The prothrombotic state in paroxysmal nocturnal hemoglobinuria: a multifaceted source

Area of Science:

• Hematology
• Thrombosis Research
• Complement System

Background:

• Paroxysmal nocturnal hemoglobinuria (PNH) is a rare acquired hematologic disorder.
• Thrombosis is the most serious complication of PNH, with mechanisms not fully understood.
• Unlike other thrombotic disorders, PNH thrombosis is predominantly complement-mediated.

Purpose of the Study:

• To review and discuss factors contributing to the increased thrombosis risk in PNH.
• To elucidate the complex prothrombotic state in PNH.
• To highlight the role of complement-mediated mechanisms in PNH-related thrombosis.

Main Methods:

• Literature review of existing studies on PNH and thrombosis.
• Analysis of pathological effects contributing to a prothrombotic state.
• Discussion of impaired fibrinolysis and its potential causes.

Main Results:

• PNH induces a multifaceted prothrombotic state via platelet activation, intravascular hemolysis, and neutrophil/monocyte activation.
• Platelet/endothelial microparticles and oxidative stress may contribute to thrombosis risk.
• Impaired fibrinolysis is observed, potentially linked to complement activation, coagulation, and fibrinolysis interactions.

Conclusions:

• Multiple factors contribute to thrombosis in PNH, but their relative importance is unclear.
• Further research using novel in vivo and in vitro models is needed.
• Clarifying complement-driven prothrombotic mechanisms and impaired fibrinolysis in PNH is crucial.