LncRNA SNHG17 interacts with LRPPRC to stabilize c-Myc protein and promote G1/S transition and cell proliferation.

LncRNA SNHG17 interacts with LRPPRC to stabilize c-Myc protein and promote G1/S transition and cell proliferation.
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LncRNA SNHG17 与 LRPPRC 相互作用稳定 c-Myc 蛋白并促进 G1/S 转变和细胞增殖

DOI:
10.1038/s41419-021-04238-x
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发表时间:
2021-10-20
影响因子:
9
通讯作者:
Zhuang SM
Zhuang SM
中科院分区:
生物学1区
文献类型:
--
作者:
Liu JY;Chen YJ;Feng HH;Chen ZL;Wang YL;Yang JE;Zhuang SM

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致癌 c-Myc 是 G1/S 转变的主要调节因子。长非编码 RNA (lncRNA) 成为各种细胞活动的新调节因子。在这里,我们发现 lncRNA SnoRNA 宿主基因 17 (SNHG17) 在细胞周期早期 G1 期升高。功能获得和丧失的研究均表明,SNHG17 增加了 c-Myc 蛋白水平,加速了 G1/S 转变和细胞增殖,从而促进了体外和体内肿瘤细胞的生长。从机制上讲,SNHG17 的 1-150-nt 与富含亮氨酸的五肽重复序列 (LRPPRC) 蛋白的 1035-1369-aa 发生物理相互作用,破坏这种相互作用会消除 SNHG17 在 c-Myc 表达、G1/S 转变和细胞增殖中的促进作用。沉默 c-Myc 或 LRPPRC 可以减弱 SNHG17 刺激细胞增殖的作用。此外,沉默 SNHG17 或 LRPPRC 会增加泛素化 c-Myc 的水平,并降低 c-Myc 蛋白的稳定性。对人肝细胞癌(HCC)组织的分析表明,SNHG17、LRPPRC和c-Myc在HCC中显着上调,并且它们之间呈正相关。高水平的 SNHG17 或 LRPPRC 与 HCC 患者的生存率较差相关。这些数据表明SNHG17可能抑制c-Myc泛素化,从而提高c-Myc水平并通过与LRPPRC相互作用促进增殖。我们的研究结果确定了一个新的 SNHG17-LRPPRC-c-Myc 调节轴,并阐明了其在 G1/S 转变和肿瘤生长中的作用,这可能为癌症治疗提供潜在靶点。
Oncogenic c-Myc is a master regulator of G1/S transition. Long non-coding RNAs (lncRNAs) emerge as new regulators of various cell activities. Here, we found that lncRNA SnoRNA Host Gene 17 (SNHG17) was elevated at the early G1-phase of cell cycle. Both gain- and loss-of function studies disclosed that SNHG17 increased c-Myc protein level, accelerated G1/S transition and cell proliferation, and consequently promoted tumor cell growth in vitro and in vivo. Mechanistically, the 1-150-nt of SNHG17 physically interacted with the 1035-1369-aa of leucine rich pentatricopeptide repeat containing (LRPPRC) protein, and disrupting this interaction abrogated the promoting role of SNHG17 in c-Myc expression, G1/S transition, and cell proliferation. The effect of SNHG17 in stimulating cell proliferation was attenuated by silencing c-Myc or LRPPRC. Furthermore, silencing SNHG17 or LRPPRC increased the level of ubiquitylated c-Myc and reduced the stability of c-Myc protein. Analysis of human hepatocellular carcinoma (HCC) tissues revealed that SNHG17, LRPPRC, and c-Myc were significantly upregulated in HCC, and they showed a positive correlation with each other. High level of SNHG17 or LRPPRC was associated with worse survival of HCC patients. These data suggest that SNHG17 may inhibit c-Myc ubiquitination and thus enhance c-Myc level and facilitate proliferation by interacting with LRPPRC. Our findings identify a novel SNHG17-LRPPRC-c-Myc regulatory axis and elucidate its roles in G1/S transition and tumor growth, which may provide potential targets for cancer therapy.
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