在LRRK2-R1441C帕金森病模型中的线粒体功能障碍和线粒体缺陷
Matthew G Williamson1,2, Marta Madureira1,2,3, William McGuinness1,2
1Oxford Parkinson's Disease Centre and Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3QU, UK.
Human molecular genetics
|June 29, 2023
概括
氨酸丰富的重复激酶2 (LRRK2) 的突变导致帕金森病 (PD). 这种LRRK2R1441C突变会损害线粒体功能和线粒体,并可能对细胞类型产生特定影响,并不能通过MLi-2治疗来纠正.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
- 细胞生物学 细胞生物学
背景情况:
- 氨酸丰富的重复激酶2 (LRRK2) 基因的突变是帕金森病 (PD) 的常见遗传原因.
- 众所周知,LRRK2突变,特别是LRRK2G2019S和LRRK2R1441C,会破坏线粒体功能.
研究的目的:
- 为了研究LRRK2R1441C突变对帕金森病神经元模型中的线粒体健康和线粒体衰变的影响.
- 为了比较LRRK2R1441C与LRRK2G2019S的影响,并评估LRRK2抑制的有效性.
主要方法:
- 利用了表达LRRK2R1441C突变的老鼠原发皮质和人类诱导的多能干细胞衍生多巴胺基因 (iPSC-DA) 神经元培养物.
- 评估了线粒体膜潜力,线粒体功能,基底和激活线粒体,线粒体形态,以及线粒体标记物 (pS65Ub) 和MIRO1.1的蛋白质水平.
- 用了LRRK2抑制剂MLi-2来评估其治疗潜力.
主要成果:
- LRRK2R1441C神经元表现出线粒体膜潜能降低,线粒体功能受损,基底线粒细胞衰减.
- 在iPSC-DA神经元中观察到线粒体形态的改变,但在皮质神经元中没有,这表明细胞类型的特异性.
- 在LRRK2R1441C神经元中,pS65Ub水平降低,在线粒体损伤时MIRO1降解受损,这表明线粒体细胞激活和蛋白质处理受损.
- 在LRRK2R1441C iPSC-DA神经元中,LRRK2抑制剂MLi-2没有恢复线粒细胞衰变或线粒体功能.
结论:
- LRRK2R1441C突变以细胞类型特定的方式损害线粒体功能和线粒细胞衰变,与LRRK2G2019S.S.不同.
- 在LRRK2R1441C神经元中,MIRO1的降解受损表明一种新的致病机制.
- 目前的LRRK2抑制策略可能无法完全解决由LRRK2R1441C突变引起的线粒体功能障碍.
相关概念视频
01:22Lysosomal Hydrolases
3.8K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.8K
01:15Parkinson's Disease: Overview
606
Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
606
01:46Electron Transport Chain: Complex I and II
14.6K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
14.6K
01:19Translocation of Proteins into the Mitochondria
3.2K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.2K