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- W2037754889 abstract "The G protein alpha-subunit G(s)alpha is required for hormone-stimulated cAMP generation. In pancreatic beta cells, G(s)alpha mediates the signaling of glucagon-like peptide 1 and other incretin hormones, which are implicated as important regulators of beta cell survival and insulin release. Studies have suggested that G(s)alpha/cAMP mediates these actions by stimulating insulin receptor substrate 2 (IRS2) expression. Mice with beta cell-specific G(s)alpha deficiency (betaGsKO) were generated by mating G(s)alpha-floxed mice to rat insulin II promoter-cre recombinase mice. betaGsKO mice had poor survival and postnatal growth with low serum insulin-like growth factor 1 levels. betaGsKO mice also developed severe hyperglycemia and glucose intolerance with severe hypoinsulinemia and reduced islet insulin content and glucose-stimulated insulin release. betaGsKO mice had markedly reduced average islet size and beta cell mass, which was partially explained by reduced beta cell size. In addition, betaGsKO mice had significantly reduced beta cell proliferation and increased beta cell apoptosis and markedly reduced expression of the cell cycle protein cyclin D2. The effects on beta cell mass and proliferation, but not apoptosis, were present from birth. Unexpectedly expression of Irs2 and the downstream gene Pdx1 were unaffected. These results show that G(s)alpha/cAMP pathways are critical regulators of beta cell function and proliferation that can work through IRS2-independent mechanisms." @default.
- W2037754889 created "2016-06-24" @default.
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- W2037754889 date "2007-12-04" @default.
- W2037754889 modified "2023-09-26" @default.
- W2037754889 title "β cell-specific deficiency of the stimulatory G protein α-subunit G <sub>s</sub> α leads to reduced β cell mass and insulin-deficient diabetes" @default.
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- W2037754889 doi "https://doi.org/10.1073/pnas.0704796104" @default.
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