title: Comparison of the chemopreventive potentials of melatonin and vitamin E plus selenium on 7,12-dimethylbenz[a]anthracene-induced inhibition of mouse liver antioxidant enzymes.
abstract: Chemoprevention is a rapidly growing area of oncology that is identifying agents with a potentially preventive role in cancer. In this study, it was our goal to compare the chemopreventive effects of vitamin E plus selenium, and melatonin. Forty female mice were divided into four equal groups. The first group served as control. The second group had i.p. injections of 7,12-dimethylbenz[a]anthracene (DMBA) (20 mg/kg body weight) in corn oil for 21 days. The third group had the same procedure of DMBA injections as the second group and received vitamin E + selenium (90 microg + 1.8 microg/day), simultaneously. The fourth group had DMBA injections and melatonin (4.2 mg/kg body weight), simultaneously. DMBA alone caused significant inhibition of hepatic glutathione peroxidase (GSHPx), catalase (CAT), and superoxide dismutase (SOD) in the second group. In the third group, vitamin E + selenium restored DMBA-induced GSHPx inhibition significantly whereas CAT and SOD inhibition remained essentially unchanged. In the fourth group, melatonin not only significantly decreased DMBA-induced GSHPx inhibition but also fully reversed CAT and SOD inhibitions caused by DMBA. We speculate that melatonin alone provides better chemoprevention against DMBA-induced oxidative stress than the vitamin E+selenium combination.
authors.affiliation: Inönü University, Faculty of Education, Department of Chemical Education, 44069 Malatya, Turkey.
authors.forename: K
authors.initials: K
authors.lastname: Batcioğlu
authors.forename: A A
authors.initials: AA
authors.lastname: Karagözler
authors.forename: M
authors.initials: M
authors.lastname: Genç
authors.forename: S
authors.initials: S
authors.lastname: Celik
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000037:antagonists & inhibitors*; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002273:Carcinogens / Q000037:antagonists & inhibitors*; D002374:Catalase / Q000378:metabolism; D005260:Female; D005979:Glutathione Peroxidase / Q000378:metabolism; D008099:Liver / Q000187:drug effects* / Q000201:enzymology*; D008550:Melatonin / Q000494:pharmacology*; D051379:Mice; D012643:Selenium / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000378:metabolism; D014810:Vitamin E / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D002273:Carcinogens; D014810:Vitamin E; D015127:9,10-Dimethyl-1,2-benzanthracene; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D012643:Selenium; D008550:Melatonin