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Interactions between Trypanosoma brucei and CD8+ T cells.

T Olsson1, M Bakhiet, K Kristensson

  • 1Department of Neurology, Karolinska Institute, Huddinge University Hospital, S-141 86 Huddinge, Stockholm, Sweden.

Parasitology Today (Personal Ed.)
|July 1, 1992
PubMed
Summary

African trypanosomiasis mechanisms remain unclear. Trypanosoma brucei triggers CD8(+) T cells to release interferon-gamma (IFN-gamma), promoting parasite growth and affecting host immunity and the nervous system.

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Area of Science:

  • Immunology
  • Neuroscience
  • Parasitology

Background:

  • African trypanosomiasis, also known as sleeping sickness, presents unexplained features like parasite growth promotion, immune dysregulation, and neuropsychiatric symptoms.
  • The complex interplay between the host immune system and the parasite Trypanosoma brucei is not fully understood.

Purpose of the Study:

  • To investigate the interaction between Trypanosoma brucei and CD8(+) T cells.
  • To identify parasite-derived molecules that influence host immune responses and disease pathogenesis.

Main Methods:

  • Focus on the interaction between Trypanosoma brucei and CD8(+) T cells.
  • Analysis of a diffusible molecule released by T. brucei.
  • Assessment of interferon-gamma (IFN-gamma) production by CD8(+) T cells.

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Main Results:

  • A diffusible molecule from T. brucei was identified that activates CD8(+) T cells.
  • Activated CD8(+) T cells produce interferon-gamma (IFN-gamma).
  • IFN-gamma acts as a growth stimulus for the parasite and modulates host immune and nervous systems.

Conclusions:

  • The interaction between T. brucei and CD8(+) T cells, leading to IFN-gamma production, is a key mechanism in African trypanosomiasis.
  • This mechanism contributes to parasite survival and influences the development of disease symptoms, including neuropsychiatric manifestations.