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Am J Physiol Lung Cell Mol Physiol 279: L496-L502, 2000;
1040-0605/00 $5.00
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Vol. 279, Issue 3, L496-L502, September 2000

The PDE inhibitor zaprinast enhances NO-mediated protection against vascular leakage in reperfused lungs

Hartwig Schütte, Martin Witzenrath, Konstantin Mayer, Norbert Weissmann, Alexander Schell, Simone Rosseau, Werner Seeger, and Friedrich Grimminger

Department of Internal Medicine, Justus-Liebig University, 35385 Giessen, Germany

Disruption of endothelial barrier properties with development of noncardiogenic pulmonary edema is a major threat in lung ischemia-reperfusion (I/R) injury that occurs under conditions of lung transplantation. Inhaled nitric oxide (NO) reduced vascular leakage in lung I/R models, but the efficacy of this agent may be limited. We coadministered NO and zaprinast, a cGMP-specific phosphodiesterase inhibitor, to further augment the NO-cGMP axis. Isolated, buffer-perfused rabbit lungs were exposed to 4.5 h of warm ischemia. Reperfusion provoked a transient elevation in pulmonary arterial pressure and a negligible rise in microvascular pressure followed by a massive increase in the capillary filtration coefficient and severe lung edema formation. Inhalation of 10 parts/million of NO or intravascular application of 100 µM zaprinast on reperfusion both reduced pressor response and moderately attenuated vascular leakage. Combined administration of both agents induced no additional vasodilation at constant microvascular pressures, but additively protected against capillary leakage paralleled by a severalfold increase in perfusate cGMP levels. In conclusion, combining low-dose NO inhalation and phosphodiesterase inhibition may be suitable for the maintenance of graft function in lung transplantation by amplifying the beneficial effect of the NO-cGMP axis and avoiding toxic effects of high NO doses.

phosphodiesterase; nitric oxide; lung transplantation; cyclic nucleotides; microvascular permeability


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