Catalytic Peroxynitrite Decomposition Improves Reperfusion Injury After Heart Transplantation

Overview

Journal J Thorac Cardiovasc Surg

Specialties Cardiology & Vascular Diseases
General Surgery
Pulmonary Medicine

Date 2012 Mar 10

PMID 22401641

Citations 7

Authors

Gabor Szabo

Sivakkanan Loganathan

Bela Merkely

John T Groves

Matthias Karck

Csaba Szabo

Tamas Radovits

Affiliations

Soon will be listed here.

Abstract

Objective: Peroxynitrite, a reactive nitrogen species, has been implicated in the development of ischemia-reperfusion injury. The present study investigated the effects of the potent peroxynitrite decomposition catalyst FP15 on myocardial and endothelial function after hypothermic ischemia-reperfusion in a heterotopic rat heart transplantation model.

Methods: After a 1-hour ischemic preservation and implantation of donor hearts, reperfusion was started after application of vehicle (5% glucose solution) or FP15 (0.3 mg/kg). The assessment of left ventricular pressure-volume relations, total coronary blood flow, endothelial function, immunohistochemical markers of nitro-oxidative stress, and myocardial high-energy phosphates was performed at 1 and 24 hours of reperfusion.

Results: After 1 hour of reperfusion, myocardial contractility (maximal slope of systolic pressure increment at 140 μL left ventricular volume: 5435 ± 508 mm Hg/s vs 2346 ± 263 mm Hg/s), coronary blood flow (3.98 ± 0.33 mL/min/g vs 2.74 ± 0.29 mL/min/g), and endothelial function were significantly improved, nitro-oxidative stress was reduced, and myocardial high-energy phosphate content was preserved in the FP15-treated animals compared with controls.

Conclusions: Pharmacologic peroxynitrite decomposition reduces reperfusion injury after heart transplantation as the result of reduction of nitro-oxidative stress and prevention of energy depletion and exerts a beneficial effect against reperfusion-induced graft cardiac and coronary endothelial dysfunction.

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