title: Naringenin reduces tumor size and weight lost in N-methyl-N'-nitro-N-nitrosoguanidine-induced gastric carcinogenesis in rats.
abstract: Carcinoma of the stomach is reportedly the second most common cancerous condition affecting the general population. Administration of antioxidants is reported to effectively alleviate the risk of gastric carcinoma. Therefore, we assessed the protective role of naringenin, an antioxidant and naturally occurring citrus flavanone, on gastric carcinogenesis induced by MNNG (200 mg/kg body weight) and S-NaCl (1 mL per rat) in Wistar rats (obtained from the Central Animal House Facility, University of Madras, Taramani Campus, Chennai, India). The animals were divided into 5 groups, and the effects of naringenin on simultaneous and posttreated stages of MNNG were tested. Cancer risk was analyzed along with their antioxidant status. The LPO levels in the experimental groups were assessed as an index of oxidative milieu. Altered redox status was subsequently investigated by assaying the superoxide and hydroxyl radicals, the enzymatic antioxidants (SOD, CAT, GPx), and the nonenzymatic antioxidants viz reduced GSH, vitamin C, and vitamin E. In the presence of MNNG, cancer incidence and LPO levels were significantly increased, whereas enzymatic (SOD, CAT, and GPx) and nonenzymatic antioxidant activities (GSH, Vitamins C, and E) were decreased in the treated rats compared with control rats. Administration of naringenin to gastric carcinoma-induced rats largely up-regulated the redox status to decrease the risk of cancer. We conclude that up-regulation of antioxidants by naringenin treatment might be responsible for the anticancer effect in gastric carcinoma.
authors.affiliation: Department of Medical Biochemistry, Dr A.L. Mudaliyar Postgraduate Institute of Basic Medical Sciences, University of Madras, Taramani Campus, Chennai 600 113, India.
authors.forename: Ganapathy
authors.initials: G
authors.lastname: Ekambaram
authors.forename: Peramaiyan
authors.initials: P
authors.lastname: Rajendran
authors.forename: Venkataraman
authors.initials: V
authors.lastname: Magesh
authors.forename: Dhanapal
authors.initials: D
authors.lastname: Sakthisekaran
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000378:metabolism*; D002277:Carcinoma / Q000139:chemically induced / Q000188:drug therapy* / Q000473:pathology; D003545:Cysteine / Q000031:analogs & derivatives; D004195:Disease Models, Animal; D044950:Flavanones / Q000494:pharmacology*; D005753:Gastric Mucosa / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D008769:Methylnitronitrosoguanidine / Q000633:toxicity; D010084:Oxidation-Reduction; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D017382:Reactive Oxygen Species / Q000378:metabolism; D013274:Stomach Neoplasms / Q000139:chemically induced / Q000188:drug therapy* / Q000473:pathology; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D015431:Weight Loss / Q000187:drug effects*
chemical_list: D000970:Antineoplastic Agents; D000975:Antioxidants; D044950:Flavanones; D017382:Reactive Oxygen Species; D017392:Thiobarbituric Acid Reactive Substances; D008769:Methylnitronitrosoguanidine; C065299:S-allylcysteine; D013482:Superoxide Dismutase; C005273:naringenin; D003545:Cysteine