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From the Department of Medicine (A.J.B., D.M.F., S.A.B., A.M.S., D.J.L.), Cardiology Section, Tulane University School of Medicine, New Orleans, La, and the Cardiovascular Research Laboratories (R.P., M.J.C.), Department of Pharmacology, Division of Biomedical Sciences, King's College, University of London (UK).
Correspondence to David J. Lefer, PhD, Department of Medicine/Cardiology Section, SL48, Tulane University School of Medicine, 1430 Tulane Ave, New Orleans, LA 70112.
Abstract With the knowledge of NO as an antiadhesion molecule, we performed studies to investigate the effects of NO on postischemic polymorphonuclear leukocyte (PMN)mediated myocardial contractile dysfunction. Studies were performed with isolated perfused rat hearts subjected to 20 minutes of global ischemia and 45 minutes of reperfusion. Human PMNs (50 million) were infused over the first 5 minutes of reperfusion, and the recovery of left ventricular function was compared with baseline values. Infusion of PMNs alone (n=10) led to a 61% reduction in left ventricular developed pressure (LVDP) and a 57% reduction in the pressure-rate product (PRP) at 45 minutes of reperfusion. Infusion of an NO donor, CAS-754 (n=9), resulted in 80.2±6.7% recovery of LVDP and 77.0±8.6% recovery of PRP. Treatment with L-arginine (2.5 mmol/L, n=10) resulted in a similar improvement in the postischemic contractile state of the heart. In contrast, NG-nitro-L-arginine methyl ester (L-NAME) treatment (250 µmol/L, n=10) resulted in an exacerbation of contractile dysfunction, as evidenced by a 93% reduction in LVDP at 45 minutes of reperfusion and a 91% reduction in PRP. The deleterious effects of L-NAME were prevented by L-arginine coperfusion. We failed to observe any cardioprotective effects when NO or L-arginine was administered to hearts subjected to 25 minutes of ischemia and 45 minutes of reperfusion in the absence of PMNs. In conclusion, PMN-mediated myocardial contractile dysfunction is attenuated by NO and exacerbated by blockade of NO synthesis.
Key Words: nitric oxide ischemia reperfusion NG-nitro-L-arginine methyl ester L-arginine
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