在内分泌过程中NOTCH3的细胞外域脱落与不同CADASIL突变激活机制之间的异质性有关
Samira Hosseini-Alghaderi1, Martin Baron2
1School of Biological Sciences, University of Manchester, Michael Smith Building, Oxford Rd, Manchester, M13 9PY, UK. samira.hosseini@manchester.ac.uk.
Cell communication and signaling : CCS
|August 5, 2025
概括
在CADASIL中,NOTCH3的基底内细胞因子会导致细胞外域 (ECD) 脱落,这是一种与中风和痴呆症相关的疾病. 了解这些机制可能会导致针对小血管疾病的新疗法.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 大脑自体主导动脉病变与下皮层心脏病发作和白细胞大脑病变 (CADASIL) 是由NOTCH3突变引起的,导致中风和血管痴呆.
- NOTCH3细胞外域 (ECD) 的积累对血管光滑肌细胞 (VSMC) 有毒,并且调节错误的信号有助于疾病的进展.
- 虽然联结体诱导的激活是典型的,但一些CADASIL突变者绕过了这一点,表明了其他激活途径.
研究的目的:
- 调查NOTCH3的基底内细胞分裂是否独立于连接体结合,有助于CADASIL突变体中ECD脱落.
- 阐明野生型 (WT) 和CADASIL突变NOTCH3蛋白质的内细胞贩运和信号机制.
主要方法:
- 人类细胞 (hTERT-RPE1) 与WT和突变NOTCH3结构 (R90C,C212Y,C455R) 的暂时转染.
- 脉冲追踪内细胞吸收试验以追踪NOTCH3内部化.
- 免疫定位以确定NOTCH3 ECD和细胞内域 (ICD) 的亚细胞定位.
- 路西法酶记者测定以评估NOTCH3信号活动.
主要成果:
- 无论是WT和CADASIL NOTCH3蛋白质,在ECD脱落之前都经历了内细胞分裂,ECD和ICD在内体内进行独立的贩运.
- 与WT和其他突变物相比,R90C突变物表现出较早的ECD分离.
- 所有结构都激活了下游信号,R90C显示了独特的激活要求,包括对溶酶体蛋白TRPML抑制的敏感性.
结论:
- 基底NOTCH3内细胞分裂是CADASIL中ECD脱落和积累的潜在来源.
- 不同的CADASIL突变体中的NOTCH3信号传递和ECD脱落的基础是不同的机制.
- 调节内细胞通路为小血管疾病提供了潜在的治疗策略,可能比直接信号抑制更好地耐受.
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