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[Defense mechanisms in trypanosomiasis]

P S Daulouede1, M C Okomo-Assoumou, M Labassa

  • 1Laboratoire de parasitologie, Université de Bordeaux II.

Bulletin De La Societe De Pathologie Exotique (1990)
|January 1, 1994
PubMed
Summary

Macrophages produce Nitric Oxide (NO) and Tumor Necrosis Factor-alpha (TNF-alpha), crucial for combating trypanosomiasis. These molecules show potent anti-microbial effects against the parasite, aiding host resistance.

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Identification of a tryptophan-like epitope borne by the variable surface glycoprotein (VSG) of African trypanosomes.

Experimental parasitology·2006

Area of Science:

  • Immunology
  • Parasitology
  • Molecular Biology

Context:

  • Macrophages play a key role in the host immune response to parasitic infections like trypanosomiasis.
  • Altered macrophage function is a hallmark of this disease.

Purpose:

  • To investigate the role of macrophage-derived molecules, specifically Nitric Oxide (NO) and Tumor Necrosis Factor-alpha (TNF-alpha), in combating trypanosomiasis.
  • To explore the mechanisms of NO and TNF-alpha production and their anti-parasitic activities.

Summary:

  • Macrophages from mice infected with Trypanosoma musculi produce NO, with trypanostatic activity correlating to NO levels.
  • In vitro studies show that Interferon-gamma (IFN-gamma) activates macrophage NO synthase, and TNF-alpha is involved in this induction.
  • Elevated serum TNF-alpha levels correlate with disease severity in human African trypanosomiasis, and TNF-alpha exhibits a strong anti-trypanosomal effect.

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Impact:

  • This research highlights the critical role of macrophage effector molecules, NO and TNF-alpha, in host defense against trypanosomes.
  • Understanding these mechanisms can inform the development of novel therapeutic strategies for trypanosomiasis.