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• W2017863279 abstract "In gastrointestinal smooth muscle, cGMP levels in response to relaxant agonists are regulated by activation of phosphodiesterase 5 and inhibition of soluble guanylyl cyclase (sGC) in a feedback mechanism via cGMP-dependent protein kinase. The aim of the present study was to determine whether contractile agonists modulate cGMP levels by cross-regulating sGC activity. In gastric muscle cells, acetylcholine (ACh) stimulated Src activity and induced sGC phosphorylation. Concurrent stimulation of cells with ACh attenuated sGC activity and cGMP formation in response to the nitric oxide (NO) donor, <i>S</i>-nitrosoglutathione (GSNO). The effect of ACh on Src activity, sGC phosphorylation, and on GSNO-stimulated sGC activity and cGMP formation were blocked by the m2 receptor antagonist (methoctramine), pertussis toxin, and by inhibitors of phosphatidylinositol 3 kinase, LY294002 [2-(4-morpholinyl)-8-phenyl-1(4<i>H</i>)-benzopyran-4-one hydrochloride], or Src kinase, 4-amino-5-(4-chlorophenyl)-7-(<i>t</i>-butyl)pyrazolo[3,4-<i>d</i>]pyrimidine, in dispersed muscle cells and in cells expressing Gα_i minigene or Gβγ-scavenging peptide, whereas the m3 receptor antagonist, <i>N</i>-(2-chloroethyl)-4-piperidinyl diphenylacetate, or expression of the Gα_q minigene had no effect. ACh also attenuated sGC activity and cGMP formation in response to the NO-independent activator, YC-1 [3-(5′-hydroxymethyl-2′furyl)-1-benzylindazole]. The pattern implied that phosphorylation of sGC by c-Src kinase inhibits NO-sensitive sGC activity, and the inhibition was not due to a decrease in the binding of NO but probably due to decrease in catalytic activity. We conclude that cGMP levels are cross-regulated by contractile agonists via a mechanism that involves c-Src-dependent phosphorylation of sGC, leading to inhibition of sGC activity and cGMP formation. The finding highlights a novel mechanism for attenuation of the NO/sGC/cGMP signal by G_i-coupled contractile agonists, in addition to their inhibitory effect on adenylyl cyclase and cAMP formation." @default.
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• W2017863279 date "2008-01-07" @default.
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• W2017863279 title "Inhibitory Phosphorylation of Soluble Guanylyl Cyclase by Muscarinic m2 Receptors via Gβγ-Dependent Activation of c-Src Kinase" @default.
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• W2017863279 doi "https://doi.org/10.1124/jpet.107.132928" @default.
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