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Cell Death Differ:TRIM22通过加速IκBα降解激活NF-κB信号

2020-09-01 QQY MedSci原创

NF-κB信号转导通路最初被发现表征于免疫系统中,现已发现其与癌症发生发展中的许多特征相关,这些特征包括细胞增殖、血管生成和对治疗的抵抗力。与其他恶性肿瘤一致的是,在人胶质母细胞瘤(GBM

NF-κB信号转导通路最初被发现表征于免疫系统中,现已发现其与癌症发生发展中的许多特征相关,这些特征包括细胞增殖、血管生成和对治疗的抵抗力。与其他恶性肿瘤一致的是,在人胶质母细胞瘤(GBM)中同样观察到NF-κB的高组成性活性,并可以促进该疾病的间充质分化和治疗耐药性。然而目前其相关的分子机制还有待研究。

三序基(TRIM)蛋白家族,是RING型E3泛素连接酶的一个亚家族,能够通过调节NF-κB的转录活性充当包括GBM在内的多种癌症发生发展过程中的关键调节因子。在该研究中,研究人员旨在探究TRIM蛋白在GBM发生发展过程中的作用,通过使用NF-κB驱动的荧光素酶报告基因系统和公共数据库的筛选,研究人员确定了TRIM22是GBM细胞中NF-κB信号的潜在激活因子。

体外实验和原位移植瘤模型研究显示,通过Cas9-sgRNA技术敲除TRIM22会导致GBM细胞增殖减少,而过表达TRIM22则能够增强细胞增殖能力。

研究人员发现TRIM22蛋白的两个突变体:一个是蛋白关键RING-finger结构域缺失,另一个则是RING E3连接酶(C15/18A)的两个活性位点的氨基酸改变,均不能促进GBM细胞增殖过程,说明TRIM22的E3连接酶活性具有促进细胞增殖的特性。

免疫共沉淀实验显示,TRIM22能够通过结合NF-κB负调节因子IκBα诱导K48连接的泛素化途径从而加速其降解。TRIM22还能够与NF-κB上游调节因子IKKγ形成复合物,促进K63连接的泛素化途径并诱导IKKα/β和IκBα的磷酸化。当在GBM细胞系中表达非磷酸化的突变体srIκBα则会抑制TRIM22的促增殖作用。

最后,GBM样本的组织芯片分析结果显示TRIM22的表达水平升高,且TRIM22的高表达水平与进行性神经胶质瘤的临床参数相关。

总而言之,该研究结果显示,在人胶质母细胞瘤中,TRIM22能够通过翻译后修饰NF-κB信号通路中的两个关键调节因子来激活NF-κB信号。

原始出处:

Ji, J., Ding, K., Luo, T. et al. TRIM22 activates NF-κB signaling in glioblastoma by accelerating the degradation of IκBα. Cell Death Differ (19 August 2020).

 

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    2020-12-28 isabellayj
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    2020-09-26 爆笑小医
  3. [GetPortalCommentsPageByObjectIdResponse(id=1784220, encodeId=ec311e8422080, content=<a href='/topic/show?id=f01159527d' target=_blank style='color:#2F92EE;'>#Differ#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=52, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5952, encryptionId=f01159527d, topicName=Differ)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=d784426, createdName=isabellayj, createdTime=Mon Dec 28 16:36:26 CST 2020, time=2020-12-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1962242, encodeId=590f196224227, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=395f25, createdName=爆笑小医, createdTime=Sat Sep 26 10:36:26 CST 2020, time=2020-09-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=892563, encodeId=1947892563d7, content=👍, 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/20201002/21504fa67751486f8b362fadffbc2c91/c092c62a4c4e43aca6edd018dacc3733.jpg, createdBy=6e855412268, createdName=., createdTime=Fri Oct 16 23:15:00 CST 2020, time=2020-10-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1871943, encodeId=1e0f18e194302, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Tue Jun 29 06:36:26 CST 2021, time=2021-06-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=884093, encodeId=1d4f884093ce, content=学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=114, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png;jsessionid=23017AF9A43E478B081BD06235BF844F, createdBy=e98c5416040, createdName=ms3000001121456932, createdTime=Thu Sep 10 08:03:17 CST 2020, time=2020-09-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1531654, encodeId=67bb153165489, content=<a href='/topic/show?id=770e5e9457' target=_blank style='color:#2F92EE;'>#Death#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5794, encryptionId=770e5e9457, topicName=Death)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=32e312278742, createdName=cy0328, createdTime=Thu Sep 03 13:36:26 CST 2020, time=2020-09-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=881999, encodeId=f36f88199941, content=学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=119, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=64245268311, createdName=14818eb4m67暂无昵称, createdTime=Wed Sep 02 08:04:41 CST 2020, time=2020-09-02, status=1, ipAttribution=)]
    2020-10-16 .

    👍

    0

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    2020-09-10 ms3000001121456932

    学习

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    2020-09-03 cy0328
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    2020-09-02 14818eb4m67暂无昵称

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