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. 1981 Feb;43(2):408–416.

Release of chondrocyte-stimulating factor by rabbit peritoneal macrophages.

K Phadke, S Nanda, P Marder, D G Carlson
PMCID: PMC1537298  PMID: 6895055

Abstract

Cultured rabbit peritoneal macrophages, after stimulation with lipopolysaccharides (LPS), produce a factor that induces normal rabbit articular cartilage cells (chondrocytes) to release collagenase and other neutral proteases in their culture medium. The release of the factor as well as the activation of chondrocytes can be significantly inhibited by paramethasone (10(-6) M). Rabbit peripheral blood monocytes produce this factor in smaller quantities. Activation with LPS does not enhance the release of factor any further by these cells. Lymphocytes have no direct effect on the chondrocytic protease synthesis. Furthermore, conditioned medium of activated lymphocytes failed to stimulate monocytes or macrophages in the absence of LPS. The macrophage medium exhibits mitogenic and phytohaemagglutinin-enhancing activity towards thymocytes of C3H/HeJ mice, but not against species-specific rabbit lymphocytes. The lymphocyte-activating factor, derived from a mouse macrophage cell line, P388D1 cells, or from other sources, was unable to stimulate chondrocytic protease secretion. Such specific induction of chondrocytic proteases by a macrophage-derived factor may have an important role in cartilage destruction in arthritic conditions, where synovium is only marginally involved.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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