Aiolos transcription factor controls cell death in T cells by regulating Bcl-2 expression and its cellular localization.
We searched for proteins that interact with Ras in interleukin (IL)-2-stimulated or IL-2-deprived cells, and found that the transcription factor Aiolos interacts with Ras. The Ras-Aiolos interaction was confirmed in vitro and in vivo by co-immunoprecipitation. Indirect immunofluorescence shows that IL-2 controls the cellular distribution of Aiolos and induces its tyrosine phosphorylation, required for dissociation from Ras. We also identified functional Aiolos- binding sites in the Bcl-2 promoter, which are able to activate the luciferase reporter gene. Mutation of Aiolos- binding sites within the Bcl-2 promoter inhibits transactivation of the reporter gene luciferase, suggesting direct control of Bcl-2 expression by Aiolos. Co-transfection experiments confirm that Aiolos induces Bcl-2 expression and prevents apoptosis in IL-2-deprived cells. We propose a model for the regulation of Bcl-2 expression via Aiolos.[1]References
- Aiolos transcription factor controls cell death in T cells by regulating Bcl-2 expression and its cellular localization. Romero, F., Martínez-A, C., Camonis, J., Rebollo, A. EMBO J. (1999) [Pubmed]
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