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Am J Physiol Heart Circ Physiol 279: H2360-H2371, 2000;
0363-6135/00 $5.00
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Vol. 279, Issue 5, H2360-H2371, November 2000

Biphasic response of cardiac NO synthase isoforms to ischemic preconditioning in conscious rabbits

Yu-Ting Xuan, Xian-Liang Tang, Yumin Qiu, Supratim Banerjee, Hitoshi Takano, Hui Han, and Roberto Bolli

Experimental Research Laboratory, Division of Cardiology, University of Louisville, and the Jewish Hospital Heart and Lung Institute, Louisville, Kentucky 40292

In conscious rabbits, a sequence of six 4-min coronary occlusion/4-min reperfusion cycles, which elicits late preconditioning (PC), caused rapid activation of calcium-dependent nitric oxide (NO) synthase (NOS) [cNOS; endothelial NOS (eNOS) and/or neuronal NOS (nNOS)], whereas calcium-independent NOS [inducible NOS (iNOS)] activity remained unchanged. The enhanced cNOS activity was associated with increased myocardial levels of NO2 and/or NO3 (NOx). Twenty-four hours after ischemic PC was induced, the opposite pattern was observed, i.e., there was a pronounced increase in cytosolic iNOS activity but no change in cNOS activity. The initial burst of ischemia-induced cNOS activity was not affected by pretreatment with the antioxidant N-2-mercaptopropionyl glycine (MPG), the protein kinase C (PKC) inhibitor chelerythrine, or the tyrosine kinase inhibitor lavendustin A, indicating that it is independent of the generation of oxidant species and the activation of PKC and tyrosine kinases. In contrast, the delayed upregulation of iNOS 24 h after PC was prevented by pretreatment with Nomega -nitro-L-arginine, MPG, or chelerythrine before the PC ischemia, indicating that it is triggered by a signaling mechanism that involves the generation of NO, the formation of oxidant species, and the activation of PKC. Taken together, these results demonstrate that, in conscious animals, ischemic PC elicits a biphasic response in cardiac NOS activity, i.e., an immediate activation of cNOS (most likely eNOS) followed 24 h later by a delayed upregulation of iNOS. To our knowledge, this is the first study to directly measure NOS activity after brief myocardial ischemia in vivo. In conjunction with previous functional studies, the data support a distinctive role of NOS isoforms in late PC, with eNOS serving as the trigger on day 1 and iNOS as the mediator on day 2.

nitric oxide synthase; chelerythrine; Nomega -nitro-L-arginine; reactive oxygen species; protein tyrosine kinases


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