Long noncoding RNA RHPN1-AS1 promotes hepatocellular carcinoma progression under hypoxia through interaction with RPS15A protein.

IF 3.5 4区 医学 Q2 ONCOLOGY
Qin Peng, Yu-Ting Cai, Qi Ding, Xiang-Yun Qian, Cong Xu, Hang-Cheng Zhou, Hao Chen, Heng Li, Wei Wang
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Abstract

Hypoxic microenvironment is a hallmark feature of hepatocellular carcinoma (HCC) and contributes to cancer progression. RHPN1-AS1, a long noncoding RNA (lncRNA), plays an important role in multiple cancers. However, its expression and oncogenic function under hypoxic conditions have not yet been determined. In this study, we investigated the expression changes of RHPN1-AS1 in HCC cells upon hypoxia. The effects of RHPN1-AS1 knockdown and overexpression on hypoxic HCC cells were explored. The protein partner involved in RHPN1-AS1 action in hypoxic HCC cells was characterized. We found that exposure to hypoxia led to an increase in the RHPN1-AS1 level in HCC cells, which was blocked by depletion of HIF-1α. Chromatin immunoprecipitation assay revealed the enrichment of HIF-1α at the promoter of RHPN1-AS1 in hypoxic HCC cells. Knockdown of RHPN1-AS1 suppressed HCC cell proliferation, colony formation, and invasion under hypoxia, whereas overexpression of RHPN1-AS1 promoted the proliferation and invasion of hypoxic HCC cells. Mechanistically, RHPN1-AS1 interacted with and stabilized RPS15A protein in hypoxic HCC cells. Elevated expression of RPS15A protein enhanced the proliferation and invasion of hypoxic HCC cells through activation of β-catenin signaling. Silencing of RPS15A attenuated RHPN1-AS1-induced aggressiveness and β-catenin activation in hypoxic HCC cells. In vivo tumorigenic studies confirmed that RPS15A depletion significantly reduced the growth of RHPN1-AS1-overexpressing HCC xenograft tumors. RHPN1-AS1 serves as a hypoxia-responsive lncRNA and interacts with the RPS15A protein partner to activate the β-catenin pathway, consequently enhancing HCC progression under hypoxia.

长链非编码RNA rpsn1 - as1通过与RPS15A蛋白相互作用促进缺氧条件下肝细胞癌的进展。
低氧微环境是肝细胞癌(HCC)的一个标志性特征,并有助于癌症的进展。RHPN1-AS1是一种长链非编码RNA (lncRNA),在多种癌症中发挥重要作用。然而,其在缺氧条件下的表达和致癌功能尚未确定。在本研究中,我们研究了缺氧条件下RHPN1-AS1在HCC细胞中的表达变化。探讨RHPN1-AS1基因敲低和过表达对缺氧HCC细胞的影响。表征了缺氧HCC细胞中参与RHPN1-AS1作用的蛋白伴侣。我们发现,暴露于缺氧导致HCC细胞中RHPN1-AS1水平的增加,这被HIF-1α的耗尽所阻断。染色质免疫沉淀法发现缺氧HCC细胞RHPN1-AS1启动子处HIF-1α富集。低表达RHPN1-AS1可抑制缺氧条件下肝癌细胞的增殖、集落形成和侵袭,而过表达RHPN1-AS1可促进缺氧条件下肝癌细胞的增殖和侵袭。机制上,rpsn1 - as1在缺氧HCC细胞中与RPS15A蛋白相互作用并稳定RPS15A蛋白。RPS15A蛋白的表达升高通过激活β-catenin信号通路促进缺氧HCC细胞的增殖和侵袭。RPS15A的沉默可减弱rpsn1 - as1在缺氧HCC细胞中诱导的侵袭性和β-连环蛋白的激活。体内致瘤性研究证实,RPS15A缺失可显著降低过表达rhpn1 - as1的HCC异种移植肿瘤的生长。RHPN1-AS1作为低氧反应lncRNA,与RPS15A蛋白伴侣相互作用激活β-catenin通路,从而促进缺氧下HCC的进展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Medical Oncology
Medical Oncology 医学-肿瘤学
CiteScore
4.20
自引率
2.90%
发文量
259
审稿时长
1.4 months
期刊介绍: Medical Oncology (MO) communicates the results of clinical and experimental research in oncology and hematology, particularly experimental therapeutics within the fields of immunotherapy and chemotherapy. It also provides state-of-the-art reviews on clinical and experimental therapies. Topics covered include immunobiology, pathogenesis, and treatment of malignant tumors.
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