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AJP - Endocrinology and Metabolism, Vol 265, Issue 5 E673-E679, Copyright © 1993 by American Physiological Society
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M. Kohno, M. Ikeda, M. Johchi, T. Horio, K. Yasunari, N. Kurihara and T. Takeda
First Department of Internal Medicine, Osaka City University Medical School, Japan.
The present study examined the possible interaction of platelet-derived growth factor (PDGF) and atrial or brain natriuretic peptides (ANP and BNP, respectively) on cellular proliferation and secretion of endothelin-1 in cultured rat mesangial cells. PDGF increased cellular proliferation and endothelin-1 secretion. The protein kinase C (PKC) inhibitors, 1-(5-isoquinolinylsulfonyl)-2-methylpiperazine, staurosporine, and PKC inhibitor peptide, inhibited such stimulation. Rat ANP-(1-28) and rat BNP-45 exhibited clearly dose-related inhibition of PDGF-stimulated cellular proliferation and endothelin-1 secretion. This inhibition by ANP and BNP was paralleled by an increase in the cellular level of guanosine 3',5'-cyclic monophosphate (cGMP). Results indicate that PDGF stimulates cellular proliferation and endothelin-1 secretion in cultured rat mesangial cells by a mechanism probably involving activation of PKC and that ANP and BNP inhibit such stimulation through a cGMP-dependent process.
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