Compositions for coating microcapsules and other surfaces
First Claim
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1. A pharmaceutically acceptable composition which reduces cellular adhesion to a surface to which the composition is applied comprising:
- a water soluble block copolymer comprising at least one polycationic polymer block grafted to at least one hydrophilic, water soluble, non-ionic polymer block, in combination with a polyanionic polymer which binds to the block copolymer such that the outerlayer of the composition is a hydrophilic and uncharged polymer layer.
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Abstract
Biocompatible microcapsules useful for transplanting foreign material into an animal body, and the method of their production, are described, wherein the microcapsules contain an outermost layer of water soluble non-ionic polymers such as PEO to create resistance to cell adhesion on the surface of the microcapsules.
66 Citations
24 Claims
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1. A pharmaceutically acceptable composition which reduces cellular adhesion to a surface to which the composition is applied comprising:
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a water soluble block copolymer comprising at least one polycationic polymer block grafted to at least one hydrophilic, water soluble, non-ionic polymer block, in combination with a polyanionic polymer which binds to the block copolymer such that the outerlayer of the composition is a hydrophilic and uncharged polymer layer. - View Dependent Claims (2, 3, 4, 7, 8, 9, 10)
a) a decrease of adherence to the surface of cells from an animal; and
b) a decrease of the immune response of an animal to the surface.
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10. The composition of claim 7 wherein the block copolymer comprises a positive charge.
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5. A pharmaceutically acceptable composition comprising:
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a water soluble block copolymer comprising at least one polycationic polymer block grafted to at least one hydrophilic, water soluble, non-ionic polymer block having a weight average molecular weight between 2000 and 100,000 daltons, in combination with a polyanionic polymer which binds to the block copolymer to form a hydrophilic, uncharged polymer layer. - View Dependent Claims (6)
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11. A composition suitable for treating a surface to improve its biocompatibility and resistance to cellular overgrowth, comprising:
an aqueous solution of a pharmaceutically acceptable water-soluble block copolymers, the block copolymer comprising a water-soluble non-ionic polymer and a polycationic polymer, in combination with a polyanionic polymer which binds to the block copolymer to form a hydrophilic, uncharted polymer layer effective to shield a surface from cellular adhesion. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for improving the biocompatibility of a microcapsule comprising a polyanionic polymer on its surface, comprising adding a composition comprising a pharmaceutically acceptable water-soluble block copolymer to an aqueous solution containing the microcapsule,
wherein the copolymer comprises a water-soluble non-ionic polymer grafted to a polycationic polymer, and binding the block copolymer to the microcapsule to form a non-ionic, hydrophilic outerlayer.
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19. A method for treating a surface comprising a polyanionic polymer to improve its biocompatibility and resistance to cellular overgrowth and protein adhesion comprising:
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attaching to the surface a water-soluble block copolymer comprising a water-soluble non-ionic polymer grafted to a polycationic polymer, and binding the water-soluble block copolymer to the polyanionic polymer surface to form a non-ionic, hydrophilic layer on the surface. - View Dependent Claims (20, 21, 22, 23, 24)
a) decrease, after treatment, of adherence to the surface of cells from an animal;
b) decrease, after treatment, of the immune response of an animal to the surface;
orc) decrease, after treatment, of overgrowth of the surface by cells from an animal.
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Specification