Cardioprotective effect of resveratrol on lipopolysaccharide-induced oxidative stress in rat

摘要

Lipopolysaccharide (LPS) is a glycolipid component of the cell wall of Gram-negative bacteria, which induces a deleterious effect on several organs, including the heart, eventually leading to septic shock and death. Endotoxemia-induced cardiotoxicity is characterized by disturbed intracellular redox balance, excessive reactive oxygen species (ROS) accumulation, inducing DNA, protein, and membrane lipid damage. Resveratrol (trans-3,5,4' trihydroxystilbene; RVT) is a phytoalexin polyphenol that exhibits antioxidant and -inflammatory properties. We investigated the putative effect of a subacute treatment with this natural compound on LPS-induced cardiotoxicity in the rat. We found that resveratrol counteracted LPS-induced lipoperoxidation and decreased superoxide dismutase (SOD) activity, but had no effect on the LPS-induced decrease in catalase (CAT) nor on the increase in peroxidase (POD) activity. Resveratrol also reversed LPS-induced myocardial nitric oxide (NO) elevation. More important, LPS-induced iron depletion from plasma to the myocardial compartment was abolished upon resveratrol treatment. All these data suggest that resveratrol is capable of alleviating LPS-induced cardiotoxicity, and that its mode of action may involve iron-shuttling proteins.