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Related Experiment Videos

Anti-complement strategies in experimental sepsis.

Peter A Ward1, Niels C Riedemann, Ren-Feng Guo

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109-0602, USA. pward@umich.edu

Scandinavian Journal of Infectious Diseases
|November 19, 2003
PubMed
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Sepsis triggers excessive complement system activation, impairing neutrophil function. Blocking C5a or its receptor (C5aR) improves survival in rodent sepsis models, suggesting a therapeutic target.

Area of Science:

  • Immunology
  • Pathophysiology
  • Molecular Medicine

Background:

  • Sepsis involves excessive complement system activation.
  • This activation leads to impaired neutrophil functions, crucial for innate immunity.
  • Defects include compromised chemotaxis, respiratory burst, and phagocytosis.

Purpose of the Study:

  • To investigate the molecular mechanisms behind sepsis-induced immune defects.
  • To explore the role of complement activation product C5a and its receptor C5aR.
  • To assess the therapeutic potential of targeting C5a/C5aR in sepsis.

Main Methods:

  • Utilized the cecal ligation/puncture (CLP) rodent model of sepsis.
  • Assessed neutrophil functions (chemotaxis, respiratory burst, phagocytosis).

Related Experiment Videos

  • Measured C5a receptor (C5aR) and interleukin-6 (IL-6) levels.
  • Investigated C5a-induced thymocyte apoptosis via caspase activation and DNA laddering.
  • Evaluated survival rates following treatment with anti-C5a, anti-IL-6, or anti-C5aR antibodies.

    • Main Results:

    • CLP induced excessive complement activation and neutrophil dysfunction.
    • C5a and up-regulated C5aR were linked to these defects.
    • C5aR upregulation in the thymus correlated with C5a-dependent thymocyte apoptosis.
    • Blocking C5a, IL-6, or C5aR significantly improved survival in CLP rodents.

    Conclusions:

    • Excessive complement activation via C5a and C5aR contributes to sepsis-induced immune suppression and mortality.
    • Targeting the C5a/C5aR pathway offers a promising therapeutic strategy for sepsis.
    • Further investigation in human sepsis patients is warranted.