Sucrose Nonfermenting AMPK-related Kinase (SNARK) Regulates Exercise-stimulated and Ischemia-stimulated Glucose Transport in the Heart

Overview

Journal J Cell Biochem

Specialties Biochemistry
Cell Biology

Date 2018 Sep 27

PMID 30256437

Citations 4

Authors

Xiang-Lan Sun

Sarah J Lessard

Ding An

Ho-Jin Koh

Hiroyasu Esumi

Michael F Hirshman

Laurie J Goodyear

Affiliations

Soon will be listed here.

Abstract

The signaling mechanisms mediating myocardial glucose transport are not fully understood. Sucrose nonfermenting AMP-activated protein kinase (AMPK)-related kinase (SNARK) is an AMPK-related protein kinase that is expressed in the heart and has been implicated in contraction-stimulated glucose transport in mouse skeletal muscle. We first determined if SNARK is phosphorylated on Thr , a site critical for SNARK activity. Mice were treated with exercise, ischemia, submaximal insulin, or maximal insulin. Treadmill exercise slightly, but significantly increased SNARK Thr phosphorylation. Ischemia also increased SNARK Thr phosphorylation, but there was no effect of submaximal or maximal insulin. HL1 cardiomyocytes were used to overexpress wild-type (WT) SNARK and to knockdown endogenous SNARK. Overexpression of WT SNARK had no effect on ischemia-stimulated glucose transport; however, SNARK knockdown significantly decreased ischemia-stimulated glucose transport. SNARK overexpression or knockdown did not alter insulin-stimulated glucose transport or glycogen concentrations. To study SNARK function in vivo, SNARK heterozygous knockout mice (SNARK ) and WT littermates performed treadmill exercise. Exercise-stimulated glucose transport was decreased by ~50% in hearts from SNARK mice. In summary, exercise and ischemia increase SNARK Thr phosphorylation in the heart and SNARK regulates exercise-stimulated and ischemia-stimulated glucose transport. SNARK is a novel mediator of insulin-independent glucose transport in the heart.

Citing Articles

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