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Am J Physiol Heart Circ Physiol 268: H614-H620, 1995;
0363-6135/95 $5.00
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AJP - Heart and Circulatory Physiology, Vol 268, Issue 2 614-H620, Copyright © 1995 by American Physiological Society

ARTICLES

Protective effect of hypoxia on mechanical and metabolic changes induced by hydrogen peroxide in rat hearts

A. Hara and Y. Abiko
Department of Pharmacology, Asahikawa Medical College, Japan.

The effect of hypoxia (20% O2 for 5 min) on the hydrogen peroxide (H2O2)-induced myocardial change was studied in the Langendorff rat heart, which was perfused at a constant flow rate and driven electrically. H2O2 decreased the left ventricular developed pressure, increased the left ventricular end-diastolic pressure, and decreased the myocardial ATP level. These mechanical and metabolic alterations induced by H2O2 were less prominent in the hypoxia-reoxygenated heart than in the normoxic heart (i.e., hypoxia had a protective effect on the H2O2-induced change). Both 8-phenyltheophylline (8-PT), a nonselective adenosine-receptor antagonist, and glyburide (Gly), an inhibitor of the ATP-sensitive potassium (KATP) channel, significantly reduced the protective effect of hypoxia. The adenosine A1-receptor antagonist 1,3-dipropyl-8-cyclopentylxanthine (DP-CPX) reduced the protective effect of hypoxia incompletely. Gly, 8-PT, and DPCPX did not affect the mechanical function and energy metabolism of the hypoxia-reoxygenated heart without H2O2. These results suggest that brief and mild hypoxia attenuates the H2O2-induced mechanical and metabolic changes and that the protective effect of hypoxia is probably mediated by activation of the adenosine receptors, which open the KATP channel.


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