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Rac1 regulates sepsis-induced formation of platelet-derived microparticles and thrombin generation

Yongzhi Wang1, Lingtao Luo2, Matthias Mörgelin3

  • 1Department of Clinical Sciences, Malmö, Section for Surgery, Lund University, Sweden.

Biochemical and Biophysical Research Communications
|May 4, 2017
PubMed

Insights

Rac-1 inhibition reduces platelet-derived microparticles and thrombin generation in abdominal sepsis. Targeting Rac1 activity offers a potential therapeutic strategy for sepsis-induced coagulopathy.

Area of Science:

  • Coagulation and Thrombosis
  • Sepsis Pathophysiology
  • Molecular Biology

Background:

  • Dysfunctional coagulation is a significant factor in sepsis outcomes.
  • Platelet-derived microparticles (PMPs) and thrombin generation (TG) play critical roles in sepsis-associated coagulopathy.

Purpose of the Study:

  • To investigate the role of Rac-1 in PMP formation and TG during abdominal sepsis.
  • To evaluate the therapeutic potential of Rac1 inhibition in a mouse model of abdominal sepsis.

Main Methods:

  • Cecal ligation and puncture (CLP) model in male C57BL/6 mice.
  • Quantification of PMPs using scanning electron microscopy and flow cytometry.
  • Assessment of TG via fluorimetric assay and ex vivo plasma analysis.

Main Results:

  • CLP increased Rac1 activity in platelets; inhibition with NSC23766 abolished this effect.
  • Sepsis reduced ex vivo TG capacity, which was restored by NSC23766 administration.
  • Elevated circulating PMPs in septic mice were significantly reduced by NSC23766 treatment.
  • NSC23766 inhibited PMP formation in activated platelets in vitro.

Conclusions:

  • Rac-1 plays a key role in regulating PMP formation and TG in abdominal sepsis.
  • Inhibition of Rac1 activity presents a promising therapeutic target for managing sepsis-induced coagulopathy.
Keywords:
CoagulationInflammationMicroparticlesPlatelets

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