Polymers containing polysaccharides such as alginates or modified alginates
First Claim
1. A modified alginate, which comprises at least one alginate chain section to which is bonded by covalent bonding at least one cell attachment peptide or RGD peptide which promotes cell adhesion and growth.
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Abstract
Materials which contain polysaccharide chains, particularly alginate or modified alginate chains. The polysaccharide chains may be included as side chains or auxiliary chains from a backbone polymer chain, which may also be a polysaccharide. Further, the polysaccharide chains may be cross-linked between side chains, auxiliary chains and/or backbone chains. These materials and non-modified or otherwise modified alginate materials are advantageously modified by covalent bonding thereto of a biologically active molecule for cell adhesion or other cellular interaction. Processes for preparation of these alginate materials and methods for using them, particularly for cell transplantation and tissue engineering applications.
144 Citations
53 Claims
- 1. A modified alginate, which comprises at least one alginate chain section to which is bonded by covalent bonding at least one cell attachment peptide or RGD peptide which promotes cell adhesion and growth.
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13. An injectable solution for forming cell transplantation matrices comprising a modified alginate, which comprises at least one alginate chain section to which is bonded by covalent bonding at least one molecule useful for cell adhesion and growth, and viable cells for said transplantation.
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14. A transplantation matrix comprising a hydrogel of a modified alginate, which comprises at least one alginate chain section to which is bonded by covalent bonding at least one molecule useful for cell adhesion and growth, and viable cells for said transplantation.
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15. A method for cell transplantation comprising administering a mixture of a modified alginate, which comprises at least one alginate chain section to which is bonded by covalent bonding at least one molecule useful for cell adhesion and growth, and cells for transplantation.
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16. A polymer comprising,
(a) a polymeric backbone section, (b) a side chain comprising polymerized D-mannuronate monomers, L-guluronate monomers or both D-mannuronate and L-guluronate monomers bonded to said backbone, optionally through a linker, and (c) a biologically active molecule useful for cell adhesion and growth covalently bonded to the side chain.
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32. A polymer comprising,
(a) a polymeric backbone section, and (b) an alginate side chain, with uronic acid units having carboxylic acid groups, comprising polymerized D-mannuronate monomers, L-guluronate monomers or both D-mannuronate and L-guluronate monomers bonded to said backbone, optionally through a linker, wherein the polymer comprises multiple side chains wherein at least two of said side chains are crosslinked, the crosslinking being with a polyfunctional crosslinking agent having at least two nitrogen-containing functional groups which covalently bond to the carboxylic acid groups in the uronic acid units of the alginate side chains.
- 33. An alginate material comprising alginate chains with covalently bonded crosslinking between chains, the crosslinking being with a polyfunctional crosslinking agent having at least two nitrogen-containing functional groups which covalently bond to carboxylic acid groups in uronic acid units of the alginate chains.
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52. A polymer comprising,
(a) a polymeric backbone section of a poly(vinyl alcohol), poly(ethylene oxide), polypeptide, poly(amino acid) or poly(uronic acid) polymer, (b) alginate side chains, with uronic acid units having carboxylic acid groups, comprising polymerized D-mannuronate monomers, L-guluronate monomers or both D-mannuronate and L-guluronate monomers bonded to said backbone, optionally through a linker, and (c) at least one biologically active molecule bonded through a uronic acid unit on an alginate side chain.
Specification