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[Role of the endothelium in leukocyte trafficking].

Vascular endothelium controls leukocyte recirculation and recruitment, receiving messages from underlying tissues and transforming them into informations quickly read by the passaging leukocytes. These messages induce adhesive interactions between leukocytes and endothelium via adhesion molecules. Multiple receptor-ligand pairs function in 4 steps: initial tethering and rolling of leukocytes; leukocyte triggering by chemotactic factors; arrest and strong adhesion to endothelium; and ultimately transendothelial migration (diapedesis).