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Protection from Interleukin 1 Induced Destruction of Articular Cartilage by Transforming Growth Factor Beta: Studies in Anatomically Intact Cartilage in Vitro and in Vivo

Overview
Journal Ann Rheum Dis
Specialty Rheumatology
Date 1993 Mar 1
PMID 8484670
Citations 24
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Abstract

The modulation of interleukin 1 (IL-1) effects on proteoglycan metabolism in intact murine patellar cartilage by transforming growth factor beta (TGF-beta) was investigated in vitro and in vivo. In vitro TGF-beta (400 pmol/l) had no effect on basal proteoglycan degradation. Proteoglycan degradation induced by IL-1, however, was suppressed by TGF-beta in serum free medium alone and in medium supplemented with 0.5 micrograms/ml insulin-like growth factor 1. This suggests a specific regulatory role for TGF-beta under pathological conditions. In contrast with the suppression of breakdown, synthesis of proteoglycans was stimulated by TGF-beta for both basal and IL-1 suppressed proteoglycan synthesis in cultures without insulin-like growth factor. In the presence of insulin-like growth factor no extra effect of TGF-beta on proteoglycan synthesis was observed. With insulin-like growth factor, however, TGF-beta potentiated the ex vivo recovery of IL-1 induced suppression of proteoglycan synthesis. Analogous to the in vitro effects, TGF-beta injected intraarticularly suppressed IL-1 induced proteoglycan degradation. Furthermore, TGF-beta injected into the joint counteracted IL-1 induced suppression of proteoglycan synthesis. This indicates that in vivo also TGF-beta can ameliorate the deleterious effects of IL-1 on the cartilage matrix.

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