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Related Experiment Videos

Thrombin generation and mortality during Staphylococcus aureus sepsis.

M I Bokarewa1, A Tarkowski

  • 1Department of Rheumatology, Sahlgrenska University Hospital, Göteborg, Sweden. maria.bokarewa@immuno.gu.se

Microbial Pathogenesis
|April 21, 2001
PubMed
Summary

Sepsis causes blood clotting issues, with protein C levels dropping early. While protein C or activated protein C didn't improve survival in mice, reducing thrombin generation with protein C did enhance survival.

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Area of Science:

  • Microbiology
  • Hematology
  • Immunology

Background:

  • Sepsis-induced coagulopathy is a significant factor in mortality during severe bacterial infections.
  • Understanding coagulation system alterations is crucial for managing sepsis.
  • Staphylococcus aureus sepsis presents a specific model for studying these effects.

Purpose of the Study:

  • To investigate coagulation parameter changes in a murine model of Staphylococcus aureus sepsis.
  • To evaluate the therapeutic potential of protein C supplementation in this sepsis model.
  • To correlate coagulation abnormalities with inflammatory markers like IL-6.

Main Methods:

  • Induction of Gram-positive sepsis using Staphylococcus aureus in a murine model.
  • Monitoring of key coagulation parameters, including tissue factor activity and protein C levels.

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  • Assessment of serum Interleukin-6 (IL-6) as an indicator of inflammation.
  • Administration of protein C or activated protein C (APC) for supplementation studies.

    • Main Results:

    • Sepsis induced a hypercoagulable state with early activation of the extrinsic coagulation pathway.
    • Tissue factor activity increased, and protein C levels decreased early in sepsis.
    • The intrinsic coagulation pathway remained unaffected.
    • No correlation was observed between coagulation parameter changes and IL-6 levels.
    • Neither protein C nor APC supplementation improved survival rates in S. aureus sepsis.
    • A reduction in thrombin generation following protein C supplementation was linked to significantly improved survival.

    Conclusions:

    • Staphylococcus aureus sepsis in mice leads to extrinsic pathway activation and hypocoagulability, without impacting the intrinsic pathway.
    • Coagulation changes were independent of the inflammatory response intensity (IL-6 levels).
    • Protein C supplementation did not enhance survival, but reducing thrombin generation via protein C intervention showed a survival benefit, suggesting a complex role in sepsis management.