通过PTPσ介导的PI3P调节调节了C9ORF72-ALS/FTD中神经退行
Zhe Zhang1, Xiujuan Fu1, Noelle Wright2
1Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Brain Science Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Neuron
|March 12, 2025
概括
针对受体类型的氨酸蛋白酸酶S (PTPσ) 为C9ORF72相关的肌缩侧硬化症 (ALS) 和前性痴呆症 (FTD) 提供了一个有前途的治疗策略. 减少PTPσ通过恢复内分泌体功能来挽救神经退行.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- C9ORF72重复扩张是肌缩侧面硬化症 (ALS) 和前性痴呆症 (FTD) 的主要遗传原因.
- 从这些扩张中翻译出富含氨酸的二聚重复 (DPR) 蛋白,驱动神经退行.
- 内分泌体路径功能障碍与C9ORF72相关的神经退行性疾病有关.
研究的目的:
- 为了确定人类神经元中聚GR毒性的遗传修饰剂.
- 为了研究受体类型的氨酸蛋白酸酶S (PTPσ) 在C9ORF72-ALS/FTD病变发生过程中的作用.
- 评估PTPσ抑制作为一种治疗策略.
主要方法:
- 在人类神经元中选CRISPR干扰 (CRISPRi).
- 评估神经元存活率和内酶体功能 (酸丁酸3-酸盐水平,早期内细胞,内酶体).
- 在细胞和小鼠模型中药理上抑制PTPσ.
主要成果:
- 确定了PTPσ作为聚GR毒性的关键修饰剂.
- 降低PTPσ高酸-3酸盐 (PI3P) 水平,恢复内分泌体功能,促进神经元的存活.
- 抑制PTPσ在患者衍生的神经元中挽救了细胞表型,并在小鼠模型中改善了结果.
结论:
- 在C9ORF72-ALS/FTD中,PI3P介导的内分泌体缺陷至关重要.
- 针对PTPσ代表了C9ORF72-ALS/FTD的可行的治疗方法.
- 在临床前模型中,PTPσ抑制显示出有效性,需要进一步研究.
相关概念视频
Allosteric Proteins-ATCase
5.6K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.6K
PI3K/mTOR/AKT Signaling Pathway
3.4K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.4K
Nonsense-mediated mRNA Decay
10.4K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.4K
Regulation of the Unfolded Protein Response
2.4K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.4K


