Bim controls IL-15 availability and limits engagement of multiple BH3-only proteins.
Cell Death Differ
; 22(1): 174-84, 2015 Jan.
Article
em En
| MEDLINE
| ID: mdl-25124553
ABSTRACT
During the effector CD8+ T-cell response, transcriptional differentiation programs are engaged that promote effector T cells with varying memory potential. Although these differentiation programs have been used to explain which cells die as effectors and which cells survive and become memory cells, it is unclear if the lack of cell death enhances memory. Here, we investigated effector CD8+ T-cell fate in mice whose death program has been largely disabled because of the loss of Bim. Interestingly, the absence of Bim resulted in a significant enhancement of effector CD8+ T cells with more memory potential. Bim-driven control of memory T-cell development required T-cell-specific, but not dendritic cell-specific, expression of Bim. Both total and T-cell-specific loss of Bim promoted skewing toward memory precursors, by enhancing the survival of memory precursors, and limiting the availability of IL-15. Decreased IL-15 availability in Bim-deficient mice facilitated the elimination of cells with less memory potential via the additional pro-apoptotic molecules Noxa and Puma. Combined, these data show that Bim controls memory development by limiting the survival of pre-memory effector cells. Further, by preventing the consumption of IL-15, Bim limits the role of Noxa and Puma in causing the death of effector cells with less memory potential.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas Proto-Oncogênicas
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Linfócitos T CD8-Positivos
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Proteínas Proto-Oncogênicas c-bcl-2
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Interleucina-15
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Proteínas Supressoras de Tumor
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Proteínas Reguladoras de Apoptose
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Memória Imunológica
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Proteínas de Membrana
Limite:
Animals
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article