对2型脊髓小脑动症的抗意义寡核酸治疗
Daniel R Scoles1, Pratap Meera2, Matthew D Schneider1
1Department of Neurology, University of Utah, 175 North Medical Drive East, 5th Floor, Salt Lake City, Utah 84132, USA.
反感性寡核酸 (ASO) 是一种有前途的新疗法,用于治疗神经退行性疾病 - - 2型脊髓脑动症 (SCA2). 在小鼠模型中,ASO7治疗成功降低了ATXN2基因表达,改善了运动功能,并使蛋白质水平正常化.
科学领域:
- 神经科学
- 遗传学
- 药理学
背景情况:
- 大人的神经退行性疾病缺乏疾病修饰治疗.
- 脊髓小脑动症2型 (SCA2) 是一种自体主导的多重质胺疾病,导致神经元的进展性功能障碍和退化.
- 现有的小鼠模型表现出人类SCA2的关键特征,包括普尔金耶细胞功能障碍和运动缺陷.
研究的目的:
- 调查针对RNA的疗法,特别是反感性寡核酸 (ASO) 的有效性,用于治疗2型脊髓小脑缩症 (SCA2).
- 在SCA2的相关小鼠模型中开发和测试针对ATXN2基因的新型ASO.
主要方法:
- 选了152种反意义寡核酸 (ASO),以确定向ATXN2基因的候选物.
- 在两种SCA2小鼠模型 (ATXN2- Q127和BAC- Q72) 中通过脑内静脉注射给药.
- 评估ASO7对ATXN2mRNA和蛋白质水平,普尔金耶细胞功能,运动性能和相关蛋白质表达的影响.
主要成果:
- 在小脑中,ASO7有效降低了ATXN2mRNA和蛋白质水平,持续超过10周,没有诱导微质激活.
- 在有症状的小鼠中,ASO7治疗延迟了SCA2表型的出现,并显著改善了运动功能.
- 在Purkinje细胞中,ASO7使几个SCA2相关蛋白质的表达正常化,并恢复正常的Purkinje细胞发射频率,即使是在症状出现后启动的.
结论:
- 对于像SCA2这样的成年神经退行性疾病来说, ASO是一个有前途的治疗策略.
- 用ASO向ATXN2基因可以改变疾病的进展并恢复神经元功能.
- 这项研究提供了强有力的临床前证据,证明基于ASO的疗法在治疗多重胺相关的神经退行性疾病方面具有潜力.
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