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通过过度激活IRE1α来抑制瘤生长
Ruoxi Shi1,2, Ming Wang1,2, Si Chen1,2
1State Key Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, P.R. China.
iScience
|August 12, 2025
概括
离子激活癌细胞中的关键途径IRE1α,促进细胞死亡并抑制瘤生长. 这一发现为癌症治疗提供了新的治疗策略,通过激活IRE1α.
科学领域:
- 细胞生物学 细胞生物学
- 癌症研究 癌症研究
- 生物化学 生化学
背景情况:
- 展开的蛋白质响应 (UPR) 途径,特别是涉及IRE1α (需要氨基酸酶1α) 和XBP1 (X-box结合蛋白1) 的途径,对于细胞适应内质网膜应激至关重要.
- 瘤细胞利用这种途径在恶劣的瘤微环境中生存,推动癌症的进展.
- 目前的IRE1α抑制剂在癌症临床前试验中表现有前途,但缺乏临床应用.
研究的目的:
- 研究激活IRE1α作为一种瘤抑制策略的潜力,与典型的抑制方法形成鲜明对比.
- 确定用于癌症治疗的IRE1α通路的新型激活剂.
主要方法:
- 识别离子 (Mn2+) 作为IRE1α的直接激活剂.
- 描述Mn2+与IRE1α的细胞组域相互作用的特征.
- 评估Mn2+对下游亲亡和亲生存信号通路的影响.
- 在异种移植小鼠模型中限制瘤生长的Mn2+疗效的评估,评估IRE1α依赖性.
主要成果:
- 双价离子 (Mn2+) 被确定为IRE1α的强有力的激活剂.
- Mn2+ 直接与 IRE1α 的细胞溶解部分结合,增强其亲细胞亡信号传递.
- 在UPR的亲生存信号臂没有增加Mn2+.
- 在异种移植模型中,瘤生长受到IRE1α依赖的显著限制.
结论:
- 使用像Mn2+这样的药物来药理上激活IRE1α,代表了癌症治疗的有前途且可能被低估的治疗途径.
- 通过激活而不是抑制准IRE1α提供了一种新的策略,可以诱导癌细胞死亡并抑制瘤的进展.
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