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Related Experiment Videos

Immunoglobulin E, a pathogenic factor in Plasmodium falciparum malaria

P Perlmann1, H Perlmann, B W Flyg

  • 1Department of Immunology, Stockholm University, Sweden. peter.perlmann@imm2.su.se

Infection and Immunity
|January 1, 1997
PubMed
Summary

Elevated immunoglobulin E (IgE) in malaria patients, especially severe cases, correlates with increased tumor necrosis factor alpha (TNF). This suggests IgE immune complexes contribute to excessive TNF production and malaria pathogenesis.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Pathogenesis

Background:

  • High endemicity of Plasmodium falciparum malaria is associated with elevated total immunoglobulin E (IgE) and specific antimalarial IgE antibodies.
  • IgE levels are highest in cerebral malaria, suggesting a pathogenic role for IgE.

Purpose of the Study:

  • To investigate the role of IgE elevation in severe malaria without cerebral involvement.
  • To determine if IgE contributes to tumor necrosis factor alpha (TNF) production in malaria.

Main Methods:

  • Incubation of peripheral blood mononuclear cells (PBMC) with IgE-containing serum from malaria-immune donors.
  • Analysis of TNF release upon stimulation with IgE-anti-IgE complexes or P. falciparum antigen.
  • Assessment of IgE receptor (CD23) expression on monocytic cells.

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Main Results:

  • IgE-containing immune complexes induced significant TNF release from PBMC.
  • TNF production was reduced when IgE was removed from serum.
  • Adherent monocytic cells showed increased CD23 expression upon exposure to IgE complexes.

Conclusions:

  • IgE elevation in malaria, particularly severe cases, is linked to increased TNF production.
  • IgE-mediated immune complexes activate monocytes, contributing to excessive TNF induction.
  • IgE represents an additional pathogenic mechanism in Plasmodium falciparum malaria.