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11.
  • Wang, Yongzhi, et al. (författare)
  • Rac1 regulates sepsis-induced formation of platelet-derived microparticles and thrombin generation
  • 2017
  • Ingår i: Biochemical and Biophysical Research Communications. - : Elsevier BV. - 0006-291X. ; 487:4, s. 887-891
  • Tidskriftsartikel (refereegranskat)abstract
    • Dysfunctional coagulation aggravates clinical outcome in patients with sepsis. The aim of this study was to define the role of Rac-1 in the formation of platelet-derived microparticles (PMPs) and thrombin generation (TG) in abdominal sepsis. Male C57BL/6 mice underwent cecal ligation and puncture (CLP). Scanning electron microscopy and flow cytometry were used to quantify PMPs. TG was determined by use of a fluorimetric assay. It was found that CLP increased Rac1 activity in platelets, which was abolished by administration of the Rac1 inhibitor NSC23766. Sepsis-induced TG in vivo was reflected by reduced capacity of plasma from septic animals to generate thrombin ex vivo. Administration of NSC23766 increased peak and total TG in plasma from CLP mice indicating that Rac-1 regulates sepsis-induced formation of thrombin. The number of circulating PMPs was markedly elevated in animals with abdominal sepsis. Treatment with NSC23766 significantly decreased formation of PMPs in septic mice. Platelet activation in vitro caused release of numerous MPs. Notably, NSC23766 abolished PMP formation in activated platelets in vitro. These findings suggest that Rac-1 regulates PMP formation and TG in sepsis and that inhibition of Rac1 activity could be a useful target to inhibit dysfunctional coagulation in abdominal sepsis.
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