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帕金森病患者来源细胞模型中的生物能量学与自噬失衡支持神经退行性变中的全身功能障碍

Bioenergetics and Autophagic Imbalance in Patients-Derived Cell Models of Parkinson Disease Supports Systemic Dysfunction in Neurodegeneration.

作者信息

González-Casacuberta Ingrid, Juárez-Flores Diana Luz, Morén Constanza, Garrabou Gloria

机构信息

Muscle Research and Mitochondrial Function Laboratory, Cellex-IDIBAPS, Faculty of Medicine and Health Sciences-University of Barcelona, Internal Medicine Service-Hospital Clínic of Barcelona, Barcelona, Spain.

CIBERER-U722, Madrid, Spain.

出版信息

Front Neurosci. 2019 Sep 10;13:894. doi: 10.3389/fnins.2019.00894. eCollection 2019.

Abstract

Parkinson's disease (PD) is the second most prevalent neurodegenerative disorder worldwide affecting 2-3% of the population over 65 years. This prevalence is expected to rise as life expectancy increases and diagnostic and therapeutic protocols improve. PD encompasses a multitude of clinical, genetic, and molecular forms of the disease. Even though the mechanistic of the events leading to neurodegeneration remain largely unknown, some molecular hallmarks have been repeatedly reported in most patients and models of the disease. Neuroinflammation, protein misfolding, disrupted endoplasmic reticulum-mitochondria crosstalk, mitochondrial dysfunction and consequent bioenergetic failure, oxidative stress and autophagy deregulation, are amongst the most commonly described. Supporting these findings, numerous familial forms of PD are caused by mutations in genes that are crucial for mitochondrial and autophagy proper functioning. For instance, late and early onset PD associated to mutations in Leucine-rich repeat kinase 2 () and Parkin () genes, responsible for the most frequent dominant and recessive inherited forms of PD, respectively, have emerged as promising examples of disease due to their established role in commanding bioenergetic and autophagic balance. Concomitantly, the development of animal and cell models to investigate the etiology of the disease, potential biomarkers and therapeutic approaches are being explored. One of the emerging approaches in this context is the use of patient's derived cells models, such as skin-derived fibroblasts that preserve the genetic background and some environmental cues of the patients. An increasing number of reports in these PD cell models postulate that deficient mitochondrial function and impaired autophagic flux may be determinant in PD accelerated nigral cell death in terms of limitation of cell energy supply and accumulation of obsolete and/or unfolded proteins or dysfunctional organelles. The reliance of neurons on mitochondrial oxidative metabolism and their post-mitotic nature, may explain their increased vulnerability to undergo degeneration upon mitochondrial challenges or autophagic insults. In this scenario, proper mitochondrial function and turnover through mitophagy, are gaining in strength as protective targets to prevent neurodegeneration, together with the use of patient-derived fibroblasts to further explore these events. These findings point out the presence of molecular damage beyond the central nervous system (CNS) and proffer patient-derived cell platforms to the clinical and scientific community, which enable the study of disease etiopathogenesis and therapeutic approaches focused on modifying the natural history of PD through, among others, the enhancement of mitochondrial function and autophagy.

摘要

帕金森病(PD)是全球第二常见的神经退行性疾病,影响着2%至3%的65岁以上人群。随着预期寿命的增加以及诊断和治疗方案的改进,这种患病率预计还会上升。PD包含多种临床、遗传和分子形式的疾病。尽管导致神经退行性变的机制在很大程度上仍不清楚,但在大多数患者和疾病模型中,一些分子特征已被反复报道。神经炎症、蛋白质错误折叠、内质网 - 线粒体串扰破坏、线粒体功能障碍及随之而来的生物能量衰竭、氧化应激和自噬失调等,是最常被描述的特征。支持这些发现的是,许多家族性PD形式是由对线粒体和自噬正常功能至关重要的基因突变引起的。例如,与富含亮氨酸重复激酶2(LRRK2)和帕金(Parkin)基因突变相关的迟发性和早发性PD,分别导致了最常见的显性和隐性遗传性PD形式,由于它们在控制生物能量和自噬平衡方面的既定作用,已成为有前景的疾病示例。与此同时,正在探索用于研究该疾病病因、潜在生物标志物和治疗方法的动物和细胞模型。在这种情况下,一种新兴方法是使用患者来源的细胞模型,如皮肤来源的成纤维细胞,其保留了患者的遗传背景和一些环境线索。在这些PD细胞模型中,越来越多的报告推测,线粒体功能缺陷和自噬通量受损可能在PD加速黑质细胞死亡中起决定性作用,这体现在细胞能量供应受限以及陈旧和/或未折叠蛋白质或功能失调细胞器的积累方面。神经元对线粒体氧化代谢的依赖及其有丝分裂后性质,可能解释了它们在面对线粒体挑战或自噬损伤时更容易发生变性。在这种情况下,通过线粒体自噬实现适当的线粒体功能和更新,作为预防神经退行性变的保护靶点正变得越来越重要,同时使用患者来源的成纤维细胞来进一步探索这些事件。这些发现指出中枢神经系统(CNS)之外存在分子损伤,并为临床和科学界提供了患者来源的细胞平台,这使得能够研究疾病的病因发病机制以及专注于通过增强线粒体功能和自噬等方式改变PD自然病程的治疗方法。

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