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Vol. 297, Issue 1, 380-387, April 2001
Departments of Pharmacological Sciences (G.R.) and Pharmacology,
Chemotherapy, and Medical Toxicology (G.R., B.M., V.D.G.C.), University
of Milan, Milan, Italy; and Department of Experimental Medicine,
Environmental and Biotechnology, University of Milano-Bicocca, Monza,
Italy (M.B., F.B.)
NCX 4016, a nitro-ester of aspirin endowed with antithrombotic
activity, appears to have clinical potential in treating cardiac complications related to coronary insufficiency. This compound has been
shown to improve postischemic ventricular dysfunction and to reduce
myocardial infarct size in the rabbit. The cardioprotection conferred
by NCX 4016 (10, 30, and 100 mg/kg) and aspirin (ASA, 54 mg/kg) was
evaluated in anesthetized rats subjected to 30 min of myocardial
ischemia followed by 120 min of reperfusion (MI/R). Drugs were given
orally for 5 consecutive days. NCX 4016 displayed remarkable
cardioprotection in rats subjected to MI/R as was evident in the
reduction of ventricular premature beats and in the incidence of
ventricular tachycardia and fibrillation; they were reduced dose
dependently and correlated with survival of all rats treated with the
higher dose of NCX 4016. In these animals, infarct size was restricted
proportionally to the dose of NCX 4016 associated with diminution of
both plasma creatine phosphokinase and cardiac myeloperoxidase
activities. ASA showed only a minor degree of protection against MI/R
damage. Rats treated with
NG-nitro-L-arginine methyl ester
(L-NAME, 10 mg/kg) demonstrated aggravated myocardial
damage in terms of arrhythmias, mortality, and infarct size.
Supplementation of nitric oxide (NO) with NCX 4016 (100 mg/kg) greatly
reduced the worsening effect caused by L-NAME. The
beneficial effects of NCX 4016 appear to derive in large part from the
NO moiety, which modulates a number of cellular events leading to
inflammation, obstruction of the coronary microcirculation, arrhythmias, and myocardial necrosis.
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