J Exp Med:肠道微生物助力CD47抑制剂对抗肿瘤

2020-03-21 Walter 转化医学网

近日,德克萨斯大学西南医学中心的Xinyang Fut团队在《实验医学杂志》JEM上发表重要结果,发现肠道中的细菌能在肿瘤中蓄积;使用双歧杆菌辅助治疗,可能有效提高CD47免疫疗法的疗效。

CD47是肿瘤靶向免疫治疗的基础之一。CD47作为重要的“免疫检查点”分子,在多种肿瘤细胞中广泛过表达,抑制巨噬细胞对肿瘤的吞噬作用;激活CD47-SIRPα信号影响T细胞功能,从而使肿瘤从免疫系统识别和杀伤中逃逸。尽管靶向CD47的阻断药物展现出蓬勃的发展前景,但有效性和个体差异尚待商榷。

近日,德克萨斯大学西南医学中心的Xinyang Fut团队在《实验医学杂志》JEM上发表重要结果,发现肠道中的细菌能在肿瘤中蓄积;使用双歧杆菌辅助治疗,可能有效提高CD47免疫疗法的疗效。

研究者比较了不同环境中饲养的两种荷瘤小鼠,发现它们对抗CD47治疗的反应差异取决于肠道菌群类型不同。接着,研究者将两者同笼饲养三周,发现两种小鼠均显示出对CD47抗体治疗的反应,说明两者接触后所获得对方的菌群促进了肿瘤对CD47抗体产生反应。

小鼠对抗CD47治疗的反应与肠道菌群种类有关

接着,研究者用抗生素杀死抗CD47治疗有效组小鼠肠道中的细菌,发现药物的作用消失;反之,对抗CD47治疗无效组小鼠补充双歧杆菌,药物治疗产生了显着抗肿瘤效果。

双歧杆菌的辅助对CD47抗体疗效至关重要

令人惊讶的是,双歧杆菌不仅在肠道累积,还能够迁移到肿瘤组织中,进一步活化DC细胞中的干扰素基因刺激因子(STING)免疫信号通路,使肿瘤重新暴露在获得性免疫系统的攻击之下。研究者发现,基因改造后1型干扰素缺失,或者STING通路受阻的小鼠均无法从细菌-免疫疗法中获益,说明STING信号通路在CD47抗体治疗中扮演着至关重要的角色。

本研究解释了临床上某些患者使用CD47抗体和阻断剂无效的原因,可能由于肠道菌群中的双歧杆菌缺失。使用双歧杆菌补充剂与CD47抗体联合治疗,可能大大强化临床现有药物的治疗效果,扩大适用范围,具有广阔的发展前景!

原始出处:Yaoyao Shi , Wenxin Zheng , Kaiting Yang, et al. Intratumoral accumulation of gut microbiota facilitates CD47-based immunotherapy via STING signaling.  J Exp Med. 06 Mar, 2020.

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    2020-07-10 jklm09
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    2020-06-17 qidongfanjian
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    2020-03-22 飛歌

    学习了不错哦

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1852304, encodeId=b9881852304fa, content=<a href='/topic/show?id=f0a254918f0' target=_blank style='color:#2F92EE;'>#抑制剂#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=54918, encryptionId=f0a254918f0, topicName=抑制剂)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=44a360, createdName=jklm09, createdTime=Fri Jul 10 08:09:51 CST 2020, time=2020-07-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1825127, encodeId=73d1182512e94, content=<a href='/topic/show?id=702a5065860' target=_blank style='color:#2F92EE;'>#微生物#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=50658, encryptionId=702a5065860, topicName=微生物)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=0b7c20, createdName=wjcjjian, createdTime=Fri Aug 07 10:09:51 CST 2020, time=2020-08-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1864273, encodeId=afd318642e3b4, content=<a href='/topic/show?id=f930432538' target=_blank style='color:#2F92EE;'>#CD4#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4325, encryptionId=f930432538, topicName=CD4)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b09892, createdName=qidongfanjian, createdTime=Wed Jun 17 10:09:51 CST 2020, time=2020-06-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1610381, encodeId=4f1116103816b, content=<a href='/topic/show?id=eb6b1145939' target=_blank style='color:#2F92EE;'>#Med#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11459, encryptionId=eb6b1145939, topicName=Med)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=552a19396740, createdName=ms3994565386320060, createdTime=Mon Mar 23 13:09:51 CST 2020, time=2020-03-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=380821, encodeId=dc0938082177, content=学习了不错哦, beContent=null, objectType=article, channel=null, level=null, likeNumber=79, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Sun Mar 22 00:33:05 CST 2020, time=2020-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=380817, encodeId=374338081ee0, content=学习了,谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7c592194322, createdName=1209e435m98(暂无昵称), createdTime=Sat Mar 21 23:16:20 CST 2020, time=2020-03-21, status=1, ipAttribution=)]
    2020-03-21 1209e435m98(暂无昵称)

    学习了,谢谢分享

    0