一个K27连接的Ubiquitin检查点控制 NOTCH 恒常状态
bioRxiv : the preprint server for biology
|December 25, 2025
概括
与自相关的蛋白质UVRAG通过招募E3酶ITCH来负面调节NOTCH1信号,促进受体降解. 恢复UVRAG可以抑制NOTCH1驱动的癌症.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 癌症生物学 癌症生物学
背景情况:
- NOTCH1信号传递对发育至关重要,但需要严格监管以防止病态激活.
- 防止NOTCH1过度激活的机制在很大程度上是未知的.
- 失调的NOTCH1信号驱动各种癌症,包括T细胞白血病.
研究的目的:
- 确定NOTCH1信号传递的新型调节剂,以防止其不受控制的激活.
- 阐明NOTCH1活动受到限制的分子机制.
- 探索针对癌症NOTCH1调节的治疗潜力.
主要方法:
- 通过细胞测试确定UVRAG作为NOTCH1的负调节剂.
- 研究了UVRAG,ITCH和NOTCH1.1之间的相互作用.
- 使用了无处可见度测试来检测NOTCH1.1.的K27相关的无处可见度.
- 研究了UVRAG-ITCH-ESCRT轴在T细胞白血病模型中的作用.
主要成果:
- 在NOTCH1激活时,UVRAG会招募并激活E3酶ITCH.
- ITCH催化了与膜结合的NOTCH1的K27结合的泛化,将其定位为依赖ESCRT的溶酶体降解.
- 破坏UVRAG-ITCH-ESCRT通路导致NOTCH1中间体的稳定,并放大了瘤信号.
- 在T细胞白血病模型中恢复UVRAG降低了NOTCH1活性,抑制了疾病进展,并增强了治疗反应.
结论:
- UVRAG作为NOTCH1信号传递的关键负调节者,通过依赖于ubiquitin的降解途径进行信号传递.
- UVRAG-ITCH-ESCRT轴代表了一个维护电路,用于维护NOTCH1信号恒温.
- 针对这一轴为NOTCH1驱动的癌症提供了潜在的治疗策略.
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