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帕金森病中微管乙酰化的动态平衡失调。

Microtubule acetylation dyshomeostasis in Parkinson's disease.

机构信息

Molecular and Cellular Neuroscience Lab, Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, Telangana, 500037, India.

School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK.

出版信息

Transl Neurodegener. 2023 May 8;12(1):20. doi: 10.1186/s40035-023-00354-0.

Abstract

The inter-neuronal communication occurring in extensively branched neuronal cells is achieved primarily through the microtubule (MT)-mediated axonal transport system. This mechanistically regulated system delivers cargos (proteins, mRNAs and organelles such as mitochondria) back and forth from the soma to the synapse. Motor proteins like kinesins and dynein mechanistically regulate polarized anterograde (from the soma to the synapse) and retrograde (from the synapse to the soma) commute of the cargos, respectively. Proficient axonal transport of such cargos is achieved by altering the microtubule stability via post-translational modifications (PTMs) of α- and β-tubulin heterodimers, core components constructing the MTs. Occurring within the lumen of MTs, K40 acetylation of α-tubulin via α-tubulin acetyl transferase and its subsequent deacetylation by HDAC6 and SIRT2 are widely scrutinized PTMs that make the MTs highly flexible, which in turn promotes their lifespan. The movement of various motor proteins, including kinesin-1 (responsible for axonal mitochondrial commute), is enhanced by this PTM, and dyshomeostasis of neuronal MT acetylation has been observed in a variety of neurodegenerative conditions, including Alzheimer's disease and Parkinson's disease (PD). PD is the second most common neurodegenerative condition and is closely associated with impaired MT dynamics and deregulated tubulin acetylation levels. Although the relationship between status of MT acetylation and progression of PD pathogenesis has become a chicken-and-egg question, our review aims to provide insights into the MT-mediated axonal commute of mitochondria and dyshomeostasis of MT acetylation in PD. The enzymatic regulators of MT acetylation along with their synthetic modulators have also been briefly explored. Moving towards a tubulin-based therapy that enhances MT acetylation could serve as a disease-modifying treatment in neurological conditions that lack it.

摘要

神经元之间的通讯发生在广泛分支的神经元细胞中,主要通过微管 (MT) 介导的轴突运输系统来实现。这个机械调节系统将货物(蛋白质、mRNA 和细胞器,如线粒体)从细胞体来回输送到突触。动力蛋白,如驱动蛋白和动力蛋白,分别机械调节货物的极化顺行(从细胞体到突触)和逆行(从突触到细胞体)运输。通过α-和β-微管蛋白异二聚体的翻译后修饰 (PTMs) 来改变微管稳定性,从而实现这种货物的有效轴突运输,α-和β-微管蛋白是构成 MT 的核心成分。发生在 MT 管腔内部的 α-微管蛋白 K40 乙酰化通过α-微管蛋白乙酰转移酶及其随后由 HDAC6 和 SIRT2 去乙酰化,是广泛研究的 PTMs,使 MT 高度灵活,从而延长其寿命。各种动力蛋白的运动,包括驱动蛋白-1(负责轴突中线粒体运输),都通过这种 PTM 得到增强,神经元 MT 乙酰化的动态平衡失调在多种神经退行性疾病中都有观察到,包括阿尔茨海默病和帕金森病 (PD)。PD 是第二常见的神经退行性疾病,与 MT 动态失衡和微管蛋白乙酰化水平失调密切相关。虽然 MT 乙酰化状态与 PD 发病机制进展之间的关系已成为一个先有鸡还是先有蛋的问题,但我们的综述旨在深入了解 MT 介导的线粒体轴突运输和 PD 中 MT 乙酰化的动态平衡失调。还简要探讨了 MT 乙酰化的酶调节因子及其合成调节剂。针对增强 MT 乙酰化的基于微管的治疗方法可能成为缺乏这种方法的神经疾病的疾病修饰治疗方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8af9/10165769/9074bb559c23/40035_2023_354_Fig1_HTML.jpg

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