A Myc-regulated transcriptional network controls B-cell fate in response to BCR triggering.
BMC Genomics
; 10: 323, 2009 Jul 17.
Article
em En
| MEDLINE
| ID: mdl-19607732
ABSTRACT
BACKGROUND:
The B cell antigen receptor (BCR) is a signaling complex that mediates the differentiation of stage-specific cell fate decisions in B lymphocytes. While several studies have shown differences in signal transduction components as being key to contrasting phenotypic outcomes, little is known about the differential BCR-triggered gene transcription downstream of the signaling cascades.RESULTS:
Here we define the transcriptional changes that underlie BCR-induced apoptosis and proliferation of immature and mature B cells, respectively. Comparative genome-wide expression profiling identified 24 genes that discriminated between the early responses of the two cell types to BCR stimulation. Using mice with a conditional Myc-deletion, we validated the microarray data by demonstrating that Myc is critical to promoting BCR-triggered B-cell proliferation. We further investigated the Myc-dependent molecular mechanisms and found that Myc promotes a BCR-dependent clonal expansion of mature B cells by inducing proliferation and inhibiting differentiation.CONCLUSION:
This work provides the first comprehensive analysis of the early transcriptional events that lead to either deletion or clonal expansion of B cells upon antigen recognition, and demonstrates that Myc functions as the hub of a transcriptional network that control B-cell fate in the periphery.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Linfócitos B
/
Receptores de Antígenos de Linfócitos B
/
Transdução de Sinais
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Proteínas Proto-Oncogênicas c-myc
/
Redes Reguladoras de Genes
Limite:
Animals
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article