Inhibition of factor XI activation attenuates inflammation and coagulopathy while improving the survival of mouse polymicrobial sepsis

Blood. 2012 May 17;119(20):4762-8. doi: 10.1182/blood-2011-10-386185. Epub 2012 Mar 22.


Severe bacterial sepsis often leads to a systemic procoagulant and proinflammatory condition that can manifest as disseminated intravascular coagulation, septic shock, and multiple organ failure. Because activation of the contact proteases factor XII (FXII), prekallikrein, and factor XI (FXI) can trigger coagulation and inflammatory responses, the contact factors have been considered potential targets for the treatment of sepsis. However, the pathogenic role of contact activation in severe infections has not been well defined. We therefore investigated whether an anticoagulant antibody (14E11) that selectively inhibits prothrombotic FXI activation by activated FXII (FXIIa) modifies the course of bowel perforation-induced peritoneal sepsis in mice. Early anticoagulation with 14E11 suppressed systemic thrombin- antithrombin complex formation, IL-6, and TNF-α levels, and reduced platelet consumption in the circulation and deposition in the blood vessels. Treatment with 14E11 within 12 hours after bowel perforation significantly improved survival compared with vehicle treatment, and the saturating dose did not increase tail bleeding. These data suggest that severe polymicrobial abdominal infection induces prothrombotic FXI activation, to the detriment of the host. Systemic anticoagulation by inhibiting FXI activation or FXIIa procoagulant activity during sepsis may therefore limit the development of disseminated intravascular coagulation without increasing bleeding risks.

Publication types

  • Comparative Study
  • Evaluation Study

MeSH terms

  • Animals
  • Antibodies, Monoclonal / pharmacology
  • Antibodies, Monoclonal / therapeutic use
  • Anticoagulants / pharmacology*
  • Anticoagulants / therapeutic use
  • Blood Coagulation Disorders / drug therapy
  • Blood Coagulation Disorders / etiology
  • Blood Coagulation Disorders / mortality
  • Blood Coagulation Disorders / prevention & control*
  • Coinfection / complications
  • Coinfection / drug therapy*
  • Coinfection / mortality*
  • Coinfection / pathology
  • Down-Regulation / drug effects
  • Factor XIa / antagonists & inhibitors
  • Factor XIa / immunology
  • Immunotherapy
  • Inflammation / etiology
  • Inflammation / pathology
  • Inflammation / prevention & control*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Protein C / pharmacology
  • Protein C / therapeutic use
  • Sepsis / complications
  • Sepsis / drug therapy*
  • Sepsis / mortality*
  • Sepsis / pathology
  • Survival Analysis


  • Antibodies, Monoclonal
  • Anticoagulants
  • Protein C
  • Factor XIa