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Cell Metab:肿瘤也是“瘾君子”

2017-10-10 欧阳沐 生物通

最新《Cell Metabolism》文章,间质组织ATF4途径可能是破坏肿瘤供应链的新靶标。


最新《Cell Metabolism》文章,间质组织ATF4途径可能是破坏肿瘤供应链的新靶标。



斯坦福Burnham Prebys医学发现研究所(SBP)和加州大学圣地亚哥分校的研究人员10月5日在《Cell Metabolism》发表文章,肿瘤通过消除周围间质组织的p62蛋白以获得更稳定的营养供给。具体来说,剥夺必需氨基酸谷氨酰胺条件下,p62缺乏有利于肿瘤和基质(肿瘤外的支持组织)生存。

文章表明,肿瘤基质的p62途径可能是一个潜在的抗肿瘤靶点。

“化疗是传统的靶向‘致癌基因瘾源’( oncogene addictions,肿瘤赖以生存的致瘤信号)的癌症治疗方法,”通讯作者SBP国立癌症研究所指定癌症中心教授Maria Diaz-Meco说。“我们正在寻找非致癌的瘾源,即有功能的、有助于癌症生存的非突变基因。例如,基质并非癌组织,但是它们却是支持肿瘤生长的主要组件。我们相信,不靶向突变的肿瘤细胞,而是靶向肿瘤和周围基质的代谢可能是找到新治疗方法的有效途径,因为无需考虑各种癌症突变类型。”

肿瘤挟持了周围组织,特别是基质中的癌症相关成纤维细胞,改造它们使其作为滋养癌症生长的巢穴。

“营养胁迫能限制部分肿瘤发展。但在更具侵袭性的形式下,限制肿瘤营养供给的效果就比较有限了。肿瘤消除了基质中的p62,让基质也变得更具侵袭性和炎性,从而为病灶提供相应支持。”

包括乳腺癌、前列腺癌、肝癌等很多肿瘤都采用了基质p62缺失策略。

由于肿瘤对这一机制“已经成瘾”,因此靶向它们或可导致不受耐药性影响的治疗方法。同时,基质不像肿瘤细胞那样容易突变,靶向基质的另一个好处是治疗过程将更为稳定。
在这项研究中,研究小组发现p62降低后,只有基质中的ATF4(使细胞适应非常需要营养局面的一个重要转录因子)水平升高。上皮细胞的ATF4水平无论p62多少都保持不变。

如果没有ATF4,在缺少谷氨酰胺的培养基中生长的基质细胞将停止生长。进一步实验表明,p62参与了ATF4的分解。谷氨酰胺限制引发的p62降低最终导致ATF4的不断累积。

丢弃p62获得ATF4的细胞进程激活了一个复杂的天冬氨酸生成途径,不仅让基质细胞,也让它们所环绕的肿瘤细胞继续存活生长。

从治疗角度来看,肿瘤不得不依赖这一途径来获取能量,因此ATF4是一个破坏癌症生长的极佳环节。

过去,p62曾被看作是肿瘤上皮细胞的专一癌症促进因子。但是它在基质中却扮演着不同角色。癌症内在的分子关系是如此复杂,作者认为,在现有医学条件下,人们有必要更深刻地理解基质和肿瘤进展之间的关系。“有关基质代谢影响肿瘤生长的研究实在太少了,但在开发更有效的、低毒治疗手段路线上,这是一道绕不过去的挑战。”

原始出处:

Juan F. Linares, Thekla Cordes, Angeles Duran,ET AL.ATF4-Induced Metabolic Reprograming Is a Synthetic Vulnerability of the p62-Deficient Tumor Stroma.cell-metabolism.DOI: http://dx.doi.org/10.1016/j.cmet.2017.09.001

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  2. [GetPortalCommentsPageByObjectIdResponse(id=1870207, encodeId=b9ed18e02073a, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=55, 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 Feb 03 01:37:00 CST 2018, time=2018-02-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1960468, encodeId=75a319604685d, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=64, 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=Mon Aug 27 14:37:00 CST 2018, time=2018-08-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1887737, encodeId=c5f5188e73786, content=<a href='/topic/show?id=d56611584ec' target=_blank style='color:#2F92EE;'>#Meta#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11584, encryptionId=d56611584ec, topicName=Meta)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d8f4110, createdName=guojianrong, createdTime=Wed Jan 31 18:37:00 CST 2018, time=2018-01-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=253414, encodeId=86272534143b, content=学习了谢谢分享!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=109, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20200816/e4675a86ea694f12b82202b320dc2654/12f6b900498349e994ce8f516a584d6a.jpg, createdBy=09431951290, createdName=大爰, createdTime=Mon Oct 16 13:25:02 CST 2017, time=2017-10-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=252030, encodeId=cee725203012, content=内容丰富.值得学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=85, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zMoyicyo6ia9f4IuLQAwZoxD6Hx4ibd5CMcOCYhStY6oDibbKK6O2X8iaicldO5ib8j1iapOIobIKCGiczU2A/0, createdBy=56251941490, createdName=虈亣靌, createdTime=Wed Oct 11 20:11:10 CST 2017, time=2017-10-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=251836, encodeId=90cf25183620, content=学习了谢谢了', beContent=null, objectType=article, channel=null, level=null, likeNumber=103, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mONcle9pic3zSn0GqHrsfLPeNmuNF9ibgMfMOAs7Iic5MpiaU8RLmRH67xCKuk5wzfhb7G4ib7ia6z9lrnsTicj1nAUfEOMecZDtvvu/0, createdBy=d7f91939785, createdName=186****0580(小山羊), createdTime=Wed Oct 11 00:44:11 CST 2017, time=2017-10-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1896162, encodeId=fec81896162ed, content=<a href='/topic/show?id=4a391158248' target=_blank style='color:#2F92EE;'>#MET#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11582, encryptionId=4a391158248, topicName=MET)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=18fc139, createdName=一闲, createdTime=Mon Nov 13 16:37:00 CST 2017, time=2017-11-13, status=1, ipAttribution=)]
    2018-08-27 维他命
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    2018-01-31 guojianrong
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    2017-10-16 大爰

    学习了谢谢分享!!

    0

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    2017-10-11 虈亣靌

    内容丰富.值得学习

    0

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    2017-10-11 186****0580(小山羊)

    学习了谢谢了'

    0

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    2017-11-13 一闲

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