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. 1994 Mar;93(3):1216–1223. doi: 10.1172/JCI117075

Mechanism of the diastolic dysfunction induced by glycolytic inhibition. Does adenosine triphosphate derived from glycolysis play a favored role in cellular Ca2+ homeostasis in ferret myocardium?

H Kusuoka 1, E Marban 1
PMCID: PMC294073  PMID: 8132761

Abstract

Several lines of evidence indicate that glycolysis is especially important for normal diastolic relaxation and for the maintenance of cellular ion homeostasis in myocardium. To elucidate whether the glycolytic flux of ATP contributes to diastolic tone and to the regulation of intracellular Ca2+, myocardial content of sugar phosphates ([SP]) and intracellular Ca2+ concentration ([Ca2+]i) were measured in isolated, perfused ferret hearts using nuclear magnetic resonance. Glucose and acetate were used as substrates for glycolysis and oxidative phosphorylation, respectively. Glycogen was effectively depleted after 15-min perfusion with glucagon (2 mg/liter), as verified by the lack of rise in [SP] during exposure to iodoacetate (100 microM) in substrate-free perfusate. Despite the fact that glycolytic flux had been blocked both by iodoacetate and by absence of substrate, end-diastolic left ventricular pressure (EDP) remained unchanged (P > 0.15, n = 6). The subsequent addition of glucose to the perfusate led to SP accumulation and a marked rise in EDP, with a significant correlation between EDP and [SP] (r = 0.86 +/- 0.04, P < 0.01, n = 6). A similar correlation was observed when glucose in the perfusate was replaced by 2-deoxyglucose (r = 0.78 +/- 0.09, P < 0.01, n = 3). Fluorine nuclear magnetic resonance measurements of [Ca2+]i verified that EDP faithfully reports changes in diastolic [Ca2+]i under the present experimental conditions. Thus, intracellular Ca2+ overload is caused by the accumulation of SP rather than by the inhibition of glycolysis per se. Glycolysis may appear to be important because its by-products are deleterious, and not necessarily because glycolytically derived ATP plays a favored role in ion homeostasis.

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Selected References

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