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Am. J. Respir. Crit. Care Med., Volume 160, Number 6, December 1999, 1905-1909

Induced Sputum Eicosanoid Concentrations in Asthma

IAN D. PAVORD, RICHARD WARD, GERRIT WOLTMANN, ANDREW J. WARDLAW, JAMES R. SHELLER, and RYSZARD DWORSKI

Department of Respiratory Medicine and Thoracic Surgery, Glenfield Hospital, Leicester, United Kingdom, and Vanderbilt University School of Medicine, Nashville, Tennessee

Further definition of the role of leukotrienes (LT) and prostaglandins (PG) in asthma would be helped by a noninvasive method for assessing airway production. The supernatant from sputum induced with hypertonic saline and dispersed using dithiotrietol has been successfully used to measure other molecular markers of airway inflammation and might be a useful method. We have measured induced sputum supernatant LTC4/D4/E4 concentrations using enzyme immunoassay and PGE2, PGD2, TXB2, and PGF2alpha using gas chromatography-negative ion chemical ionization-mass spectroscopy in 10 normal subjects and in 26 subjects with asthma of variable severity. Sputum cysteinyl-leukotrienes concentrations were significantly greater in subjects with asthma (median, 9.5 ng/ml) than in normal control subjects (6.4 ng/ml; p < 0.02) and greater in subjects with persistent asthma requiring inhaled corticosteroids (median, 11.4 ng/ml) or studied within 48 h of an acute severe exacerbation of asthma (13 ng/ml) than in subjects with episodic asthma treated with inhaled beta 2-agonists only (7.2 ng/ml). There were no significant differences in the concentrations of other eicosanoids between groups, although there was a negative correlation between the percentage sputum eosinophil count and sputum PGE2 concentration (r = -0.48; p < 0.01) in subjects with asthma. We conclude that induced sputum contains high concentrations of eicosanoids and that sputum LTC4/D4/E4 concentrations are significantly greater in subjects with asthma than in normal subjects. The inverse relationship between eosinophilic airway inflammation and sputum PGE2 concentration would be consistant, with the latter having an anti-inflammatory role. Pavord ID, Ward R, Woltmann G, Wardlaw AJ, Sheller JR, Dworski R. Induced sputum eicosanoid concentrations in asthma.




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