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Complement activation in severe Plasmodium falciparum malaria

C Wenisch1, S Spitzauer, K Florris-Linau

  • 1Internal Medicine I, University of Vienna, Vienna, Austria.

Clinical Immunology and Immunopathology
|November 5, 1997
PubMed
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Severe malaria activates complement pathways, indicated by increased Bb, SC5b-9, and C4d, and decreased C3 and iC3b. Tumor necrosis factor (TNF) levels correlate with complement activation, suggesting a role in complicated Plasmodium falciparum malaria.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Complement System Biology

Background:

  • Complicated Plasmodium falciparum malaria is a severe disease with significant morbidity and mortality.
  • The complement system plays a crucial role in innate and adaptive immunity and its dysregulation is implicated in various pathologies.
  • Understanding complement activation in malaria is vital for developing targeted therapies.

Purpose of the Study:

  • To investigate the activation status of the complement system in patients with complicated Plasmodium falciparum malaria.
  • To correlate complement activation markers with inflammatory cytokines, specifically tumor necrosis factor (TNF) and interleukin-6 (IL-6).
  • To explore the relationship between complement activation and clinical disease severity.

Main Methods:

Related Experiment Videos

  • Measurement of complement activation products (C3, C4, Bb, C4d, iC3b, SC5b-9) in plasma from patients with complicated malaria and healthy controls.
  • Quantification of plasma levels of TNF and IL-6.
  • Assessment of disease severity using the APACHE II score.
  • Statistical analysis to determine correlations between complement markers, cytokines, and clinical parameters.

Main Results:

  • Patients with complicated malaria exhibited significantly increased plasma levels of Bb, SC5b-9, and C4d, and decreased levels of C3 and iC3b compared to healthy controls.
  • Plasma C4 concentrations did not differ significantly between the groups.
  • Elevated TNF levels showed significant positive correlations with Bb and SC5b-9, and negative correlations with iC3b and TNF.
  • Significant correlations were observed between C3 and iC3b, and between C4 and C4d.
  • No significant correlation was found between clinical disease severity and complement fragment levels.

Conclusions:

  • Both classical and alternative pathways of the complement system are profoundly activated in complicated Plasmodium falciparum malaria.
  • Complement activation, particularly involving Bb and SC5b-9, is associated with elevated TNF levels.
  • The findings highlight the significant role of complement system dysregulation in the pathophysiology of severe malaria.