Lymph Flow, Shear Stress, and Lymphocyte Velocity in Rat Mesenteric Prenodal Lymphatics

Objective: To measure lymphocyte velocity, lymphatic contraction, and shear stress in phasically contracting lymphatics in situ. Methods: A high-speed video system was used to capture multiple contraction cycles in rat mesenteric lymphatic preparations. The images were analyzed to determine fluid ve...

Full description

Saved in:
Bibliographic Details
Published in:Microcirculation (New York, N.Y. 1994) N.Y. 1994), 2006-10, Vol.13 (7), p.597-610
Main Authors: Dixon, J. B., Greiner, Steven T., Gashev, Anatoliy A., Cote, Gerard L., Moore, James E., Zawieja, David C.
Format: Article
Language:English
Subjects:
Animals
Cell Movement
Lymph - physiology
lymph flow
lymph pump
lymph shear stress
lymphatic
Lymphatic Vessels - physiology
lymphocyte trafficking
Lymphocytes - physiology
Male
Mesentery - anatomy & histology
Mesentery - physiology
Models, Biological
Rats
Rats, Sprague-Dawley
Rheology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Objective: To measure lymphocyte velocity, lymphatic contraction, and shear stress in phasically contracting lymphatics in situ. Methods: A high-speed video system was used to capture multiple contraction cycles in rat mesenteric lymphatic preparations. The images were analyzed to determine fluid velocity, volume flow rate, wall shear stress, and retrograde flow. Results: Lymphocyte density and flux varied from 326 to 35,500 cells/μ L and 206 to 2030 cells/min, respectively. Lymphatics contracted phasically, with a mean diameter 91 ± 9.0 μ m and amplitudes of 39%. Lymph velocity varied with the phasic contractions in both direction and magnitude with an average of 0.87 ± 0.18 and peaks of 2.2-9.0 mm/s. The velocity was ∼ 180° out of phase with the contraction cycle. The average lymph flow was 13.95 ± 5.27 μ L/h with transient periods of flow reversal. This resulted in an average shear of 0.64 ± 0.14 with peaks of 4-12 dynes/cm2. Conclusions: High-speed lymphocyte tracking provided the spatial and temporal resolution to measure lymphocyte flux throughout the phasic contraction. Poiseuille flow was a reasonable model for estimating wall shear stress through most of the phasic contraction cycle of the intervalvular lymphatic segments. Shear rate was low but had large variations in magnitude compared to that seen in blood vessels.
ISSN:1073-9688
1549-8719
DOI:10.1080/10739680600893909