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Related Experiment Videos

Functional CD4 T cell subset interplay in an intact immune system

J S Murray1, J Madri, T Pasqualini

  • 1Department of Pathology, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510.

Journal of Immunology (Baltimore, Md. : 1950)
|May 15, 1993
PubMed
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Immunization with human collagen IV selectively activates T helper cells based on mouse genotype. In F1 hybrid mice, T helper 1 (Th-1) responses dominated, but could be shifted to T helper 2 (Th-2) by blocking specific immune responses.

Area of Science:

  • Immunology
  • T cell activation
  • Autoimmune disease research

Background:

  • Immunization with human collagen IV induces distinct T helper 1 (Th-1) or T helper 2 (Th-2) cell responses.
  • The specific T helper cell response is determined by the mouse's I-A genotype (I-As for Th-1, I-Ab for Th-2).

Purpose of the Study:

  • To investigate the CD4 T cell response in (bxs)F1 hybrid mice after immunization with human collagen IV.
  • To determine the role of I-A restriction in directing T helper cell polarization.

Main Methods:

  • Immunization of (bxs)F1 hybrid mice with human collagen IV.
  • Analysis of CD4 T cell proliferation, antibody production, and cytokine secretion (IFN-gamma, IL-5).
  • In vivo inhibition of Th-1 responses using anti-I-As antibody and anti-IFN-gamma treatment.

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Main Results:

  • Human collagen IV immunization in F1 hybrid mice predominantly induced Th-1-like responses, characterized by proliferation and IFN-gamma secretion.
  • The dominant Th-1 response was I-As restricted.
  • Inhibition of Th-1 priming (using anti-I-As or anti-IFN-gamma) revealed an underlying Th-2-like response, with IL-5 secretion and antibody formation.

Conclusions:

  • F1 hybrid mice exhibit a dominant, I-As-restricted Th-1 response to human collagen IV.
  • Interferon-gamma (IFN-gamma)-producing or controlling CD4 T cells restricted by I-As can suppress Th-2 priming.
  • These findings offer insights into the mechanisms of T cell polarization and potential regulation in autoimmune conditions.