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Development and function of naturally occurring CD4+CD25+ regulatory T cells.
Akiko Toda1, Ciriaco A Piccirillo
1Department fo Microbiology and Immunology, McGill University, Montreal, Canada, H3A 2B4.
Journal of Leukocyte Biology
|July 1, 2006
Summary
Regulatory T (Treg) cells are crucial for controlling self-reactive immune responses and preventing autoimmunity. These CD4(+)CD25(+) cells, generated in the thymus, maintain immune tolerance through specific cellular and molecular mechanisms.
Area of Science:
- Immunology
- Cell Biology
Background:
- Peripheral T cell immunoregulation involves mechanisms like regulatory T (Treg) cells.
- Naturally occurring CD4(+)CD25(+) Treg cells (nTreg) are key in controlling self-reactive T cells and maintaining tolerance.
- Treg cells differentiate in the thymus as a distinct T cell subpopulation with a broad T cell receptor repertoire.
Purpose of the Study:
- To discuss the role of CD4(+)CD25(+) nTreg cells in inducing immunologic self-tolerance.
- To provide an overview of recent findings on the functional properties and effector mechanisms of nTreg cells.
Main Methods:
- Review of in vitro and in vivo models studying Treg cell function.
- Analysis of genetic control and cytokine influences (IL-2, TGF-β1) on Treg cell generation and activity.
Main Results:
- CD4(+)CD25(+) Treg cells are vital for controlling self-reactive T cell responses.
- Defects in Treg cell development or function lead to autoimmune and inflammatory diseases.
- Antigen recognition and cytokine signaling regulate Treg cell activation, expansion, and suppressive activity.
Conclusions:
- CD4(+)CD25(+) nTreg cells play a significant role in maintaining immunologic self-tolerance.
- Understanding the cellular and molecular basis of Treg cell-mediated regulation is advancing.
- Treg cells are essential for preventing autoimmune diseases and maintaining immune homeostasis.