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首页> 外文期刊>Nature immunology >The STAT3 isoforms alpha and beta have unique and specific functions.
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The STAT3 isoforms alpha and beta have unique and specific functions.

机译:STAT3亚型的alpha和beta具有独特的特定功能。

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Signal transducer and activator of transcription 3 (STAT3) is the main mediator of interleukin 6 (IL-6)-type cytokine signaling. It exists in two isoforms: the full-length STAT3 alpha and the truncated STAT3 beta, generally thought to act as a dominant negative factor. To assess their relative functions, we ablated the expression of either isoform by gene targeting. We show here that in vivo STAT3 beta is not a dominant negative factor. Its expression can rescue the embryonic lethality of a STAT3-null mutation and it can by itself induce the expression of specific STAT3 target genes. Nevertheless, STAT3 alpha has nonredundant roles such as modulation of cellular responses to IL-6 and mediation of IL-10 function in macrophages.
机译:信号转导和转录激活因子3(STAT3)是白介素6(IL-6)型细胞因子信号传导的主要介体。它以两种亚型存在:全长STAT3 alpha和截短的STAT3 beta,通常被认为是一个主要的负因子。为了评估它们的相对功能,我们通过基因靶向消除了任一同种型的表达。我们在这里显示体内STAT3 beta不是主要的负因子。它的表达可以挽救STAT3空突变的胚胎致死性,并且它本身可以诱导特定STAT3靶基因的表达。然而,STAT3α具有非冗余作用,例如调节细胞对IL-6的反应以及在巨噬细胞中介导IL-10的功能。

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