Ribosome profiling analysis identified a KRAS-interacting microprotein that represses oncogenic signaling in hepatocellular carcinoma cells

Ribosome profiling analysis identified a KRAS-interacting microprotein that represses oncogenic signaling in hepatocellular carcinoma cells
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核糖体分析发现了一种与 KRAS 相互作用的微生物蛋白,可抑制肝细胞癌细胞中的致癌信号传导

DOI:
10.1007/s11427-019-9580-5
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发表时间:
2019-06
期刊:
SCIENCE CHINA Life Sciences
影响因子:
--
通讯作者:
Lianghu Qu
Lianghu Qu
中科院分区:
其他
文献类型:
--
作者:
Wenli Xu;Bing Deng;Penghui Lin;Chang Liu;Bin Li;Qiaojuan Huang;Hui Zhou;Jianhua Yang;Lianghu Qu

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长链非编码rna (lncRNAs)编码的隐藏微蛋白的作用逐渐被揭示,但其在肿瘤发生中的功能仍不清楚。在这里,我们鉴定并表征了一个保守的99个氨基酸的微蛋白,名为KRASIM,由假定的lncRNA NCBP2-AS2编码。KRASIM在正常肝细胞和肝细胞癌(HCC)细胞中差异表达,可以抑制HCC细胞的生长和增殖。在机制上,KRASIM与人hh -7肝癌细胞细胞质中的KRAS蛋白相互作用并共定位。更重要的是,KRASIM的过表达降低了KRAS蛋白水平,导致HCC细胞中ERK信号活性受到抑制。这些结果首次证明了KRAS通路的一种新的微蛋白抑制因子,并为致癌信号传导和HCC治疗的调控机制提供了新的见解。
The roles of concealed microproteins encoded by long noncoding RNAs (lncRNAs) are gradually being exposed, but their functions in tumorigenesis are still largely unclear. Here, we identify and characterize a conserved 99-amino acid microprotein named KRASIM that is encoded by the putative lncRNA NCBP2-AS2. KRASIM is differentially expressed in normal hepatocytes and hepatocellular carcinoma (HCC) cells and can suppress HCC cell growth and proliferation. Mechanistically, KRASIM interacts and colocalizes with the KRAS protein in the cytoplasm of human HuH-7 hepatoma cells. More importantly, the overexpression of KRASIM decreases the KRAS protein level, leading to the inhibition of ERK signaling activity in HCC cells. These results demonstrate a novel microprotein repressor of the KRAS pathway for the first time and provide new insights into the regulatory mechanisms of oncogenic signaling and HCC therapy.
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