title: Increased exhaled cysteinyl-leukotrienes and 8-isoprostane in aspirin-induced asthma.
abstract: The pathogenesis of aspirin-induced asthma (AIA) has not yet been clearly elucidated, although eicosanoid metabolites appear to play an important role. We hypothesized that levels of eicosanoids in exhaled air condensate are abnormal in patients with AIA and that they change in patients receiving steroid therapy. We measured cysteinyl-leukotrienes (cys-LTs), prostaglandin E(2) (PGE(2)), and leukotriene B(4) (LTB(4)), and also 8-isoprostane as a marker of oxidative stress, by enzyme immunoassay in exhaled breath condensate from patients with AIA (17 steroid naive; mean age, 41 +/- 23 years; FEV(1), 63%pred), 26 patients with aspirin-tolerant asthma (ATA) (11 steroid naive; mean age, 47 +/- 18 years; FEV(1), 69%pred), and 16 healthy subjects (mean age, 45 +/- 17 years; FEV(1), 93%pred). Cys-LTs were significantly higher in steroid-naive patients with AIA compared with steroid-naive patients with ATA and healthy subjects (152.3 +/- 30.4 and 36.6 +/- 7.1 versus 19.4 +/- 2.8 pg/ml; p < 0.05 and p < 0.05, respectively). Steroid-naive patients with AIA also had higher levels of 8-isoprostane than normal subjects (131.8 +/- 31.0 versus 21.9 +/- 4.5 pg/ml; p < 0.05). There were significantly lower levels of both cys-LTs and 8-isoprostanes in steroid-treated patients with AIA. There was no difference in either the PGE(2) or LTB(4) level between the patient groups. This is the first study to show that cys-LTs and 8-isoprostanes are elevated in expired breath condensate of steroid-naive patients with AIA, and that cys-LTs are decreased in steroid-treated patients. Exhaled PGE(2) levels are not reduced, so that it is unlikely that a deficiency of PGE(2) is an important mechanism, whereas exhaled LTB(4) levels are unchanged, indicating an abnormality beyond 5-lipoxygenase.
authors.affiliation: Department of Thoracic Medicine, National Heart and Lung Institute, Imperial College, London, UK. magant@kki.net.pl
authors.forename: Adam
authors.initials: A
authors.lastname: Antczak
authors.forename: Paolo
authors.initials: P
authors.lastname: Montuschi
authors.forename: Sergei
authors.initials: S
authors.lastname: Kharitonov
authors.forename: Pawel
authors.initials: P
authors.lastname: Gorski
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Barnes
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000009:adverse effects*; D001241:Aspirin / Q000009:adverse effects*; D001249:Asthma / Q000139:chemically induced* / Q000378:metabolism*; D001944:Breath Tests; D003545:Cysteine / Q000032:analysis*; D015237:Dinoprost / Q000031:analogs & derivatives*; D015232:Dinoprostone / Q000032:analysis; D028441:F2-Isoprostanes / Q000032:analysis*; D005260:Female; D006801:Humans; D018836:Inflammation Mediators / Q000032:analysis*; D007975:Leukotriene B4 / Q000032:analysis; D015289:Leukotrienes / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress / Q000502:physiology; D010120:Oxytocics / Q000032:analysis; D012137:Respiratory System / Q000187:drug effects / Q000378:metabolism*; D014662:Vasoconstrictor Agents / Q000032:analysis*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D028441:F2-Isoprostanes; D018836:Inflammation Mediators; D015289:Leukotrienes; D010120:Oxytocics; D014662:Vasoconstrictor Agents; C112381:cysteinyl-leukotriene; D007975:Leukotriene B4; C075750:8-epi-prostaglandin F2alpha; D015237:Dinoprost; D015232:Dinoprostone; D003545:Cysteine; D001241:Aspirin