title: Prevention of N-nitrosodiethylamine-induced hepatocarcinogenesis by S-allylcysteine.
abstract: Chemopreventive effect of S-allylcysteine (constituent of garlic) on N-nitrosodiethylamine (NDEA)-induced hepatocarcinogenesis was evaluated in Wistar rats. Significantly decreased lipid peroxidation products (thiobarbituric acid reactive substances-TBARS and lipid hydroperoxides) with increased level of reduced glutathione, increased activities of glutathione S-transferase, and glutathione peroxidase were observed in liver of NDEA-treated rats when compared with control rats. The activities of superoxide dismutase and catalase were significantly decreased in tumor tissue when compared with control. Administration of S-allylcysteine (SAC) showed the inhibition of tumor incidence, modulated the lipid peroxidation, and increased the reduced glutathione, glutathione-dependent enzymes, superoxide dismutase, and catalase in NDEA-induced carcinogenesis. From our results, we speculate that S-allylcysteine mediates its chemopreventive effects by modulating lipid peroxidation, GST stimulation, and by increasing the antioxidants. Hence SAC prevents cells from loss of oxidative capacity in NDEA-induced hepatocarcinogenesis.
authors.affiliation: Department of Biochemistry and Biotechnology, Faculty of Science, Annamalai University, Annamalai Nagar 608 002, Tamil Nadu, India. sundarsivapatham@rediffmail.com
authors.forename: Sivapatham
authors.initials: S
authors.lastname: Sundaresan
authors.forename: Perumal
authors.initials: P
authors.lastname: Subramanian
mesh_terms: D000818:Animals; D002374:Catalase / Q000378:metabolism; D003545:Cysteine / Q000031:analogs & derivatives* / Q000494:pharmacology; D004052:Diethylnitrosamine; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000201:enzymology / Q000473:pathology; D008114:Liver Neoplasms, Experimental / Q000473:pathology* / Q000517:prevention & control*; D008297:Male; D011230:Precancerous Conditions / Q000473:pathology* / Q000517:prevention & control*; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D017392:Thiobarbituric Acid Reactive Substances; D004052:Diethylnitrosamine; C065299:S-allylcysteine; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005982:Glutathione Transferase; D005978:Glutathione; D003545:Cysteine