Cardioprotective Effect of Modified Peroxiredoxins in Retrograde Perfusion of Isolated Rat Heart under Conditions of Oxidative Stress

Resumo

Antioxidant properties of recombinant peroxiredoxin-6 and chimeric protein PSH combining peroxidase and superoxide dismutase activities were studied on the model of retrograde perfusion of isolated rat heart under conditions of H₂O₂-induced oxidative stress. The exogenous antioxidant proteins exhibited cardioprotective properties manifested in heart rate normalization, maintenance of contractile activity of the myocardium, and prevention of H₂O₂-induced LPO in oxidative stress. Localization of peroxiredoxin-6 and PSH in the cardiac tissue was determined and myocardial structures most effectively protected by the antioxidant enzymes from ischemia/reperfusion-induced damages were identified. The results suggest that modified peroxiredoxins are promising components of perfusion media for preservation of isolated organs.