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The Journal of Immunology, Vol 154, Issue 11 6040-6047, Copyright © 1995 by American Association of Immunologists
ARTICLES |
EJ Battegay, EW Raines, T Colbert and R Ross
Department of Research, University Hospital, Basel, Switzerland.
TNF-alpha stimulates DNA synthesis and proliferation of cultured human fibroblasts. Maximal DNA synthesis in response to TNF-alpha occurs approximately 28 h after addition of TNF-alpha to quiescent fibroblasts, a delay of about 12 to 14 h as compared with DNA synthesis elicited by platelet-derived growth factor (PDGF). TNF-alpha induces PDGF A chain gene expression with a maximum at 4 h. DNA synthesis is abrogated in response to TNF-alpha by a goat anti-PDGF IgG but not by nonimmune goat IgG, suggesting induction of an autocrine PDGF-AA loop by TNF-alpha. The response to PDGF-AA requires the presence of PDGF receptor alpha-receptors. TNF-alpha does not significantly affect PDGF alpha-receptor mRNA or protein expression, nor does it alter the proliferative response to externally added PDGF-AA. In contrast, TNF- alpha reduces the levels of PDGF beta-receptor mRNA, protein expression, and cell proliferation in response to PDGF-BB. Thus, DNA synthesis in response to TNF-alpha depends upon autocrinely induced PDGF-AA. At the same time, TNF-alpha may alter the response to PDGF-BB from exogenous sources.
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