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• W1556933923 endingPage "2138" @default.
• W1556933923 startingPage "2131" @default.
• W1556933923 abstract "Abstract The adhesion of neutrophils (polymorphonuclear leukocytes [PMNs]) to immobilized fibrinogen/fibrin is mediated by β2-integrins. However, the influence of physiologic flow conditions on neutrophil adhesion to these surfaces is poorly defined. In this report, the effect of flow and neutrophil activation on adhesion to immobilized fibrinogen and fibrin was examined. For the evaluation of (the distribution of ) neutrophil adhesion, real-time video-assisted microscopy and custom-made software were used. Under flow conditions, adherent neutrophils appeared to support the subsequent margination of other neutrophils, thereby enhancing the adherence of these cells to fibrin. Consequently, neutrophils adhered in clusters, especially at higher shear stresses (eg, cluster index 1.4 at shear 80 mPa). Preactivation of PMNs with fMLP (10−7 mol/L) or 4β-phorbol, 12-myristate, 13-acetate (PMA; 100 ng/mL) resulted in approximately 50% inhibition of adhesion to fibrin and a more random distribution (cluster index <0.5). L-selectin antibodies or neuraminidase treatment of PMNs also inhibited adhesion and clustering, indicating a role for L-selectin. Under static conditions, no clustering appeared and PMN activation with fMLP or PMA caused threefold and sevenfold increased adhesion, respectively. Under these conditions, anti–L-selectin antibodies or neuraminidase did not affect adhesion. These results indicate that, under flow conditions, adherent neutrophils support adhesion of flowing neutrophils by L-selectin–mediated cell-cell interactions. Preactivated neutrophils, with lowered L-selectin expression, are less susceptible for this interaction. By this mechanism, adhered leukocytes can modulate the recruitment of leukocytes to the vessel wall at sites of inflammation." @default.
• W1556933923 created "2016-06-24" @default.
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• W1556933923 date "1997-03-15" @default.
• W1556933923 modified "2023-10-03" @default.
• W1556933923 title "Neutrophil Adhesion to Fibrinogen and Fibrin Under Flow Conditions Is Diminished by Activation and L-Selectin Shedding" @default.
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• W1556933923 doi "https://doi.org/10.1182/blood.v89.6.2131" @default.
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