© 2001 by European Society of Cardiology
Copyright © 2001, European Society of Cardiology
Na+ entry during ischemia, reperfusion and preconditioning
Department of Physiology and Institute for Biomedical Research, University of Sydney F13, NSW 2006, Australia
* Corresponding author. Tel.: +61-2-9351-4602; fax: +61-2-9351-4602
Received 23 January 2001; accepted 23 January 2001
| The first 150 words of the full text of this article appear below. |
In our recent series of papers [1–3] we have measured intracellular sodium and pH ([Na+]i and pHi) in rat hearts during ischemia and reperfusion and draw the following conclusions about the activity of the cardiac Na+/H+ exchanger (NHE1). (i) NHE1 is inactive during ischemia. (ii) Normally NHE1 reactivates rapidly on reperfusion causing a large Na+ influx which is the precursor to much of the cellular damage. (iii) However in the preconditioned heart NHE1 remains inactive during early reperfusion and this underlies much of the protective effects of preconditioning. Our evidence and interpretation are different to many earlier studies, as Avkiran et al. [4] point out, and we are pleased to have this opportunity to debate the reasons for these differences and consider the implications of our novel interpretation.
We would first like to comment on the statement by Avkiran et al. Much of this evidence, which suggests
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