Sci Transl Med:癌症疫苗研发理念重大变革!大部分肿瘤特异抗原来自非编码DNA

2018-12-07 佚名 学术经纬

日前,《科学》子刊《Science Translational Medicine》上发表了一篇可谓是“颠覆”癌症疫苗研发理念的重量级论文。来自蒙特利尔大学的一支团队发现,在过去十多年的研究里,我们可能从一开始就找错了方向。

日前,《科学》子刊《Science Translational Medicine》上发表了一篇可谓是“颠覆”癌症疫苗研发理念的重量级论文。来自蒙特利尔大学的一支团队发现,在过去十多年的研究里,我们可能从一开始就找错了方向。

在介绍这项研究前,我们先来看看癌症与免疫系统的关系。我们知道癌症是一种难治的疾病。但归根结底,癌细胞和正常细胞有诸多不同,理论上说是一种异物。而得到激活的免疫系统,能够有效对癌细胞展开攻击。今年夺得诺贝尔生理学或医学奖的免疫疗法,凭借的就是这样一种原理。

但目前获批上市的免疫疗法有一个局限:它们只能对大约20%的患者起效。为了让更多患者从中受益,许多科学家们正在开发新型的免疫疗法,而“癌症疫苗”就是最为热门的领域之一。相信所有人都接种过疫苗——它能让人免于特定疾病的困扰。如果“癌症疫苗”能够问世,岂不是就能对癌症产生免疫力?

理想很美好,然而研发的进展却不容乐观。科学家们发现,淋巴细胞对肿瘤的浸润越充分,其对肿瘤的杀伤力就越强,患者的生存率也就越高。这背后的关键,在于“肿瘤特异抗原”。我们了解到,癌细胞里会存在大量突变,因此在癌细胞的表面,会产生特异的抗原。它们就像是体内的“异物”,能够被免疫系统所识别。

为此,多年以来,科学家们一直把注意力放在癌细胞基因组的编码区,研究由这些突变基因产生的多肽或者蛋白质,能否用于癌症疫苗的研发。

他们失败了。目前,我们看到了不少希望,但希望始终没有变为抗癌的良药。

会不会是我们一开始就找错了方向呢?“编码蛋白质的DNA只占人类基因组的2%,”本研究的通讯作者Claude Perreault教授说道:“剩下的98%被认为是非编码DNA,这正是我们这项工作的重点关注对象。”或许,正是对于2%的执着,才让我们忽略了剩下的98%。

在2种鼠类的癌细胞系,以及7种人类原代肿瘤里,科学家们开发了一种全新的技术方法,能够找到相应的肿瘤特异抗原,并分析其来源。利用这种技术,40种肿瘤特异抗原浮出水面。正如科学家们所猜测的那样,来自非编码DNA的肿瘤特异抗原,占比约为90%!


大部分肿瘤特异性抗原来自非编码区

“利用标准的外显子检测方法,这些肿瘤特异抗原注定会被忽略。”研究人员们在论文里写道。

进一步的分析表明,这些抗原本身未必发生了变异——其背后的DNA可以没有出现突变。但由于细胞的癌变,这些相关区域的表达模式会出现变化。因此,这些抗原能区分癌细胞和正常细胞,且在多种癌症里都普遍存在。

而这些新发现的抗原,在小鼠实验中,取得了令人可喜的抗癌效果。研究人员先给小鼠注射了肿瘤特异的抗原,模拟疫苗的“接种”过程。随后,他们在小鼠体内注射白血病细胞,以求诱发癌症。


一些抗原能让小鼠对特定癌症产生免疫力

“不同的抗原,清除白血病的比例在10%-100%不等,” Perreault教授补充道:“有些抗原能够保护小鼠终生。我们重新注射入的新白血病细胞都没有引发癌症。这表明这些抗原有长期的效果。”

正如研究团队所言,他们希望这一发现能够给癌症疫苗的研发带来新的洞见,并早日在人类身上得到应用。或许未来有一天,预防肝癌、肺癌癌,就像注射牛痘(天花疫苗)一样简单,方便,有效!

原始出处:

Céline M. Laumont,et al.Noncoding regions are the main source of targetable tumor-specific antigens.Science Translational Medicine  05 Dec 2018:Vol. 10, Issue 470, eaau5516.

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    2019-01-11 bsmagic9140
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status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1623317, encodeId=29b2162331e1a, content=<a href='/topic/show?id=62a655263e9' target=_blank style='color:#2F92EE;'>#抗原#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=55263, encryptionId=62a655263e9, topicName=抗原)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f59b20519025, createdName=xiaoyeshuang, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=354798, encodeId=ee99354e9850, content=学习学习谢谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, 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  5. 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href='/topic/show?id=83f5e9250e9' target=_blank style='color:#2F92EE;'>#编码#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79250, encryptionId=83f5e9250e9, topicName=编码)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=b10a17056098, createdName=12498f6em12暂无昵称, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1609370, encodeId=e48f16093e09c, content=<a href='/topic/show?id=eb6b1145939' target=_blank style='color:#2F92EE;'>#Med#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11459, encryptionId=eb6b1145939, topicName=Med)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=hb2008ye, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1623317, encodeId=29b2162331e1a, content=<a href='/topic/show?id=62a655263e9' target=_blank style='color:#2F92EE;'>#抗原#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=55263, encryptionId=62a655263e9, topicName=抗原)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f59b20519025, createdName=xiaoyeshuang, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=354798, encodeId=ee99354e9850, content=学习学习谢谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTLbTp9nZtjwVrSZNxAXbAicnKQWnic2eBdJUQYhxO36XdkstSicr7FVF8p5ReH4omtmsbnLdvZLiaJJ1A/132, createdBy=8bff2327056, createdName=kafei, createdTime=Sat Dec 08 09:23:13 CST 2018, time=2018-12-08, status=1, ipAttribution=)]
    2018-12-09 lqvr
  6. 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status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1623317, encodeId=29b2162331e1a, content=<a href='/topic/show?id=62a655263e9' target=_blank style='color:#2F92EE;'>#抗原#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=55263, encryptionId=62a655263e9, topicName=抗原)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f59b20519025, createdName=xiaoyeshuang, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=354798, encodeId=ee99354e9850, content=学习学习谢谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTLbTp9nZtjwVrSZNxAXbAicnKQWnic2eBdJUQYhxO36XdkstSicr7FVF8p5ReH4omtmsbnLdvZLiaJJ1A/132, createdBy=8bff2327056, createdName=kafei, createdTime=Sat Dec 08 09:23:13 CST 2018, time=2018-12-08, status=1, ipAttribution=)]
  7. [GetPortalCommentsPageByObjectIdResponse(id=2067402, encodeId=ebb6206e4021f, content=<a href='/topic/show?id=d0841e75535' target=_blank style='color:#2F92EE;'>#Transl#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17755, encryptionId=d0841e75535, topicName=Transl)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdqq.qlogo.cn/qqapp/101173734/363C99735735B7F4CB11D5F78F580525/100, createdBy=aab22500211, createdName=ms3025846204744509, createdTime=Tue Mar 19 21:06:00 CST 2019, time=2019-03-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1743485, encodeId=c4c01e43485d4, content=<a href='/topic/show?id=369199618db' target=_blank style='color:#2F92EE;'>#非编码#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=99618, encryptionId=369199618db, 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href='/topic/show?id=83f5e9250e9' target=_blank style='color:#2F92EE;'>#编码#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=79250, encryptionId=83f5e9250e9, topicName=编码)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=b10a17056098, createdName=12498f6em12暂无昵称, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1609370, encodeId=e48f16093e09c, content=<a href='/topic/show?id=eb6b1145939' target=_blank style='color:#2F92EE;'>#Med#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=24, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11459, encryptionId=eb6b1145939, topicName=Med)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=hb2008ye, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1623317, encodeId=29b2162331e1a, content=<a href='/topic/show?id=62a655263e9' target=_blank style='color:#2F92EE;'>#抗原#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=55263, encryptionId=62a655263e9, topicName=抗原)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f59b20519025, createdName=xiaoyeshuang, createdTime=Sun Dec 09 10:06:00 CST 2018, time=2018-12-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=354798, encodeId=ee99354e9850, content=学习学习谢谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTLbTp9nZtjwVrSZNxAXbAicnKQWnic2eBdJUQYhxO36XdkstSicr7FVF8p5ReH4omtmsbnLdvZLiaJJ1A/132, createdBy=8bff2327056, createdName=kafei, createdTime=Sat Dec 08 09:23:13 CST 2018, time=2018-12-08, status=1, ipAttribution=)]
    2018-12-09 hb2008ye
  8. 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    2018-12-08 kafei

    学习学习谢谢

    0

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