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Role of ghrelin-induced phosphatidylinositol 3-kinase activation in modulation of gastric mucosal inflammatory responses to Helicobacter pylori.

Inflammopharmacology. 2014 Jun;22(3):169-77. doi:10.1007/s10787-013-0190-8. Epub 2013 Sep 21
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摘要


A peptide hormone, ghrelin, is recognized as an important modulator of gastric mucosal inflammatory responses to Helicobacter pylori through the regulation of Src/Akt-dependent activation of constitutive nitric oxide synthase (cNOS) by phosphorylation. In this study, we report on the role of phosphatidylinositol 3-kinase (PI3K) in the processes of Src/Akt activation in gastric mucosal cells exposed to H. pylori LPS. We demonstrate that cNOS activation through phosphorylation induced by ghrelin is associated with PI3K activation which occurs upstream of cSrc, and that PI3K is required for cSrc activation of Akt. We show further that ghrelin-induced activation of PI3K, as well as that of Src and Akt, was susceptible to suppression by the inhibitors of phospholipase C (U73122) and protein kinase C (BIM). Both these inhibitors also blocked the ghrelin-induced membrane translocation of PI3K and cSrc, whereas the inhibitor of PI3K (LY294002) blocked only the membrane translocation of cSrc. Collectively, our findings suggest that the modulatory influence of ghrelin in countering gastric mucosal responses to H. pylori LPS relies on PI3K activation that depends on signaling pathway, and that PI3K activity is required for the induction of cSrc/Akt activation.

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