CA2490007A1 - Biodegradable triblock copolymers, synthesis methods therefor, and hydrogels and biomaterials made there from - Google Patents

Biodegradable triblock copolymers, synthesis methods therefor, and hydrogels and biomaterials made there from Download PDF

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CA2490007A1
CA2490007A1 CA002490007A CA2490007A CA2490007A1 CA 2490007 A1 CA2490007 A1 CA 2490007A1 CA 002490007 A CA002490007 A CA 002490007A CA 2490007 A CA2490007 A CA 2490007A CA 2490007 A1 CA2490007 A1 CA 2490007A1
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poly
hydroxyalkanoate
hydroxybutyrate
copolymer
polymer
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CA2490007C (en
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Jun Li
Xu Li
Xiping Ni
Kam W. Leong
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Institute of Materials Research and Engineering
Omeros Corp
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
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    • A61K9/0012—Galenical forms characterised by the site of application
    • A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
    • A61K9/0024—Solid, semi-solid or solidifying implants, which are implanted or injected in body tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
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    • A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
    • A61K47/32—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. carbomers, poly(meth)acrylates, or polyvinyl pyrrolidone
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    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
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    • A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
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    • A61L27/54—Biologically active materials, e.g. therapeutic substances
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    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
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    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
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    • A—HUMAN NECESSITIES
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    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
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Abstract

A drug delivery system that includes a hydrogel formed from cyclodextrin and an amphiphilic copolymer that includes an A polymer block comprising a poly(alkylene oxide) and a B polymer block comprising a poly(hydroxyalkanoate), and a therapeutically effective amount of at least o ne therapeutic agent intimately contained within the hydrogel. In one preferred embodiment of the invention, the A polymer block 10 is poly(ethylene oxide) (PEO) and the B polymer block is poly[(R)-3-hydroxybutyrate] (PHB), and the copolymer is the triblock ABA copolymer PEO-PHB-PEO. A method of synthesizin g the amphiphilic triblock copolymer is also provided.

Claims (68)

1. A drug delivery system, comprising:
a hydrogel formed from cyclodextrin and an amphiphilic copolymer, wherein the copolymer includes an A polymer block comprising a poly(alkylene oxide) and a B
polymer block comprising a poly(hydroxyalkanoate); and a therapeutically effective amount of at least one therapeutic agent intimately contained within the hydrogel.
2. The system of Claim 1, further comprising a pharmaceutically acceptable aqueous base.
3. The system of Claim 1, wherein the drug delivery system is injectable.
4. The system of Claim 3, wherein the hydrogel is thixotropic.
5. The system of Claim 1, wherein the system provides sustained release of the at least one therapeutic agent for a period of at least one week following initiation of drug release.
6. The system of Claim 1, wherein the system provides sustained release of the at least one therapeutic agent for a period of at least two weeks following initiation of drug release.
7. The system of Claim 1, wherein the poly(alkylene oxide) is selected from the group consisting of polyethylene oxide), poly(tetramethylene oxide) and poly(tetrahydrofuran).
8. The system of Claim 7, wherein the poly(alkylene oxide) is polyethylene oxide).
9. The system of Claim 1, wherein the poly(hydroxyalkanoate) is selected from the group consisting of: poly[(R)-3-hydroxybutyrate]; poly[(R)-4-hydroxybutyrate];
poly[(R)-3-hydroxyvalerate]; poly[(R)-3-hydroxybutyrate]-co-Poly[(R)-3-hydroxyvalerate]; poly[(R)-3-hydroxyhexanoate]; Poly[(R)-3-hydroxyheptanoate];
enantiomers of each of such (R) enantiomers; racemic mixtures of such (S) and (R) enantiomers; and mixtures thereof.
10. The system of Claim 1, wherein the poly(hydroxyalkanoate) is selected from the group consisting of poly[(R)-3-hydroxybutyrate]; poly[(R)-4-hydroxybutyrate];
(S) enantiomers of each of such (R) enantiomers; racemic mixtures of such (S) and (R) enantiomers; and mixtures thereof.
11. The system of Claim 1, wherein the poly(hydroxyalkanoate) comprises poly[(R)-3-hydroxybutyrate].
12. The system of Claim 1, wherein the copolymer is an amphiphilic triblock copolymer including a B polymer block mid-segment and two A polymer block end segments.
13. The system of Claim 12, wherein the poly(hydroxyalkanoate) B block polymer is selected from the group consisting of poly[(R)-3-hydroxybutyrate];
poly[(R)-4-hydroxybutyrate]; poly[(R)-3-hydroxyvalerate]; poly[(R)-3-hydroxybutyrate]-co-Poly[(R)-3-hydroxyvalerate]; poly[(R)-3-hydroxyhexanoate]; Poly[(R)-3-hydroxyheptanoate]; (S) enantiomers of each of such (R) enantiomers; racemic mixtures of such (S) and (R) enantiomers; and mixtures thereof.
14. The system of Claim 12, wherein the poly(alkylene oxide) A block polymer is selected from the group consisting of polyethylene oxide), poly(tetramethylene oxide) and poly(tetrahydrofuran).
15. The system of Claim 14, wherein the poly(alkylene oxide) A block polymer is polyethylene oxide).
16. The system of Claim 15, wherein the poly(hydroxyalkanoate) B block polymer is selected from the group consisting of poly[(R)-3-hydroxybutyrate];
poly[(R)-4-hydroxybutyrate]; poly[(R)-3-hydroxyvalerate]; poly[(R)-3-hydroxybutyrate]-co-Poly[(R)-3-hydroxyvalerate]; poly[(R)-3-hydroxyhexanoate]; Poly[(R)-3-hydroxyheptanoate]; (S) enantiomers of each of such (R) enantiomers; racemic mixtures of such (S) and (R) enantiomers; and mixtures thereof.
17. The system of Claim 1, wherein the poly(alkylene oxide) A block polymer and the poly(hydroxyalkanoate) B block polymer each has a molecular weight of from 500 to 20,000.
18. The system of Claim 1, wherein the poly(alkylene oxide) A block polymer and the poly(hydroxyalkanoate) B block polymer each has a molecular weight of from 2,000 to 10,000.
19. The system of Claim 1, wherein the poly(hydroxyalkanoate) B block polymer has a molecular weight of from 3,000 to 2,500.
20. The system of Claim 1, wherein the cyclodextrin is included at a level of from 5% to 80% of the weight of the copolymer.
21. The system of Claim 1, wherein the cyclodextrin is included at a level of from 5% to 50% of the weight of the copolymer.
22. The system of Claim 1, wherein the hydrogel comprises an aqueous solution containing the copolymer at a level of from about 1% to about 80% by weight.
23. The system of Claim 1, wherein the hydrogel comprises an aqueous solution containing the copolymer at a level of from about 10% to about 40% by weight.
24. The system of Claim 1, further comprising a secondary polymer which complexes with and/or conjugates the therapeutic agent.
25. The system of Claim 24, wherein the secondary polymer is a polymer selected from the group consisting of polyesters, polyurethanes, polyamides, polyethers, polysaccharides, poly(amino acids, polypeptides, and proteins.
26. The system of Claim 24, wherein the secondary polymer is a di- or mono-functional polymer with polyethylene glycol) segments.
27. The system of Claim 1, further comprising DNA nanospheres.
28. The system of Claim 1, wherein the copolymer has a molecular weight of between 1,000 and 50,000.
29. The system of Claim 1, wherein the copolymer has a molecular weight of between 5,000 and 35,000.
30. The system of Claim 1, wherein the at least one therapeutic agent is selected from the group consisting of peptides, proteins, small molecules, genes, antigens, antibodies and fragments thereof and human recombinant proteins, DNA, RNA and DNA
nanoparticles.
31. The system of Claim 1, wherein the at least one therapeutic agent is in a macromolecular form.
32. The system of Claim 1, wherein the at least one therapeutic agent is selected from the group consisting of analgesics, anesthetics, anti-arthritic drugs, disease modifying anti-rheumatic drugs, anti-asthma drugs, anticoagulants, anticonvulsants, antidepressants, antidiabetics, antineoplastics, antipsychotics, antihypertensives, antibiotics, antihistamines, decongestants, anti-inflammatories, muscle relaxants, anti-parasitic drugs, antiviral drugs, anti-restenotic agents, anti-spasm agents, chondroprotective agents, anti-adhesion agents, anti-tumor cell invasion agents, vasorelaxants, vasoconstrictors and immunosupressants.
33. The system of Claim 1, wherein the at least one therapeutic agent is selected from the group consisting of peptides, proteins including cytokines, growth factors, angiogenesis factors, soluble receptors, antibodies and fragments thereof and human recombinant proteins, small molecules, genes, antigens including vaccines, DNA, RNA and DNA nanoparticles.
34. The system of Claim 1, wherein the hydrogel is applied to an implantable device.
35. The system of Claim 34, wherein the implantable device is selected from the group consisting of stems, catheters, airway tubes, conduits, screws, plates, shunts, artificial joints, artificial hearts, artificial valves and other prostheses.
36. A drug delivery system, comprising:
a hydrogel formed from cyclodextrin and an amphiphilic copolymer, wherein the copolymer includes an A polymer block comprising poly(ethylene oxide) and a B
polymer block comprising poly(hydroxybutyrate); and a therapeutically effective amount of at least one therapeutic agent intimately contained within the hydrogel.
37. A hydrogel comprising cyclodextrin and an amphiphilic copolymer, wherein the copolymer includes an A polymer block comprising a poly(alkylene oxide) and a B polymer block comprising a poly(hydroxyalkanoate).
38. A process for synthesizing an amphiphilic ABA triblock copolymer, including poly(ethylene oxide) as an A block polymer and poly(3-hydroxyalkanoate) as a B block polymer, the process comprising:
converting poly(3-hydroxyalkanoate) into telechelic poly(3-hydroxyalkanoate)-diol with a lower molecular weight;

producing methoxy-poly(ethylene oxide)-monocarboxylic acid from methoxy-poly(ethylene oxide); and coupling the poly(3-hydroxyalkanoate)-diol with the methoxy-poly(ethylene oxide)-monocarboxylic acid using 1,3-dicyclohexylcarbodiimide to yield the ABA
triblock copolymer.
39. The process of Claim 38, wherein the poly(3-hydroxyalkanoate) is poly(3-hydroxybutyrate) and the poly(3-hydroxyalkanoate)-diol is poly(3-hydroxybutyrate)-diol.
40. The process of Claim 38, wherein the poly(3-hydroxyalkanoate) is converted into telechelic poly(3-hydroxyalkanoate)-diol by a transesterification reaction with ethylene glycol.
41. The process of Claim 38, wherein the methoxy-poly(ethylene oxide)-monocarboxylic acid is produced by reacting methoxy-poly(ethylene oxide) with succinic anhydride in the presence of 4-(dimethylamino)pyridine and triethylamine in 1,4-dioxane.
42. The process of Claim 38, wherein the poly(3-hydroxyalkanoate)-diol and the methoxy-poly(ethylene oxide)-monocarboxylic acid are dried prior to coupling.
43. The process of Claim 38, wherein the poly(3-hydroxyalkanoate)-diol and the methoxy-poly(ethylene oxide)-monocarboxylic acid are coupled in dried methylene chloride.
44. The process of Claim 43, wherein the poly(3-hydroxyalkanoate)-diol and the methoxy-poly(ethylene oxide)-monocarboxylic acid are coupled in dried methylene chloride under a nitrogen atmosphere.
45. The process of Claim 38, wherein the poly(3-hydroxyalkanoate)-diol and the methoxy-poly(ethylene oxide)-monocarboxylic acid are coupled with an excess of the methoxy-poly(ethylene oxide)-monocarboxylic acid.
46. The process of Claim 38, further comprising isolating the ABA triblock copolymer using mixed solvents selected from the group consisting of methanol/diethyl ether and chloroform/diethyl ether.
47. A drug delivery system, comprising:
micelles formed from an amphiphilic ABA copolymer, wherein the copolymer includes A polymer blocks comprising a poly(alkylene oxide) and a B polymer block comprising a poly(hydroxyalkanoate) selected from the group consisting of poly[(R)-3-hydroxybutyrate], poly[(R)-4-hydroxybutyrate], (S) enantiomers of each of such (R) enantiomers, racemic mixtures of such (S) and (R) enantiomers, and mixtures thereof; and a therapeutically effective amount of at least one therapeutic agent intimately contained within the micelles.
48. The system of Claim 47, further comprising a pharmaceutically acceptable aqueous base.
49. The system of Claim 48, wherein the micelles are in sufficient concentration in the aqueous base to form a hydrogel.
50. The system of Claim 49, wherein the hydrogel is applied to an implantable device.
51. The system of Claim 50, wherein the implantable device is selected from the group consisting of stems, catheters, airway tubes, conduits, screws, plates, shunts, artificial joints, artificial hearts, artificial valves and other prostheses.
52. The system of Claim 47, wherein the system provides sustained release of the at least one therapeutic agent for a period of at least approximately one week following initiation of drug release.
53. The system of Claim 47, wherein the poly(alkylene oxide) is selected from the group consisting of poly(ethylene oxide), poly(tetramethylene oxide) and poly(tetrahydrofuran).
54. The system of Claim 53, wherein the poly(alkylene oxide) is poly(ethylene oxide).
55. The system of Claim 54, wherein the poly(hydroxyalkanoate) comprises poly[(R)-3-hydroxybutyrate].
56. The system of Claim 47, wherein the poly(hydroxyalkanoate) comprises poly[(R)-3-hydroxybutyrate].
57. The system of Claim 47, wherein the poly(alkylene oxide) A block polymer and the poly(hydroxyalkanoate) B block polymer each has a molecular weight of from 500 to 20,000.
58. The system of Claim 47, wherein the poly(alkylene oxide) A block polymer and the poly(hydroxyalkanoate) B block polymer each has a molecular weight of from 2,000 to 10,000.
59. The system of Claim 47, wherein the poly(hydroxyalkanoate) B block polymer has a molecular weight of from 3,000 to 2,500.
60. The system of Claim 47, further comprising a secondary polymer which complexes with and/or conjugates the therapeutic agent.
61. The system of Claim 47, wherein the micelles form nanoparticles or microparticles encapsulating the at least one therapeutic agent.
62. The system of Claim 47, wherein the copolymer has a molecular weight of between 1,000 and 50,000.
63. The system of Claim 47, wherein the copolymer has a molecular weight of between 5,000 and 35,000.
64. The system of Claim 47, wherein the at least one therapeutic agent is selected from the group consisting of peptides, proteins, small molecules, genes, antigens, antibodies and fragments thereof and human recombinant proteins, DNA, RNA and DNA
nanoparticles.
65. The system of Claim 47, wherein the at least one therapeutic agent is in a macromolecular form.
66. The system of Claim 47, wherein the at least one therapeutic agent is selected from the group consisting of analgesics, anesthetics, anti-arthritic drugs, disease modifying anti-rheumatic drugs, anti-asthma drugs, anticoagulants, anticonvulsants, antidepressants, antidiabetics, antineoplastics, antipsychotics, antihypertensives, antibiotics, antihistamines, decongestants, anti-inflammatories, muscle relaxants, anti-parasitic drugs, antiviral drugs, anti-restenotic agents, anti-spasm agents, chondroprotective agents, anti-adhesion agents, anti-tumor cell invasion agents, vasorelaxants, vasoconstrictors and immunosupressants.
67. The system of Claim 47, wherein the at least one therapeutic agent is selected from the group consisting of peptides, proteins including cytokines, growth factors, angiogenesis factors, soluble receptors, antibodies and fragments thereof and human recombinant proteins, small molecules, genes, antigens including vaccines, DNA, RNA and DNA nanoparticles.
68. The system of Claim 47, wherein the micelles are substantially stable within a temperature range of 15 degrees C to 45 degrees C.
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