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The long non-coding RNA PIK3CD-AS2 promotes lung adenocarcinoma progression via YBX1-mediated suppression of p53 pathway.
Oncogenesis ( IF 5.9 ) Pub Date : 2020-03-12 , DOI: 10.1038/s41389-020-0217-0
Xiufen Zheng 1, 2 , Junying Zhang 3 , Tian Fang 4 , Xiaoxiao Wang 5 , Siwei Wang 1 , Zhifei Ma 1 , Youtao Xu 1 , Chencheng Han 1 , Mengting Sun 6 , Lin Xu 1 , Jie Wang 1, 6, 7 , Rong Yin 1, 6, 7
Affiliation  

The underlying mechanisms of long non-coding RNAs (lncRNA) participating in the progression of lung cancers are largely unknown. We found a novel lncRNA, PIK3CD antisense RNA 2 (PIK3CD-AS2), that contributes to lung adenocarcinoma (LUAD) progression. The expression characteristics of PIK3CD-AS2 in LUAD were analyzed using microarray expression profile, The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO) datasets, and validated in 92 paired LUAD tissues by chromogenic in situ hybridization. Our data confirmed that PIK3CD-AS2 expression is a crucial regulator of LUAD progression and associated with shorter patient survival. In vitro studies showed that PIK3CD-AS2 increased cell growth and slowed apoptosis in p53wt cells but not in p53null cells. Mechanically, it is demonstrated that PIK3CD-AS2 bound to and maintained the stability of Y-box binding protein 1 (YBX1), a potent destabilizer of p53, by impeding its ubiquitination and degradation. Downexpression of YBX1 reversed PIK3CD-AS2-mediated inhibition of p53 signaling. Additionally, the therapeutic effect evaluation of a locked nuclear acid (LNA) specifically targeting PIK3CD-AS2 showed an anti-tumor activity in mice with A549 cells xenograft and p53 wild-type LUAD patient-derived tumor xenograft (PDTX) model. Clinically, the high expression of PIK3CD-AS2 showed a poor disease-free survival in p53 wild-type patients in TCGA database. Our findings suggest that PIK3CD-AS2 regulates LUAD progression and elucidate a new PIK3CD-AS2/YBX1/p53 signaling axis, providing a potential lncRNA-directed therapeutic strategy especially in p53 wild-type LUAD patients.

中文翻译:

较长的非编码RNA PIK3CD-AS2通过YBX1介导的p53途径抑制来促进肺腺癌的进展。

长的非编码RNA(lncRNA)参与肺癌进程的潜在机制在很大程度上是未知的。我们发现了一种新型的lncRNA,PIK3CD反义RNA 2(PIK3CD-AS2),它有助于肺腺癌(LUAD)的进展。使用微阵列表达谱,癌症基因组图谱(TCGA)和基因表达综合(GEO)数据集分析了PIK3CD-AS2在LUAD中的表达特征,并通过发色原位杂交在92个配对的LUAD组织中进行了验证。我们的数据证实,PIK3CD-AS2表达是LUAD进展的关键调节剂,并且与患者生存期较短有关。体外研究表明,PIK3CD-AS2可增加p53wt细胞的细胞生长并减缓其凋亡,而对p53null细胞却没有。机械上 结果表明,PIK3CD-AS2通过阻碍p53的泛素化和降解,与p53的有效去稳定剂Y-box结合蛋白1(YBX1)结合并保持稳定性。YBX1的下调逆转了PIK3CD-AS2介导的p53信号传导抑制。此外,对靶向PIK3CD-AS2的锁定核酸(LNA)的治疗效果评估显示,在具有A549细胞异种移植物和p53野生型LUAD患者源性肿瘤异种移植物(PDTX)模型的小鼠中,其抗肿瘤活性。临床上,在TCGA数据库中,高表达的PIK3CD-AS2在p53野生型患者中显示出较差的无病生存期。我们的发现表明PIK3CD-AS2调节LUAD进程并阐明新的PIK3CD-AS2 / YBX1 / p53信号轴,
更新日期:2020-03-12
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