Escherichia coliinduces platelet aggregation in an FcγRIIa-dependent manner

Cordycepin (3'-deoxyadenosine) inhibits human platelet aggregation in a cyclic AMP- and cyclic GMP-dependent manner.

Cordycepin (3'-deoxyadenosine) is isolated from Cordyceps militaris, a species of the fungal genus Cordyceps. Cordycepin is an ingredient used in traditional Chinese medicine and is prescribed for various diseases, such as cancer and chronic inflammation. In this study, we investigated the novel effect of cordycepin (3'-deoxyadenosine) on collagen-induced human platelet aggregation. Cordycepin ...

Platelet FcγRIIA signaling: new clues for HIT.

In this issue of Blood, Zhou et al provide novel insights into Fc gamma type 2 receptor A (FcgRIIA)–mediated platelet activation. By identifying a negative regulator of FcgRIIA signaling, which is influenced by microRNA miR-148a, they present the first evidence of modulation of platelet function by microRNAs in vivo. They show that inhibition of miR-148a prevents thrombosis after immune complex...

The tyrosine phosphatase 1B regulates LAT phosphorylation and platelet aggregation upon FcγRIIa cross-linking

Platelet 12-LOX is essential for FcγRIIa-mediated platelet activation.

Platelets are essential in maintaining hemostasis following inflammation or injury to the vasculature. Dysregulated platelet activity often results in thrombotic complications leading to myocardial infarction and stroke. Activation of the FcγRIIa receptor leads to immune-mediated thrombosis, which is often life threatening in patients undergoing heparin-induced thrombocytopenia or sepsis. Inhib...

Human platelet activation by Escherichia coli: roles for FcγRIIA and integrin αIIbβ3

Gram-negative Escherichia coli cause diseases such as sepsis and hemolytic uremic syndrome in which thrombotic disorders can be found. Direct platelet-bacterium interactions might contribute to some of these conditions; however, mechanisms of human platelet activation by E. coli leading to thrombus formation are poorly understood. While the IgG receptor FcγRIIA has a key role in platelet respon...