药物开发 药物开发
Dominique Taillie1, Diana Cha1, Gina Ferraro1
1Alnylam Pharmaceuticals, Cambridge, MA, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 25, 2025
概括
用APP降低siRNA的早期干预显著减少了阿尔茨海默病的病理学,并防止了小鼠模型中的行为缺陷. 这种RNAi治疗方法在治疗阿尔茨海默病方面表现有前途.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
- 药理学 药理学是指药理学的学科.
背景情况:
- 阿尔茨海默病 (AD) 的特点是粉样β (Aβ) 聚合,源自粉样β前体蛋白 (APP).
- 向APPmRNA的RNA干扰 (RNAi) 为阿尔茨海默病提供了一个新的治疗策略.
- 5xFAD小鼠模型表现出强大的AD病理,包括粉样质斑块和神经炎症.
研究的目的:
- 在AD的5xFAD小鼠模型中使用降低APP的小干扰RNA (siRNA) 评估早期和晚期干预的疗效.
- 评估siRNA治疗对分子,生化,组织学和行为结果的影响.
主要方法:
- 针对APP的siRNA或人工脑脊液 (aCSF) 通过5xFAD小鼠在疾病早期 (12周) 和晚期 (8个月) 阶段的脑内静脉注射.
- 对于早期干预,使用了不同的剂量方案,包括暂时和持续降低APP.
- 对12个月大的小鼠进行了分子,生物化学,组织学和行为评估 (升高的加迷宫,开放场测定).
主要成果:
- 晚期干预减少了粉样蛋白负担,致病性Aβ物种 (Aβ40,Aβ42),质炎症标志物和血神经丝光链 (NfL).
- 早期干预剂量依赖性降低了粉样蛋白负担,质炎症和血NfL.
- 在早期干预中,强大的,持续的APP降低完全阻止了类似焦虑的行为,这是一个关键的疾病表型.
结论:
- 在5xFAD小鼠模型中,APP降低的siRNA有效地降低了阿尔茨海默病的病理学.
- 早期,高剂量干预可以预防行为缺陷,改善疾病表型.
- 这些发现支持开发 mivelsiran,一个研究中的APP降低RNAi治疗药物,用于AD治疗.
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