The British Journal of Rheumatology, Vol 36, 729-734, Copyright © 1997 by British Society for Rheumatology
FW Fawthrop, A Frazer, RG Russell and RA Bunning
Transforming growth factor beta (TGF beta) has previously been shown to
have actions on chondrocytes and cartilage both in vitro and in vivo which
suggest a role in connective tissue repair. In particular, some of its
actions have been shown to be antagonistic to those of interleukin 1
(IL-1). In this study, the effects of TGF beta on prostaglandin E (PGE)
production and caseinase activity, in the presence and absence of IL-1, in
human articular chondrocytes were investigated. TGF beta 1 and TGF beta 2
were shown to modulate IL-1 beta-stimulated PGE production and caseinase
activity. Both TGF beta 1 and beta 2 inhibited IL-1 beta-stimulated PGE
production in the absence of serum and augmented it in the presence of
serum. TGF beta 1 and TGF beta 2 inhibited IL-1-stimulated caseinase
activity with and without serum. In general, the TGF beta s had little or
no effect on basal PGE or caseinase levels. TGF beta s may be important
modulators of chondrocyte metabolism, their effects on PGE production may
depend on cytokine interactions; furthermore, their effects on caseinase
activity may help prevent cartilage breakdown.
ORIGINAL PAPERS
Effects of transforming growth factor beta on the production of prostaglandin E and caseinase activity of unstimulated and interleukin 1-stimulated human articular chondrocytes in culture
Department of Human Metabolism and Clinical Biochemistry, Sheffield University Medical School.
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