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Inigo Ruis de Azua RGS4 is a negative regulator of insulin release from pancreatic beta-cells in vitro and vivo

Abstract :

Therapeutic strategies that augment insulin release from pancreatic beta-cells are considered beneficial in the treatment of type 2 diabetes.
We previously demonstrated that activation of beta-cell M3 muscarinic receptors (M3Rs) greatly promotes glucose-stimulated insulin secretion (GSIS), suggesting that strategies aimed at enhancing signaling through beta-cell M3Rs may become therapeutically useful. M3R activation leads to the stimulation of G proteins of the Gq family, which are under the inhibitory control of proteins known as regulators of G protein signaling (RGS proteins). At present, it remains unknown whether RGS proteins play a role in regulating insulin release. To address this issue, we initially demonstrated that MIN6 insulinoma cells express functional M3Rs and that RGS4 was by far the most abundant RGS protein expressed by these cells. Strikingly, siRNA-mediated knockdown of RGS4 expression in MIN6 cells greatly enhanced M3R-mediated augmentation of GSIS and calcium release. We obtained similar findings using pancreatic islets prepared from RGS4-deficient mice. Interestingly, RGS4 deficiency had little effect on insulin release caused by activation of other beta-cell GPCRs. Finally, treatment of mutant mice selectively lacking RGS4 in pancreatic beta-cells with a muscarinic agonist (bethanechol) led to significantly increased plasma insulin and reduced blood glucose levels, as compared to control littermates. Studies with beta-cell-specific M3R knockout mice showed that these responses were mediated by !-cell M3Rs. These findings indicate that RGS4 is a potent negative regulator of M3R function in pancreatic beta-cells, suggesting that RGS4 may represent a potential target to promote insulin release for therapeutic purposes.

Selected publications

RGS4 is a negative regulator of insulin release from pancreatic beta-cells in vitro and in vivo.Ruiz de Azua I, Scarselli M, Rosemond E, Gautam D, Jou W, Gavrilova O, Ebert PJ, Levitt P, Wess J.Proc Natl Acad Sci U S A. 2010 Apr 27;107(17):7999-8004. Epub 2010 Apr 12.

Dinesh Gautam, Inigo Ruiz de Azua, Jian Hua Li, Jean-Marc Guettier, Thomas Heard, Yinghong Cui, Hiuyan Lu, William Jou, Oksana Gavrilova, Walter Zawalich, and Jurgen Wess. (2010). Beneficial Metabolic Effects Caused by Persistent Activation of b-cell M3 Muscarinic Acetylcholine Receptors in Transgenic Mice. Endocrinology, 151: 185-194.

A chemical-genetic approach to study G protein regulation of beta cell function in vivo.Guettier JM, Gautam D, Scarselli M, Ruiz de Azua I, Li JH, Rosemond E, Ma X, Gonzalez FJ, Armbruster BN, Lu H, Roth BL, Wess J.Proc Natl Acad Sci U S A. 2009 Nov 10;106(45):19197-202. Epub 2009 Oct 26.

Giovanni Marsicano