Experimental Physiology
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Experimental Physiology 75.2 pp 255-257
© The Physiological Society 1990
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Experimental Physiology, Vol 75, Issue 2, 255-257
Copyright © 1990 by The Physiological Society

Article

Inhibition of nitric oxide synthesis potentiates hypoxic vasoconstriction in isolated rat lungs

BE Robertson, JB Warren, and PC Nye

We have investigated the influence of endogenous nitric oxide (NO) on the vascular resistance of isolated rat lungs by inhibiting its synthesis with the false substrate N-monomethyl-L-arginine (L-NMMA). When perfused with blood at constant flow the addition of L-NMMA (10(-3) M) did not affect pulmonary arterial pressure in hyperoxia but did increase the response to hypoxia (PO2 25-35 mmHg) by 2.5 +/- 0.2 fold (mean +/- S.E.M.). The effect of L-NMMA was reversed by 3 x 10(-3) M-L-arginine, the true substrate for NO synthesis. Thus NO is an important pulmonary vasodilator but hypoxic vasoconstriction does not result from a reduction of its background release.


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