瘤性KEAP1突变激活TRAF2-NFκB信号传递,以防止肺癌细胞的亡
Ashik Jawahar Deen1, Simone Adinolfi1, Jouni Härkönen2
1A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, 70211, Finland.
Redox biology
|January 7, 2024
概括
在KEAP1 (Kelch-like ECH相关蛋白1) 热点R320和R470中的突变可以提高癌细胞的存活率. 这些突变通过TRAF2相互作用激活NFκB通路,促进肺腺癌中对亡的抵抗力.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 细胞应激反应的应激反应
背景情况:
- 凯尔赫类ECH相关蛋白1 (KEAP1) -核因子红色素2相关因子2 (NRF2) 途径调节细胞对氧化应激的防御.
- 构成性NRF2激活,通常是由于KEAP1功能丧失突变,在癌症,特别是非小细胞肺癌 (NSCLC) 中赋予化疗和放射电阻.
- 在肺腺癌中经常观察到特定的KEAP1突变热点,如R320和R470.
研究的目的:
- 调查KEAP1热点突变 (R320Q和R470C) 在肺腺癌中的功能意义.
- 阐明这些突变影响细胞信号通路和细胞亡的分子机制.
- 为了确定突变KEAP1.1的新型蛋白相互作用体.
主要方法:
- 基因组丰富分析 (GSEA) 的TCGA肺腺癌数据.
- 与质谱学 (AP-MS) 结合的亲和性净化,以分析KEAP1蛋白质相互作用体.
- 在A549肺腺癌细胞过度表达野生型和突变KEAP1.1的功能测定中.
主要成果:
- 在R320和R470的KEAP1突变与增强的瘤坏死因子α (TNFα) -核因子kappa亚单元B (NFκB) 信号传导,MYC和MTORC1通路相关.
- TNF受体相关因子2 (TRAF2) 被确定为突变KEAP1.1的新型相互作用伙伴.
- 突变KEAP1蛋白与TRAF2和其他抗亡蛋白的相互作用增加,导致TRAF2介导的NFκB活性增强和肺腺癌细胞的亡抵抗.
结论:
- 通过与TRAF2.2相互作用,KEAP1突变R320Q和R470C促进癌细胞存活.
- 这种相互作用激活了NFκB通路,通过像XIAP这样的蛋白质对亡产生保护.
- 针对KEAP1-TRAF2-NFκB轴可能为具有这些特定KEAP1突变的NSCLC提供治疗策略.
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