CD40L stabilizes arterial thrombi by a beta3 integrin--dependent mechanism - PubMed (original) (raw)
CD40L stabilizes arterial thrombi by a beta3 integrin--dependent mechanism
Patrick André et al. Nat Med. 2002 Mar.
Abstract
CD40L, a member of the tumor necrosis factor family of ligands, plays a major role in immune responses via its receptor, CD40. Recently, CD40L has been detected on the surfaces of activated platelets and shown to activate endothelium. Here we further addressed the function of platelet CD40L. We show that absence of CD40L affects the stability of arterial thrombi and delays arterial occlusion in vivo. Infusion of recombinant soluble (rs)CD40L restored normal thrombosis, whereas rsCD40L lacking the KGD integrin-recognition sequence did not. CD40-deficient mice exhibited normal thrombogenesis. rsCD40L specifically bound to purified integrin alphaIIbbeta3 and to activated platelets in a beta3-dependent manner and induced platelet spreading. In addition, rsCD40L promoted the aggregation of either human or mouse platelets under high shear rates. Thus, CD40L appears to be an alphaIIbbeta3 ligand, a platelet agonist, and necessary for stability of arterial thrombi.
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