PMID: 9435627Jan 22, 1998Paper

High extracellular glucose impairs cardiac E-C coupling in a glycosylation-dependent manner

The American Journal of Physiology
J RenAmy J Davidoff

Abstract

Hyperglycemia is a major manifestation of all forms of diabetes mellitus and is associated with increased risk of cardiovascular disease. It is well established that cardiac excitation-contraction (E-C) coupling is adversely affected in diabetic animals such that ventricular myocyte action potential duration is prolonged and intracellular Ca2+ clearing and mechanical relaxation are slowed. We now report that ventricular myocytes incubated in a culture medium containing high extracellular glucose (25.5 mM) also exhibit these same changes in E-C coupling. These effects are not manifested for approximately 24 h after exposure. Furthermore, in the presence of normal glucose (5.5 mM), relaxation is also prolonged by fructose (20 mM), yet is unaffected by equimolar concentrations of nonmetabolizable sugars such as L-glucose and mannitol, implying that the high glucose effects require glucose entry into the cell and metabolic processing. The prolonged relaxation can also be produced by 5 mM glucosamine (an intermediate of glycosylation) and is blocked by 0.5 microgram/ml tunicamycin (an inhibitor of N-linked glycoprotein synthesis). Culturing myocytes with an inhibitor of glycation (10 mM aminoguanidine) does not prevent the high extr...Continue Reading

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Citations

Jun 14, 2000·American Journal of Physiology. Heart and Circulatory Physiology·S W SchafferV Solodushko
Nov 26, 2008·American Journal of Physiology. Heart and Circulatory Physiology·Boglarka LaczyJohn C Chatham
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