Science:研究提出更安全、更有效摧毁癌细胞的关键!

2017-10-07 枫丹白露 来宝网

由国立卫生研究院科学家领导的国际小组首先发现一种新的方式,细胞可以修复称为DNA-蛋白质交联(DPC)的重要和危险类型的DNA损伤。研究人员发现,一种名为ZATT的蛋白质可以在另一种蛋白质TDP2的帮助下消除DPCs。由于DPCs在个体接受某些类型的癌症治疗时形成,因此了解TDP2和ZATT如何共同修复损伤可能会改善癌症患者的健康状况。研究结果发表在“科学”杂志上。

癌症治疗引发的基因损伤可能被ZATT蛋白逆转】由国立卫生研究院科学家领导的国际小组首先发现一种新的方式,细胞可以修复称为DNA-蛋白质交联(DPC)的重要和危险类型的DNA损伤。研究人员发现,一种名为ZATT的蛋白质可以在另一种蛋白质TDP2的帮助下消除DPCs。由于DPCs在个体接受某些类型的癌症治疗时形成,因此了解TDP2和ZATT如何共同修复损伤可能会改善癌症患者的健康状况。研究结果发表在“科学”杂志上。

研究人员知道,TDP2对于去除DPC很重要,但根据相应的作者Scott Williams博士,基因组完整性和结构生物学实验室副主任Scott Williams博士说,他们不知道如何针对需要工作的地方。 NIHHS国立环境健康科学研究所(NIEHS),威廉姆斯和他的团队采用多管齐下的方法,将ZATT识别为此流程的新贡献者,并确定如何将TDP2引导到DPC,以便可以进行修复。

为了可视化这些蛋白质如何编织DPC修复,必须首先了解如何创建DPC。 NIEHS访问学者Matthew Schellenberg博士说,当DNA在细胞内缠结时,生物体使用称为拓扑异构酶2(TOP2)的蛋白来解开它。

“想象你的DNA是一条巨大的纱线,”谢伦伯格说。 “TOP2削减并重新检视个别线程来解开球。

Schellenberg解释说,TOP2通常将其切割的DNA末端隐藏在包围DNA的TOP2蛋白的核心内。这样做确保蛋白质可以完成其第二部分的工作,目的是重新加入DNA。然而,化疗药物或环境化学品有时会阻断蛋白质的DNA修复能力,使得TOP2仍然停留在DNA上。这种情况造成了稳定的TOP2-DPC复合物,导致细胞分裂的DNA的积累。

威廉姆斯比较了TOP2-DPC。他表示,这些分子由TOP2与环境毒素,化学代谢物,烟草暴露或紫外线造成的DNA损伤的相互作用所驱使。

他补充说,TOP2-DPC最有力地由人类利用以消除癌细胞的药物形成,使TOP2-DPC成为双刃剑。如果它们不被去除,则它们触发细胞死亡。虽然癌症药物诱导形成TOP2-DPC来治疗癌症,但TOP2-DPC病变也可能是疾病的根源,因为它们可能导致癌症的生物体基因组重排。为此,威廉姆斯和他的同事们说,有必要了解DPC的位置和具体细节。

威廉姆斯说:“在这项研究中,我们发现了一种新型的杀伤细胞分子治疗装置。 “ZATT就像是一只嗅探狗,所以当它定位目标时,动员招募TDP2似乎是一个闹钟,TDP2削减了红线以解除这些威胁。”

Schellenberg说,化疗药物,如依托泊苷,不是唯一诱导DPCs的药物。目前市面上的许多抗生素使用相同的方法来损伤细菌DNA。他表示,这项工作是更大的努力的一部分,以确定研究人员如何利用这一关键漏洞来改善健康。

Schellenberg说:“我们已经发现我们如何防御这种有效的细胞杀伤手段。 “我们希望这些信息能够开发针对这些防御的新药,通过降低防御力,我们可能会制造更有效杀死癌细胞的药物。”

原始出处:

Matthew J. Schellenberg et al, ZATT (ZNF451)–mediated resolution of topoisomerase 2 DNA-protein cross-links, Science (2017). DOI: 10.1126/science.aam6468.

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    2017-10-09 yxch36
  2. [GetPortalCommentsPageByObjectIdResponse(id=1252365, encodeId=3c78125236528, 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=27, 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=Mon Oct 09 01:48:00 CST 2017, time=2017-10-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1375703, encodeId=c69013e570364, content=<a href='/topic/show?id=2949159989d' target=_blank style='color:#2F92EE;'>#SCIE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15998, encryptionId=2949159989d, topicName=SCIE)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=17a3387, createdName=jichang, createdTime=Mon Oct 09 01:48:00 CST 2017, time=2017-10-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=251336, encodeId=ef5c2513368d, content=学习了.好文章, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20220115/46bcf39c32de4aa6b45c5f9d66c8ee77/6cb4a20c55bb4b7691122f47747bfca2.jpg, createdBy=9dad1662329, createdName=1ddf0692m34(暂无匿称), createdTime=Sun Oct 08 09:31:55 CST 2017, time=2017-10-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=251241, encodeId=02d02512419b, content=学习了学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160914/IMG57D82E721DB581755.jpg, createdBy=4fc81933929, createdName=明天会更好!, createdTime=Sun Oct 08 01:50:48 CST 2017, time=2017-10-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=251148, encodeId=bd37251148ef, content=henhao, beContent=null, objectType=article, channel=null, level=null, likeNumber=64, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NcXNhUvfhzd2VdicMnaLeK2Im5gKx4Ucxd8Bwu6S7RG0uILBFQx5HTW2bU4VricDYlQqN20ibASSMYAeGrZrrTpy2Q/0, createdBy=80d11516357, createdName=139****0239, createdTime=Sat Oct 07 15:28:08 CST 2017, time=2017-10-07, status=1, ipAttribution=)]
    2017-10-09 jichang
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    2017-10-08 1ddf0692m34(暂无匿称)

    学习了.好文章

    0

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    2017-10-08 明天会更好!

    学习了学习了

    0

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    2017-10-07 139****0239

    henhao

    0

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【科学家在胰腺肿瘤中发现代谢普通药物的细菌】在Science上发表的一项研究中,研究人员描述了人胰腺肿瘤内部某些细菌的发现。研究结果进一步表明,这些细菌中的一些含有一种用于治疗各种癌症(包括胰腺癌)的普通药物失活的酶。使用小鼠模型,他们表明为什么抗生素治疗化疗可能会显着优于单独化疗治疗。

Blood:是谁把体内的癌细胞“越养越肥”,科学家已经确定目标!

今天公布的一项新的研究揭示了血液癌症不断“茁壮成长”的根源,癌细胞窃取健康的骨髓细胞,获得癌症转移和生长的营养原料,这一发现有望在未来的工作中,开启抗癌的新方法。