Studies have shown anti-hyperlipidemic actions of melatonin, with pharmacological doses inducing changes in cholesterol levels. This study was designed to evaluate the effect of melatonin on adriamycin-induced (25mg/kg b.w., i.p.) hyperlipidemia under constant light exposure. Melatonin was injected i.p. (1,000 microg/kg b.w./day). Triglycerides, total cholesterol, high-density lipoprotein cholesterol, light-density lipoprotein cholesterol, non-proteic nitrogen compounds (urea and creatinine levels), total protein in serum, proteins eliminated in the urine and melatonin levels in serum and kidney were determined. Results show a decrease in melatonin levels induced by both adriamycin and constant light. Likewise, adriamycin induced significant increases in triglycerides, total cholesterol and light-density lipoprotein cholesterol, and lowered high-density lipoprotein cholesterol levels. Constant light exposure also prompted an increase in LDL-c levels and a decrease in HDL-c values, and intensified the effects of adriamycin on these two lipoproteins. All changes induced by adriamycin and constant light were reverted toward normality by melatonin administration.
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