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The role of Na+/H+ exchange in ischemia-reperfusion

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Abstract

In ischemia the cytosol of cardiomyocytes acidifies; this is reversed upon reperfusion. One of the major pHi-regulating transport systems involved is the Na+/H+ exchanger. Inhibitors of the Na+/H+ exchanger have been found to more effectively protect ischemic-reperfused myocardium when administered before and during ischemia than during reperfusion alone. It has been hypothesized that the protection provided by pre-ischemic administration is due to a reduction in Na+ and secondary Ca2+ influx. Under reperfusion conditions Na+/H+ exchange inhibition also seems protective since it prolongs intracellular acidosis which can prevent hypercontracture. In detail, however, the mechanisms by which Na+/H+ exchange inhibition provides protection in ischemic-reperfused myocardium are still not fully identified.

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Piper, H.M., Balser, C., Ladilov, Y.V. et al. The role of Na+/H+ exchange in ischemia-reperfusion. Basic Res Cardiol 91, 191–202 (1996). https://doi.org/10.1007/BF00788905

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