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Endothelial cell interactions with sickle cell, sickle trait, mechanically
injured, and normal erythrocytes under controlled flow
GA Barabino, LV McIntire, SG Eskin, DA Sears and M Udden
Increased adhesive forces between sickle erythrocytes and endothelial cells
(EC) have been hypothesized to play a role in the initiation of
vasoocclusion in sickle cell anemia. Erythrocyte/human umbilical vein EC
interactions were studied under controlled flow conditions for normal (AA),
homozygous sickle cell (SS), sickle cell trait (AS), mechanically injured
normal, and "high-reticulocyte control" RBC by using video microscopy and
digital image processing. The number of adherent RBC was determined at
ten-minute intervals during a washout period. Results indicate that SS RBC
were more adherent than AA RBC. Mechanically injured (sheared) AA RBC were
also more adherent than control normal cells but less adherent than SS RBC.
AS RBC did not differ significantly in their adhesive properties from
normal RBC. Less- dense RBC were more adherent to EC than dense cells for
normal, SS, and high-reticulocyte control RBC. The number of cells adherent
at a given time during washout was a very strong function of wall shear
rate. In addition, at all shear rates studied, the average velocity of
individual SS RBC in the region near the EC surface was approximately half
that of AA RBC at the same bulk volumetric flow rate through the flow
chamber. These findings suggest that the increased adhesion of sickle RBC
is at least partially related to the increased numbers of less-dense RBC
present. Increased adherence of the less-dense cells to the EC lining
vessel walls could contribute to microvascular occlusion by lengthening
vascular transit times of other sickle cells.
Volume 70,
Issue 1,
pp. 152-157,
07/01/1987
Copyright © 1987 by The American Society of Hematology

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