Cell Stem Cell:中科院科学家在肝癌干细胞自我更新机制研究中取得新进展

2015-04-07 佚名 生物谷

2015年4月2日,中科院生物物理所范祖森课题组和陈润生院士课题组在国际权威期刊Cell Stem Cell杂志发表了题为“The long noncoding RNA lncTCF7 promotes self-renewal of human liver cancer stem cells through activation of Wnt signaling”的研究论文。文章报告了关于长

2015年4月2日,中科院生物物理所范祖森课题组和陈润生院士课题组在国际权威期刊Cell Stem Cell杂志发表了题为“The long noncoding RNA lncTCF7 promotes self-renewal of human liver cancer stem cells through activation of Wnt signaling”的研究论文。文章报告了关于长链非编码RNA lncTCF7调控人肝癌干细胞自我更新的作用及其分子机制的新发现。

研究人员通过转录组芯片鉴定了人肝癌干细胞和非干细胞中差异表达的长链非编码RNA,其中lncTCF7在人肝癌干细胞和肝癌组织中显著高表达,并且定位在细胞核中。沉默lncTCF7表达,显著下调肝癌细胞重要干性转录因子的表达和体外干细胞小球的形成能力,且在动物体内显着抑制肝癌的形成和生长。lncTCF7高表达,显著促进了肝癌干细胞的自我更新能力。进一步研究发现,lncTCF7主要通过调控TCF7而活化Wnt信号通路,从而激发肝癌干细胞的自我更新作用。lncTCF7通过招募染色质重塑复合物SWI/SNF,结合到TCF7基因的启动子区,启动TCF7基因的转录。沉默SWI/SNF组分的表达则显著抑制了TCF7的转录,从而阻止了Wnt信号的活化。综上所述,lncTCF7通过招募SWI/SNF复合物,激活Wnt信号通路,在肝癌干细胞自我更新的维持中发挥重要作用。我们的研究提示,lncRNA也可以作为肝癌发生发展的重要分子,可能将成为肿瘤临床干预的重要新靶点。

原发性肝癌是世界五大常见癌症之一,肝癌发病率和死亡率在我国位居世界前列。因此,攻克肝癌成为当前的国家需求,迫在眉睫。肝细胞癌是原发性肝癌的主要病理亚型,缺乏有效治疗药物,复发率高,发病机理尚未阐明。近年来,肿瘤干细胞学说受到高度关注和认同,肿瘤干细胞具有自我更新和可塑性潜能,在启动肿瘤形成和生长中起着决定性作用,现有的治疗措施尚无法针对肿瘤干细胞发挥作用,这可能是导致肝癌复发和耐药的主要原因。长链非编码RNA(lncRNA)是一类转录长度大于200个核苷酸且不编码蛋白质的RNA分子。在肿瘤研究方面,lncRNA可通过多种途径调控染色质重构、蛋白加工修饰等,从而影响效应蛋白质的功能。然而,lncRNA对肝癌干细胞自我更新的调控作用尚未见报道。

原始出处:

Yanying Wang1, 5, Lei He2, 5, Ying Du1, Pingping Zhu1, Guanling Huang1, 3, Jianjun Luo4, Xinlong Yan1, Buqing Ye1, Chong Li1, Pengyan Xia1, Geng Zhang1, Yong Tian4, Runsheng Chen4,Zusen Fan1, 3.The Long Noncoding RNA lncTCF7 Promotes Self-Renewal of Human Liver Cancer Stem Cells through Activation of Wnt Signaling.Cell Stem Cell.Volume 16, Issue 4, 2 April 2015, Pages 413–425.doi:10.1016/j.stem.2015.03.003

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    2016-01-05 gous
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  4. [GetPortalCommentsPageByObjectIdResponse(id=1862520, encodeId=ae701862520bb, content=<a href='/topic/show?id=a121223385b' target=_blank style='color:#2F92EE;'>#中科院#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=22338, encryptionId=a121223385b, topicName=中科院)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7a9987, createdName=gous, createdTime=Tue Jan 05 18:56:00 CST 2016, time=2016-01-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2056126, encodeId=456a20561267e, content=<a href='/topic/show?id=616b611e9bc' target=_blank style='color:#2F92EE;'>#机制研究#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=42, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=61179, encryptionId=616b611e9bc, topicName=机制研究)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=55ce62, createdName=hbwxf, createdTime=Wed Dec 09 02:56:00 CST 2015, time=2015-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869063, encodeId=547d1869063a6, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Sat Aug 22 17:56:00 CST 2015, time=2015-08-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1959314, encodeId=4950195931463, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Tue Jun 23 15:56:00 CST 2015, time=2015-06-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1805369, encodeId=910718053698b, content=<a href='/topic/show?id=9d42e801133' target=_blank style='color:#2F92EE;'>#细胞自我更新#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78011, encryptionId=9d42e801133, topicName=细胞自我更新)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c859411, createdName=hmwwww, createdTime=Mon Jul 20 10:56:00 CST 2015, time=2015-07-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1659298, encodeId=5b1a16592987c, content=<a href='/topic/show?id=7287861e2ed' target=_blank style='color:#2F92EE;'>#自我更新#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=86172, encryptionId=7287861e2ed, topicName=自我更新)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=764624964499, createdName=xsm926, createdTime=Sat Jan 23 14:56:00 CST 2016, time=2016-01-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1794384, encodeId=83cb1e9438493, content=<a href='/topic/show?id=82b416e79f5' target=_blank style='color:#2F92EE;'>#stem cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=16779, encryptionId=82b416e79f5, topicName=stem cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=hb2008ye, createdTime=Sun Aug 23 14:56:00 CST 2015, time=2015-08-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1481861, encodeId=e3a11481861d6, content=<a href='/topic/show?id=8cc416e78f3' target=_blank style='color:#2F92EE;'>#STEM#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=32, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=16778, encryptionId=8cc416e78f3, topicName=STEM)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d1067833268, createdName=12498bb3m92(暂无昵称), createdTime=Wed Apr 08 23:56:00 CST 2015, time=2015-04-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1544968, encodeId=23a81544968a1, content=<a href='/topic/show?id=7a0fe1289c2' target=_blank style='color:#2F92EE;'>#癌干细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=71289, encryptionId=7a0fe1289c2, topicName=癌干细胞)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=340013676140, createdName=1249898am19暂无昵称, createdTime=Wed Apr 08 23:56:00 CST 2015, time=2015-04-08, status=1, ipAttribution=)]
    2015-06-23 维他命
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