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The reversible aggregation of red blood cells (RBCs) is a process oferythrocytes clumping that strongly influences the rheological properties ofblood. The adhesion of RBCs has been studied extensively in the frame ofcell-to-cell interaction induced by dextran macromolecules, whereas the data islacking for native plasma solution. We apply optical tweezers to investigatethe induced adhesion of RBCs in plasma and in dextran solution. Two hypotheses'cross-bridges' and 'depletion layer' are being utilized to describe themechanism of cells interaction, while both need to be confirmed experimentally.The results show that in dextran solution the interaction of adhering RBCsagrees well with the quantitative predictions obtained on the basis of adepletion-induced cells adhesion model, whereas a migrating 'cross-bridge'model is more appropriate for plasma. Furthermore, the 'cross-bridge' mechanismis confirmed by direct visualization of red blood cells adhesion utilizingscanning electron microscopy (SEM).

Cross-Bridge Induced Adhesion of Red Blood Cells Assessed by Optical Tweezers