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- W2024402718 abstract "Abstract Glycoprotein VI (GPVI) mediates platelet activation on exposed subendothelial collagens at sites of vascular injury and thereby contributes to normal hemostasis, but also to the occlusion of diseased vessels in the setting of myocardial infarction or stroke. GPVI is an attractive target for antithrombotic therapy, particularly because previous studies have shown that anti-GPVI antibodies induce irreversible down-regulation of the receptor in circulating platelets by internalization and/or ectodomain shedding. Metalloproteinases of the a disintegrin and metalloproteinase (ADAM) family have been proposed to mediate this ectodomain shedding, but direct evidence for this is lacking. Here, we studied GPVI shedding in vitro and in vivo in newly generated mice with a megakaryocyte–specific ADAM10 deficiency and in Adam17ex/ex mice, which lack functional ADAM17. We demonstrate that GPVI cleavage in vitro can occur independently through either ADAM10 or ADAM17 in response to distinct stimuli. In contrast, antibody (JAQ1)–induced GPVI shedding in vivo occurred in mice lacking both ADAM10/ADAM17 in their platelets, suggesting the existence of a third GPVI cleaving platelet enzyme. This was supported by in vitro studies on ADAM10/ADAM17 double–deficient platelets. These results reveal that ectodomain shedding of GPVI can be mediated through multiple differentially regulated platelet–expressed proteinases with obvious therapeutic implications." @default.
- W2024402718 created "2016-06-24" @default.
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- W2024402718 date "2010-10-28" @default.
- W2024402718 modified "2023-10-14" @default.
- W2024402718 title "Differentially regulated GPVI ectodomain shedding by multiple platelet–expressed proteinases" @default.
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- W2024402718 doi "https://doi.org/10.1182/blood-2010-06-289108" @default.
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