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• W2062129029 startingPage "1340" @default.
• W2062129029 abstract "The purpose of this study was to identify guanine nucleotide-binding proteins (G proteins) involved in the agonist- and guanosine 5'-[gamma-thio]triphosphate (GTP[gamma-S])-induced increase in the Ca2+ sensitivity of 20-kDa myosin light chain (MLC20) phosphorylation and contraction in smooth muscle. A constitutively active, recombinant val14p21rhoA.GTP expressed in the baculovirus/Sf9 system, but not the protein expressed without posttranslational modification in Escherichia coli, induced at constant Ca2+ (pCa 6.4) a slow contraction associated with increased MLC20 phosphorylation from 19.8% to 29.5% (P < 0.05) in smooth muscle permeabilized with beta-esein. The effect of val14p21rhoA.GTP was inhibited by ADP-ribosylation of the protein and was absent in smooth muscle extensively permeabilized with Triton X-100. ADP-ribosylation of endogenous p21rho with epidermal cell differentiation inhibitor (EDIN) inhibited Ca2+ sensitization induced by GTP [in rabbit mesenteric artery (RMA) and rabbit ileum smooth muscles], by carbachol (in rabbit ileum), and by endothelin (in RMA), but not by phenylephrine (in RMA), and only slowed the rate without reducing the amplitude of contractions induced in RMA by 1 microM GTP[gamma-S] at constant Ca2+ concentrations. AlF(4-)-induced Ca2+ sensitization was inhibited by both guanosine 5'-[beta-thio]diphosphate (GDP[beta-S]) and by EDIN. EDIN also inhibited, to a lesser extent, contractions induced by Ca2+ alone (pCa 6.4) in both RMA and rabbit ileum. ADP-ribosylation of trimeric G proteins with pertussis toxin did not inhibit Ca2+ sensitization. We conclude that p21rho may play a role in physiological Ca2+ sensitization as a cofactor with other messengers, rather than as a sole direct inhibitor of smooth muscle MLC20 phosphatase." @default.
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• W2062129029 date "1996-02-06" @default.
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• W2062129029 title "Role of guanine nucleotide-binding proteins--ras-family or trimeric proteins or both--in Ca2+ sensitization of smooth muscle." @default.
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• W2062129029 doi "https://doi.org/10.1073/pnas.93.3.1340" @default.
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