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T-cell anergy.

Fernando Macián¹, Sin-Hyeog Im, Francisco J García-Cózar

¹Department of Pathology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Current Opinion in Immunology

|March 17, 2004

Summary

Self-reactive T cells are inactivated in the periphery through anergy, a state of functional unresponsiveness. Recent research clarifies the signals, cells, and molecular mechanisms driving T-cell anergy and peripheral tolerance.

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Area of Science:

Immunology
Cellular Biology
Molecular Biology

Background:

Self-reactive T cells escaping thymic negative selection pose a risk to the host.
Peripheral tolerance mechanisms are crucial for preventing autoimmunity.
T-cell anergy is a key pathway for establishing peripheral tolerance.

Purpose of the Study:

To elucidate the mechanisms underlying the induction and maintenance of T-cell anergy.
To identify the signals and cellular players involved in inducing peripheral tolerance.
To understand the molecular basis of the unresponsive state in anergic T cells.

Main Methods:

Review of recent studies on T-cell anergy.
Analysis of signaling pathways involved in T-cell inactivation.
Investigation of cellular interactions in peripheral tolerance.

Main Results:

Anergy renders T cells functionally unresponsive, preventing productive responses even with co-stimulation.
Insights into the specific signals that induce tolerance have been gained.
The cells capable of delivering tolerogenic signals have been identified.
Molecular processes underlying the anergic state are becoming clearer.

Conclusions:

Peripheral tolerance is actively imposed on self-reactive T cells.
T-cell anergy is a critical and well-defined mechanism of peripheral tolerance.
Understanding these mechanisms advances knowledge of immune regulation and autoimmunity.

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