alexa Exogenous melatonin ameliorates hepatic injury in a rat cardiopulmonary bypass model.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Pharmacological Reports

Author(s): Huang H, Yin R, Zhu J, Feng X, Wang C,

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Abstract Hepatic injury after cardiac surgery was considered to be a consequence of cardiopulmonary bypass (CPB). This study tested the hypothesis that melatonin could attenuate the hepatic injury in a rat CPB model. Male Sprague-Dawley rats were randomly divided into four groups: sham-operation group, control group (given an equal volume of vehicle), low dose melatonin (10 mg/kg) treated group and high dose melatonin (20 mg/kg) treated group. Blood samples were collected at the beginning, at the cessation of CPB, and at 30 min, 1, 2, 3 and 24 h post-operation. Liver samples were harvested at 24 h after operation. The serum indices of the liver enzymes and systemic inflammation, as well as oxidative stress indices and the Ca++-ATPase activity of liver tissues were determined. In the control animals, the indices of liver enzymes, tumor necrosis factor-alpha (TNF-alpha) increased after operation, and liver inducible nitric oxide synthase (iNOS), malondialdehyde (MDA), myeloperoxidase (MPO) increased as well. However, the activities of liver antioxidative enzymes and the concentration of glutathione (GSH) decreased remarkably. Results in melatonin group showed that melatonin reversed all the biochemical changes, but there was no significant difference between the melatonin-treated groups. In addition, histological findings further supported these results. All results indicated that application of exogenous melatonin during operation preserves liver function by reducing oxidative stress and the systemic inflammatory response. This article was published in Eur J Pharmacol and referenced in Journal of Pharmacological Reports

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