Journal of Applied Physiology AJP: Regulatory, Integrative and Comparative Physiology
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J Appl Physiol 62: 1808-1813, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 62, Issue 5 1808-1813, Copyright © 1987 by American Physiological Society

ARTICLES

Leukotriene inhibitors do not block hypoxic pulmonary vasoconstriction in dogs

D. P. Schuster and D. R. Dennis

We studied whether intravenously administered inhibitors of leukotriene synthesis (diethylcarbamazine, DEC) or end-organ effect (FPL-55712) would change the distribution of regional pulmonary blood flow (rPBF) caused by left lower lobe (LLL) alveolar hypoxia in dogs. Both drugs failed to alter rPBF. In addition, the pressor response to whole-lung hypoxia was not blocked by an FPL-55712 infusion. On the other hand, nitroprusside, as a nonspecific vasodilator also administered intravenously, was able to partially reverse the effects of LLL hypoxia on rPBF. Thus our data do not support a role for leukotriene mediation of hypoxic pulmonary vasoconstriction in dogs.


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