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Am J Physiol Heart Circ Physiol 273: H2257-H2262, 1997;
0363-6135/97 $5.00
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Vol. 273, Issue 5, H2257-H2262, November 1997

Decreased intracellular pH is not due to increased H+ extrusion in preconditioned rat hearts

Scott A. Gabel1, Heather R. Cross1, Robert E. London1, Charles Steenbergen2, and Elizabeth Murphy1

1 Laboratory of Molecular Biophysics, National Institute of Environmental Health Sciences, Research Triangle Park 27709; and 2 Department of Pathology, Duke University Medical Center, Durham, North Carolina 27710

Ischemic preconditioning reduces intracellular acidification during a subsequent, prolonged period of ischemia. This may reflect decreased anaerobic glycolysis or increased H+ efflux. To distinguish between these hypotheses, we monitored intracellular and extracellular pH during a sustained period of ischemia to determine whether the preconditioned hearts had increased H+ efflux compared with nonpreconditioned hearts. At the end of 20 min of ischemia, intracellular pH in nonpreconditioned hearts was 5.90 ± 0.08 and extracellular pH was 5.51 ± 0.21, whereas in preconditioned hearts, intracellular pH was 6.50 ± 0.06 and extracellular pH was 6.62 ± 0.06. To investigate whether an Na+/H+ exchange inhibitor would alter the reduced acidification during ischemia, we preconditioned hearts with and without dimethylamiloride (DMA). Intracellular pH during ischemia was similar in preconditioned hearts with and without DMA treatment (pH 6.42 ± 0.02 vs. 6.45 ± 0.03, respectively). These data do not support the hypothesis that enhanced proton efflux is responsible for the more alkaline intracellular pH during sustained ischemia in preconditioned hearts.

preconditioning; phosphorus-31 nuclear magnetic resonance


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