these were used for cellular uptake experiments.
- Varying amounts of arginine and oligomers of guanidine-substituted peptoids were added to approximately 3 x 10 6 cells in 2% FCS/PBS (combined total of 200 ⁇ L) and placed into microtiter plates (96 well) and incubated for varying amounts of time at 23 °C or 4 °C.
- the microtiter plates were centrifuged and the cells were isolated, washed with cold PBS (3 x 250 ⁇ L), incubated with 0.05% trypsin/0.53 mM EDTA at 37 °C for 5 min, washed with cold PBS, and resuspended in PBS containing 0.1 % propidium iodide.
- the cells were analyzed using fluorescent flow cytometry (FACScan, Becton Dickinson) and cells staining with propidium iodide were excluded from the analysis. The data presented is the mean fluorescent signal for the 5000 cells collected. Inhibition of Cellular Uptake with Sodium Azide. The assays were performed as previously described with the exception that the cells used were preincubated for 30 min with 0.5% sodium azide in 2% FCS/PBS buffer prior to the addition of fluorescent peptides and the cells were washed with 0.5% sodium azide in PBS buffer. All of the cellular uptake assays were n in parallel in the presence and absence of sodium azide. Cellular Uptake Kinetics Assay.
- the assays were performed as previously described except the cells were incubated for 0.5, 1, 2, and 4 min at 4 °C in triplicate in 2% FCS/PBS (50 ⁇ l) in microtiter plates (96 well). The reactions were quenched by diluting the samples into 2% FCS/PBS (5 mL). The assays were then worked up and analyzed by fluorescent flow cytometry as previously described.
- the peptide constmcts tested were Tat 49-57 (Fl-ahx-RKKRRQRRR): Tat 49-56 (Fl- ahx-RKKRRQRR), Tat 49-55 (Fl-ahx-RKKRRQR), Tat 50-57 (Fl-ahx-KKRRQRRR), and Tat 51- (Fl-ahx-KRRQRRR).
- Tat 49-57 Fl-ahx-RKKRRQRRR
- Tat 49-55 Fl-ahx-RKKRRQR
- Tat 50-57 Fl-ahx-KKRRQRRR
- Tat 51- Fl-ahx-KRRQRRR
- Tat 9 . 57 was compared to the /-arginine (R5-R9) and d- arginine (r5-r9) oligomers.
- Tat 49-57 contains eight cationic residues, its cellular intemalization was between that of R6 and R7 ( Figure 24) demonstrating that the presence of six arginine residues is the most important factor for cellular uptake.
- conjugates containing 7-9 arginine residues exhibited better uptake than Tat 49 . 5 .
- the desired peptoids were prepared using the "sub-monomer” approach (Simon et al.; Zuckermann et al.) to peptoids followed by attachment of a fluorescein moiety via an aminohexanoic acid spacer onto the amine termini. After cleavage from the solid- phase resin, the fluorescently labeled polyamine peptoids thus obtained were converted in good yields (60-70%) into polyguanidine peptoids by treatment with excess pyrazole-1 - carboxamidine (Bematowicz, et al, J. Org. Chem. 57:2497-2502 (1992) and sodium carbonate (as shown in Figure 25).
- N-arg5,7,9 The amount of fluorescence measured inside the cells with N-arg5,7,9 was proportional to the number of guanidine residues: N- arg9 > N-arg7 > N-arg5 ( Figure 26), analogous to that found for r5,7,9. Furthermore, the N- arg5,7,9 peptoids showed only a slightly lower amount of cellular entry compared to the corresponding peptides, r5,7,9.
- Example 15 The effect of side chain length on cellular uptake
- the relative order of uptake was N- hxg9 (6 methylene) > N-btg9 (4 methylene) > r9 (3 methylene) > N-arg9 (3 methylene) > N- etg9 (2 methylene) ( Figure 27).
- the ⁇ -hxg peptoids showed remarkably high cellular uptake, even greater than the corresponding d-arginine oligomers.
- the cellular uptake of the corresponding heptamers and pentamers also showed the same relative trend.
- the longer side chains embodied in the N-hxg peptoids improved the cellular uptake to such an extent that the amount of intemalization was comparable to the cooesponding d-arginine oligomer containing one more guanidine residue (Figure 28).
- the N-hxg7 peptoid showed comparable cellular uptake to r8.
- the nona-peptide, Tat 49-5 has been previously shown to efficiently translocate through plasma membranes.
- the goal of this research was to determine the structural basis for this effect and use this information to develop simpler and more effective molecular transporters.
- tmncated and alanine substituted derivatives of Tat 9-57 conjugated to a fluoroscein label was prepared. These derivatives exhibited greatly diminished cellular uptake compared to Tat 9-57 , indicating that all of the cationic residues of Tat 49-57 are required for efficient cellular uptake.
- these findings suggested that an oligomer of arginine might be superior to Tat 49-5 and certainly more easily and cost effectively prepared.
- This observation is consistent with molecular models of these peptoids, arginine oligomers, and Tat 49-57, all of which have a deeply embedded backbone and a guanidinium dominated surface.
- Molecular models further reveal that these stmctural characteristics are retained in varying degree in oligomers with different alkyl spacers between the peptoid backbone and guanidino head groups.
- N-hxg9 was superior to r9, the latter being 100-fold better than Tat 4 -57 .
- This result led us to prepare peptoid derivatives containing longer octyl spacers (N-ocg) between the guanidino groups and the backbone. Issues related to solubility prevented us from testing these compounds. Because both perguanidinylated peptides and perguanidinylated peptoids efficiently enter cells, the guanidine head group (independent of backbone) is apparently the critical stmctural determinant of cellular uptake.
- this investigation identified a series of stmctural characteristics including sequence length, amino acid composition, and chirality that influence the ability of Tat 4 - 7 to enter cells. These characteristics provided the blueprint for the design of a series of novel peptoids, of which 17 members were synthesized and assayed for cellular uptake. Significantly, the ⁇ -hxg9 transporter was found to be superior in cell uptake to r9 which was comparable to N-btg9. Hence, these peptoid transporters proved to be substantially better than Tat 9-57 .
- This Example provides one application of a general strategy for attaching a delivery-enhancing transporter to a compound that includes a triazole stmcture.
- the scheme using attachment of itraconazole to an arginine (r7) delivery-enhancing transporter as an example, is shown in Figure 30.
- R is H or alkyl
- n is 1 or 2
- X is a halogen.
- the reaction involves making use of quatemization of a nitrogen in the triazole ring to attach an acyl group that has a halogen (e.g., Br, Fl, I) or a methyl ester.
- a halogen e.g., Br, Fl, I
- Compound 3 was isolated by HPLC. Proton NMR in D 2 O revealed itraconazole and transporter peaks.
- the methyl ester provided yields of 70% and greater, while yields obtained using the Br-propionic acid/ester pair were 40-50%.
- the acyl derivative is then reacted with the amine of the delivery-enhancing transporter to form the conjugate.
- the halogenated acyl group can first be attached to the transporter molecule through an amide linkage, after which the reaction with the dmg compound is conducted.
- This Example describes the preparation of conjugates in which FK506 is attached to a delivery-enhancing transporter. Two different linkers were used, each of which released FK506 at physiological pH (pH 5.5 to 7.5), but had longer half-lives at more acidic pH. These schemes are diagrammed in Figures 31 A and B.
- Linker 1 6-maleimidocaproic hydrazide trifluroacetate (Scheme I and II)
- Linker 2 2-(2-pyridinyldithio) ethyl hydrazine carboxylate (Scheme III and IV)
- FK506 (1) (0. Ig, 124.4 ⁇ mol
- 2-(2-pyridinyldithio) ethyl hydrazine carboxylate (9) 0.091g, 373.2 ⁇ mol
- trifluoroacetic acid catalytic, l ⁇ L
- Gastrointestinal absorption protocol Experiments were performed on 8- to 10-week-old female Swiss Webster mice purchased from Taconic (Germantown, NY). Mice were anesthetized with Nembutal and a midline incision was made along the abdomen. Intestines were measured, tied off at both ends of the desired section with sutures, and biotinylated peptides were injected into the lumen (approximately lOO ⁇ /inch). After a fifteen minute incubation, the tissue was removed and the lumen was gently washed with PBS.
- mice were anesthetized with Nembutal, their heads tipped to one side and solutions of the biotinylated peptides were placed in their mouths. After fifteen minutes the liquid was removed by pipette.
- the anesthetized rodents were sacrificed by cervical dislocation and the tied off sections of the GI tract were removed.
- the lumens of the various sections were filled with OCT using a plastic tipped syringe, immersed in OCT filled boats, and snap frozen in a 2-methyl-butane/dry ice solution.
- Frozen sections were allowed to warm slightly and 2 mm thick sagital cuts were made using a steel razor blade. The cuts were placed into OCT molds and snap frozen in a 2-methyl-butane/dry ice solution. Sections (5 ⁇ m) were cut on the cryostat, fixed in acetone at 4°C for 10 minute, and allowed to air dry.
- Caco-2 cells were acquired from ATCC, thawed, and grown in DMEM containing penicillin, streptomycin, glutamine, and 10% fetal bovine semm for 3-5 days to
- the cells were seeded in lab-tek flaskette microscope slides ( ⁇ alge ⁇ unc Int., ⁇ aperville, IL) in 4 ml at a density of 60,000 cells/ml and grown for 21 days with the media being changed every other day.
- ⁇ alge ⁇ unc Int., ⁇ aperville, IL lab-tek flaskette microscope slides
- the monolayer was incubated with lOO ⁇ M Fl aca r9 CO ⁇ H2 for a five minutes.
- the monolayer was subsequently washed with PBS/2%) FBS twice to remove labeled peptide and analyzed using fluorescent microscopy.
- I2-I1 Current measurements were taken at five minute intervals, including 10 minutes prior to the addition of the test compounds to insure monolayers were intact. At zero time test compounds were added at the proper concentrations and measurements recorded. Measurements were taken for 60 minutes at 5 minute intervals; transepithelia electrical resistance (TEER) and short circuit current (Isc) were subsequently calculated from these values.
- TEER transepithelia electrical resistance
- Isc short circuit current
- CsA conjugate used in this study have been described previously (Rothbard et al. Nature Medicine 6, 1253 2000). See also, Figure 6. Briefly, CsA was conjugated to a heptamer of D-arginine through a pH sensitive linker as shown in Figure 6 A. The resultant conjugate is stable at acidic pH but at pH>7 it undergoes an intramolecular cyclization involving addition of the free amine to the carbonyl adjacent to CsA ( Figure 6B), which results in the release of unmodified CsA.
- Taxol was treated with ⁇ -chloro acetic anhydride delivering the C-2' chloro acetyl derivative 12 in essentially quantitative yield.
- the halogen was displaced by the thiol of the N-terminal (L) cysteine containing heptamer of D-arginine. Conjugations were performed at room temperature in DMF in the presence of DIEA. The final products were isolated by RP-HPLC and lyophilized to yield TFA salts, which were very hygroscopic and readily dissolve in water.
- Wistar rats Females of approximately 200-300g (Simonsen, Gilroy, CA), were anesthetized, their abdomens were shaved, midline incisions were made, and a one-half inch section of the ascending colon in each animal was tied off with sutures.
- Taxol and cyclosporin (5mg/kg) were injected as solutions in a 1 :1 v/v Cremophor EL:ethanol mixture, whereas equivalent molar amounts of the r7 conjugates were injected in PBS. In all cases, the volume injected was approximately 500 ⁇ . The colon was placed back into the cavity, and the incision was closed using sutures.
- Blood samples were taken from the tail vein at time zero (prior to dmg injection), and every thirty minutes for the duration of the experiment, which was empirically determined, with the exception of one animal that expired after ninety minutes. Clotting was inhibited by transferring the blood to glass tubes containing lOO ⁇ of 0.5% EDTA, and the blood was frozen.
- the 1220 species cooesponds to the cyclosporin A + ammonia, the 1203 is protonated cyclosporin, while 100 is a known fragment. Taxol was monitored by the two transitions from both 872 to 855 daltons and 872 to 110 daltons. The 872 species cooesponds to the ammonium adduct of taxol, the 855 is the protonated parent compound, whereas 110 is the predominant fragment seen in the second quadmpole.
- Short oligomers of D-arginine have been shown to cross rapidly and efficiently the plasma membrane of a large variety of cell lines grown in suspension. In addition, they have been shown to penetrate multiple layers of the skin when applied topically, multiple layers of endothelial and smooth muscle cells of veins and arteries when injected intravenously, and multiple cell layers of lung tissue when inhaled. To determine whether these compounds could enter the nonkeratinized epithelia of the gastrointestinal tract, sections of the small and large intestines of fasted mice were tied off and solutions of biotinylated nonamers of D-arginine, bio aca r9 CONH 2 , (lOO ⁇ M) were injected.
- the relevant section of tissue was dissected, frozen, sectioned, and stained with Streptavidin fluorescein to define the location of the biotinylated peptide, and propidium iodide to counterstain all the nuclei in the section.
- CONH 2 (50 ⁇ M) was incubated for five minutes with Caco-2 cells grown as a monolayer on a microscope slide, washed, and analyzed by fluorescent microscopy. Consistent with the flow cytometry analysis of the suspension cells, virtually every cell in the monolayer was fluorescent after five minutes.
- the ability of the peptides to rapidly enter Caco-2 cells was firmly established by placing a monolayer of Caco-2 cells as a membrane in a diffusion chamber and exposing it to fluorescent transporter dmg conjugates between taxol and oligomers of arginine of different length. Varying concentrations of the taxol conjugates (50-0.08 ⁇ M) were added to the apical side and exposed to the monolayer of Caco-2 cells for three minutes.
- releasable conjugates of cyclosporin A and taxol were injected intracolonically and the resulting blood levels of the released dmgs were measured by LC MS MS.
- the first experiment was designed to measure blood levels of CsA after intracolonic injection of 5 mg/kg of CsA in Cremophor EL:ethanol compared with an equimolar amount of a releasable r7 conjugate of CsA dissolved in phosphate buffered saline.
- blood levels rose to approximately 25 ng/ml of CsA after thirty minutes, and then rapidly fell off to levels close to baseline levels (Figure 36). No further data was obtained because after 90 minutes the animal died.
- an equimolar amount of CsA-r7 conjugate was injected, detectable levels of CsA in the blood were observed only after 3 hours ( Figure 36).
- the conjugates enter the columnar epithelia of the colon with greater efficiency and more rapidly than CsA injected in Cremophor, but were retained in the epithelial cells and did not cross the endothelial cells surrounding the capillaries until the conjugate hydrolyzed. Once released, the CsA freely diffused, or was actively transported, into the blood.
- taxol and two different r7 -taxol conjugates were injected into the colon and blood levels of the dmg were measured at thirty minute intervals.
- a significant discovery in the experiments described herein is the failure of the peptides to enter the epithelia of the duodenum. This represents the first example of the transporters not entering a cell type or tissue.
- the pattern of increasing uptake the further the tissue extended from the gastric pyloms was intriguing, most likely due to a gradient of an inhibitor, such as a negatively charged mucus.
- the failure to stain the upper regions of the small intestine was in stark contrast with the intense staining in the colon, leading to the speculation that transporters of the present invention could be used for selective delivery of therapeutics to the colon. Not only were all luminal surfaces of the colon highly fluorescent, but the staining pattern also revealed that the biotinylated compounds were able to penetrate multiple cell layers and reach vascularized regions of the tissue, suggesting that the transporters should enhance transport into the bloodstream.
- the ability of the peptides to enter and subsequently exit multiple layers of cells in the skin, the lungs, and the cardiovascular system is in marked contrast to their inability to exit from lymphocytes or Caco-2 cells.
- lymphocytes or Caco-2 cells lymphocytes or Caco-2 cells.
- one difference is the cells through which the peptides rapidly penetrate are connected by tight junctions and other membrane stmctures inherent in tissue architecture, whereas the individual cells in suspension and perhaps the side of the membrane of endothelial cells contacting the bloodstream lack these features. If stmctures such as tight or gap junctions modify the suoounding lipid to permit exit of the transporters, then they should be able to diffuse rapidly throughout a tissue, such as skin or the colon, but not be transported into the bloodstream.
- Buccal administration of taxol conjugates appeared to be less effective, with less than one eighth of the amount of taxol being observed in the circulation compared with intracolonic injection. Another difference was the rate of appearance of the unmodified dmg. When administered in the oral cavity, taxol appeared in the blood stream by the first time point, whereas in the colonic injection detectable amounts of taxol did not appear for several hours. Even though there was no difference between taxol and the r7- taxol conjugate in the appearance of taxol in the circulation in buccal administration, approximately twice as much material reached the circulation when the conjugated was used.
- This example illustrates the conjugation of cyclosporin to a transport moiety using a pH sensitive linking group (see Figures 6A and 9B).
- cyclosporin is converted to its ⁇ -chloroacetate ester using chloroacetic anhydride to provide 6i (see Figure 6).
- the ester 6i is then treated with benzylamine to provide 6ii.
- Reaction of the amine with Boc-protected iminodiacetic acid anhydride provides the acid 6iii which is then converted to an activated ester (6iv) with N- hydroxy succinimide.
- Coupling of 6iv with L- Arginine heptamer provides the BOC- protected conjugate 6v, which can be converted to conjugate 6vi by removal of the BOC protecting group according to established methods.
- Transport moieties having arginine groups separated by, for example, glycine, ⁇ -aminocaproic acid, or ⁇ -aminobutyric acid can be used in place of the arginine heptamer in this and in the following examples that show oligoarginine transport groups.
- This example illustrates the conjugation of acyclovir to a transport moiety.
- This example illustrates the conjugation of hydrocortisone to a transport moiety.
- This example illustrates the conjugation of taxol to a transport moiety.
- the halogen atom of the chloroacetate ester was displaced by the thiol of an N-terminal (L) cysteine containing heptamer of arginine.
- This example illustrates two methods of linking active agents to transport moieties. Illustration is provided for retinoic acid derivatives linked to poly-D-Arg derivatives but can be applied to linkages between other biological agents and the transport moieties of the present invention.
- FIG. 40 provides a schematic presentation of the reactions. As seen in Figure 40, condensation of either retinal with H 2 N-r 9 -CO 2 H » 10TFA in MeOH in the presence of 4 A molecular seives at room temperature for four hours results in the formation of a Schiff base-type linkage between the retinal aldehyde and the amino terminal group. Purification of the conjugate can be accomplished by filtering the molecular sieves and removing methanol under reduced pressure.
- This example illustrates the preparation of a conjugate between retinoic acid and r 7 -CONH 2 using the linking group
- preparation of the conjugate follows the scheme outlined in Figure 41.
- retinoic acid (41 ii) is first combined with the chloroacetate ester of 4- hydroxymethyl-2,6-dimethylphenol (41 i) to provide the conjugate shown as 41 iii.
- Combination of 41 i with retinoic acid in methylene chloride in the presence of dicyclohexylcarbodiimide and a catalytic amount of 4-dimethylaminopyridine provided the retinoid derivative 41iii in 52-57%) yield.
- Condensation of 41iii with H 2 NCys- r CONH 2 ⁇ 8TFA in the presence of diisopropylethylamine (DMF, room temperature, 2 h) provides the desired conjugated product 41iv.
- DMF diisopropylethylamine
- This example illustrates a method of linking active agents such as acyclovir to transport moieties. See, Figure 42.
- Acyclovir (1 eq) was dissolved in dry N, N-dimethylformamide under a nitrogen atmosphere. Chloroacetic anhydride (1 eq), pyridine (1 eq), and DMAP (0.25 eq) were added subsequently to the reaction with stirring. The reaction was permitted to stir at room temperature for an additional 4 hours. The reaction was halted by removal of the solvent under reduced pressure. The residue was dissolved in methylene chloride and washed with saturated aqueous ammonium chloride followed by saturated aqueous ammonium bicarbonate and brine. The organic layer was concentrated in vacuo and the residue purified by silica gel chromatography to provide the acyclovir chloroacetyl ester.
- This example illustrates a method of linking active agents such as acyclovir to transport moieties. See, Figure 43. Disphosgene (0.5 eq) was dissolve in dry methylene chloride and cooled to -
- the chloroformate was dissolved in dry methylene chloride under a nitrogen atmosphere.
- Mercaptoethanol (1 eq) was added to the reaction as a solution in dry methylene chloride.
- the reaction was allowed to stir for 10 hours under a nitrogen atmosphere.
- the solution was concentrated under reduced and placed under high vacuum for
- the carbonate (1 eq) was dissolved DMF/water. To the solution was added the activated peptide NPYs-CR*-CONH2* 8HC1 (1 eq) with rapid stirring. A bright yellow color developed immediately and the reaction was allowed to stir at room temperature for an additional 5 hours. The reaction was purified directly by RP-HPLC to provide the desired acyclovir conjugate.
- This example illustrates a method of linking active agents such as corticoid steroids to transport moieties. See, Figure 44.
- Prednisolone ⁇ -chloroester- To a solution of prednisolone (1.38 mmol), scandium triflate (0.83 mmol) and chloroacetic anhydride (4.14 mmol) in dry THF was added dimethylaminopyridine (4.14 mmol). The solution turned bright yellow upon addition of dimethylaminopyridine. After 30 minutes the solvent was evaporated off and the cmde material taken up into ethyl acetate (100 mL). The ethyl acetate layer was washed with 1.0 N HCl and brine. The organic phase was collected, dried (Na 2 SO 4 ) and evaporated to provide the product as a white solid.
- H 2 N-C(prednisolone)-r8-CONH 2 A solution of prednisolone ⁇ -chloroester (1 equivalent), H 2 N-C-r8-CONH 2 (1 equivalent) and diisopropylethylamine (1.2 equivalent) in dimethylformamide (1 mL) was stioed for 18 hours. The dimethylformamide was evaporated off. The cmde product purified by reverse-phase HPLC (22 mm x 250 mm C-l 8 column, a 5-10% CH 3 CN/H 2 O gradient with 0.1% trifluoroacetic acid, 214 and 254 nm UV detection) and lyophilized to provide the 9 TFA salt. The material was then subjected to ion exchange chromatography to provide prednisolone conjugate (9 HCl salt) as a tan solid.
Abstract
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EP1401473A2 (en) * | 2001-02-16 | 2004-03-31 | Cellgate Inc. | Transporters comprising spaced arginine moieties |
WO2005054279A1 (en) * | 2003-11-21 | 2005-06-16 | Orthogen Ag | Delivery peptides, their constructs with active agents and use |
US6969514B2 (en) | 2003-02-05 | 2005-11-29 | Soll David B | Method for treating elevated intraocular pressure, including glaucoma |
EP1625149A2 (en) * | 2003-05-01 | 2006-02-15 | Cornell Research Foundation, Inc. | Method and carrier complexes for delivering molecules to cells |
EP1656951A1 (en) * | 2004-11-12 | 2006-05-17 | Xigen S.A. | Conjugates with enhanced cell uptake activity |
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Also Published As
Publication number | Publication date |
---|---|
JP2004533414A (en) | 2004-11-04 |
US20070173436A1 (en) | 2007-07-26 |
WO2002067917A1 (en) | 2002-09-06 |
US20020127198A1 (en) | 2002-09-12 |
EP1372626A4 (en) | 2007-08-01 |
JP2004530657A (en) | 2004-10-07 |
EP1372626A1 (en) | 2004-01-02 |
US20040186045A1 (en) | 2004-09-23 |
CA2438784A1 (en) | 2002-09-06 |
EP1367995A1 (en) | 2003-12-10 |
MXPA03007590A (en) | 2003-12-04 |
MXPA03007591A (en) | 2003-12-04 |
US6669951B2 (en) | 2003-12-30 |
EP1367995A4 (en) | 2007-08-01 |
CA2438326A1 (en) | 2002-09-12 |
US20110206610A1 (en) | 2011-08-25 |
US20140213532A1 (en) | 2014-07-31 |
US8623833B2 (en) | 2014-01-07 |
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