Methods and compositions for the repair of articular cartilage defects in mammals
First Claim
1. A method for preparing a multi cell layered synthetic cartilage patch, the method comprising the steps of:
- (a) proliferating denuded chondrogenic cells in vitro, wherein said cells are undifferentiated;
(b) seeding said cells into a pre-shaped well having a cell contacting surface which prevents attachment of the cells; and
(c) culturing said cells for a time sufficient for said cells to differentiate and form a multi cell-layered synthetic cartilage and to endogenously produce an extracellular matrix.
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Abstract
Provided are methods and compositions for the repair of articular cartilage defects in a mammal. Denuded chondrogenic cells are proliferated ex vivo as monolayer cultures in order to expand the pool of available chondrogenic cells. During proliferation the chondrogenic cells stop secreting the extracellular matrix components, type II collagen and sulfated proteoglycans. The proliferated cells then are seeded into a pre-shaped well having a cell contacting, cell abhesive surface. The cells cultured in the well redifferentiate and begin to secrete cartilage-specific extracellular matrix again. Accordingly, essentially unlimited amounts of synthetic cartilage may be prepared from small samples of biopsy tissue. Also provided are methods for surgically repairing articular cartilage defects in mammals using the synthetic cartilage prepared in accordance with the invention.
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Citations
26 Claims
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1. A method for preparing a multi cell layered synthetic cartilage patch, the method comprising the steps of:
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(a) proliferating denuded chondrogenic cells in vitro, wherein said cells are undifferentiated; (b) seeding said cells into a pre-shaped well having a cell contacting surface which prevents attachment of the cells; and (c) culturing said cells for a time sufficient for said cells to differentiate and form a multi cell-layered synthetic cartilage and to endogenously produce an extracellular matrix. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 21, 25)
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2. A method for preparing a multi cell-layered synthetic cartilage, the method comprising the steps of:
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(a) providing a tissue comprising interconnected chondrogenic cells; (b) disaggregating said tissue to release denuded chondrogenic cells; (c) proliferating said denuded chondrogenic cell in vitro, wherein said cells are undifferentiated; (d) seeding said cells into a pre-shaped well having a cell contacting surface which prevents attachment of the cells; and (e) culturing said cells for a time sufficient for said cells to differentiate and form a multi cell-layered synthetic cartilage and to endogenously produce an extracellular matrix. - View Dependent Claims (17, 22)
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3. A method for preparing a multi cell-layered synthetic cartilage patch of pre-determined volume, the method comprising the steps of:
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(a) proliferating denuded chondrogenic cells in vitro, wherein said cells are undifferentiated; (b) seeding denuded chondrogenic cells into a pre-shaped well, said well having a cell contacting surface which prevents attachment of the cells and being dimensioned to determine the volume of the resulting synthetic cartilage patch; and (c) culturing said cells for a time sufficient for said cells to differentiate and form a multi cell-layered synthetic cartilage and to endogenously produce an extracellular matrix of pre-determined volume. - View Dependent Claims (18, 23)
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4. A method for preparing a multi cell-layered synthetic cartilage patch of pre-determined volume, the method comprising the steps of:
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(a) providing a tissue comprising interconnected chondrogenic cells; (b) disaggregating said tissue to release denuded chrondrogenic cells; (c) proliferating said denuded cells in vitro, wherein said cells are undifferentiated; (d) seeding said cells into a pre-shaped well, said well having a cell contacting surface which prevents attachment of the cells and being dimensioned to determine the volume of the resulting synthetic cartilage; and (e) culturing said cells for a time sufficient for said cells to differentiate and form a multi cell-layered synthetic cartilage and to endogeneously produce an extracellular matrix of pre-determined volume. - View Dependent Claims (19, 24)
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26. A multi cell-layered synthetic articular cartilage patch comprising:
chondrogenic cells dispersed within an endogenously produced extracellular matrix, wherein said synthetic articular cartilage is prepared by proliferating denuded chondrogenic cells in vitro, wherein said cells are undifferentiated, seeding chondrogenic cells into a pre-shaped well having a cell contacting surface which prevents attachment of the cells, and culturing said cells in said well for a time sufficient to differentiate and induce formation of synthetic articular cartilage for repairing the cartilage defect in said mammal.
Specification