The DDX39B/FUT3/TGFβR-I axis promotes tumor metastasis and EMT in colorectal cancer.

The DDX39B/FUT3/TGFβR-I axis promotes tumor metastasis and EMT in colorectal cancer.
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DOI:
10.1038/s41419-020-03360-6
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发表时间:
2021-01-12
影响因子:
9
通讯作者:
Li Q
Li Q
中科院分区:
生物学1区
文献类型:
--
作者:
He C;Li A;Lai Q;Ding J;Yan Q;Liu S;Li Q

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DDX 39 B是几乎所有细胞RNA代谢过程所需的DEAD box(DDX)RNA解旋酶家族的成员。DDX 39 B在结直肠癌发生发展中的确切作用及其分子机制尚待进一步研究。在本研究中,我们证明了DDX 39 B在结直肠癌组织中的表达高于邻近的正常组织。功能获得和功能丧失测定揭示DDX 39 B促进体内和体外CRC转移。从机制上讲,RNA测序(RNA-seq)和RNA结合蛋白免疫沉淀测序(RIP-seq)显示DDX 39 B直接结合FUT 3前mRNA并上调FUT 3表达。使用Minigene测定的体外剪接实验证实DDX 39 B促进FUT 3前mRNA剪接。细胞核和细胞质RNA分离测定表明DDX 39 B增强FUT 3的mRNA输出。FUT 3的上调加速了TGFβR-I的岩藻糖基化,其激活TGFβ信号通路并最终驱动上皮-间充质转化(EMT)程序并有助于CRC进展。这些发现不仅为DDX 39 B在mRNA剪接和输出以及肿瘤发生中的作用提供了新的见解,而且还阐明了异常岩藻糖基化对CRC进展的影响。
DDX39B is a member of the DEAD box (DDX) RNA helicase family required for nearly all cellular RNA metabolic processes. The exact role and potential molecular mechanism of DDX39B in the progression of human colorectal cancer (CRC) remain to be investigated. In the present study, we demonstrate that DDX39B expression is higher in CRC tissues than in adjacent normal tissues. Gain- and loss-of-function assays revealed that DDX39B facilitates CRC metastasis in vivo and in vitro. Mechanistically, RNA-sequencing (RNA-seq) and RNA-binding protein immunoprecipitation-sequencing (RIP-seq) showed that DDX39B binds directly to the FUT3 pre-mRNA and upregulates FUT3 expression. Splicing experiments in vitro using a Minigene assay confirmed that DDX39B promotes FUT3 pre-mRNA splicing. A nuclear and cytoplasmic RNA separation assay indicates that DDX39B enhances the mRNA export of FUT3. Upregulation of FUT3 accelerates the fucosylation of TGFβR-I, which activates the TGFβ signaling pathway and eventually drives the epithelial–mesenchymal transition (EMT) program and contributes to CRC progression. These findings not only provide new insight into the role of DDX39B in mRNA splicing and export as well as in tumorigenesis, but also shed light on the effects of aberrant fucosylation on CRC progression.
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