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The role of platelet glucose-6-phosphate dehydrogenase (G-6-PD) in mediating the effects of human platelets on oxidant-induced edema in the isolated perfused rabbit lung was investigated using dehydroepiandrosterone, a specific steroidal inhibitor of G-6-PD. Xanthine oxidase (0.003 and 0.012 U/ml) caused lung edema that was attenuated by coinfusion of washed human platelets. Platelets that were incubated with DEA to inhibit G-6-PD activity augmented xanthine oxidase-induced lung edema and pulmonary hypertension at both doses of xanthine oxidase. Infusion of papaverine to maintain stable pulmonary artery (PA) pressures, incubation of G-6-PD-inhibited platelets with acetylsalicylate, or infusion of a thromboxane-prostaglandin endoperoxide receptor site antagonist, SQ 29548, into the lung perfusate prevented augmentation of lung edema and the PA pressor response by G-6-PD-inhibited platelets. It was concluded that antioxidant-intact platelets attenuate oxidant-induced lung edema by preventing increased membrane permeability, and that G-6-PD-inhibited platelets augment lung edema through hydrostatic mechanisms mediated by release of platelet cyclooxygenase products.

Human platelets modulate edema formation in isolated rabbit lungs.