title: Catechin as an antioxidant in liver mitochondrial toxicity: Inhibition of tamoxifen-induced protein oxidation and lipid peroxidation.
abstract: Tamoxifen (TAM) is a nonsteroidal triphenylethylene antiestrogenic drug widely used in the treatment and prevention of breast cancer. TAM brings about a collapse of the mitochondrial membrane potential. It acts both as an uncoupling agent and as a powerful inhibitor of mitochondrial electron transport chain. The effect of catechin pretreatment on the mitochondrial toxicity of TAM was studied in liver mitochondria of Swiss albino mice. TAM treatment caused a significant increase in the mitochondrial lipid peroxidation (LPO) and the protein carbonyls (PCs). It also caused a significant increase in superoxide radical production. Pretreatment of mice with catechin (40 mg/kg) showed significant protection as demonstrated by marked attenuation of increased oxidative stress parameters such LPO, PCs, and superoxide production. It also restored the decreased nonenzymatic and enzymatic antioxidants of mitochondria. The inhibitory effect of catechin on TAM-:induced oxidative damage suggests that it may have potential benefits in prevention of human diseases where reactive oxygen species have some role as causative agents.
authors.affiliation: Immunotoxicology Laboratory, Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), New Delhi 110 062, India.
authors.forename: Heena
authors.initials: H
authors.lastname: Tabassum
authors.forename: Suhel
authors.initials: S
authors.lastname: Parvez
authors.forename: Hasibur
authors.initials: H
authors.lastname: Rehman
authors.forename: Basu Dev
authors.initials: BD
authors.lastname: Banerjee
authors.forename: Sheikh
authors.initials: S
authors.lastname: Raisuddin
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002392:Catechin / Q000494:pharmacology*; D005978:Glutathione / Q000031:analogs & derivatives / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D051379:Mice; D008930:Mitochondria, Liver / Q000187:drug effects* / Q000378:metabolism*; D010084:Oxidation-Reduction / Q000187:drug effects; D050050:Protein Carbonylation; D013438:Sulfhydryl Compounds / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism; D013629:Tamoxifen / Q000633:toxicity*
chemical_list: D000975:Antioxidants; D013438:Sulfhydryl Compounds; D013629:Tamoxifen; D013481:Superoxides; D002392:Catechin; D005978:Glutathione