K Sladek, R Dworski, J Soja, JR Sheller, E Nizankowska, JA Oates and A Szczeklik
Department of Medicine, University School of Medicine, Cracow, Poland.

We have recently shown that oral aspirin provocation leads to an increase in LTE4 and a reduction in 11-dehydro-TXB2 levels in urine of patients with aspirin induced-asthma (AIA). To test the hypothesis that cyclooxygenase inhibition and an enhancement of cysteinyl-leukotriene production occurs in the lungs of patients with AIA, we examined the eicosanoid levels in bronchoalveolar lavage fluid obtained 30 min after lysine-aspirin or placebo inhalation in 10 patients with AIA. Eosinophil cationic protein (ECP) levels were determined to evaluate eosinophil activation. Six asthmatics nonsensitive to aspirin (NA) underwent challenge with placebo. The dose of lysine-aspirin inhaled by patients with AIA was equal to that which had produced > or = 20% fall in FEV1. Compared with NA, patients with AIA had: (1) eicosanoid levels, particularly PGE2 and TXB2, elevated and (2) higher number of eosinophils and ECP. The overproduction of eicosanoids could be related to a distinct eosinophilic inflammation in airways of patients with AIA. Inhalation of lysine-aspirin had no effects on 12-HETE and 15-HETE levels, but it markedly depressed cyclooxygenase products and significantly enhanced leukotriene production in the lungs of patients with AIA.

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