Biodegradable polymers for cell transplantation
First Claim
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1. a biodegradable, biocompatible polymer formed by polymerizing a morpholinedione, wherein the morpholinedione is a dimer of(i) an α
- -hydroxy acid of the formula R, R'"'"'--COH--CO--OH wherein R and R'"'"' are independently H or a linear or branched alkyl; and
(ii) an α
-amino acid of the formula R", R"'"'"'--CNH2 --CO--OH wherein R" and R"'"'"' are independently H or a linear or branched alkyl;
a protected primary or secondary amino group;
a protected ester;
a protected hydroxyl;
a protected sulfide;
a protected amide;
a protected guanidino;
or a protected imidazole.
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Abstract
Polymers more suitable for use in organ transplantation are formed by coupling biologically active moieties to the free amino groups of polymers formed by incorporation of α amino acids into polymers formed of alpha hydroxy acids such as lactic acids. In the preferred embodiment, the peptides are coupled to the free amino groups.
199 Citations
23 Claims
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1. a biodegradable, biocompatible polymer formed by polymerizing a morpholinedione, wherein the morpholinedione is a dimer of
(i) an α - -hydroxy acid of the formula R, R'"'"'--COH--CO--OH wherein R and R'"'"' are independently H or a linear or branched alkyl; and
(ii) an α
-amino acid of the formula R", R"'"'"'--CNH2 --CO--OH wherein R" and R"'"'"' are independently H or a linear or branched alkyl;
a protected primary or secondary amino group;
a protected ester;
a protected hydroxyl;
a protected sulfide;
a protected amide;
a protected guanidino;
or a protected imidazole. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11, 12, 20, 21, 22)
- -hydroxy acid of the formula R, R'"'"'--COH--CO--OH wherein R and R'"'"' are independently H or a linear or branched alkyl; and
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6. A process for making a biocompatible, biodegradable polymer comprising:
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(A) forming a morpholinedione by chemically coupling (i) an α
-amino acid of the formula R", R"'"'"'--CNH2 --CO--OH, wherein R" and R"'"'"' are independently H or a linear or branched alkyl;
a protected primary or secondary amino group;
a protected ester;
a protected hydroxyl;
a protected sulfide;
a protected amide;
a protected guanidino;
or a protected imidazole; and(ii) an α
-hydroxy acid of the formula R,R'"'"'--COH--CO--OH, wherein R and R'"'"' are independently H or a linear or branched alkyl; and(B) polymerizing the morpholinedione with a Lewis acid. - View Dependent Claims (7, 23)
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13. A method for implanting cells into an animal comprising
(A) forming a matrix of a biocompatible, biodegradable polymer formed by polymerizing a morpholinedione wherein the morpholinedione is a dimer of (i) an α - -hydroxy acid of the formula R,R'"'"'--COH--CO--OH, wherein R and R'"'"' are independently H or a linear or branched alkyl; and
(ii) an α
-amino acid of the formula R",R"'"'"'--CNH2 --CO--OH, wherein R" and R"'"'"' are independently H or a linear or branched alkyl;
a protected primary or secondary amino group;
a protected ester;
a protected hydroxyl;
a protected sulfide;
a protected amide;
a protected guanidino;
or a protected imidazole, and(B) seeding the matrix with cells. - View Dependent Claims (14, 15, 16, 17, 18, 19)
- -hydroxy acid of the formula R,R'"'"'--COH--CO--OH, wherein R and R'"'"' are independently H or a linear or branched alkyl; and
Specification