Sam68 modulates the promoter specificity of NF-κB and mediates expression of CD25 in activated T cells.

Sam68 modulates the promoter specificity of NF-κB and mediates expression of CD25 in activated T cells.
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DOI:
10.1038/ncomms2916
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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CD25是白介素2受体的α链,表达于活化的T细胞中,在自身免疫性疾病和肿瘤发生中起重要作用;然而,CD25的转录调控机制仍不清楚。在这里,我们确定了68 kDa有丝分裂期间的Src相关底物(Sam68)是核因子-kappaB(NF-κB)复合体中的一个新的非REL组分,它提供CD25转录。我们的结果表明Sam68在T细胞中CD25的诱导和维持中起着重要的作用。T细胞受体的结合触发了核转录因子-κB激酶α抑制因子(IKKα)从胞浆到核的移位,在那里它使Sam68磷酸化,导致在核中与核因子-κB形成复合体。这些发现揭示了含有KH结构域的成分及其与IKK的空间相互作用在确定NF-κB复合体的结合靶点方面的重要作用,从而为了解NF-κB的调控特异性提供了新的见解。
CD25, the alpha chain of the interleukin-2 receptor, is expressed in activated T cells and plays a significant role in autoimmune disease and tumorigenesis; however, the mechanisms regulating transcription of CD25 remain elusive. Here we identify the Src-associated substrate during mitosis of 68kDa (Sam68) as a novel non-Rel component in the nuclear factor-kappaB (NF-κB) complex that confers CD25 transcription. Our results demonstrate that Sam68 plays an essential role in the induction and maintenance of CD25 in T cells. T cell receptor engagement triggers translocation of the inhibitor of NF-κB kinase alpha (IKKα) from the cytoplasm to the nucleus, where it phosphorylates Sam68, causing complex formation with NF-κB in the nucleus. These findings reveal the important roles of KH domain-containing components and their spatial interactions with IKKs in determining the binding targets of NF-κB complexes, thus shedding novel insights into the regulatory specificity of NF-κB.
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