β-arrestin-2 is an essential regulator of pancreatic β-cell function under physiological and pathophysiological conditions.
β-arrestins are critical signalling molecules that regulate many fundamental physiological functions including the maintenance of euglycemia and peripheral insulin sensitivity. Here we show that inactivation of the β-arrestin-2 gene, barr2, in β-cells of adult mice greatly impairs insulin release and glucose tolerance in mice fed with a calorie-rich diet. Both glucose and KCl-induced insulin secretion and calcium responses were profoundly reduced in β-arrestin-2 (barr2) deficient β-cells. In human β-cells, barr2 knockdown abolished glucose-induced insulin secretion. We also show that the presence of barr2 is essential for proper CAMKII function in β-cells. Importantly, overexpression of barr2 in β-cells greatly ameliorates the metabolic deficits displayed by mice consuming a high-fat diet. Thus, our data identify barr2 as an important regulator of β-cell function, which may serve as a new target to improve β-cell function.
Zhu, L; Almaça, J; Dadi, PK; Hong, H; Sakamoto, W; Rossi, M; Lee, RJ; Vierra, NC; Lu, H; Cui, Y; McMillin, SM; Perry, NA; Gurevich, VV; Lee, A; Kuo, B; Leapman, RD; Matschinsky, FM; Doliba, NM; Urs, NM; Caron, MG; Jacobson, DA; Caicedo, A; Wess, J
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