title: Piperine mediated alterations in lipid peroxidation and cellular thiol status of rat intestinal mucosa and epithelial cells.
abstract: Piperine (1-Piperoyl piperidine) is the major alkaloid of black and long peppers used widely in various systems of traditional medicine. The present study investigates the toxicity of piperine via free-radical generation by determining the degree of lipid peroxidation and cellular thiol status in the rat intestine. Lipid peroxidation content, measured as thiobarbituric reactive substances (TBARS), was increased with piperine treatment although conjugate diene levels were not altered. A significant increase in glutathione levels was observed, whereas protein thiols and glutathione reductase activity were not altered. The study suggests that increased TBARS levels may not be a relevant index of cytotoxicity, since thiol redox was not altered, but increased synthesis transport of intracellular GSH pool may play an important role in cell hemostasis and requires further study.
authors.affiliation: Manitoba Institute of Cell Biology, Winnipeg, Canada. khajuria@cc.umanitoba.ca
authors.forename: A
authors.initials: A
authors.lastname: Khajuria
authors.forename: R K
authors.initials: RK
authors.lastname: Johrn
authors.forename: U
authors.initials: U
authors.lastname: Zutshi
mesh_terms: D000284:Administration, Oral; D000470:Alkaloids; D000818:Animals; D052117:Benzodioxoles; D004847:Epithelial Cells / Q000187:drug effects* / Q000378:metabolism*; D005609:Free Radicals / Q000378:metabolism; D007413:Intestinal Mucosa / Q000187:drug effects* / Q000378:metabolism*; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D010880:Piperidines / Q000008:administration & dosage / Q000633:toxicity*; D053284:Polyunsaturated Alkamides; D051381:Rats; D013438:Sulfhydryl Compounds / Q000378:metabolism*; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D000470:Alkaloids; D052117:Benzodioxoles; D005609:Free Radicals; D010880:Piperidines; D053284:Polyunsaturated Alkamides; D013438:Sulfhydryl Compounds; D017392:Thiobarbituric Acid Reactive Substances; C008922:piperine