Hepatology:微生物所叶昕研究组在HBV上调的lnc-HUR1调控肝癌发生的机制方面取得进展

2018-07-17 佚名 中国科学院微生物研究所

随着基因测序技术的发展,越来越多长链非编码RNA(lncRNA)被发现。LncRNA涉及到基因调节的各个方面,包括基因转录,mRNA剪切和核质穿梭等;它们在细胞增殖,分化和细胞凋亡等多种生物过程中发挥重要作用。LncRNA表达异常与多种疾病包括肿瘤的发生密切相关。

乙型肝炎病毒(hepatitis B virus, HBV)是严重影响人类健康的慢性感染性病毒。据WHO统计,2015年世界范围内约有2.57亿HBV慢性感染患者,约100万患者死于HBV慢性感染导致的肝硬化和肝癌等相关疾病。

随着基因测序技术的发展,越来越多长链非编码RNA(lncRNA)被发现。LncRNA涉及到基因调节的各个方面,包括基因转录,mRNA剪切和核质穿梭等;它们在细胞增殖,分化和细胞凋亡等多种生物过程中发挥重要作用。LncRNA表达异常与多种疾病包括肿瘤的发生密切相关。

为了探究HBV相关lncRNA在肝癌发生发展中的作用,叶昕课题组利用RNA深度测序技术比较了HBV阳性和阴性肝癌细胞的转录谱,发现一系列差异表达的lncRNAs,对其中在HBV阳性细胞中上调最为显著的lnc-HUR1展开了深入研究。结果表明HBV编码的HBx蛋白能促进lnc-HUR1的转录;肝癌患者临床样本分析数据显示,患者血清中HBV的拷贝数与肝组织中lnc-HUR1的水平呈正相关;功能实验表明lnc-HUR1能够促进肝癌细胞增殖,并且提高肝癌细胞在裸鼠中形成肿瘤的能力。通过RNA pull down和质谱分析发现lnc-HUR1能结合肿瘤抑制因子p53结合,进一步实验表明lnc-HUR1通过与p53的DNA结合区域结合,抑制p53的转录活性。利用lnc-HUR1转基因小鼠,进行肝切除/再生实验,发现与对照组小鼠相比,lnc-HUR1转基因小鼠的肝再生能力显著增强;DEN诱导肝癌模型实验显示lnc-HUR1明显促进小鼠肝脏肿瘤的形成。

该研究解析了HBV上调的长链非编码RNA lnc-HUR1在细胞增殖中的功能,阐明其通过抑制p53的转录活性进而促进细胞增殖的分子机制,揭示lnc-HUR1在肝再生和肝癌的发生发展中发挥重要作用。



该研究成果以Hepatitis B virus-upregulated lnc-HUR1 promotes cell proliferation and tumorigenesis by blocking p53 activity为题已于近日在《HEPATOLOGY》在线发表。微生物所助理研究员刘宁宁,博士生刘琪和硕士生杨小海为本文的共同第一作者,叶昕研究员为通讯作者。该研究得到了国家自然科学基金和国家重点研发计划资助。

原始出处:Ningning Liu,  Qi Liu,  Xiaohai Yang, et al. Hepatitis B virus‐upregulated lnc‐HUR1 promotes cell proliferation and tumorigenesis by blocking p53 activity. Hepatology. 23 May 2018 

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    2018-08-09 klivis
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    2018-07-20 GZphD9

    学习了

    0

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    2018-07-19 gwc384

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