Super-enhancer-associated circPVT1 promotes malignancy of hepatocellular carcinoma via YBX1-mediated RRM2 activation

IF 9.1 1区 医学 Q1 ONCOLOGY
Yunhao Chen , Chengli Du , Jie Tang , Yanchun Zhao , Haiyang Xie , Shusen Zheng , Zhengliang Tu
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Abstract

Circular RNAs (circRNAs), the essential members of epigenetic reprogramming, are emerging as an appealing layer in hepatocellular carcinoma (HCC). Super-enhancers (SEs) are large clusters of transcriptional enhancers with the tremendous gene activation potential and are extensively investigated in cancer research. The present study explores and uncovers an SE-related circRNA circPVT1, identifying its biological functions and downstream mechanisms in HCC. CircPVT1 is upregulated in HCC, serving as an independent prognostic factor for patients with HCC. Enrichment of H3K27ac and H3K4me1 modifications has been confirmed at the genomic loci of circPVT1's host gene, and the expression of circPVT1 is triggered by SEs. Functionally, circPVT1 enhances cell propagation and mobility capabilities in vitro, and facilitates tumour growth and metastasis in vivo. Mechanistically, circPVT1 recruits YBX1 into the cell nucleus, promoting the transcription of RRM2. Dysregulation of the circPVT1-RRM2 axis advances HCC malignancy, while inhibition of RRM2 or SE alleviates the effects of circPVT1 overexpression. In conclusion, our work demonstrates that circPVT1 is driven by super-enhancers. CircPVT1 promotes HCC progression via YBX1-mediated transcriptional activation of RRM2. These findings provide constructive insights into exploring the pathogenesis of HCC.
超增强子相关的CircPVT1通过ybx1介导的RRM2激活促进肝细胞癌的恶性化。
环状rna (circRNAs)是表观遗传重编程的重要成员,在肝细胞癌(HCC)中作为一个吸引人的层出现。超级增强子(super -enhancer, SEs)是一类具有巨大基因激活潜力的大型转录增强子群,在癌症研究中得到了广泛的研究。本研究探索并发现了一个se相关的circRNA circPVT1,确定了其在HCC中的生物学功能和下游机制。CircPVT1在HCC中表达上调,可作为HCC患者的独立预后因素。在circPVT1宿主基因的基因组位点上已经证实了H3K27ac和H3K4me1修饰的富集,circPVT1的表达是由SEs触发的。在功能上,circPVT1增强体外细胞繁殖和移动能力,促进体内肿瘤生长和转移。从机制上讲,circPVT1将YBX1招募到细胞核中,促进RRM2的转录。circPVT1-RRM2轴的失调会推进HCC恶性肿瘤,而抑制RRM2或SE可减轻circPVT1过表达的影响。总之,我们的工作表明circPVT1是由超级增强子驱动的。CircPVT1通过ybx1介导的RRM2转录激活促进HCC进展。这些发现为探索HCC的发病机制提供了建设性的见解。
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来源期刊
Cancer letters
Cancer letters 医学-肿瘤学
CiteScore
17.70
自引率
2.10%
发文量
427
审稿时长
15 days
期刊介绍: Cancer Letters is a reputable international journal that serves as a platform for significant and original contributions in cancer research. The journal welcomes both full-length articles and Mini Reviews in the wide-ranging field of basic and translational oncology. Furthermore, it frequently presents Special Issues that shed light on current and topical areas in cancer research. Cancer Letters is highly interested in various fundamental aspects that can cater to a diverse readership. These areas include the molecular genetics and cell biology of cancer, radiation biology, molecular pathology, hormones and cancer, viral oncology, metastasis, and chemoprevention. The journal actively focuses on experimental therapeutics, particularly the advancement of targeted therapies for personalized cancer medicine, such as metronomic chemotherapy. By publishing groundbreaking research and promoting advancements in cancer treatments, Cancer Letters aims to actively contribute to the fight against cancer and the improvement of patient outcomes.
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