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. 1975 Nov;56(5):1181–1188. doi: 10.1172/JCI108195

Prostaglandin-stimulated bone resorption by rheumatoid synovia. A possible mechanism for bone destruction in rheumatoid arthritis.

D R Robinson, A H Tashjian Jr, L Levine
PMCID: PMC301982  PMID: 1184744

Abstract

Synovial tissue from patients with rheumatoid arthritis was maintained in organ culture for 3-14 days. Conditioned media from these synovial cultures contained bone resorption-stimulating activity, measured in vitro by using calcium release from mouse calvaria as the assay system. The synovial cultures also produce prostaglandin E2 (PGE2) as measured by serologic methods. The production of both the bone resorption-stimulating activity and PGE2 was inhibited by more than 90% by treatment of the synovial cultures with indomethacin (5 mug/ml). In contrast, treatment of the synovial cultures with colchicine (0.1 mug/ml) caused a marked and parallel increase in the concentration of both bone resorption-stimulating activity and PGE2 in the conditioned media. The bone resorption-stimulating activity was quantitatively extracted into diethyl ether. Within the limits of experimental error, all of the bone resorption-stimulating activity in medium was accounted for by its content of PGE2, itself a potent osteolytic factor. We conclude that the bone resorption-stimulating activity produced by rheumatoid synovia in culture is PGE2.

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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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