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Functional Adaptation of Bovine Mesenteric Lymphatic Vessels to Mesenteric Venous Hypertension

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AJP Regulatory Integrative and Comparative Physiology

Published online on

Abstract

Lymph flow is the primary mechanism for returning interstitial fluid to the blood circulation. Currently, the adaptive response of lymphatic vessels to mesenteric venous hypertension is not known. This study sought to determine the functional responses of post-nodal mesenteric lymphatic vessels. We surgically occluded bovine mesenteric veins to create mesenteric venous hypertension to elevate mesenteric lymph flow. Three days after surgery, post-nodal mesenteric lymphatic vessels from mesenteric venous hypertension (MVH; n=7) and sham surgery (SHAM; n=6) group animals were evaluated and compared. Contraction frequency (MVH: 2.98±0.75 min-1; SHAM: 5.42±0.81 min-1) and fractional pump flow (MVH: 1.14±0.30 min-1; SHAM: 2.39±0.32 min-1) were significantly lower in the venous occlusion group. These results indicate that post-nodal mesenteric lymphatic vessels adapt to mesenteric venous hypertension by reducing intrinsic contractile activity.