Cardiovascular Research Advance Access first published online on October 1, 2008
This version [Corrected Proof] published online on October 15, 2008
Cardiovascular Research, doi:10.1093/cvr/cvn260
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Delayed recovery of intracellular acidosis during reperfusion prevents calpain activation and determines protection in postconditioned myocardium
Laboratorio de Cardiología Experimental, Servicio de Cardiología, Hospital Universitari Vall d’Hebron, Passeig Vall d’Hebron, 119-129, 08035 Barcelona, Spain
* Corresponding author. Tel: +34 93 4894038; fax: +34 93 4894032.E-mail address: dgdorado{at}vhebron.net
Aims: Indirect data suggest that delayed recovery of intracellular pH (pHi) during reperfusion is involved in postconditioning protection, and calpain activity has been shown to be pH-dependent. We sought to characterize the effect of ischaemic postconditioning on pHi recovery during reperfusion and on calpain-dependent proteolysis, an important mechanism of myocardial reperfusion injury.
Methods and results: Isolated Sprague–Dawley rat hearts were submitted to 40 min of ischaemia and different reperfusion protocols of postconditioning and acidosis. pHi was monitored by 31P-NMR spectroscopy. Myocardial cell death was determined by lactate dehydrogenase (LDH) and triphenyltetrazolium staining, and calpain activity by western blot measurement of 
-fodrin degradation. In control hearts, pHi recovered within 1.5 ± 0.24 min of reperfusion. Postconditioning with 6 cycles of 10 s ischaemia–reperfusion delayed pHi recovery slightly to 2.5 ± 0.2 min and failed to prevent calpain-mediated -fodrin degradation or to elicit protection. Lowering perfusion flow to 50% during reperfusion cycles or shortening the cycles (12 cycles of 5 s ischemia–reperfusion) resulted in a further delay in pHi recovery (4.1 ± 0.2 and 3.5 ± 0.3 min, respectively), attenuated -fodrin proteolysis, improved functional recovery, and reduced LDH release (47 and 38%, respectively, P < 0.001) and infarct size (36 and 32%, respectively, P < 0.001). This cardioprotection was identical to that produced by lowering the pH of the perfusion buffer to 6.4 during the first 2 min of reperfusion or by calpain inhibition with MDL-28170.
Conclusion: These results provide direct evidence that postconditioning protection depends on prolongation of intracellular acidosis during reperfusion and indicate that inhibited calpain activity could contribute to this protection.
KEYWORDS Calpain; Acidosis; pH; Ischaemia; Reperfusion; Postconditioning
Time for primary review: 28 days
This article was guest edited by Jakob Vinten-Johansen, Emory University.
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