title: Chemopreventive effect of piperine on mitochondrial TCA cycle and phase-I and glutathione-metabolizing enzymes in benzo(a)pyrene induced lung carcinogenesis in Swiss albino mice.
abstract: Piperine is a major component of black (Piper nigrum Linn) and long pepper (Piper longum Linn) used widely in various systems of traditional medicine. We have evaluated the effect of piperine on mitochondrial tricarboxylic acid cycle and phase I and glutathione-metabolizing enzymes in Benzo(a)pyrene induced experimental lung carcinogenesis in swiss albino mice. Lung cancer bearing mice showed a significant decrease in the activities of mitochondrial enzymes-isocitrate dehydrogenase (ICDH), -ketoglutarate dehydrogenase (KDH), succinate dehydrogenase (SDH), malate dehydrogenase (MDH) and significantly increased NADPH-Cytochorome reductase (NADPH-C reductase), cytochrome P450 (cyt-p450) and cytochrome b5(cyt-b5). The activities of glutathione-metabolizing enzymes glutathione peroxidase(GPx), glutathione reductase (GR) and glucose-6-phospho dehydrogenase(G6PDH) were significantly lowered in lung-cancer bearing mice when compared with control mice. Piperine supplementation to tumour-induced animals significantly lowered the phase-I enzymes (NADPH-C reductase, cyt-p450 and cyt-b5)) and there was a rise in glutathione-metabolizing enzymes (GPx, GR and G6PDH), which indicated an antitumour and anti-cancer effect. Comparison of normal control mice and mice administered piperine only as drug control showed no significant variations in enzyme activities. Piprine administration to benzo(a)pyrene induced animals significantly increased the activities of mitochondrial enzymes, thereby suggesting its role in mitochondrial energy production.
authors.affiliation: Department of Medical Biochemistry, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, Taramani Campus, Chennai 600 113, India. selvakphd@yahoo.com
authors.forename: K
authors.initials: K
authors.lastname: Selvendiran
authors.forename: C
authors.initials: C
authors.lastname: Thirunavukkarasu
authors.forename: J Prince Vijeya
authors.initials: JP
authors.lastname: Singh
authors.forename: R
authors.initials: R
authors.lastname: Padmavathi
authors.forename: D
authors.initials: D
authors.lastname: Sakthisekaran
mesh_terms: D000470:Alkaloids / Q000494:pharmacology*; D000818:Animals; D016588:Anticarcinogenic Agents / Q000494:pharmacology*; D001564:Benzo(a)pyrene / Q000633:toxicity; D052117:Benzodioxoles; D002952:Citric Acid Cycle / Q000187:drug effects; D065607:Cytochrome P-450 Enzyme Inhibitors; D004798:Enzymes / Q000187:drug effects / Q000378:metabolism*; D005978:Glutathione / Q000378:metabolism*; D008099:Liver / Q000187:drug effects / Q000201:enzymology; D008175:Lung Neoplasms / Q000139:chemically induced / Q000517:prevention & control*; D008297:Male; D051379:Mice; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism*; D010880:Piperidines / Q000494:pharmacology*; D053284:Polyunsaturated Alkamides
chemical_list: D000470:Alkaloids; D016588:Anticarcinogenic Agents; D052117:Benzodioxoles; D065607:Cytochrome P-450 Enzyme Inhibitors; D004798:Enzymes; D010880:Piperidines; D053284:Polyunsaturated Alkamides; D001564:Benzo(a)pyrene; D005978:Glutathione; C008922:piperine