通过不适应的综合应激反应来总结和逆转人类大脑核糖体病变缺陷
Wei Zhang1, Minjie Zhang2, Li Ma1
1Center for Craniofacial Molecular Biology, University of Southern California, Los Angeles, CA 90033, USA.
Science advances
|February 2, 2024
概括
研究人员开发了新的小鼠和器官模型,用于由SNORD118突变引起的大脑核糖体病变. 这些模型揭示了综合应激反应 (ISR) 作为治疗点,药物2BAct在逆转疾病缺陷方面显示出希望.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 目前存在的大脑核糖体病变的模型不足以用于治疗开发.
- 核糖体病,特别是影响大脑的,需要更好的模型来理解疾病机制和测试干预措施.
研究的目的:
- 创建和描述新型遗传小鼠和人类大脑机器体模型的大脑核糖体病变.
- 调查潜在的分子机制,包括综合应激反应 (ISR) 的作用.
- 识别和验证针对已识别的疾病机制的潜在治疗策略.
主要方法:
- 基因小鼠和人类大脑器官模型的生成,其中小核核RNA (snoRNA) 的突变 SNORD118.8.
- 评估细胞表型,包括蛋白质合成,蛋白质毒性压力,p53激活,神经前体细胞 (NPC) 增殖和死亡.
- 利用基于人体诱导多能干细胞 (iPSC) 的屏幕来识别集成应激反应 (ISR) 的小分子抑制剂.
- 在已开发的疾病模型中对已识别的ISR抑制剂 (2BAct) 进行体内和体外测试.
主要成果:
- SNORD118突变模型重述了人类大脑核糖体病的关键特征,包括大脑生长迟缓.
- 观察到的缺陷包括蛋白质合成损失,蛋白质毒性压力,p53激活和NPC行为改变.
- 异常上调的酸化eIF2α (p-eIF2α),ISR的调解者,被确定为一个关键的机制.
- 小分子2BAct,一种ISR抑制剂,在体外有效逆转突变NPC缺陷,并在有机体和小鼠模型中减轻疾病表型.
结论:
- 生成的SNORD118突变器官和小鼠模型准确地重复了人类大脑中的核糖体病变.
- 综合应激反应 (ISR) 的不适应激活是这些模型中的关键疾病驱动机制.
- 用像2BAct这样的小分子准ISR代表了治疗大脑核糖体病变的有希望的治疗干预策略.
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