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• W2273679285 abstract "We have previously shown that vascular smooth muscle cells (VSMC) from spontaneously hypertensive rats (SHR) exhibit enhanced expression of inhibitory G proteins (Gi) and enhanced cell proliferation as compared to VSMC from Wystar-Kyoto rats (WKY). The levels of cAMP were shown to be decreased in VSMC from SHR. The present study was therefore undertaken to examine the contribution of the decreased intracellular level of cAMP in the enhanced expression of Gi proteins and increased proliferation of VSMC from SHR and to further explore the underlying molecular mechanisms responsible for this response. VSMC from SHR showed an enhanced expression of Giα-2 and Giα-3 as compared to VSMC from WKY which was decreased in a dose-dependent manner by dbcAMP, a cell-permeable cAMP analog. In addition, the enhanced functions of Gi proteins as demonstrated by enhanced inhibition of adenylyl cyclase by inhibitory hormones and forskolin (FSK)-stimulated adenylyl cyclase activity by low concentration of GTPγS in VSMC from SHR were also restored to the WKY levels by dbcAMP. The enhanced proliferation of VSMC exhibited by SHR was also attenuated by dbcAMP and forskolin, an activator of adenylyl cyclase. In addition, dbcAMP also restored the increased production of superoxide anion (O2 ), NAD(P)H oxidase activity and enhanced expression of Nox 4 and p47 phox proteins observed in VSMC from SHR to control levels. Furthermore, the increased phosphorylation of PDGF-R, EGF-R, c-Src and ERK1/2 exhibited by VSMC from SHR were also decreased by dbcAMP in a dose-dependent manner. These results suggest that decreased levels of intracellular cAMP exhibited by VSMC from SHR contributes to the enhanced expression of Gi proteins and hyperproliferation through increasing oxidative stress and transactivation of EGF-R, PDGF-R and MAP kinase signaling pathway." @default.
• W2273679285 created "2016-06-24" @default.
• W2273679285 creator A5018690101 @default.
• W2273679285 date "2012-11-02" @default.
• W2273679285 modified "2023-09-27" @default.
• W2273679285 title "Le niveau réduit d’AMPc dans la surexpression des protéines G(alpha)i et la prolifération accrue des cellules du muscle lisse vasculaire des rats spontanément hypertendus" @default.
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