Vitamin D Status and Vitamin D-Dependent Apoptosis in Obesity

Overview

Journal Nutrients

Date 2020 May 17

PMID 32413960

Citations 20

Authors

Igor N Sergeev

Affiliations

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Abstract

The role of vitamin D in obesity appears to be linked to vitamin D insufficient/deficient status. However, mechanistic understanding of the role of vitamin D in obesity is lacking. We have shown earlier that the vitamin D hormonal form, 1,25-dihydroxyvitamin D (1,25(OH)D), induces cell death by apoptosis in mature adipocytes. This effect of the hormone is mediated by the cellular Ca signaling pathway: a sustained increase of intracellular (cytosolic) Ca concentration followed by activation of Ca-dependent initiators and effectors of apoptosis. In recent animal studies, we demonstrated that low vitamin D status is observed in diet-induced obesity (DIO). High intake of vitamin D in DIO decreased the weight of white adipose tissue and improved biomarkers related to adiposity and Ca regulation. The anti-obesity effect of vitamin D (1,25(OH)D) in DIO was determined by the induction of Ca-mediated apoptosis in mature adipocytes executed by Ca-dependent apoptotic proteases (calpains and caspases). Thus, a high intake of vitamin D in obesity increases vitamin D nutritional status and normalizes vitamin D hormonal status that is accompanied by the reduction of adiposity. Overall, our findings imply that vitamin D may contribute to the prevention of obesity and obesity-related diseases and that the mechanism of the anti-obesity effect of 1,25(OH)D includes induction of Ca-mediated apoptosis in adipocytes.

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