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- W2189690655 abstract "In the well-perfused heart, pyruvate carboxylation accounts for 3–6% of the citric acid cycle (CAC) flux, and CAC carbon is lost via citrate release. We investigated the effects of an acute reduction in coronary flow on these processes and on the tissue content of CAC intermediates. Measurements were made in an open-chest anesthetized swine model. Left anterior descending coronary artery blood flow was controlled by a extracorporeal perfusion circuit, and flow was decreased by 40% for 80 min to induce myocardial hibernation ( n = 8). An intracoronary infusion of [U- 13 C 3 ]lactate and [U- 13 C 3 ]pyruvate was given to measure the entry of pyruvate into the CAC through pyruvate carboxylation from the 13 C-labeled isotopomers of CAC intermediates. Compared with normal coronary flow, myocardial hibernation resulted in parallel decreases of 65% and 79% in pyruvate carboxylation and net citrate release by the myocardium, respectively, and maintenance of the CAC intermediate content. Elevation of the arterial pyruvate concentration by 1 mM had no effect. Thus a 40% decrease in coronary blood flow resulted in a concomitant decrease in pyruvate carboxylation and citrate release as well as maintenance of the CAC intermediates." @default.
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- W2189690655 date "2001-10-01" @default.
- W2189690655 modified "2023-09-30" @default.
- W2189690655 title "Acute hibernation decreases myocardial pyruvate carboxylation and citrate release" @default.
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- W2189690655 doi "https://doi.org/10.1152/ajpheart.2001.281.4.h1613" @default.
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