Abstract
Eosinophil-derived neurotoxin/protein X (EDN/EPX), one of the cationic granule proteins released by polymorphonuclear eosinophils, can be detected in human urine. We sought to evaluate whether the urinary release of EDN/EPX was dependent on the blood eosinophil cell count, the bronchoalveolar eosinophil cell count, or both and on the clinical diagnosis. We also attempted to determine the precise kinetics of decrease of EDN excretion and eosinophil counts after the onset of corticosteroid treatment. Daily urinary release of EDN/EPX was measured by radioimmunoassay in 28 patients with high hypereosinophilia (group 1), 32 patients with moderate hypereosinophilia (group 2), 26 patients without hypereosinophilia at the time of the study but with a known pulmonary disease involving eosinophils (group 3), and 13 control patients (group 4). The urinary excretion of EDN/EPX was significantly higher in patients from groups 1 or 2 than in patients from groups 3 or 4. Particularly high levels of EDN/EPX excretion were observed in patients from groups 1 or 2 with chronic eosinophilic pneumonia (chronic eosinophilic pneumonia: 4.7 +/- 8.1 mg/day, control subjects: 0.39 +/- 0.33 mg/day, p < 0.001). Urinary excretion of EDN/EPX was significant...Continue Reading
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