RNA-binding motif protein 47 inhibits Nrf2 activity to suppress tumor growth in lung adenocarcinoma.

RNA-binding motif protein 47 inhibits Nrf2 activity to suppress tumor growth in lung adenocarcinoma.
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DOI:
10.1038/onc.2016.35
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发表时间:
2016-09-22
期刊:
影响因子:
8
通讯作者:
Koinuma D
Koinuma D
中科院分区:
医学1区
文献类型:
--
作者:
Sakurai T;Isogaya K;Sakai S;Morikawa M;Morishita Y;Ehata S;Miyazono K;Koinuma D

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RNA结合蛋白在癌症进展过程中提供了一个新的RNA转录后调节层。我们鉴定了RNA结合基序蛋白47(RBM 47)作为转化生长因子(TGF)-β在经历上皮-间质转化的乳腺上皮细胞(NMuMG细胞)中的靶基因。TGF-β抑制NMuMG细胞和肺癌细胞系中RBM 47的表达。在肺癌、乳腺癌和胃癌患者中,RBM 47的表达与良好的预后相关。RBM 47抑制细胞代谢相关基因的表达,这些基因是核因子红细胞2相关因子2(Nrf 2;也称为NFE 2L 2)的直接靶点。RBM 47与KEAP 1和Cullin 3 mRNA结合,并且RBM 47的敲低抑制它们的蛋白质表达,这导致Nrf 2与靶基因组区域的结合增强。RBM 47的敲低还增强了TGF-β诱导的一些Nrf 2激活剂、p21/CDKN 1A和MafK的表达。在不存在RBM 47的情况下,肺癌细胞中的线粒体呼吸速率和侧群细胞均增加。我们的发现,连同通过敲低RBM 47表达而增强的异种移植小鼠的肿瘤形成和转移,表明RBM 47通过抑制Nrf 2活性而具有肿瘤抑制作用。
RNA-binding proteins provide a new layer of posttranscriptional regulation of RNA during cancer progression. We identified RNA-binding motif protein 47 (RBM47) as a target gene of transforming growth factor (TGF)-β in mammary gland epithelial cells (NMuMG cells) that have undergone the epithelial-to-mesenchymal transition. TGF-β repressed RBM47 expression in NMuMG cells and lung cancer cell lines. Expression of RBM47 correlated with good prognosis in patients with lung, breast and gastric cancer. RBM47 suppressed the expression of cell metabolism-related genes, which were the direct targets of nuclear factor erythroid 2-related factor 2 (Nrf2; also known as NFE2L2). RBM47 bound to KEAP1 and Cullin 3 mRNAs, and knockdown of RBM47 inhibited their protein expression, which led to enhanced binding of Nrf2 to target genomic regions. Knockdown of RBM47 also enhanced the expression of some Nrf2 activators, p21/CDKN1A and MafK induced by TGF-β. Both mitochondrial respiration rates and the side population cells in lung cancer cells increased in the absence of RBM47. Our findings, together with the enhanced tumor formation and metastasis of xenografted mice by knockdown of the RBM47 expression, suggested tumor-suppressive roles for RBM47 through the inhibition of Nrf2 activity.
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