Toso regulates the balance between apoptotic and nonapoptotic death receptor signaling by facilitating RIP1 ubiquitination.
Blood
; 118(3): 598-608, 2011 Jul 21.
Article
em En
| MEDLINE
| ID: mdl-21613257
ABSTRACT
The regulation of cellular survival and apoptosis is of critical importance for the immune system to maintain immune homeostasis and to establish tolerance. Here, we demonstrate that the immune specific cell surface molecule Toso exhibits antiapoptotic effects on death receptor signaling by a novel regulatory mechanism involving the adaptor kinase RIP1. The antiapoptotic function of Toso depends on RIP1 ubiquitination and involves the recruitment of the death adaptor FADD to a Toso/RIP1 protein complex. In response to CD95L and TNFα, Toso promotes the activation of MAPK and NF-κB signaling pathways. Because of this relative augmentation of survival versus apoptotic signals, Toso raises the threshold for death receptor-mediated apoptosis. Our analysis of Toso-deficient mice revealed that Toso is essential for TNFα-mediated liver damage. Furthermore, the antiapoptotic function of Toso could be blocked by a Toso-specific monoclonal antibody, opening up new therapeutic prospects for the treatment of immune disorders and hematologic malignancies.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Transdução de Sinais
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Proteínas de Ligação a RNA
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Apoptose
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Complexo de Proteínas Formadoras de Poros Nucleares
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Proteínas Reguladoras de Apoptose
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Ubiquitinação
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Proteínas de Membrana
Limite:
Animals
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Humans
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article