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Last Updated: January 26, 2022

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Claims for Patent: 8,956,643

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Summary for Patent: 8,956,643
Title:Porous biodegradable polymer scaffolds for in situ tissue regeneration and method for the preparation thereof
Abstract: The present invention relates to an intelligent porous biodegradable polymer scaffold for in situ tissue regeneration in which two kinds of physiologically active substances having high differentiation potential and biocompatibility are introduced into the polymer scaffold and conjugated to the surface thereof, respectively, and a method for the preparation thereof. Since the intelligent porous biodegradable polymer scaffold exhibits improved biocompatibility and differentiation potential due to the introduction of physiologically active substances capable of efficiently inducing cell proliferation and differentiation into both the surface and the inside thereof, it can directly induce in situ tissue regeneration of the musculoskeletal system from stem cells in a living tissue after transplanting the polymer scaffold and stem cells into a human body without additional in vitro cultivation. Therefore, the intelligent porous biodegradable polymer scaffold according to the present invention can be effectively used in the regeneration of various kinds of tissues and organs including the musculoskeletal system.
Inventor(s): Han; Dong Keun (Seoul, KR), Park; Kwideok (Seoul, KR), Kim; Jae-Jin (Seoul, KR), Bae; Soon Eon (Seoul, KR)
Assignee: Korea Institute of Science and Technology (Seoul, KR)
Application Number:12/473,850
Patent Claims:1. An intelligent porous biodegradable polymer scaffold for in situ tissue regeneration of the musculoskeletal system comprising: a polymer scaffold having a surface modified with a carboxyl group-containing hydrophilic monomer; a first physiologically active substance introduced into the inside of the polymer scaffold, wherein the first physiologically active substance is selected from the group consisting of dexamethasone, .beta.-glycerophosphate, ascorbate-2-phosphate, ascorbate, demineralized bone matrix (DBM), hydroxyapatite (HAP), ascorbic acid, 1,25-dihydroxyvitamin D.sub.3, tricalcium phosphate (TCP), collagen, parathyroid hormone (PTH), PTH 1-34 peptide, and retinoic acid-sensitive protein (CD-RAP); and a second physiologically active substance conjugated to the surface of the polymer scaffold via heparin immobilized on the hydrophilic monomer, wherein the second physiologically active substance is selected from the group consisting of dexamethasone, .beta.-glycerophosphate, ascorbate-2-phosphate, ascorbate, demineralized bone matrix (DBM), hydroxyapatite (HAP), ascorbic acid, 1,25-dihydroxyvitamin D.sub.3, tricalcium phosphate (TCP), collagen, parathyroid hormone (PTH), PTH 1-34 peptide, and retinoic acid-sensitive protein (CD-RAP).

2. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the polymer scaffold is made from a biodegradable polymer which is selected from the group consisting of polyglycolic acid (PGA), polylactic acid (PLA), polylactic acid-glycolic acid copolymer (PLGA), poly-.epsilon.-caprolactone (PCL), polyamino acid, polyanhydride, polyorthoester, derivatives, copolymers and mixtures thereof.

3. The intelligent porous biodegradable polymer scaffold according to claim 2, wherein the biodegradable polymer has a weight average molecular weight of 5,000 to 2,000,000.

4. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the carboxyl group-containing hydrophilic monomer is graft-polymerized onto the surface of the polymer scaffold in a molar ratio of 100:1 to 500:1.

5. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first physiologically active substance is selected from the group consisting of dexamethasone, collagen, parathyroid hormone (PTH), PTH 1-34 peptide, and retinoic acid-sensitive protein (CD-RAP).

6. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the heparin is immobilized on the carboxyl group-containing hydrophilic monomer graft polymerized onto the surface of the polymer scaffold in a molar ratio of 100:1 to 500:1.

7. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the second physiologically active substance is selected from the group consisting of dexamethasone, collagen, parathyroid hormone (PTH), PTH 1-34 peptide, and retinoic acid-sensitive protein (CD-RAP).

8. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the second physiologically active substance is conjugated to the surface of the polymer scaffold in an amount of 0.01 to 50 n mol based on 1 g of the polymer scaffold.

9. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first physiologically active substance is different from the second physiologically active substance.

10. The intelligent porous biodegradable polymer scaffold according to claim 1, which has a pore size in the range of about 10 to about 500 .mu.m, a specific surface area per unit volume in the range of about 100 to about 500 cm.sup.3/g, and a porosity in the range of about 90 to about 98%.

11. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the selected first and second physiologically active substances are different from each other.

12. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the selected first and second physiologically active substances are the same.

13. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone, .beta.-glycerophosphate, ascorbate-2-phosphate, ascorbate, demineralized bone matrix (DBM), hydroxyapatite (HAP), ascorbic acid, 1,25-dihydroxyvitamin D.sub.3, and tricalcium phosphate (TCP).

14. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone, .beta.-glycerophosphate, ascorbate-2-phosphate, ascorbate, ascorbic acid, and 1,25-dihydroxyvitamin D.sub.3.

15. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone, .beta.-glycerophosphate, demineralized bone matrix (DBM), hydroxyapatite (HAP), tricalcium phosphate (TCP), collagen, parathyroid hormone (PTH), PTH 1-34 peptide, and retinoic acid-sensitive protein (CD-RAP).

16. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone, .beta.-glycerophosphate, demineralized bone matrix (DBM), hydroxyapatite (HAP), and collagen.

17. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone and collagen.

18. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone, parathyroid hormone (PTH), and PTH 1-34 peptide.

19. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone and retinoic acid-sensitive protein (CD-RAP).

20. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are independently selected from the group consisting of dexamethasone and demineralized bone matrix (DBM).

21. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are both dexamethasone.

22. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are both collagen.

23. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the first and second physiologically active substances are both retinoic acid-sensitive protein (CD-RAP).

24. The intelligent porous biodegradable polymer scaffold according to claim 1, wherein the carboxyl group-containing hydrophilic monomer is selected from the group consisting of acrylic acid methacrylic acid, maleic acid, itaconic acid, and aconitic acid.

25. An intelligent porous biodegradable polymer scaffold for in situ tissue regeneration of the musculoskeletal system comprising: a polymer scaffold having a surface modified with a carboxyl group-containing hydrophilic monomer; a first physiologically active substance introduced into the inside of the polymer scaffold, wherein the first physiologically active substance is dexamethasone; and a second physiologically active substance conjugated to the surface of the polymer scaffold via heparin immobilized on the hydrophilic monomer, wherein the second physiologically active substance is selected from the group consisting of dexamethasone, .beta.-glycerophosphate, ascorbate-2-phosphate, ascorbate, demineralized bone matrix (DBM), hydroxyapatite (HAP), ascorbic acid, 1,25-dihydroxyvitamin D.sub.3, tricalcium phosphate (TCP), collagen, parathyroid hormone (PTH), PTH 1-34 peptide, and retinoic acid-sensitive protein (CD-RAP).

26. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the polymer scaffold is made from a biodegradable polymer which is selected from the group consisting of polyglycolic acid (PGA), polylactic acid (PLA), polylactic acid-glycolic acid copolymer (PLGA), poly-.epsilon.-caprolactone (PCL), polyamino acid, polyanhydride, polyorthoester, derivatives, copolymers and mixtures thereof.

27. The intelligent porous biodegradable polymer scaffold according to claim 26, wherein the biodegradable polymer has a weight average molecular weight of 5,000 to 2,000,000.

28. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the carboxyl group-containing hydrophilic monomer is graft-polymerized onto the surface of the polymer scaffold in a molar ratio of 100:1 to 500:1.

29. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the carboxyl group-containing hydrophilic monomer is selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, itaconic acid, and aconitic acid.

30. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the second physiologically active substance is selected from the group consisting of dexamethasone, .beta.-glycerophosphate, ascorbate-2-phosphate, ascorbate, demineralized bone matrix (DBM), hydroxyapatite (HAP), ascorbic acid, 1,25-dihydroxyvitamin D.sub.3, and tricalcium phosphate (TCP).

31. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the second physiologically active substance is selected from the group consisting of dexamethasone, .beta.-glycerophosphate, ascorbate-2-phosphate, ascorbate, ascorbic acid, and 1,25-dihydroxyvitamin D.sub.3.

32. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the second physiologically active substance is selected from the group consisting of dexamethasone, .beta.-glycerophosphate, demineralized bone matrix (DBM), hydroxyapatite (HAP), tricalcium phosphate (TCP), collagen, parathyroid hormone (PTH), PTH 1-34 peptide, and retinoic acid-sensitive protein (CD-RAP).

33. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the second physiologically active substance is selected from the group consisting of dexamethasone, .beta.-glycerophosphate, demineralized bone matrix (DBM), hydroxyapatite (HAP), and collagen.

34. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the second physiologically active substance is collagen.

35. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the second physiologically active substances is selected from the group consisting of dexamethasone, parathyroid hormone (PTH), and PTH 1-34 peptide.

36. The intelligent porous biodegradable polymer scaffold according to claim 25, wherein the second physiologically active substances is selected from the group consisting of dexamethasone and retinoic acid-sensitive protein (CD-RAP).

37. The intelligent porous biodegradable polymer scaffold according to claim 25, which has a pore size in the range of about 10 to about 500 .mu.m, a specific surface area per unit volume in the range of about 100 to about 500 cm.sup.3/g, and a porosity in the range of about 90 to about 98%.

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