Glycerol Kinase Stimulates Uncoupling Protein 1 Expression by Regulating Fatty Acid Metabolism in Beige Adipocytes
Overview
Authors
Affiliations
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.
Ding Y, Lan J, Wang Y, Pan Y, Song T, Liu S NPJ Sci Food. 2025; 9(1):3.
PMID: 39774946 PMC: 11707143. DOI: 10.1038/s41538-024-00359-7.
Gao G, Liu R, Hu S, He M, Zhang J, Gao D J Anim Sci Biotechnol. 2024; 15(1):60.
PMID: 38693536 PMC: 11064361. DOI: 10.1186/s40104-024-01016-5.
Cetin E, Pedersen B, Porter L, Adler G, Burak M Front Endocrinol (Lausanne). 2024; 14:1306528.
PMID: 38313838 PMC: 10835623. DOI: 10.3389/fendo.2023.1306528.
Hyperphagia of female UCP1-deficient mice blunts anti-obesity effects of FGF21.
Klein Hazebroek M, Laterveer R, Kutschke M, Ramsak Marceta V, Barthem C, Keipert S Sci Rep. 2023; 13(1):10288.
PMID: 37355753 PMC: 10290677. DOI: 10.1038/s41598-023-37264-0.
Coulter A, Greenway F, Zhang D, Ghosh S, Coulter C, James S Front Endocrinol (Lausanne). 2023; 14():1148954.
PMID: 37143734 PMC: 10153092. DOI: 10.3389/fendo.2023.1148954.