Original Articles
Vol. 2 No. 3 (2023)
Restrained glycoprotein VI-induced platelet signaling by tyrosine protein phosphatases independent of phospholipase Cγ2
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All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.
Received: 18 July 2023
Accepted: 23 September 2023
Accepted: 23 September 2023
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The platelet collagen receptor glycoprotein VI (GPVI) signals to activation of phospholipase Cγ2 (PLCγ2) and phosphoinositide 3-kinases (PI3K), causing platelet activation and aggregation. The non-receptor Src homology tyrosine phosphatases Shp1/2 modulate GPVI signaling in partly opposite ways, both of which are targeted by the potential drug NSC87877. Effect measurements of the Shp1/2 inhibitor NSC87877 on platelet activation via GPVI using light transmission aggregometry, Ca2+ flux assay, western blotting and flow cytometry. Effect measurements of selective PI3K inhibitor TGX221. Inhibition of Shp1/2 with NSC87877 enhanced platelet aggregation induced by the GPVI agonist, collagen-related peptide (CRP). Furthermore, NSC87877 antagonized the effects of PI3Kb inhibition, but not of Btk inhibition. Both NSC87877 and TGX221 suppressed the CRP-induced phosphorylation of PLCγ2 at activation site Tyr759. These findings indicate that drug interference of the two phosphatases Shp1/2 subtly enhances GPVI-induced platelet responses via a mechanism not involving PLCγ2 activation, even upon PI3K inhibition.
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Supporting Agencies
EU Horizon 2020 grant no. 766118How to Cite
1.
Huang J, Fernández DI, Zou J, Wang X, Heemskerk JW, García Ángel. Restrained glycoprotein VI-induced platelet signaling by tyrosine protein phosphatases independent of phospholipase Cγ2. Bleeding Thromb Vascul Biol [Internet]. 2023 Oct. 11 [cited 2025 Sep. 16];2(3). Available from: https://www.btvb.org/btvb/article/view/93
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