The long noncoding RNA LUCAT1 promotes colorectal cancer cell proliferation by antagonizing Nucleolin to regulate MYC expression.

The long noncoding RNA LUCAT1 promotes colorectal cancer cell proliferation by antagonizing Nucleolin to regulate MYC expression.
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长链非编码RNA LUCAT1通过拮抗Nucleolin调节MYC表达促进结直肠癌细胞增殖

DOI:
10.1038/s41419-020-03095-4
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发表时间:
2020-10-23
影响因子:
9
通讯作者:
Lin C
Lin C
中科院分区:
生物学1区
文献类型:
--
作者:
Wu R;Li L;Bai Y;Yu B;Xie C;Wu H;Zhang Y;Huang L;Yan Y;Li X;Lin C

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最近有报道称,长非编码RNA(lncRNA)LUCAT1在多种癌症类型中上调并发挥重要作用,特别是结直肠癌(CRC),但LUCAT1在CRC中的分子机制大多尚未报道。在这里,我们利用 TCGA 数据库和临床 CRC 样本的数据对 LUACT1 表达进行了系统分析。 LUCAT1 被认为是一种假定的癌基因,在 CRC 中显着上调,并且与不良预后相关。 LUCAT1 的缺失限制了 CRC 体外和体内的增殖能力。机械上,通过 RNA 纯化染色质分离结合质谱 (ChIRP-MS) 和 RNA 免疫沉淀测定,NCL 被鉴定为 LUCAT1 的蛋白质结合伴侣。我们还表明,NCL 通过其假定的从核苷酸 717 到 746 的 G 四链体形成区域直接与 LUCAT1 结合。LUCAT1 和 NCL 之间的相互作用干扰 NCL 介导的 MYC 抑制并促进 MYC 的表达。缺乏 LUCAT1 的细胞表现出 MYC 表达降低,NCL 敲低可以挽救 LUCAT1 耗竭引起的 CRC 细胞增殖和 MYC 表达抑制。我们的结果表明,LUCAT1 通过其 G-四链体结构抑制 NCL 的功能,在 CRC 细胞增殖中发挥关键作用,并可能作为 CRC 的新预后生物标志物和有效治疗靶点。
The long noncoding RNA (lncRNA) LUCAT1 was recently reported to be upregulated and to play an essential role in multiple cancer types, especially colorectal cancer (CRC), but the molecular mechanisms of LUCAT1 in CRC are mostly unreported. Here, a systematic analysis of LUACT1 expression is performed with data from TCGA database and clinic CRC samples. LUCAT1 is identified as a putative oncogene, which is significantly upregulated in CRC and is associated with poor prognosis. Loss of LUCAT1 restricts CRC proliferative capacities in vitro and in vivo. Mechanically, NCL is identified as the protein binding partner of LUCAT1 by using chromatin isolation by RNA purification coupled with mass spectrometry (ChIRP-MS) and RNA immunoprecipitation assays. We also show that NCL directly binds to LUCAT1 via its putative G-quadruplex-forming regions from nucleotides 717 to 746. The interaction between LUCAT1 and NCL interferes NCL-mediated inhibition of MYC and promote the expression of MYC. Cells lacking LUCAT1 show a decreased MYC expression, and NCL knockdown rescue LUCAT1 depletion-induced inhibition of CRC cell proliferation and MYC expression. Our results suggest that LUCAT1 plays a critical role in CRC cell proliferation by inhibiting the function of NCL via its G-quadruplex structure and may serve as a new prognostic biomarker and effective therapeutic target for CRC.
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