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• W2604759332 abstract "What is the central question of this study? The present study investigated the relationship between H2 S and NO in regulation of gastric fundus tension. What is the main finding and its importance? Endogenous or exogenous H2 S and NO have opposite effects on fundus tension, and H2 S-induced gastric fundus tension enhancements are mediated by inhibition of NO generation through the phosphoinositide 3-kinase/Akt pathway. These results are very important in exploring the mechanism of physiological accommodation and accommodation disorder. Hydrogen sulphide (H2 S) is considered a new gasotransmitter, along with NO and CO. It was recently confirmed that H2 S and NO play important roles in the regulation of gastrointestinal smooth muscle tension. The present study was designed to elucidate the interactions between H2 S and NO with respect to the regulation of gastric fundus smooth muscle tension using Western blotting, physiological and electrochemical techniques. Real-time H2 S and NO generation was detected in gastric smooth muscle tissue. NaHS, an H2 S donor, enhanced fundus smooth muscle tension, whereas SNP, an NO donor, decreased fundus smooth muscle tension in a dose-dependent manner. NaHS-induced increases in fundus smooth muscle tension were suppressed by l-NAME, an NO synthase inhibitor. Aminooxyacetic acid (AOAA), a cystathionine β-synthase inhibitor, exerted inhibitory effects on fundus smooth muscle tension; these effects were also suppressed by l-NAME. Real-time NO generation was significantly potentiated by AOAA. Endothelial nitric oxide synthase (eNOS) phosphorylation at serine 1177 and Akt phosphorylation at serine 308 and threonine 473 were significantly inhibited by NaHS. LY294002, a phosphoinositide 3-kinase inhibitor, blocked these NaHS-mediated effects. However, eNOS phosphorylation at serine 1177 and Akt phosphorylation at serine 308 and threonine 473 were significantly potentiated by AOAA. Cystathionine β-synthase siRNA interference significantly increased eNOS phosphorylation at serine 1177 and Akt phosphorylation at serine 308 and threonine 473. Cystathionine β-synthase siRNA interference also increased total eNOS protein expression levels but did not significantly change total Akt kinase protein expression levels. These results suggest that H2 S-induced enhancement of gastric fundus tension is mediated by inhibition of NO generation through the phosphoinositide 3-kinase/Akt pathway." @default.
• W2604759332 created "2017-04-14" @default.
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• W2604759332 date "2017-06-01" @default.
• W2604759332 modified "2023-10-14" @default.
• W2604759332 title "H₂S-induced gastric fundus smooth muscle tension potentiation is mediated by the phosphoinositide 3-kinase/Akt/endothelial nitric oxide synthase pathway" @default.
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• W2604759332 doi "https://doi.org/10.1113/ep086288" @default.
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