DR5二硫化物结合功能作为蛋白质折叠应力传感器和效应器
Mary E Law1, Zaafir M Dulloo2, Samantha R Eggleston2
1University of Florida, Gainesville, FL, United States.
Molecular cancer research : MCR
|March 19, 2025
概括
新的研究表明,破坏DR5受体中的二硫化物键可独立于外部信号触发癌细胞死亡. 这一发现为癌症治疗提供了一种新的治疗策略,通过向内质网膜应激.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 细胞应激反应的应激反应
背景情况:
- 选择性地向癌细胞,同时保留正常组织是瘤学的关键挑战.
- TRAIL配体及其受体 (DR5,DR4) 显示出选择性癌症毒性,但针对它们的疗法尚未获得FDA批准.
- 激活DR5/DR4的小分子可以提供单一疗法或加强现有治疗方法.
研究的目的:
- 调查破坏DR5二硫化物键如何影响其表达,聚类和亡信号的研究.
- 探索内细胞网膜 (ER) 应激在调节DR5二硫化物结合和激活中的作用.
- 评估DR5二硫化物结合模式对基于抗体的疗法的影响.
主要方法:
- 使用二硫化键破坏剂 (DDAs) 抑制蛋白二硫化异构酶 (PDIs),如ERp44,AGR2和PDIA1.
- 分析了DR5表达,二硫化物结合模式和癌细胞系中的聚类.
- 研究了ER压力因子 (Thapsigargin,Tunicamycin) 和ISR抑制剂 (PERK激酶抑制剂,ISRIB) 对DR5二硫化物结合的影响.
主要成果:
- 单个DR5二硫化物键的破坏导致DR5表达的增加和二硫化物介导的集群.
- 这种干扰激活了卡斯帕酶8-卡斯帕酶3介导的亲细胞灭绝信号.
- ER应力和ISR调制改变了DR5的二硫化物结合,表明DR5作为ER应力传感器的作用.
结论:
- DR5二硫化物结合模式对其功能至关重要,可以通过ER应力调节.
- DR5作为蛋白质毒性应激的作用因子,驱动独立于细胞外连接体的外部亡.
- 了解DR5二硫化结合对开发新型癌症疗法和研究工具具有重要意义.
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