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Related Experiment Videos

Complement C5 and early oxygen kinetics during murine sepsis.

Gabriel Valencia1, J Vidya Sarma, John G Younger

  • 1Department of Emergency Medicine, University of Michigan, Room 7679 Kresge Research Building I, 200 Zina Pitcher Place, Ann Arbor, MI 48019, USA.

Academic Emergency Medicine : Official Journal of the Society for Academic Emergency Medicine
|April 5, 2005
PubMed
Summary

Complement C5 plays a protective role in sepsis by aiding oxygen kinetics, contrary to initial assumptions of it worsening oxygen utilization. C5b generation appears crucial for host defense during sepsis.

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Area of Science:

  • Immunology
  • Physiology
  • Sepsis Pathophysiology

Background:

  • Sepsis commonly causes altered oxygen consumption (VO2) and carbon dioxide production (VCO2), but the underlying mechanisms are unclear.
  • The role of complement system activation, particularly C5, in sepsis-induced metabolic disturbances is not well understood.
  • This study investigates whether complement C5 exacerbates oxygen utilization abnormalities during abdominal sepsis.

Purpose of the Study:

  • To investigate the role of complement C5 in the development of abnormal oxygen kinetics during sepsis.
  • To determine if complement activation worsens oxygen use during abdominal sepsis.
  • To elucidate the specific role of C5a and C5b in sepsis-related oxygen metabolism.

Main Methods:

  • Utilized a murine model of sepsis induced by cecal ligation and puncture (CLP).

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  • Measured oxygen consumption (VO2) and carbon dioxide production (VCO2) using indirect calorimetry.
  • Compared wild-type and C5-deficient mice, and treated animals with anti-C5a antibodies.

    • Main Results:

    • Sepsis rapidly induced significant changes in oxygen kinetics within three hours.
    • C5-deficient mice exhibited more severe oxygen kinetic abnormalities and increased mortality compared to wild-type.
    • Targeting C5a with antibodies had minimal impact, suggesting C5b plays a protective role in early sepsis.

    Conclusions:

    • Complement C5 contributes beneficially to oxygen kinetics during sepsis.
    • The protective effect is mediated by C5b generation, enhancing host defense.
    • C5 does not worsen oxygen utilization through pro-inflammatory pathways in this sepsis model.