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Journal of Applied Physiology, Vol 74, Issue 6 3040-3045, Copyright © 1993 by American Physiological Society
ARTICLES |
C. M. Doerschuk, N. Beyers, H. O. Coxson, B. Wiggs and J. C. Hogg
Pulmonary Research Laboratory, University of British Columbia, Vancouver, Canada.
Neutrophils [polymorphonuclear leukocytes (PMNs)] are sequestrated in the lung capillary bed because PMNs are delayed with respect to red blood cells (RBCs) as they pass through these microvessels. The present study examines circulating PMN size in relation to the distribution of capillary segment diameters in human, dog, and rabbit lungs and compares the shape of PMNs in suspension to that found within the pulmonary capillaries. The data show that 61, 67, and 38% of the capillary segments are narrower than the mean diameter of spherical PMNs in the rabbit, dog, and human, respectively. They also show that PMNs deform from a spherical to an ellipsoid shape in the pulmonary capillaries of all three species. These findings are consistent with previous studies showing that the pulmonary circulation restricts the passage of PMNs through the lungs and suggest that PMNs are delayed because they must deform to pass through restrictions encountered in the pulmonary capillary bed. We conclude that the discrepancy between PMN and pulmonary capillary size and the decreased deformability of PMNs with respect to RBCs are major determinants of the delay that PMNs experience with respect to RBCs in the pulmonary circulation.
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