Chedid Jessica, Li Yan, Labrador-Garrido Adahir, Abu-Bonsrah Dad, Pavan Chiara, Fraser Tyra, Ovchinnikov Dmitry, Zhong Melanie, Davis Ryan, Strbenac Dario, Johnston Jennifer A, Thompson Lachlan H, Kirik Deniz, Parish Clare L, Halliday Glenda M, Sue Carolyn M, Wali Gautam, Dzamko Nicolas
The University of Sydney, Brain and Mind Centre & Faculty of Medicine and Health School of Medical Sciences, Sydney, NSW, Australia.
Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD, USA.
NPJ Parkinsons Dis. 2025 Jun 20;11(1):177. doi: 10.1038/s41531-025-01048-2.
Mutations causing Parkinson's disease (PD) give diverse pathological phenotypes whose cellular correlates remain to be determined. Those with PRKN mutations have significantly earlier selective vulnerability of dopamine neurons, those with SNCA mutations have increased alpha-synuclein deposition, while those with LRRK2 mutations have additional deposition of tau. Yet all three mutation types are implicated in mitochondrial and/or lysosomal dysfunction. To compare cellular dysfunctions associated with these different pathological phenotypes, an unbiased high-content imaging platform was developed to assess both lysosomal and mitochondrial dysfunction, along with alpha-synuclein and tau protein deposition using induced pluripotent stem cell (iPSC) derived cortical and ventral midbrain neurons. Different PD mutations caused cell type specific dysfunctions, likely to impact on both selective neuronal vulnerability and the pathologies observed in PD. Comparison of dopamine neurons identified that both lysosomal and mitochondrial dysfunction were predominant with PRKN lof mutations, whereas SNCA A53T and LRRK2 R1441G mutations had increased tau deposition. In contrast, cortical neurons with SNCA and LRRK2 mutations both had mitochondrial and autophagy impairments without protein deposition, with LRRK2 cells additionally showing decreased glucocerebrosidase activity and increased alpha-synuclein phosphorylation.
导致帕金森病(PD)的突变会产生多种病理表型,其细胞关联仍有待确定。携带PRKN突变的患者多巴胺神经元具有明显更早出现的选择性易损性,携带SNCA突变的患者α-突触核蛋白沉积增加,而携带LRRK2突变的患者则有额外的tau蛋白沉积。然而,所有这三种突变类型都与线粒体和/或溶酶体功能障碍有关。为了比较与这些不同病理表型相关的细胞功能障碍,开发了一个无偏倚的高内涵成像平台,以评估溶酶体和线粒体功能障碍,以及使用诱导多能干细胞(iPSC)衍生的皮质和腹侧中脑神经元检测α-突触核蛋白和tau蛋白沉积。不同的PD突变导致细胞类型特异性功能障碍,可能会影响选择性神经元易损性和PD中观察到的病理变化。对多巴胺神经元的比较发现,PRKN功能缺失突变时溶酶体和线粒体功能障碍均占主导,而SNCA A53T和LRRK2 R1441G突变则有tau沉积增加。相比之下,携带SNCA和LRRK2突变的皮质神经元均有线粒体和自噬功能受损,但无蛋白质沉积,LRRK2细胞还表现出葡萄糖脑苷脂酶活性降低和α-突触核蛋白磷酸化增加。