Key result
L-NIO inhibited pulmonary vasodilator responses to acetylcholine, bradykinin, and substance P without significantly affecting baseline lobar arterial pressure at lower doses in cats.
Why the study?
Does L-NIO alter baseline tone and endothelium-dependent vasodilator responses in the pulmonary vascular bed of the cat?
Population
Cats (pulmonary vascular bed under constant-flow conditions)
Comparison
L-N5--ornithine administered intravenously in… vs Baseline responses and other NO synthesis…
Design
Preclinical
Authors
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L-NIO selectively blocks endothelium-dependent pulmonary vasodilation in cats; extends NO pathway mapping in animal models but leaves open human translation.
Does L-NIO alter baseline tone and endothelium-dependent vasodilator responses in the pulmonary vascular bed of the cat?
The study demonstrates that the effects of L-NIO on endothelium-dependent vasodilator responses and baseline tone can be separated, suggesting basal NO release does not play a major role in maintaining baseline tone in the feline pulmonary vascular bed.
DeWitt et al. (1997) studied this question. L-N5-(1-iminoethyl)-ornithine (L-NIO) was evaluated on pulmonary vasodilator responses and baseline lobar arterial pressure. L-NIO inhibited pulmonary vasodilator responses to acetylcholine, bradykinin, and substance P without significantly affecting baseline lobar arterial pressure at lower doses in cats.
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