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Bad can act as a key regulator of T cell apoptosis and T cell development
C L Mok1, G Gil-Gómez, O Williams
1Division of Molecular Immunology, MRC National Institute for Medical Research, London NW7 1AA, United Kingdom.
Abstract:
Bad is a distant relative of Bcl-2 and acts to promote cell death. Here, we show that Bad expression levels are greatly increased in thymocytes during apoptosis. We generated bad transgenic mice to study the action of upregulated Bad expression on T cell apoptosis. The T cells from these mice are highly sensitive to apoptotic stimuli, including anti-CD95. The numbers of T cells are greatly depleted and the processes of T cell development and selection are perturbed. We show that the proapoptotic function of Bad in primary T cells is regulated by Akt kinase and that Bad overexpression enhances both cell cycle progression and interleukin 2 production after T cell activation. These data suggest that Bad can act as a key regulator of T cell apoptosis and that this is a consequence of its upregulation after exposure to death stimuli.
Insights
Increased Bad expression promotes T cell apoptosis. Transgenic mice show depleted T cells and perturbed development, highlighting Bad
Area of Science:
- Molecular Biology
- Immunology
- Cell Biology
Background:
- Bad is a Bcl-2 family member that promotes apoptosis.
- Bad expression increases in thymocytes during apoptosis.
- Its role in T cell apoptosis requires further investigation.
Purpose of the Study:
- To investigate the role of upregulated Bad expression in T cell apoptosis.
- To generate and analyze bad transgenic mice to study T cell apoptosis.
Main Methods:
- Generation of bad transgenic mice.
- Analysis of T cell apoptosis in response to stimuli (e.g., anti-CD95).
- Assessment of T cell development and selection.
- Investigation of Bad regulation by Akt kinase.
- Evaluation of cell cycle progression and IL-2 production.
Main Results:
- T cells from bad transgenic mice exhibit heightened sensitivity to apoptotic stimuli.
- Significant depletion of T cells and perturbed T cell development/selection observed.
- Bad's proapoptotic function in T cells is regulated by Akt kinase.
- Bad overexpression enhances cell cycle progression and IL-2 production post-activation.
Conclusions:
- Bad acts as a key regulator of T cell apoptosis.
- Upregulation of Bad following death stimuli contributes to T cell apoptosis.
- Bad influences T cell activation, proliferation, and survival.