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The Journal of Immunology, Vol 142, Issue 9 3098-3103, Copyright © 1989 by American Association of Immunologists

ARTICLES

Stimulation of human synovial fibroblast DNA synthesis by platelet- derived growth factor and fibroblast growth factor. Differences to the activation by IL-1

DM Butler, T Leizer and JA Hamilton
Department of Medicine, University of Melbourne, Parkville, Australia.

The pronounced synovial hyperplasia often found in the joints of patients with rheumatoid arthritis could be explained partially by the action of monocyte-macrophage polypeptides (monokines). This report demonstrates that two cytokines which may be derived from monocyte- macrophage populations, namely platelet-derived growth factor (PDGF) and basic fibroblast growth factor (bFGF), stimulate the DNA synthesis and proliferation of human synovial fibroblast-like cells cultured in low (i.e., 1%) fetal bovine serum. Epidermal growth factor, insulin- like growth factor-I, insulin-like growth factor-II (multiplication stimulating activity) and substance P were inactive. Unlike IL-1, PDGF and FGF do not also stimulate PGE2, plasminogen activator, and hyaluronic acid levels. Thus PDGF and FGF, arising from stimulated monocyte-macrophages, may play a role in the stimulation of mesenchymal cell proliferation that often accompanies chronic inflammatory arthritic disease. The synovial cells respond to a variety of cytokines in different ways suggesting multiple-signaling pathways.


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