Type X collagen synthesis in human osteoarthritic cartilage. Indication of chondrocyte hypertrophy
- PMID: 1622419
- DOI: 10.1002/art.1780350715
Type X collagen synthesis in human osteoarthritic cartilage. Indication of chondrocyte hypertrophy
Abstract
Objective: To investigate the appearance of hypertrophic chondrocytes in osteoarthritic (OA) cartilage, using type X collagen as a specific marker.
Methods: The biosynthesis of type X collagen was examined by metabolic labeling of freshly isolated articular chondrocytes with 3H-proline, immunoprecipitation, and sodium dodecyl sulfate-polyacrylamide gel electrophoresis of the synthesized collagens. Extracellular deposition of types X and II collagen was analyzed immunohistochemically.
Results: Immunostaining revealed an irregular distribution of type X collagen, which was localized around chondrocyte clusters in fibrillated OA cartilage, but was absent from the noncalcified region of normal articular cartilage. Freshly isolated OA chondrocytes synthesized predominantly type X collagen, while control chondrocytes synthesized mostly type II collagen.
Conclusion: Our findings indicate focal premature chondrocyte differentiation to hypertrophic cells in OA cartilage.
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