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Blood ; 120(6): 1254-61, 2012 Aug 09.
Artigo em Inglês | MEDLINE | ID: mdl-22709692

RESUMO

Birt-Hogg-Dubé (BHD) syndrome is an autosomal dominant disorder characterized by cutaneous fibrofolliculomas, pulmonary cysts, and kidney malignancies. Affected individuals carry germ line mutations in folliculin (FLCN), a tumor suppressor gene that becomes biallelically inactivated in kidney tumors by second-hit mutations. Similar to other factors implicated in kidney cancer, FLCN has been shown to modulate activation of mammalian target of rapamycin (mTOR). However, its precise in vivo function is largely unknown because germ line deletion of Flcn results in early embryonic lethality in animal models. Here, we describe mice deficient in the newly characterized folliculin-interacting protein 1 (Fnip1). In contrast to Flcn, Fnip1(-/-) mice develop normally, are not susceptible to kidney neoplasia, but display a striking pro-B cell block that is entirely independent of mTOR activity. We show that this developmental arrest results from rapid caspase-induced pre-B cell death, and that a Bcl2 transgene reconstitutes mature B-cell populations, respectively. We also demonstrate that conditional deletion of Flcn recapitulates the pro-B cell arrest of Fnip1(-/-) mice. Our studies thus demonstrate that the FLCN-FNIP complex deregulated in BHD syndrome is absolutely required for B-cell differentiation, and that it functions through both mTOR-dependent and independent pathways.


Assuntos
Linfócitos B/fisiologia , Síndrome de Birt-Hogg-Dubé/genética , Proteínas de Transporte/genética , Diferenciação Celular/genética , Deleção de Genes , Proteínas Proto-Oncogênicas/genética , Proteínas Supressoras de Tumor/genética , Animais , Linfócitos B/imunologia , Linfócitos B/metabolismo , Proteínas de Transporte/metabolismo , Proteínas de Transporte/fisiologia , Diferenciação Celular/imunologia , Células Cultivadas , Humanos , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Proteínas Proto-Oncogênicas/metabolismo , Proteínas Proto-Oncogênicas/fisiologia , Transdução de Sinais/genética , Transdução de Sinais/fisiologia , Especificidade da Espécie , Proteínas Supressoras de Tumor/metabolismo , Proteínas Supressoras de Tumor/fisiologia
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