Prevention by melatonin of hepatocarcinogenesis in rats injected with N-nitrosodiethylamine
Article first published online: 19 JUL 2007
Journal of Pineal Research
Volume 43, Issue 3, pages 305–312, October 2007
How to Cite
Subramanian, P., Mirunalini, S., Dakshayani, K. B., Pandi-Perumal, S. R., Trakht, I. and Cardinali, D. P. (2007), Prevention by melatonin of hepatocarcinogenesis in rats injected with N-nitrosodiethylamine. Journal of Pineal Research, 43: 305–312. doi: 10.1111/j.1600-079X.2007.00478.x
- Issue published online: 19 JUL 2007
- Article first published online: 19 JUL 2007
- Received May 04, 2007; accepted June 21, 2007.
- alanine transaminase;
- antioxidant status;
- aspartate transaminase;
- lipid peroxidation;
Abstract: N-nitrosodiethylamine (NDEA) is a potent carcinogenic agent that induces liver cancer. To evaluate the chemopreventive function of melatonin in this experimental model, Wistar male rats received a single i.p. injection of NDEA or vehicle followed by weekly s.c. injections of carbon tetrachloride or vehicle for 6 weeks. Melatonin (5 mg/kg body weight) or its vehicle (0.5 mL saline) was given i.p. on a daily basis 2 hr before lights off for 20 wk. At the end of this period the rats were killed and liver and blood samples were taken for histological and biochemical studies. As markers for liver function, the activity of aspartate transaminase (AST) and alanine transaminase (ALT) and the levels of α-fetoprotein were measured in serum. To assess lipid peroxidation and the antioxidant status in liver and blood, the levels of thiobarbituric acid reactive substances (TBARS) and of reduced glutathione (GSH) were measured. The activity of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione S-transferase (GST) was assessed in liver and erythrocyte fraction of NDEA-treated rats. NDEA administration inhibited body weight, macro- and microscopically detectable liver tumors and increased levels of plasma AST, ALT and α-fetoprotein. NDEA treatment decreased liver TBARS levels and CAT and SOD activities and increased liver GSH levels and GST and GPx activities. Plasma TBARS were augmented, while plasma GSH levels and the activities of erythrocyte CAT, SOD, GST and GPx decreased, in NDEA-treated rats. Melatonin administration significantly curtailed tumor development and counteracted all the biochemical effects.