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Related Experiment Videos

Helper T-cell subsets in mouse leishmaniasis: induction, expansion and effector function.

R M Locksley1, P Scott

  • 1Dept of Medicine and Microbiology, University of California, San Francisco 94143-0654.

Immunology Today
|March 1, 1991
PubMed
Summary

Two distinct CD4+ T cell subsets, identified in vitro, also appear during Leishmania infections in mice. These T helper 1 (TH1) or T helper 2 (TH2) cell expansions correlate with disease outcomes, influencing parasite clearance or dissemination.

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Area of Science:

  • Immunology
  • Parasitology
  • Cellular Biology

Background:

  • Leishmania infection presents a spectrum of clinical outcomes, from resolution to fatal dissemination.
  • CD4+ T cells play a critical role in modulating immune responses to pathogens.
  • Distinct subsets of CD4+ T cells, specifically T helper 1 (TH1) and T helper 2 (TH2) cells, are known to orchestrate different immune responses.

Purpose of the Study:

  • To investigate the occurrence and role of distinct CD4+ T cell subsets during Leishmania infection in mice.
  • To explore the mechanisms underlying the divergent immune responses leading to varied disease outcomes.

Main Methods:

  • In vitro cloning of mouse CD4+ T cells to identify distinct subsets.
  • Analysis of CD4+ T cell populations in mice infected with Leishmania.

Related Experiment Videos

  • Correlation of T helper cell subset expansion with clinical manifestations of Leishmania infection.

    • Main Results:

    • Two distinct subsets of mouse CD4+ T cells, previously identified in vitro, were also observed during Leishmania infection.
    • Expansion of TH1 CD4+ cells was associated with successful resolution of infection.
    • Expansion of TH2 CD4+ cells correlated with fatal dissemination of the parasite.

    Conclusions:

    • The differentiation of CD4+ T cells into distinct TH1 and TH2 subsets is a key factor determining the outcome of Leishmania infection in mice.
    • Understanding the mechanisms driving these disparate T cell responses is crucial for developing effective therapeutic strategies against Leishmania.