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J Appl Physiol 77: 774-781, 1994;
8750-7587/94 $5.00
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Journal of Applied Physiology, Vol 77, Issue 2 774-781, Copyright © 1994 by American Physiological Society

ARTICLES

Reversal of pulmonary capillary ischemia-reperfusion injury by rolipram, a cAMP phosphodiesterase inhibitor

J. W. Barnard, A. F. Seibert, V. R. Prasad, D. A. Smart, S. J. Strada, A. E. Taylor and W. J. Thompson
Department of Pharmacology, Rush Medical School, Chicago, Illinois 60612.

Isoproterenol (ISO) and forskolin, agents that increase adenosine 3',5'-cyclic monophosphate (cAMP) via adenylyl cyclase activation, reverse lung injury associated with increased microvascular permeability. We studied the role of rolipram, a relatively isozyme-selective cAMP phosphodiesterase (PDE) inhibitor, in reversing increased capillary permeability due to ischemia-reperfusion (I/R), a form of oxidant injury in the lung, by using the isolated perfused rat lung model. Rolipram (2 microM) administered after 45 min of ischemia and 45 min of reperfusion reduced I/R-increased permeability as measured by the capillary filtration coefficient to control lung values. Computer image analysis of air space edema and perivascular cuffing, as well as wet-to-dry weight ratios, confirms the permeability reversal by rolipram administration. Rolipram inhibition of cAMP PDE in the lung was assessed by using [3H]adenine prelabeling adapted for the whole lung and perfusate [3H]cAMP accumulation. Rolipram failed to increase perfusate cAMP alone but dramatically increased perfusate cAMP above ISO alone. Dose-response relationships of ISO or rolipram show a close correlation of the half-maximal effective dose (ED50) for injury reversal and perfusate cAMP production. The combination of rolipram and ISO produced synergistic reversal of I/R injury. We conclude that reversal of I/R-induced increased microvascular permeability can be achieved with rolipram and that the mechanism of action of rolipram is probably through PDE isozyme-selective inhibition. The similarity of the ED50 values for cAMP efflux and reversal of permeability increases also supports a close coupling between cAMP accumulation and endothelial cell permeability.


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