Document Detail

Exhaled leukotrienes and prostaglandins in asthma.
MedLine Citation:
PMID:  11941309     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Most of the studies investigating the role of leukotrienes (LTs) and prostaglandins (PGs) in asthma have used invasive (eg, bronchoalveolar lavage fluid) or semi-invasive (eg, sputum induction) techniques. Others have measured eicosanoids in plasma or urine, probably reflecting systemic rather than lung inflammation. Collection of exhaled breath condensate (EBC) is a noninvasive method to collect airway secretions. OBJECTIVE: We sought to investigate whether eicosanoids are measurable in EBC, to show possible differences in their concentrations in asthmatic patients and healthy subjects, and to investigate whether exhaled eicosanoids correlate with exhaled nitric oxide (NO), a marker of airway inflammation. METHODS: Twelve healthy nonsmokers and 15 steroid-naive patients with mild asthma were studied. Subjects attended on one occasion for pulmonary function tests, collection of EBC, and exhaled NO measurements. Exhaled LTB(4)-like immunoreactivity, LTE(4)-like immunoreactivity, PGE(2)-like immunoreactivity, PGD(2)-methoxime, PGF(2)(alpha)-like immunoreactivity, and thromboxane B(2)-like immunoreactivity were measured by means of enzyme immunoassays. RESULTS: LTE(4)-like immunoreactivity and LTB(4)-like immunoreactivity were detectable in EBC in healthy subjects, and their levels in asthmatic patients were increased about 3-fold (P <.0001) and 2-fold (P <.0005), respectively. Exhaled NO was increased in asthmatic patients compared with healthy subjects (P <.0001). There was a correlation between exhaled LTB(4) and exhaled NO (r = 0.56, P <.04) in patients with asthma. When measurable, prostanoid levels were similar in asthmatic patients and control subjects. CONCLUSIONS: Exhaled LTE(4) and LTB(4) are increased in steroid-naive patients with mild asthma. EBC may be proved to be a novel method to monitor airway inflammation in asthma.
Paolo Montuschi; Peter J Barnes
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of allergy and clinical immunology     Volume:  109     ISSN:  0091-6749     ISO Abbreviation:  J. Allergy Clin. Immunol.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-04-09     Completed Date:  2002-05-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1275002     Medline TA:  J Allergy Clin Immunol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  615-20     Citation Subset:  AIM; IM    
Department of Pharmacology, School of Medicine, Catholic University of the Sacred Heart, Rome, Italy.
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MeSH Terms
Asthma / diagnosis,  metabolism*,  physiopathology
Breath Tests*
Cross-Sectional Studies
Leukotriene B4 / analysis,  metabolism*
Leukotriene E4 / analysis,  metabolism*
Lung / physiopathology
Nitric Oxide / analysis,  metabolism
Prostaglandins / analysis,  metabolism*
Reg. No./Substance:
0/Prostaglandins; 10102-43-9/Nitric Oxide; 71160-24-2/Leukotriene B4; 75715-89-8/Leukotriene E4

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