Abstract
The presence of thrombospondin in extracts of ligament, meniscus and human nucleus pulposus was demonstrated by Western blot analysis using an anti-human thrombospondin antibody. Metabolic labeling of ligament fibroblast and meniscal fibrochondrocyte cultures followed by immunoprecipitation with anti-human thrombospondin revealed a single band corresponding to the molecular weight of thrombospondin when analyzed by SDS-PAGE and fluorography under reduced and non-reduced conditions. Thrombospondin, therefore, is a matrix constituent of ligament, knee joint meniscus and the nucleus pulposus and is synthesized by ligament fibroblasts and meniscal fibrochondrocytes in vitro.
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