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- W2044201576 abstract "Recent studies implicate iNOS as the mediator of the late phase of ischemic preconditioning (PC). However, it is unknown whether induction of iNOS activity is mediated by transcriptional, post-transcriptional, translational, or post-translational mechanisms. To address this issue, we isolated and sequenced a partial iNOS cDNA expressed in preconditioned rabbit myocardium. Using a rabbit-specific probe generated from this sequence, we measured the steady state levels of the iNOS transcript after ischemic PC [six cycles of 4-min occlusion/4-min reperfusion (O/R)]. Three hours after ischemic PC, the iNOS mRNA levels in the ischemic/reperfused region were increased approximately three-fold relative to samples from the non-ischemic region and from control rabbits. This increase in mRNA levels was completely abolished by pretreatment with the NOS inhibitor Nomega -nitro- L-arginine. Conversely, administration of the NO donor nitroglycerin induced an increase in iNOS mRNA levels similar to that induced by ischemic PC. We conclude that in the conscious rabbit, ischemic PC induces an increase in iNOS mRNA levels, and that this induction is triggered by increased generation of NO during the PC stimulus. These results provide direct evidence that upregulation of iNOS is a natural response of the heart to a brief ischemic stress and that NO itself, in the absence of ischemia, upregulates myocardial iNOS transcript levels, a finding that may have implications for nitrate therapy. This previously unrecognized NO-dependent upregulation of iNOS mRNA is likely to play an important role in the development of late PC as well as in many other pathophysiological conditions in which NO is implicated." @default.
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- W2044201576 date "1999-08-01" @default.
- W2044201576 modified "2023-10-12" @default.
- W2044201576 title "Ischemic Preconditioning Increases iNOS Transcript Levels in Conscious Rabbits via a Nitric Oxide-dependent Mechanism" @default.
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- W2044201576 doi "https://doi.org/10.1006/jmcc.1999.0983" @default.
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