The human LRRK2-R1441G mutation drives age-dependent oxidative stress and mitochondrial dysfunction in dopaminergic neurons
- 1Department of Physiology & Pharmacology, Isakson Center for Neurological Disease Research, College of Veterinary Medicine, The University of Georgia
- 2Department of Neuroscience, Thomas Jefferson University
Abstract
Background Mitochondrial dysfunction and oxidative stress are central to the pathogenesis of Parkinson’s disease (PD), particularly affecting substantia nigra pars compacta (SNc) dopamine (DA) neurons. Here, we investigate how the R1441G mutation in leucine-rich repeat kinase 2 (LRRK2), a key genetic contributor to familial and sporadic PD, impacts mitochondrial function in midbrain DA neurons. Methods We employed a BAC transgenic mouse model overexpressing human LRRK2–R1441G (BAC-hR1441G) and crossed it with TH-mito-roGFP mice to enable mitochondria-targeted redox imaging specifically in DA neurons. Acute midbrain slices from 3-, 6-, and 12-month-old mice were imaged using two-photon microscopy to assess mitochondrial oxidative stress. In parallel, mitochondrial respiratory function, membrane potential flickering events, and expression of uncoupling proteins (UCP4/UCP5) were analyzed. Spatial transcriptomic profiling was performed using the GeoMx® Digital Spatial Profiler to uncover associated molecular alterations. Results We observed a progressive increase in mitochondrial oxidative stress in SNc DA neurons of BAC-hR1441G mice at 3, 6, and 12 months of age. This was accompanied by reduced respiratory complex activity, attenuated mitochondrial membrane potential flickering, and diminished expression of UCP4 and UCP5. Spatial transcriptomic analysis revealed dysregulation of genes linked to mitochondrial uncoupling, calcium signaling, and redox regulation in BAC-hR1441G SNc DA neurons. Conclusions These findings reveal an age-dependent progression of mitochondrial dysfunction in BAC-hR1441G SNc DA neurons. Dysregulation of calcium channels and uncoupling proteins emerges as a key mechanism contributing to bioenergetic failure, suggesting potential therapeutic targets to mitigate PD progression.
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BibTeX
@article{chen2026human,
title = {{The human LRRK2-R1441G mutation drives age-dependent oxidative stress and mitochondrial dysfunction in dopaminergic neurons}},
author = {Yuanxin Chen and Lianteng Zhi and Shiquan Cui and Huaixin Wang and Chenbo Zeng and Hui Zhang},
journal = {Molecular Neurodegeneration},
year = {2026},
month = jul,
doi = {10.1186/s13024-026-00969-7},
url = {https://doi.org/10.1186/s13024-026-00969-7},
note = {CC BY},
}
RIS
TY - JOUR
TI - The human LRRK2-R1441G mutation drives age-dependent oxidative stress and mitochondrial dysfunction in dopaminergic neurons
AU - Yuanxin Chen
AU - Lianteng Zhi
AU - Shiquan Cui
AU - Huaixin Wang
AU - Chenbo Zeng
AU - Hui Zhang
PY - 2026
DA - 2026/07/01
JO - Molecular Neurodegeneration
DO - 10.1186/s13024-026-00969-7
UR - https://doi.org/10.1186/s13024-026-00969-7
AB - Background Mitochondrial dysfunction and oxidative stress are central to the pathogenesis of Parkinson’s disease (PD), particularly affecting substantia nigra pars compacta (SNc) dopamine (DA) neurons. Here, we investigate how the R1441G mutation in leucine-rich repeat kinase 2 (LRRK2), a key genetic contributor to familial and sporadic PD, impacts mitochondrial function in midbrain DA neurons. Methods We employed a BAC transgenic mouse model overexpressing human LRRK2–R1441G (BAC-hR1441G) and crossed it with TH-mito-roGFP mice to enable mitochondria-targeted redox imaging specifically in DA neurons. Acute midbrain slices from 3-, 6-, and 12-month-old mice were imaged using two-photon microscopy to assess mitochondrial oxidative stress. In parallel, mitochondrial respiratory function, membrane potential flickering events, and expression of uncoupling proteins (UCP4/UCP5) were analyzed. Spatial transcriptomic profiling was performed using the GeoMx® Digital Spatial Profiler to uncover associated molecular alterations. Results We observed a progressive increase in mitochondrial oxidative stress in SNc DA neurons of BAC-hR1441G mice at 3, 6, and 12 months of age. This was accompanied by reduced respiratory complex activity, attenuated mitochondrial membrane potential flickering, and diminished expression of UCP4 and UCP5. Spatial transcriptomic analysis revealed dysregulation of genes linked to mitochondrial uncoupling, calcium signaling, and redox regulation in BAC-hR1441G SNc DA neurons. Conclusions These findings reveal an age-dependent progression of mitochondrial dysfunction in BAC-hR1441G SNc DA neurons. Dysregulation of calcium channels and uncoupling proteins emerges as a key mechanism contributing to bioenergetic failure, suggesting potential therapeutic targets to mitigate PD progression.
SN - 1750-1326
ER -