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Journal of Applied Physiology, Vol 67, Issue 3 959-962, Copyright © 1989 by American Physiological Society
ARTICLES |
D. L. Emery, T. D. Djokic, P. D. Graf and J. A. Nadel
Cardiovascular Research Institute, University of California, San Francisco 94143-0130.
Prostaglandin D2 (PGD2), the major product of arachidonic acid metabolism via the cyclooxygenase pathway in most mast cells, is present in the airways of atopic asthmatic patients after antigen challenge. Because eosinophilia is characteristic of asthma, we asked whether PGD2 causes eosinophils to accumulate in the airways in vivo. Using an endotracheal tube with two inflatable balloons we isolated a segment of trachea in four anesthetized mechanically ventilated dogs, and we superfused this segment with either a control solution (Hanks' balanced salt solution and antibiotics) or solution containing PGD2 (10(-6) M). Total and differential cell counts were determined at base line and every hour for 4 h during the study. PGD2 caused eosinophil accumulation in the trachea [7.0 +/- 3.4, 28.7 +/- 17.8, 33.7 +/- 13.6, and 35.4 +/- 10.7 (SD) cells/cm2 trachea after 1, 2, 3, and 4 h, respectively, P less than 0.05 vs. controls] but had no significant effect on neutrophil accumulation. The effect of PGD2 on eosinophil accumulation was significantly inhibited by the prostaglandin receptor antagonist SKF 88046 (5 mg/kg iv). We conclude that PGD2 is a selective stimulus that causes accumulation of eosinophils in the tracheal lumen of dogs in vivo.
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