title: Studies on antioxidant properties of polyphenol-rich extract from berries of Aronia melanocarpa in blood platelets.
abstract: The antioxidant properties of extract from berries of Aronia melanocarpa (chokeberry) containing: anthocyanidines, phenolic acids and quercetine glycosides on oxidative/nitrative stress induced by peroxynitrite (ONOO(-), a powerful physiological oxidant, nitrating species and inflammatory mediator) in human blood platelets were studied in vitro. The extract from A. melanocarpa (5 - 50 microg/mL) significantly inhibited platelet protein carbonylation (measured by ELISA method) and thiol oxidation estimated with 5,5'-dithio-bis(2-nitro-benzoic acid) (DTNB) induced by peroxynitrite (0.1 mM) (IC(50)--35 microg/mL for protein carbonylation, and IC(50)--33 microg/mL for protein thiol oxidation). The tested extract only slightly reduced platelet protein nitration (measured by C- ELISA method). The extract also caused a distinct reduction of platelet lipid peroxidation induced by peroxynitrite. Moreover, in our preliminary experiments we observed that the extract (50 microg/mL) reduced oxidative/nitrative stress in blood platelets from patients with breast cancer. The obtained results indicate that in vitro the extract from A. melanocarpa has the protective effects against peroxynitrite-induced oxidative/nitrative damage to the human platelet proteins and lipids. The extract from A. melanocarpa seems to be also useful as an antioxidant in patients with breast cancer.
authors.affiliation: Department of General Biochemistry, University of Lodz, Poland. olasb@biol.uni.lodz.pl
authors.forename: B
authors.initials: B
authors.lastname: Olas
authors.forename: B
authors.initials: B
authors.lastname: Wachowicz
authors.forename: P
authors.initials: P
authors.lastname: Nowak
authors.forename: M
authors.initials: M
authors.lastname: Kedzierska
authors.forename: A
authors.initials: A
authors.lastname: Tomczak
authors.forename: A
authors.initials: A
authors.lastname: Stochmal
authors.forename: W
authors.initials: W
authors.lastname: Oleszek
authors.forename: A
authors.initials: A
authors.lastname: Jeziorski
authors.forename: J
authors.initials: J
authors.lastname: Piekarski
mesh_terms: D000293:Adolescent; D000328:Adult; D000975:Antioxidants / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D001943:Breast Neoplasms / Q000188:drug therapy / Q000473:pathology; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005419:Flavonoids / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D005638:Fruit; D006801:Humans; D066298:In Vitro Techniques; D020128:Inhibitory Concentration 50; D015227:Lipid Peroxidation / Q000187:drug effects; D018384:Oxidative Stress; D010636:Phenols / Q000008:administration & dosage / Q000302:isolation & purification / Q000494:pharmacology*; D046936:Photinia / Q000737:chemistry*; D010936:Plant Extracts / Q000494:pharmacology; D059808:Polyphenols; D055815:Young Adult
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols