Blood:CD19-CAR-T细胞的内源性TCR表达的去留?

2020-06-07 QQY MedSci原创

抗CD19-CAR表达的CRISPR/Cas9介导的T细胞受体敲除使allo-CAR-T细胞治疗成为可能;内源性TCR和CD19-CAR的共表达延长了T细胞的体内持久性。

抗CD19嵌合抗原受体(CAR) T细胞在B前体急性淋巴细胞白血病(ALL)中表现出显著的抗白血病活性。异体的、HLA不匹配的现成的第三代捐赠者可能提供了对效应细胞的理想适应度,但有发生移植物抗宿主病(GVHD)的风险。敲除CD19-CAR-T细胞的内源性T细胞受体(TCR)可能是一个有前途的解决方案。

在本研究中,研究人员在原代T细胞中,结合含有4-1BB共刺激结构域的二代逆转录病毒CAR转导,用CRISPR/Cas9介导敲除了TCRb链。

经上述处理,研究人员得到了高功能的TCR-KO-CAR-T细胞群,这些细胞具有强烈的活化(CD25、IFN-小鼠血清)、增殖和对CD19靶点识别的特异性杀伤。TCR-KO-CAR-T细胞具有中心记忆和效应记忆T细胞的平衡表型。与表达TCR的T细胞相比,敲除T细胞内源性TCR强烈地减弱了异体反应性。在一个ALL患儿的异种移植物模型中,TCR-KO-CAR-T细胞明确地控制了CD19+白血病负担,提高了移植小细胞的体内存活率。

但内源性TCR和CAR的共表达可使T细胞获得优异的持久性,并显著延长了白血病的体内控制时间,这一点在第二个使用NALM6白血病细胞的体内模型中得到了证实。上述结果提示内源性TCR对反应寿命具有重要作用。

总而言之,用CRISPR/Cas9介导的TCR KO的抗CD19 CAR T细胞是非匹配的第三方过继T细胞移植的极具潜力的选择,在无异体反应的情况下具有很高的抗白血病功能,但有内源性TCR表达时的体内反应持久性更好。

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    2020-12-08 仁者大医
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    2020-06-09 dingxiaobo
  4. [GetPortalCommentsPageByObjectIdResponse(id=1781364, encodeId=593f1e8136470, content=<a href='/topic/show?id=8ce8405907' target=_blank style='color:#2F92EE;'>#CAR-#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=49, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4059, encryptionId=8ce8405907, topicName=CAR-)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=8e886, createdName=仁者大医, createdTime=Tue Dec 08 08:59:33 CST 2020, time=2020-12-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1682043, encodeId=06df1682043ae, content=<a href='/topic/show?id=15593040e9a' target=_blank style='color:#2F92EE;'>#内源性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=30407, encryptionId=15593040e9a, topicName=内源性)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=b46b27929604, createdName=diushouji, createdTime=Thu Jul 30 07:59:33 CST 2020, time=2020-07-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1416461, encodeId=089314164614e, content=<a href='/topic/show?id=924442e98f' target=_blank style='color:#2F92EE;'>#CD19#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4279, encryptionId=924442e98f, topicName=CD19)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f1583186918, createdName=dingxiaobo, createdTime=Tue Jun 09 11:59:33 CST 2020, time=2020-06-09, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1518949, encodeId=ab4d151894999, content=<a href='/topic/show?id=c8bb1e20902' target=_blank style='color:#2F92EE;'>#TCR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=49, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17209, encryptionId=c8bb1e20902, topicName=TCR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=a6b511213226, createdName=Boyinsh, createdTime=Tue Jun 09 11:59:33 CST 2020, time=2020-06-09, status=1, ipAttribution=)]
    2020-06-09 Boyinsh

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