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Proceedings of the National Academy of Sciences
Article . 2007 . Peer-reviewed
Data sources: Crossref
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TORC2 regulates germinal center repression of the TCL1 oncoprotein to promote B cell development and inhibit transformation

Authors: Marco Herling; Samuel W. French; Randolph Wall; Michael A. Teitell; Ali I. Kuraishy; Dan Jones; Mara H. Sherman;

TORC2 regulates germinal center repression of the TCL1 oncoprotein to promote B cell development and inhibit transformation

Abstract

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.

Keywords

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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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    22
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
22
Top 10%
Top 10%
Top 10%
bronze