突变的亨廷丁在轴突中的毒性作用是由其富含proline的域介导的
Scott T Brady1,2, Nichole A Mesnard-Hoaglin1, Sarah Mays1,2
1Department of Anatomy and Cell Biology, University of Illinois at Chicago, Chicago, IL 60612, USA.
Brain : a journal of neurology
|August 26, 2023
概括
亨廷顿病的毒性涉及突变型亨廷丁 (mHTT) 中的富含proline的域 (PRD),它破坏了轴突运输. 针对这种PRD为亨廷顿病的轴突病理提供了一个新的治疗策略.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 亨廷顿氏病 (HD) 是由于突变型亨廷丁 (mHTT) 中的多重胺 (polyQ) 扩张引起的.
- 对于mHTT的毒性功能的确切机制尚不清楚.
- 了解这些机制对于开发有效的HD疗法至关重要.
研究的目的:
- 阐明特定的mHTT域在轴突病理中的作用.
- 为了确定mHTT诱导的神经毒性的分子媒介.
- 探索亨廷顿病的新型治疗点.
主要方法:
- 在培养的哺乳动物神经元中进行了删除和基于抗体的实验.
- 对富含林域 (PRD) 的聚类子区域的分析.
- 在zQ175小鼠模型和死后人类的疾病组织中进行生物化学和免疫组织化学研究.
主要成果:
- 与polyQ通道相邻的PRD对于mHTT来说至关重要,它可以抑制快速的轴突运输并引起轴突病理.
- 仅PRD亚区域就在轴突运输中引起了毒性,通过c-Jun N-终端激酶 (JNKs) 进行介导.
- 异常的PRD暴露与HD模型和患者的JNK激活增加相关.
结论:
- 在mHTT中PolyQ扩张导致异常的PRD暴露和与SH3域蛋白相互作用.
- 这种相互作用激活JNKs,导致轴突运输抑制和亨廷顿病的病理.
- 针对mHTT PRD是一个有希望的治疗途径,可以减少HD的轴突损伤.
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