干扰素调节因子4在多发性骨髓瘤细胞中介导非酶性IRE1依赖
Ioanna Oikonomidi1, Vasumathi Kameswaran2, Victoria C Pham2
1Department of Research Oncology, Genentech, Inc., South San Francisco, California, United States of America.
PLoS biology
|April 11, 2025
概括
多发性骨髓瘤细胞利用需要异醇的酶1 (IRE1) 进行生长. 研究人员发现,干扰素调节因子4 (IRF4) 中介IRE1对多发性髓瘤细胞循环进展的非酶效应.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 多发性骨髓瘤 (MM) 是血细胞的癌症.
- 毫米经常依赖于内分泌网膜 (ER) 应激通路,特别是需要内醇酶1 (IRE1) 的应激通路,以生存.
- IRE1在MM中的非酶作用尚不清楚.
研究的目的:
- 阐明IRE1促进MM细胞增殖的非酶性机制.
- 确定参与MM中IRE1非正规功能的关键分子参与者.
主要方法:
- 研究了干扰素调节因子4 (IRF4) 在IRE1依赖的MM生长中的作用.
- 使用了IRE1沉默,IRF4敲击,以及缺/模仿IRF4突变体.
- 分析了IRF4酸化,染色质结合,转录活性和与细胞循环基因 (E2F1,CDC25A) 和CDK2.2的接触.
主要成果:
- IRE1沉默导致IRF4抑制酸化的增加 (在S114/S270),损害了其功能.
- IRF4的淘汰模仿了IRE1沉默的反扩散效应,而IRF4的复制反转了它们.
- 缺乏的IRF4突变物在IRE1沉默下挽救了繁殖,与模仿突变物不同.
- 证明IRF4可以调节E2F1和CDC25A,促进CDK2激活和细胞周期进展.
结论:
- 干扰素调节因子4 (IRF4) 是IRE1对多发性髓瘤细胞循环进展的非酶控制的关键调解者.
- IRE1通过酸化影响IRF4活动,影响其推动MM细胞增殖的作用.
- 这些发现为MM病变发生过程中的IRE1和IRF4功能提供了新的机制性见解.
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