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IL-10 producing CD8+ T cells in human infection with Leishmania guyanensis

Eliane Bourreau1, Catherine Ronet, Pierre Couppié

  • 1Immunologie des Leishmanioses, Institut Pasteur de la Guyane, 97306 Cayenne, French Guiana.

Microbes and Infection
|June 5, 2007
PubMed

Insights

This study reveals distinct cytokine profiles in Leishmania patients and healthy individuals. Transforming growth factor-beta (TGF-beta) neutralization in healthy subjects induced interleukin-10 (IL-10), impacting immune responses to Leishmania.

Area of Science:

  • Immunology
  • Cellular Biology
  • Pathogen Response

Background:

  • Cytokines are crucial in immune responses against intracellular pathogens.
  • Leishmania infections elicit complex cellular immune reactions.

Purpose of the Study:

  • To analyze cytokine production (TGF-beta, IL-10, IFN-gamma) in Leishmania-infected patients and healthy controls.
  • To investigate the role of TGF-beta and IL-10 in modulating immune responses during Leishmania infection.

Main Methods:

  • Peripheral blood mononuclear cells (PBMCs) from healthy subjects and LCL patients were stimulated with live Leishmania guyanensis.
  • Cytokine production was measured, and TGF-beta was neutralized in vitro.
  • Phenotypic analysis of cytokine-producing cells was performed using flow cytometry.

Main Results:

  • IFN-gamma was produced by both controls and LCL patients.
  • IL-10 was exclusively produced by LCL patients, while TGF-beta was produced by controls.
  • TGF-beta neutralization in controls induced IL-10 production, primarily from CD8+ T cells.
  • IL-10 inhibited reactive nitrogen species production without affecting IFN-gamma levels.
  • In LCL patients, IL-10 was produced by both CD4+ and CD8+ T cells.

Conclusions:

  • Distinct cytokine profiles differentiate Leishmania patients from healthy individuals.
  • TGF-beta plays a regulatory role in IL-10 production by T cells.
  • IL-10-producing CD8+ T cells may have a significant role in Leishmania pathogenesis and warrant further investigation.

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