Tissue Factor-Negative Cell-Derived Microparticles Play a Distinctive Role in Hemostasis: A Viewpoint Review

Area of Science:

• Hematology
• Hemostasis
• Pathophysiology

Background:

• Circulating cell-derived microparticles (MPs) possess procoagulant activity.
• Their significant role in hemostasis has been historically underestimated.
• This review highlights clinical evidence supporting MPs' distinct hemostatic function.

Purpose of the Study:

• To review direct clinical evidence demonstrating the importance of MPs in hemostasis.
• To propose a distinct MP-mediated hemostatic pathway.
• To explore potential therapeutic applications for controlling bleeding.

Main Methods:

• Review of clinical studies and case reports.
• Analysis of data from congenital bleeding disorders.
• Examination of findings in trauma, coronary surgery, and immune thrombocytopenia patients.

Main Results:

• Impaired MP release linked to congenital bleeding disorders.
• Elevated endogenous MPs correlate with reduced transfusion needs and better outcomes in trauma patients.
• Pre-operative MP levels predict transfusion requirements in cardiac surgery.
• High MP levels in immune thrombocytopenia patients indicate reduced bleeding risk.

Conclusions:

• MPs play a significant, distinct role in hemostasis, potentially through contact factor pathway potentiation.
• MP-mediated coagulation defects resemble Factor XI deficiency (hemophilia C), termed type C hemostasis.
• Understanding this pathway may improve bleeding control in clinical settings.