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Mediators of Inflammation
Volume 1, Issue 4, Pages 241-246

Neuropeptide modulation of lymphatic smooth muscle tone in the canine forelimb

Department of Physiology, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814-4799, USA

Copyright © 1992 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Neurokinin A and B are putative inflammatory mediators. We assessed their ability to alter prenodal lymphatic resistance. Intralymphatic neurokinin A (3.0 × 10−6, 3.0 × 10−5 and 3.0 × 10−4 mol l−1) significantly constricted lymphatics at the two highest doses. Preliminary experiments suggested that neurokinin B might dilate lymphatics. To test this, lymphatic pressure was increased by norepinephrine (3.1 × 10−6 mol l−1). Neurokinin B (2.7 × 10−4 mol l−1) was then infused intralymphatically during norepinephrine infusion. Norepinephrine increased perfusion pressure from 5.6 ± 0.6 mmHg to 12.1 ± 1.4 mmHg. Subsequent infusion of neurokinin B significantly decreased lymphatic perfusion pressure from 11.9 ± 1.3 mmHg to 9.9 ± 1.1 mmHg. These data indicate that neurokinin A and B can alter lymphatic resistance and are consistent with the hypothesis that lymph vessel function may be subject to modulation by neurokinins.