Published online before print July 18, 2002, doi: 10.1161/01.RES.0000029970.97247.57
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© 2002 American Heart Association, Inc.
Integrative Physiology |
Aldose Reductase Is an Obligatory Mediator of the Late Phase of Ischemic Preconditioning
From the Experimental Research Laboratory, Division of Cardiology, University of Louisville and Jewish Hospital Heart and Lung Institute, Louisville, Ky. Present address for K.S. is the Division of Geriatric Medicine, Department of Internal Medicine, Keio University School of Medicine, Japan.
Correspondence to Aruni Bhatnagar, PhD, Division of Cardiology, Jewish Cardiovascular Research Center, 500 South Floyd St, Louisville, KY 40202. E-mail aruni{at}louisville.edu
Aldose reductase (AR), a member of the aldo-keto reductase superfamily, has been shown to metabolize toxic aldehydes generated by lipid peroxidation, suggesting that it may serve as an antioxidant defense. To investigate its role in the late phase of ischemic preconditioning (PC), conscious rabbits underwent 6 cycles of 4-minute coronary occlusion/4-minute reperfusion. Twenty-four hours later, there was a marked increase in AR protein and activity and in the myocardial content of sorbitol, a unique product of AR catalysis. Pretreatment with N
-nitro-L-arginine, a nitric oxide synthase inhibitor, or chelerythrine, a protein kinase C inhibitor (both given at doses that block late PC in this model), prevented the increase in AR protein 24 hours later, demonstrating that ischemic PC upregulates AR via nitric oxide- and protein kinase C-dependent signaling pathways. The AR-selective inhibitors tolrestat and sorbinil prevented AR-mediated accumulation of sorbitol and abrogated the infarct-sparing effect of late PC, demonstrating that enhanced AR activity is necessary for this cardioprotective phenomenon to occur. Inhibition of AR did not affect infarct size or the myocardial accumulation of the lipid peroxidation product 4-hydroxy trans-2-nonenal (HNE) in nonpreconditioned rabbits. The accumulation of HNE was inhibited by late PC, and this effect was abrogated by sorbinil. Taken together, these results establish AR as an essential mediator of late PC. Furthermore, the data suggest that myocardial ischemia/reperfusion injury is due in part to the generation of lipid peroxidation products and that late PC diminishes this source of injury by upregulating AR.
Key Words: myocardial ischemia/reperfusion injury • aldose reductase • myocardial infarction • 4-hydroxy-trans-2-nonenal • ischemic preconditioning
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