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T cell development in CD3-zeta mutant mice

M T Huang1

  • 1GenPharm International, Mountain View, CA 94043, USA.

International Reviews of Immunology
|January 1, 1995
PubMed
Summary

The CD3-zeta subunit is crucial for T lymphocyte development, influencing both thymus-dependent and extrathymic pathways. Gene-targeting experiments reveal unique intestinal T cells in CD3-zeta mutant mice, independent of thymic selection.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Developmental Biology

Background:

  • T lymphocyte development occurs via multiple pathways, including the well-characterized thymus-dependent route.
  • Extrathymic T cell development, particularly in the intestine, is poorly understood.
  • Intestinal intraepithelial lymphocytes (IELs) are known to develop outside the thymus.

Purpose of the Study:

  • To review the role of the CD3-zeta subunit in T cell development.
  • To investigate extrathymic T cell development using gene-targeting experiments in mice.
  • To define crucial stages in thymocyte differentiation.

Main Methods:

  • Gene-targeting experiments in mice.
  • Analysis of T cell populations in various lymphoid compartments.
  • Characterization of T cell receptor (TCR)/CD3 complex expression.

Main Results:

  • CD3-zeta subunit plays a critical role in both thymic and extrathymic T cell development.
  • CD3-zeta mutant mice exhibit a unique population of intestinal IELs.
  • These IELs develop independently of thymic selection and express a novel TCR/CD3 complex.

Conclusions:

  • The CD3-zeta subunit is essential for T cell development and differentiation.
  • Extrathymic T cell development pathways can be independent of thymic processes.
  • Novel TCR/CD3 complexes are involved in extrathymic T cell development.

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