Sci Rep:罪魁祸首现身!昼夜节律基因竟是脑癌细胞不死关键!

2018-09-13 Ruthy,Zoe 转化医学网

美国脑肿瘤学会大卫·阿伦斯曾表示,胶质母细胞瘤(GBM)是世界上最复杂、最具耐药性和适应性的癌症之一。

导  读

美国脑肿瘤学会大卫·阿伦斯曾表示,胶质母细胞瘤(GBM)是世界上最复杂、最具耐药性和适应性的癌症之一。其生长速度快、病程短、死亡率极高,大多数该病患者在确诊后两年内死亡,尤其是老年患者,5年生存率不足5%,其治疗难题至今仍让肿瘤学研究者捉襟见肘。近日,曙光来临,弗吉尼亚理工学院Carilion研究所的研究人员在著名学术期刊《Scientific Reports》发表的文章揭示了GBM细胞“长寿”的机密!昼夜节律基因—CSNK1E,竟然是脑癌细胞“永葆青春”的关键!而这个基因有望成为脑癌治疗的重要靶点!

所谓癌细胞“长寿”,其实就是癌细胞具有源源不断的分裂活力。相较于其他癌症,GBM更是有过之而无不及,其可由15-20种不同的细胞组成,在大脑丰富的血管网络支持下,肿瘤细胞得以快速生长,还可以持续地分裂,不断扩散,而复杂的大脑结构让诸多疗法只能望洋兴叹。

因此,要彻底根除GBM,最重要的就是揪出让癌细胞“长寿”的罪魁祸首!只要让癌细胞步入正常生死节律,就有希望全歼癌细胞,告别GBM!

针对对癌细胞“长寿”根源的相关研究倒非首开先河,但此次研究人员首次将目光凝注于GBM的细胞节律问题。

他们认为,脑癌细胞之所以“青春永驻”,最重要的缘由就是它们跳出了正常细胞的生死节律,因而永葆干细胞“无限分裂”的能力。那么,癌细胞是如何逃脱生死关的呢?


CSNK1E在GBM中过表达

这就要归咎于一个昼夜节律基因—CSNK1E了。这个基因编码丝氨酸/苏氨酸蛋白激酶和酪蛋白激酶I蛋白家族的成员,这些蛋白质可参与DNA复制和修复,但在正常细胞中,其主要功能是磷酸化昼夜节律蛋白Period家族成员,从而调控细胞正常生长发育节律。

也就是说,正常情况下CSNK1E蛋白忙于调控节律,无暇顾及DNA复制和修复,而在GBM中,研究人员发现了CSNK1E的超量表达!富余的蛋白质干嘛去了?跑出折腾DNA了!


CSNK1E对GBM细胞存活至关重要


CSNK1E蛋白调节β-连环蛋白活性和自我更新

富余的CSNK1E蛋白是怎么“勾搭”上DNA复制和修复通路的?那就要提一下“躺着也中枪”的另一个蛋白质—β-连环蛋白。β-连环蛋白是一种多功能蛋白,在细胞核内充当转录因子,可以启动促使细胞分裂的基因。正常细胞走向衰亡时,细胞核外环境中的β-连环蛋白激活信号缺乏,使β-连环蛋白被挡在细胞核外,形成破坏复合物,最终降解。

而GBM中富余的CSNK1E蛋白能够让其从这种破坏复合体中释放出来,调节β-连环蛋白活性和自我更新,并迁移到细胞核中,重新启动细胞分裂基因,促进DNA复制和修复,癌细胞从而获得无穷无尽的分裂能力。


IC261通过降解β-连环蛋白诱导GBM细胞死亡

所以,我们是否可以推断,如果能阻断癌细胞中CSNK1E的过表达,就能使细胞核外β-连环蛋白成功降解,让细胞不再无限增殖,走向死亡?

研究人员用CSNK1E抑制剂IC261作用于GBM小鼠模型,发现IC261可强烈抑制GBM的生长,细胞分析显示用药后小鼠细胞核外β-连环蛋白大量降解,GBM细胞大量死亡!也就是说CSNK1E是GBM治疗的有效靶点!


IC261有效阻断GBM干细胞

更有意思的是,研究人员发现CSNK1E抑制剂还可以有效杀死GBM干细胞!脑癌治疗过程中,只要有几百个GBM干细胞存活,癌症就会复发。

他们指出,CSNK1E可以保证癌症干细胞分裂的有效性,因此,CSNK1E抑制剂可以彻底阻断癌症干细胞分裂,诱导其死亡!也就是说,CSNK1E抑制剂有望彻底杜绝GBM的复发!

这对GBM患者来说无异于拨云见日,毕竟现已有几款CSNK1E抑制剂已上市,同时,这也提出了研制GBM化学抑制剂的可能性。当然,目前该成果只在小鼠实验中获得,故需要更多实验和临床数据加以验证。假以时日,这项成果或有望成为我们告别GBM的希望,我们期待那一日的到来。

原始出处:Robin T. Varghese, Sarah Young, Lily Pham, et al. Casein Kinase 1 Epsilon Regulates Glioblastoma Cell Survival. Scientific Report. 11 September 2018

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    2018-09-23 1e1e5b26m21(暂无匿称)

    结果驴唇对马嘴……不知道怎么发表的

    0

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    2018-09-16 一天没事干

    很好的学习机会

    0

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    2018-09-14 yxch36
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  5. [GetPortalCommentsPageByObjectIdResponse(id=346224, encodeId=f2ce34622442, content=结果驴唇对马嘴……不知道怎么发表的, beContent=null, objectType=article, channel=null, level=null, likeNumber=74, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=03cb2008858, createdName=1e1e5b26m21(暂无匿称), createdTime=Sun Sep 23 00:15:32 CST 2018, time=2018-09-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=345227, encodeId=0bc834522e33, content=很好的学习机会, beContent=null, objectType=article, channel=null, level=null, likeNumber=91, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2018/04/12/cd30eefc465f70dc4dad89bd57479781.jpg, createdBy=02be2318568, createdName=一天没事干, createdTime=Sun Sep 16 10:42:58 CST 2018, time=2018-09-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1252539, encodeId=8f8b12525395e, content=<a href='/topic/show?id=3efee1519b2' target=_blank style='color:#2F92EE;'>#癌细胞#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=71519, encryptionId=3efee1519b2, topicName=癌细胞)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4cea26, createdName=yxch36, createdTime=Fri Sep 14 16:06:00 CST 2018, time=2018-09-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1391891, encodeId=3c7b1391891e6, content=<a href='/topic/show?id=085c8495615' target=_blank style='color:#2F92EE;'>#脑癌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=84956, encryptionId=085c8495615, topicName=脑癌)], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTKQHWdlyPWPmuHjfEXicudmC0dJ6SN5PHzglbDHibXpT1VXF2fKDnTzl2Eib4Pf94p58cnSKA3ZfGdFQ/132, createdBy=c44f2500101, createdName=ms2694732865965676, createdTime=Fri Sep 14 16:06:00 CST 2018, time=2018-09-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=344943, encodeId=300e344943ef, content=学习谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=71, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4Nd44v3xHnnictn9UpctwtH62EPQ59TMdI9lnqHMgQ16nH7GmGCfpzicsHgjibYVk6vwSpXrC86gMibRkoaIzf5HwSz7/0, createdBy=78cc1691107, createdName=龙胆草, createdTime=Fri Sep 14 08:45:02 CST 2018, time=2018-09-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=344798, encodeId=fc28344e988e, content=谢谢分享,学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=69, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo6Nx0VGA4QMDzOP8oAgnV4h51EjSfehJ9QxyiaSmw8PB56BhY8KXFSxHCibXrzcy4abrzSibXQPxJ9kzrLcJyhhB8a/0, createdBy=1d3b1672603, createdName=明月清辉, createdTime=Thu Sep 13 07:46:25 CST 2018, time=2018-09-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=344762, encodeId=cd95344e623c, content=谢谢分享,学习了。, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2018/07/16/3b24606172648eea459125cb74754afe.jpg, createdBy=6c022216608, createdName=liumin1987, createdTime=Thu Sep 13 06:22:13 CST 2018, time=2018-09-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=344759, encodeId=1c7f344e5985, content=好好好好好好好好, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/08/29/bbc5cc0eed9b8d17623d2fd49dbdf19a.jpg, createdBy=79522135794, createdName=yjs木玉, createdTime=Thu Sep 13 05:14:10 CST 2018, time=2018-09-13, status=1, ipAttribution=)]
    2018-09-14 龙胆草

    学习谢谢分享

    0

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    2018-09-13 明月清辉

    谢谢分享,学习了

    0

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    2018-09-13 liumin1987

    谢谢分享,学习了。

    0

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    2018-09-13 yjs木玉

    好好好好好好好好

    0

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