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This study examines the possible involvement of endogenous platelet-derived growth factor (PDGF) in the angiotensin II-induced growth of rat aortic smooth muscle cells. In quiescent confluent cells, anti-PDGF-AB neutralizing antibody inhibited angiotensin II-induced DNA synthesis and protein synthesis. PDGF-AA, -AB, and -BB produced concentration-dependent increases in DNA synthesis and protein synthesis. Genistein did not inhibit PDGF-AB-induced [3H]thymidine incorporation and [3H]leucine incorporation. PDGF-AB stimulated mitogen-activated protein (MAP) kinases, and PDGF-induced MAP kinase activation was inhibited by genistein. Angiotensin II induced PDGF-A chain messenger RNA expression, and genistein inhibited angiotensin-induced PDGF gene expression. These findings suggest that endogenous PDGF is, at least in part, involved in angiotensin II-induced cell growth in rat vascular smooth muscle cells. It appears that genistein inhibits angiotensin II-induced DNA synthesis partly by inhibiting PDGF-A gene expression.

Evidence for the Involvement of Platelet-Derived Growth Factor in the Angiotensin II-Induced Growth of Rat Vascular Smooth Muscle Cells.