Validation of 8-isoprostane and prostaglandin E(2) measurements in exhaled breath condensate

To qualitatively validate radioimmunoassays for 8-isoprostane and prostaglandin (PG) E(2) in exhaled breath condensate. Twenty-two subjects with different lung diseases attended the outpatient clinic on one occasion for exhaled breath condensate collection. Samples were pooled together and purified...

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Bibliographic Details
Published in:Inflammation research 2003-12, Vol.52 (12), p.502-507
Main Authors: Montuschi, P, Ragazzoni, E, Valente, S, Corbo, G, Mondino, C, Ciappi, G, Ciabattoni, G
Format: Article
Language:English
Subjects:
Breath Tests - methods
Chromatography, High Pressure Liquid
Dinoprostone - analysis
Dinoprostone - blood
Female
Humans
Isoprostanes - analysis
Isoprostanes - blood
Lung Diseases - blood
Lung Diseases - diagnosis
Lung Diseases - metabolism
Male
Middle Aged
Radioimmunoassay
Reproducibility of Results
Respiration
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Summary:To qualitatively validate radioimmunoassays for 8-isoprostane and prostaglandin (PG) E(2) in exhaled breath condensate. Twenty-two subjects with different lung diseases attended the outpatient clinic on one occasion for exhaled breath condensate collection. Samples were pooled together and purified by reverse phase high performance liquid chromatography (RP-HPLC). The eluted fractions were assayed for 8-isoprostane-like immunoreactivity and PGE(2)-like immunoreactivity by radioimmunoassays. In addition, simultaneous measurements of exhaled breath condensate unextracted samples with two anti-8-isoprostane and anti-PGE(2) sera with different cross-reactivity were performed. A single peak of 8-isoprostane-like immunoreactivity and PGE(2)-like immunoreactivity co-eluting with 8-isoprostane (retention time: 13 min) and PGE(2) (retention time: 21 min) standards, respectively, was identified by radioimmunoassays. Testing with two different antisera showed similar results for both 8-isoprostane-like immunoreactivity (limits of agreement = 4.5 pg/ml and - 4.1 pg/ml, n = 12) and PGE(2)-like immunoreactivity (limits of agreement = 6.1 pg/ ml and - 6.1 pg/ml, n = 12). This study provides evidence for the specificity of the radioimmunoassays for 8-isoprostane and PGE(2) in exhaled breath condensate. This is critical for proposing these markers as a non-invasive way for monitoring airway inflammation.
ISSN:1023-3830