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Related Experiment Video

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Microfluidics in Assessing Platelet Function
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Hyperfibrinolysis is Associated with Complement Activation Following Trauma.

Christopher D Barrett1,2, Elizabeth R Maginot1, Ernest E Moore3,4

  • 1Division of Acute Care Surgery, Department of Surgery, University of Nebraska Medical Center, Omaha, Nebraska, United States.

Thrombosis and Haemostasis
|March 25, 2025
PubMed
Summary
This summary is machine-generated.

Trauma activates complement, but how is unclear. This study found fibrinolysis, the breakdown of blood clots, is linked to complement activation in trauma patients, suggesting plasmin may trigger this response.

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Area of Science:

  • Trauma and Injury Research
  • Immunology
  • Hematology

Background:

  • Complement activation following trauma is a known phenomenon, but its precise mechanisms remain elusive.
  • Fibrinolysis, the process of breaking down blood clots, exhibits diverse phenotypes post-injury, including hyperfibrinolysis and fibrinolysis shutdown.
  • Plasmin, a key enzyme in fibrinolysis, has the potential to directly activate complement components C3 and C5.

Purpose of the Study:

  • To investigate the potential relationship between complement activation and fibrinolysis in adult trauma patients.
  • To explore whether specific fibrinolytic phenotypes correlate with markers of complement activation.
  • To determine if fibrinolysis contributes to complement system activation in the context of trauma.

Main Methods:

  • Analysis of plasma samples from 56 adult trauma patients.
  • Utilized rapid and tPA-challenged thromboelastography (TEG) in the emergency department.
  • Measured complement activation markers (C3a, C4a, C5a, Ba, sC5b-9), complement regulatory proteins (Factor I, Factor H), and fibrinolytic markers (active PAI-1, A2AP, PAP, tPA activity) using multiplex, ELISA, and activity assays.

Main Results:

  • Complement components C3a and sC5b-9 were significantly elevated in patients with hyperfibrinolysis compared to those with physiologic or hypofibrinolysis.
  • Increased levels of C3a, C4a, and sC5b-9, alongside depleted Factors H and I, were associated with massive transfusion and post-injury mortality.
  • Significant positive correlations were observed between fibrinolysis markers and complement activation markers, while negative correlations existed with Factors H and I.

Conclusions:

  • Fibrinolysis appears to play a direct role in complement activation following trauma.
  • Plasmin-mediated cleavage of C3 and C5 by the fibrinolytic system may be a key mechanism driving complement activation in trauma patients.
  • These findings highlight a critical interplay between the coagulation and complement systems in the trauma response.