Morrell, C. N. et al. Glutamate mediates platelet activation through the AMPA receptor.
In preclinical and Phase I - II studies, inhibition of thrombin-mediated platelet activation by a PAR-1 inhibitor, in general, has added to the antithrombotic efficacy of aspirin and clopidogrel without increasing bleeding.
Thrombin, a strong platelet agonist, cleaves Dab2 in its PTB domain; thus, Dab2 could be proteolyzed during thrombin-mediated platelet activation [9].
To examine the role of Dab2-sulfatide binding in the context of thrombin-mediated platelet activation, N-PTB was pre-incubated with sulfatide liposomes and protein-lipid complexes were treated with thrombin.
In contrast, PtdIns(4,5 P2 was unable to protect N-PTB from thrombin cleavage (Fig. 3D), indicating that the phosphoinositide does not have a direct role in Dab2 stabilization during thrombin-mediated platelet activation.
Our studies show the involvement of FcγRIIA in mediating platelet activation in the presence ACPA.
Collagen interacts directly with platelets via glycoprotein VI (GpVI), which mediates platelet activation, and integrin α2β1, which supports platelet adhesion to collagen.
CD9 is a tetraspanin family member that makes complexes with integrins and other tetraspanins, modulates cell adhesion and migration and also mediates platelet activation and aggregation.
This is in line with findings reported by Leytin and colleagues [ 33] showing that the pro-inflammatory cytokines IL-1β, IL-6, and IL-8 did not stimulate platelets and failed to promote thrombin-mediated platelet activation.
This receptor subtype is also highly expressed in human platelets, and pharmacological evidence of its preference for 1-O-alkyl glycerophosphate suggests that it mediates platelet activation (Williams et al., 2009).
