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• W2006262105 abstract "This study tested the hypothesis that endogenous adenosine depresses anaerobic glycolysis in preischaemic and moderately ischaemic myocardium.Isolated, working guinea-pig hearts, perfused with glucose-fortified Krebs-Henseleit buffer, were subjected to 15 min mild hypoperfusion (coronary flow 60% of baseline) followed by 10 min ischaemia (coronary flow 20% of baseline). Adenosine A1 receptors were blocked with 8-p-sulfophenyl theophylline (8-SPT; 20 microM). Glucose oxidation and lactate production from exogenous glucose were assessed from 14CO2 and [14C]lactate formation, respectively, from [U-14C]glucose. Energy metabolites, glycolytic intermediates and glycogen were measured in extracts of stop-frozen preischaemic, mildly hypoperfused and ischaemic myocardium.Adenosine receptor blockade did not affect left ventricular function assessed from heart rate x pressure product and pressure x volume work although coronary flow was slightly reduced. Adenosine receptor blockade increased glucose uptake (P < 0.05) by 100% during preischaemia and by 74% during mild hypoperfusion, and increased lactate production from exogenous glucose (P < 0.05) by 89% during preischaemia and fourfold during mild hypoperfusion, but did not stimulate glucose oxidation under any condition. Glycogen degradation was not increased by adenosine receptor blockade during ischaemia. Crossover plots of glycolytic intermediates revealed that phosphofructokinase was activated by adenosine receptor blockade at all three levels of perfusion.Endogenous adenosine attenuates anaerobic glycolysis in normally perfused, hypoperfused and ischaemic myocardium by blunting phosphofructokinase activity; this effect is mediated by adenosine A1 receptors." @default.
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• W2006262105 date "1997-01-01" @default.
• W2006262105 modified "2023-10-14" @default.
• W2006262105 title "Adenosine receptor blockade enhances glycolysis in hypoperfused guinea-pig myocardium" @default.
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• W2006262105 doi "https://doi.org/10.1016/s0008-6363(96)00182-4" @default.
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