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Related Concept Videos

T Cell Types and Functions01:24

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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B Cell Activation and Differentiation01:24

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Related Experiment Video

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Isolation and Th17 Differentiation of Na&#239;ve CD4 T Lymphocytes
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IL-25 exhibits disparate roles during Th2-cell differentiation versus effector function.

Helen Mearns1, Elizabeth E Forbes-Blom, Mali Camberis

  • 1Malaghan Institute of Medical Research, Wellington, New Zealand.

European Journal of Immunology
|April 17, 2014
PubMed
Summary

Interleukin-25 (IL-25) does not play a role in T helper 2 (Th2) cell differentiation, challenging its proposed function in allergic diseases and asthma therapies.

Keywords:
CD4+ T cellsIL-25IL-4Nippostrongylus brasiliensisTh2

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Area of Science:

  • Immunology
  • Allergy Research
  • Cellular Biology

Background:

  • T helper 2 (Th2) cells are key targets for allergic disease therapies, particularly asthma.
  • The cytokine Interleukin-25 (IL-25) has been recently implicated in enhancing Th2 immune activity and allergic inflammation.

Purpose of the Study:

  • To investigate the physiological role of IL-25 in Th2 cell differentiation.
  • To determine if IL-25 is critical for the development of Th2 effector and memory cells.

Main Methods:

  • Crossed IL-25(-/-) C57BL/6 mice with G4 IL-4 C57BL/6 reporter mice.
  • Developed in vitro and in vivo assays for IL-4-independent Th2 cell differentiation.

Main Results:

  • IL-25 was found to have no physiological role in Th2 cell differentiation.
  • IL-25 did not influence the development of effector or memory Th2 cell subsets.

Conclusions:

  • The findings challenge the proposed role of IL-25 in promoting Th2 cell responses.
  • This study questions the therapeutic potential of targeting IL-25 for allergic diseases like asthma.