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Thymocyte and T cell apoptosis: is all death created equal?
1Laboratory of Immune Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA.
Thymus
|January 1, 1994
Summary
Apoptosis, or programmed cell death, eliminates self-reactive thymocytes, crucial for self-tolerance. Recent findings highlight its role in both central and peripheral T cell tolerance, involving mechanisms like Bcl-2 and Fas.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Apoptosis (programmed cell death) is vital for eliminating self-reactive thymocytes during development, ensuring self-tolerance.
- Emerging evidence suggests apoptosis also actively maintains peripheral T cell tolerance.
- The precise mechanisms initiating apoptosis and regulatory factors influencing cell death susceptibility remain incompletely understood.
Purpose of the Study:
- To review recent findings on apoptosis in T cell development and tolerance.
- To emphasize the roles of the Bcl-2 family and Fas in apoptosis.
- To compare apoptotic signaling in central and peripheral T cells.
Main Methods:
- Literature review focusing on recent advancements in apoptosis research.
- Analysis of protective mechanisms, including the Bcl-2 family's 'rheostat' function.
- Examination of Fas-mediated activation-induced cell death.
- Comparative analysis of apoptotic signals in thymocytes and peripheral T cells.
Main Results:
- The Bcl-2 family acts as a protective rheostat, modulating apoptosis.
- Fas plays a significant role in activation-induced apoptosis.
- Physiological signals triggering apoptosis differ between thymocytes and peripheral T cells, suggesting distinct regulatory mechanisms.
Conclusions:
- Apoptosis is a critical process for both central and peripheral T cell tolerance.
- The Bcl-2 family and Fas are key regulators of T cell apoptosis.
- Distinct mechanisms may govern central and peripheral T cell deletion, warranting further investigation.