title: Quercetin inhibits degranulation and superoxide generation in PMA stimulated neutrophils.
abstract: Activated neutrophils represent the main source of myeloperoxidase (MPO), superoxide (SO) and subsequently derived oxygen metabolites. They have important microbicidal activities, however in inflammatory conditions they may secondarily attack surrounding tissues. Overproduction of reactive oxygen species, prolonged or excessive liberation of MPO and other effective yet also toxic substances from neutrophils may participate in disturbed apoptosis, intensify the inflammatory processes and result in serious human diseases. The inhibitory effect of quercetin on PMA stimulated SO generation in isolated human neutrophils was found to be dose-dependent, without affecting the activity of intact isolated neutrophils. At comparable conditions, quercetin was more potent in inhibiting MPO release than SO generation. Our results indicate that quercetin could support resolution of inflammation through decreased activity of neutrophils, i.e. respiratory burst and degranulation.
authors.affiliation: Institute of Experimental Pharmacology & Toxicology, Slovak Academy of Sciences, SK-84104 Bratislava, Slovakia.
authors.forename: Jana
authors.initials: J
authors.lastname: Pečivová
authors.forename: Tatiana
authors.initials: T
authors.lastname: Mačičková
authors.forename: Klára
authors.initials: K
authors.lastname: Sviteková
authors.forename: Radomír
authors.initials: R
authors.lastname: Nosáľ
keywords: myeloperoxidase; neutrophils; quercetin; superoxide generation