Piezo1 gain of function induces a platelet preactivation state

Area of Science:

• Hematology
• Molecular Biology
• Genetics

Background:

• Hereditary xerocytosis (HX) is a red blood cell disorder caused by PIEZO1 gain-of-function (GOF) mutations.
• HX patients experience frequent thromboembolic events, particularly after splenectomy.

Purpose of the Study:

• To investigate the role of Piezo1 in platelet activation and thrombosis.
• To test the hypothesis that Piezo1 GOF mutations increase platelet activation and contribute to thrombotic events in HX.

Main Methods:

• Human platelets were activated with agonists and Yoda1 (a Piezo1 activator).
• Platelet aggregation, secretion, and calpain activation were measured.
• Mouse models with PIEZO1 GOF and knockout were used for ex vivo and in vivo thrombosis studies.

Main Results:

• Yoda1 potentiated agonist-induced platelet aggregation, secretion, and procoagulant activity.
• Platelets from PIEZO1 GOF mice showed increased aggregation and thrombus formation.
• PIEZO1 knockout mice exhibited reduced thrombus formation and altered bleeding times.

Conclusions:

• Activated Piezo1 correlates with enhanced platelet activation.
• Platelet Piezo1 GOF is implicated in the thrombotic events observed in hereditary xerocytosis patients.