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Glycerol Kinase Stimulates Uncoupling Protein 1 Expression by Regulating Fatty Acid Metabolism in Beige Adipocytes

Overview
Journal J Biol Chem
Specialty Biochemistry
Date 2020 Apr 11
PMID 32273338
Citations 11
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Abstract

Browning of adipose tissue is induced by specific stimuli such as cold exposure and consists of up-regulation of thermogenesis in white adipose tissue. Recently, it has emerged as an attractive target for managing obesity in humans. Here, we performed a comprehensive analysis to identify genes associated with browning in murine adipose tissue. We focused on glycerol kinase (GYK) because its mRNA expression pattern is highly correlated with that of uncoupling protein 1 (UCP1), which regulates the thermogenic capacity of adipocytes. Cold exposure-induced up-regulation in inguinal white adipose tissue (iWAT) was partially abolished by knockdown (KD) Consistently, the KD inhibited expression induced by treatment with the β-adrenergic receptors (βAR) agonist isoproterenol (Iso) and resulted in impaired uncoupled respiration. KD also suppressed Iso- and adenylate cyclase activator-induced transcriptional activation and phosphorylation of the cAMP response element-binding protein (CREB). However, we did not observe these effects with a cAMP analog. Therefore KD related to Iso-induced cAMP products. In Iso-treated KD adipocytes, stearoyl-CoA desaturase 1 (SCD1) was up-regulated, and monounsaturated fatty acids such as palmitoleic acid (POA) accumulated. Moreover, a SCD1 inhibitor treatment recovered the KD-induced down-regulation and POA treatment down-regulated Iso-activated Our findings suggest that stimulates expression via a mechanism that partially depends on the βAR-cAMP-CREB pathway and -mediated regulation of fatty acid metabolism.

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