{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,6,17]],"date-time":"2024-06-17T18:03:50Z","timestamp":1718647430827},"reference-count":51,"publisher":"American Physiological Society","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Heart and Circulatory Physiology"],"published-print":{"date-parts":[[2005,4]]},"abstract":"<jats:p>Hyperinsulinemia is a major risk factor for the development of vascular disease. We have reported that insulin increases the motility of vascular smooth muscle cells via a hydrogen peroxide-mediated mechanism and that nitric oxide (NO) attenuates insulin-induced motility via a cGMP-mediated mechanism. Events downstream of cGMP elevation have not yet been investigated. The aim of our study was to test the hypothesis that antimotogenic effects of NO and cGMP in cultured rat aortic smooth muscle cells are mediated via PKG, followed by reduction of cytoplasmic Ca<jats:sup>2+<\/jats:sup>levels and increased protein tyrosine phosphatase-proline, glutamate, serine, and threonine activity, leading to suppression of agonist-induced elevation of hydrogen peroxide levels and cell motility. Treatment of primary cultures with adenovirus expressing PKG-1\u03b1 mimicked NO-induced inhibition of insulin-elicited hydrogen peroxide elevation and cell motility, whereas treatment with the pharmacological PKG inhibitor Rp-8-bromo-3\u2032,5\u2032-cyclic monophosphorothioate (Rp-8-Br-cGMPS) rescued the stimulatory effects of insulin that were suppressed by NO donor. Treatment of cells with insulin failed to increase cytoplasmic Ca<jats:sup>2+<\/jats:sup>levels, whereas NO donor decreased cytoplasmic Ca<jats:sup>2+<\/jats:sup>levels in the presence or absence of insulin. Treatment of cells with the Ca<jats:sup>2+<\/jats:sup>chelator BAPTA mimicked the effects of PKG and the NO donor and increased the activity of PTP-PEST. Finally, treatment with a dominant negative allele of PTP-PEST reversed the inhibitory effect of BAPTA on cell motility and hydrogen peroxide elevation. We conclude that NO-induced inhibition of cell motility occurs via PKG-mediated reduction of basal cytoplasmic Ca<jats:sup>2+<\/jats:sup>levels, followed by increased PTP-PEST activity, leading to decreased hydrogen peroxide levels and reduced cell motility.<\/jats:p>","DOI":"10.1152\/ajpheart.01031.2004","type":"journal-article","created":{"date-parts":[[2004,12,3]],"date-time":"2004-12-03T01:19:00Z","timestamp":1102036740000},"page":"H1859-H1866","source":"Crossref","is-referenced-by-count":12,"title":["Essential role of protein kinase G and decreased cytoplasmic Ca<sup>2+<\/sup>levels in NO-induced inhibition of rat aortic smooth muscle cell 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