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The Journal of Immunology, Vol 145, Issue 8 2588-2594, Copyright © 1990 by American Association of Immunologists

ARTICLES

Distinct adhesive properties of granulocytes and monocytes to endothelial cells under static and stirred conditions

TW Kuijpers, BC Hakkert, JA van Mourik and D Roos
Central Laboratory, The Netherlands Red Cross Blood Transfusion Service, Amsterdam.

Adherence of neutrophils and monocytes to endothelium is an important event in the sequence of leukocyte responses to inflammatory disease. Double-color flow microfluorimetry analysis was used to determine neutrophil and monocyte adherence to suspended endothelial cells under stirred conditions. The static adherence to endothelial cell monolayers was simultaneously determined. In both assays, neutrophils behaved in a similar way. Basal adherence of neutrophils was very low. Activation by PMA or by the chemoattractants platelet-activating factor and FMLP induced rapid binding, primarily mediated by CR3. Nonactivated neutrophils showed CD18-dependent (lymphocyte function-associated Ag-1 and CR3) and CD18-independent adherence to endothelial cells when the endothelial cells were prestimulated with rIL-1 beta. In contrast to neutrophils, nonactivated monocytes adhered avidly to resting endothelial cells. This adherence was partly CD18 dependent and partly CD18 independent. Whereas monocyte adherence under stirred conditions strongly increased upon activation by PMA, a significant decrease in adherence was found under static conditions, which was prevented by cytochalasin B. This decrease was limited to a distinct CD18- independent binding mechanism, and absent under stirred conditions. We conclude that monocytes adhere with (at least) three binding mechanisms to endothelial cells, a CD18-dependent and two CD18-independent mechanisms.


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