Vitamin D-Cellular Ca2+ link to obesity and diabetes

The vitamin D hormone 1,25-Dihydroxyvitamin D-3 (1,25(OH)(2)D-3)-induced cellular Ca2+- signals regulate apoptosis in adipocytes and insulin secretion from pancreatic beta-cells, and low vitamin D status is considered a risk factor for obesity and type 2 diabetes. The anti-obesity effects of 1,25(OH)(2)D-3 in mature adipocytes are determined by its activity to generate, via multiple Ca2+ signaling pathways, a sustained increase in intracellular Ca2+ followed by activation of the Ca2+-dependent initiators and effectors of apoptosis. In pancreatic beta-cells, 1,25(OH)2D3 induces synchronous Ca2+ oscillations, which pattern pulsatile insulin secretion from these cells. An increased intake of vitamin D-3 in a high fat diet-induced obesity mouse model is associated with a decreased weight of white adipose tissue due to induction of apoptosis and.the improved blood markers related to adiposity, diabetes, and vitamin D status (plasma concentrations ofglucose, insulin, adiponectin, 25-hydroxyvitamin D, and 1,25(OH)(2)D-3). High vitamin D-3 intake is also effective in increasing the mineral content of growing bone in obese mice via regulatory effects mediated by 1,25(OH)(2)D-3-parathyroid hormone axis. The 1,25(OH)(2)D-3-dependent cellular Ca2+ signaling can be important for maintaining the normal levels of apoptosis in adipose tissue and insulin secretion from pancreatic beta-cells. An increased intake of vitamin D may contribute to the prevention of obesity, type 2 diabetes, and bone disorders associated with these diseases. (C) 2015 Elsevier Ltd. All rights reserved.