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. 2000 Mar 15;346(Pt 3):841–847.

Molecular mechanisms of contraction-regulated cardiac glucose transport.

M Till 1, D M Ouwens 1, A Kessler 1, J Eckel 1
PMCID: PMC1220921  PMID: 10698715

Abstract

Insulin and contraction are the most important regulators of glucose utilization in cardiac muscle. In contrast with insulin, the intracellular signalling elements of contraction have remained unexplored. In the present studies, adult rat ventricular cardiomyocytes were electrically stimulated to perform rhythmic contractions to permit the determination of potential sites of convergence of contraction and insulin signalling to glucose transport. The participation of phosphoinositide 3-kinase (PI-3K) in Ca(2+)- and contraction-stimulated 3-O-methylglucose transport was suggested by the great sensitivity of this process towards the PI-3K inhibitors wortmannin and LY294002 and by the presence of PI-3K activity in anti-phosphotyrosine immunoprecipitates from contracted cells. Initial signalling events of insulin action, including receptor kinase activation, the tyrosine phosphorylation of insulin receptor substrate (IRS)-1 and IRS-2 and the recruitment of PI-3K to IRS-1 and IRS-2, were found not to be involved in contraction-mediated signalling. However, immunoprecipitation of p85alpha revealed a markedly enhanced tyrosine phosphorylation of an unknown co-precipitated 200 kDa protein in response to both stimuli. It is concluded that contraction-regulated cardiac glucose transport involves the activation of PI-3K in response to upstream signalling pathways different from that of insulin.

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Selected References

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