TORC2 regulates germinal center repression of the TCL1 oncoprotein to promote B cell development and inhibit transformation
TORC2 regulates germinal center repression of the TCL1 oncoprotein to promote B cell development and inhibit transformation
Aberrant expression of the TCL1 oncoprotein promotes malignant transformation of germinal center (GC) B cells. Repression ofTCL1in GC B cells facilitates FAS-mediated apoptosis and prevents lymphoma formation. However, the mechanism for this repression is unknown. Here we show that the CREB coactivator TORC2 directly regulatesTCL1expression independent of CREB Ser-133 phosphorylation and CBP/p300 recruitment. GC signaling through CD40 or the BCR, which activates pCREB-dependent genes, caused TORC2 phosphorylation, cytosolic emigration, andTCL1repression. Signaling via cAMP-inducible pathways inhibitedTCL1repression and reduced apoptosis, consistent with a prosurvival role for TCL1 before GC selection and supporting an initiating role for aberrantTCL1expression during GC lymphomagenesis. Our data indicate that a novel CREB/TORC2 regulatory mode controls the normal program of GC gene activation and repression that promotes B cell development and circumvents oncogenic progression. Our results also reconcile a paradox in which signals that activate pCREB/CBP/p300 genes concurrently repressTCL1to initiate its silencing.
- University of California, Los Angeles United States
- UCLA Jonsson Comprehensive Cancer Center United States
- The University of Texas System United States
- The University of Texas MD Anderson Cancer Center United States
- UCLA Health United States
Transcriptional Activation, B-Lymphocytes, Genetic Vectors, Apoptosis, Germinal Center, Models, Biological, Cell Line, Gene Expression Regulation, Neoplastic, Jurkat Cells, Cell Transformation, Neoplastic, Retroviridae, Cell Line, Tumor, Proto-Oncogene Proteins, Humans, Plasmids, Signal Transduction, Transcription Factors
Transcriptional Activation, B-Lymphocytes, Genetic Vectors, Apoptosis, Germinal Center, Models, Biological, Cell Line, Gene Expression Regulation, Neoplastic, Jurkat Cells, Cell Transformation, Neoplastic, Retroviridae, Cell Line, Tumor, Proto-Oncogene Proteins, Humans, Plasmids, Signal Transduction, Transcription Factors
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