title: Chemopreventive potential of neem (Azadirachta indica) on 7,12-dimethylbenz[a]anthracene (DMBA) induced hamster buccal pouch carcinogenesis.
abstract: The inhibitory effect of the aqueous extract of neem (Azadirachta indica A. Juss.) on 7,12-dimethylbenz[a]anthracene (DMBA) induced buccal pouch carcinogenesis was investigated in Syrian male hamsters. All hamsters painted on their buccal pouch with DMBA for 14 weeks developed squamous cell carcinoma. Administration of neem leaf extract effectively suppressed oral carcinogenesis initiated with DMBA as revealed by the reduced incidence of neoplasms. Lipid peroxidation, glutathione (GSH) content and the activities of glutathione peroxidase (GPx), glutathione S-transferase (GST) and gammaglutamyl transpeptidase (GGT) were used to biomonitor the chemopreventive potential of neem. Lipid peroxidation was found to be significantly decreased, whereas GSH, GPx, GST and GGT were elevated in the oral mucosa of tumour bearing animals. Our data suggest that neem may exert its chemopreventive effects in the oral mucosa by modulation of lipid peroxidation, antioxidants and detoxification systems.
authors.affiliation: Department of Biochemistry, Faculty of Science, Annamalai University, Tamil Nadu, India.
authors.forename: S
authors.initials: S
authors.lastname: Balasenthil
authors.forename: S
authors.initials: S
authors.lastname: Arivazhagan
authors.forename: C R
authors.initials: CR
authors.lastname: Ramachandran
authors.forename: V
authors.initials: V
authors.lastname: Ramachandran
authors.forename: S
authors.initials: S
authors.lastname: Nagini
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000633:toxicity*; D000818:Animals; D000970:Antineoplastic Agents / Q000302:isolation & purification / Q000627:therapeutic use*; D002273:Carcinogens / Q000633:toxicity*; D002294:Carcinoma, Squamous Cell / Q000139:chemically induced / Q000517:prevention & control*; D002610:Cheek; D006224:Cricetinae; D005979:Glutathione Peroxidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008297:Male; D008647:Mesocricetus; D009062:Mouth Neoplasms / Q000139:chemically induced / Q000517:prevention & control*; D010936:Plant Extracts / Q000302:isolation & purification / Q000627:therapeutic use*; D018515:Plant Leaves; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D005723:gamma-Glutamyltransferase / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D002273:Carcinogens; D010936:Plant Extracts; D017392:Thiobarbituric Acid Reactive Substances; D015127:9,10-Dimethyl-1,2-benzanthracene; D005979:Glutathione Peroxidase; D005723:gamma-Glutamyltransferase; D005982:Glutathione Transferase