Abstract
Previous studies revealed that oxidative stress could be an important component of the mechanism of organophosphate (OP) compound toxicity. The aim of the present study was to investigate both prophylactic and therapeutic effects of melatonin against fenthion-induced oxidative stress in rats. Therefore, we determined the changes in the levels of reduced glutathione (GSH) and malondialdehyde (MDA) in the whole blood, brain, pectoral muscle, liver, lung, heart, kidney, pancreas, and jejunum. Also, the changes in the levels of serum nitrite and nitrate, ascorbic acid, retinal, b-carotene, and ceruloplasmin were measured. In addition, activities of enzymatic antioxidants superoxide dismutase (SOD), glutathione peroxidase (GPx), and catalase (CAT) in erythrocyte of normal and experimental animals were measured. It was found that fenthion administration increased the levels of MDA in all tissues and decreased or increased the levels of GSH in some tissues. In comparison to nitrate, nitrite and ascorbic acid levels in the serum of experimental groups, there was no significant difference between groups. However, fenthion toxicity led to decrease in retinol and β-carotene levels; melatonin administration significantly prevented this decrease. Serum ceruloplasmin level was increased due to fenthion administration, but prophylactic and therapeutic melatonin administration inhibited the increase in ceruloplasmin level of serum. There was no significant change in SOD levels in melatonin-administered groups. Melatonin modulates the fenthion-induced changes in the activities of GPx and CAT. In conclusion, the results of the current study revealed that OP toxicity, induced by fenthion, activated oxidant systems in all antioxidant systems in some tissues. Melatonin administration led to a marked increase in antioxidant activity and inhibited lipid peroxidation in most of tissues.
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Buyukokuroglu, M.E., Cemek, M., Yurumez, Y. et al. Antioxidative role of melatonin in organophosphate toxicity in rats. Cell Biol Toxicol 24, 151–158 (2008). https://doi.org/10.1007/s10565-007-9024-z
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DOI: https://doi.org/10.1007/s10565-007-9024-z