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Journal of Cell Science, Vol 107, Issue 9 2449-2457, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
G Kaplanski, C Farnarier, AM Benoliel, C Foa, S Kaplanski and P Bongrand
INSERM U 387, Hopital de Sainte-Marguerite, Marseille, France.
The migration of neutrophils from blood vessels to peripheral tissues is a key step of inflammation. This requires the formation of transient gaps between endothelial cells with concomitant leucocyte squeezing through these narrow apertures and immediate restoration of endothelium continuity. It is currently considered that the main role of selectins is to mediate the initial contact between flowing leucocytes and endothelial cells. We show here that the binding of E- or P-selectins by specific antibodies induces a marked 'rounding up' of interleukin-1- or thrombin-activated human endothelial cells, respectively. Also, anti-E-selectin antibodies trigger a transient increase in cytosolic calcium involving intracellular calcium stores. No such effect is observed when von Willebrand factor or intercellular adhesion molecule 1 are similarly bound. Thus, in addition to promoting the initial interaction between activated endothelium and moving leucocytes, selectins might play a role in the induction of subsequent endothelial deformation, which would facilitate leucocyte arrest and transmigration towards peripheral tissues, and enhance the diffusion of soluble molecules between intravascular and peripheral compartments. Our results are consistent with this hypothesis and demonstrate a new property of endothelial selectins.
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