Non-fibrogenic high mannuronate alginate coated transplants, processes for their manufacture, and methods for their use
First Claim
1. A viable, physiologically active and acceptable tissue transplant suitable for long-term transplantation,wherein said transplant is protected from destruction by the host immune system by coating said transplant essentially with a purified non-fibrogenic and non-toxic alkaline earth metal alginate selected from the group consisting of calcium alginate, magnesium alginate and a mixture thereof;
- wherein said alkaline earth metal alginate is substantially free from fucose, sulfate, phlorogluoinol or protein moieties;
wherein said alkaline earth metal alginate provides a barrier having a thickness between about 20 μ
m and about 200 μ
m providing a prolonged protection of said transplant from destruction of said transplant by the host immune system;
wherein said barrier is permeable enough to allow diffusion and release of proteins having an intermediate size from the transplant into the host body.
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Accused Products
Abstract
A transplant comprising a core of a viable, physiologically active cells coated with a non-fibrogenic alkaline earth metal alginate free from fibrogenic amounts of fucose, sulfate, phloroglucinol and protein moieties, having a mannuronate to guluronate molar ratio of from 1.2 to 6. The coating protects the core from host immunological destruction after transplantation. The coating is sufficiently permeable to permit the diffusion of nutrients and cell products through the coating.
A process for coating the transplant core comprising coating the core with alginate substantially free from fibrogenic compounds and reacting the alginate coating with alkaline earth metal cations comprising calcium ions or magnesium ions or mixture thereof to form an alkaline earth metal alginate coating.
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Citations
28 Claims
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1. A viable, physiologically active and acceptable tissue transplant suitable for long-term transplantation,
wherein said transplant is protected from destruction by the host immune system by coating said transplant essentially with a purified non-fibrogenic and non-toxic alkaline earth metal alginate selected from the group consisting of calcium alginate, magnesium alginate and a mixture thereof; -
wherein said alkaline earth metal alginate is substantially free from fucose, sulfate, phlorogluoinol or protein moieties; wherein said alkaline earth metal alginate provides a barrier having a thickness between about 20 μ
m and about 200 μ
m providing a prolonged protection of said transplant from destruction of said transplant by the host immune system;wherein said barrier is permeable enough to allow diffusion and release of proteins having an intermediate size from the transplant into the host body. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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2. A viable, physiologically active and acceptable pancreatic islet transplant suitable for long-term transplantation,
wherein said transplant is protected from destruction by the host immune system by coating said transplant essentially with a purified non-fibrogenic and non-toxic alkaline earth metal alginate selected from the group consisting of calcium alginate, magnesium alginate and a mixture thereof; -
wherein said alkaline earth metal alginate is substantially free from fucose, sulfate, phloroglucinol or protein moieties; wherein said alkaline earth metal alginate provides a barrier having a thickness between about 20 μ
m and about 200 μ
m providing a prolonged protection of said transplant from destruction by the host immune system;wherein said barrier is permeable enough to allow diffusion and release of pancreatic hormones from the transplant into the host body. - View Dependent Claims (3, 4, 5, 6, 7)
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16. A process of making a non-fibrogenic, coated core of transplant material suitable for transplantation from a donor to a host comprising:
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a) coating the transplant material with an alginate which is free from fibrogenic concentrations of fucose, sulfate, phloroglucinol and protein moieties, and b) reacting the alginate coating with alkaline earth metal cations to form an alkaline earth metal alginate coating. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification