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Impact of PI3Kα(Phosphoinositide3-Kinase Alpha)Inhibition onHemostasis andThrombosis Pierre LaurentBéatrice HechlerRomain Solinhac2018 год

Impact of PI3Kα (Phosphoinositide 3-Kinase Alpha) Inhibition on Hemostasis and Thrombosis
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Аннотация: Objective— PI3Kα (phosphoinositide 3-kinase alpha) is a therapeutic target in oncology, but its role in platelets and thrombosis remains ill characterized. In this study, we have analyzed the role of PI3Kα in vitro, ex vivo, and in vivo in 2 models of arterial thrombosis. Approach and Results— Using mice selectively deficient in p110α in the megakaryocyte lineage and isoform-selective inhibitors, we confirm that PI3Kα is not mandatory but participates to thrombus growth over a collagen matrix at arterial shear rate. Our data uncover a role for PI3Kα in low-level activation of the GP (glycoprotein) VI-collagen receptor by contributing to ADP secretion and in turn full activation of PI3Kβ and Akt/PKB (protein kinase B). This effect was no longer observed at high level of GP VI agonist concentration. Our study also reveals that over a vWF (von Willebrand factor) matrix, PI3Kα regulates platelet stationary adhesion contacts under arterial flow through its involvement in the outside-in signaling of vWF-engaged α IIb β 3 integrin. In vivo, absence or inhibition of PI3Kα resulted in a modest but significant decrease in thrombus size after superficial injuries of mouse mesenteric arteries and an increased time to arterial occlusion after carotid lesion, without modification in the tail bleeding time. Considering the more discrete and nonredundant role of PI3Kα compared with PI3Kβ, selective PI3Kα inhibitors are unlikely to increase the bleeding risk at least in the absence of combination with antiplatelet drugs or thrombopenia. Conclusions— This study provides mechanistic insight into the role of PI3Kα in platelet activation and arterial thrombosis.
Год издания: 2018
Авторы: Pierre Laurent, Béatrice Hechler, Romain Solinhac, Ashraf Ragab, Cendrine Cabou, Typhaine Anquetil, Sonia Séverin, Cécile V. Denis, P Mangin, Bart Vanhaesebroeck, Bernard Payrastre, Marie‐Pierre Gratacap
Издательство: Lippincott Williams & Wilkins
Источник: Arteriosclerosis Thrombosis and Vascular Biology
Ключевые слова: Platelet Disorders and Treatments, Antiplatelet Therapy and Cardiovascular Diseases, Autoimmune Bullous Skin Diseases
Другие ссылки: Arteriosclerosis Thrombosis and Vascular Biology (PDF)
Arteriosclerosis Thrombosis and Vascular Biology (HTML)
hal.science (HTML)
PubMed (HTML)