Mitochondrial superoxide generation induces a parkinsonian phenotype in zebrafish and huntingtin aggregation in human cells.
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Authors
Pinho, Brígida R
Reis, Sara D
Hartley, Richard C
Murphy, Michael P
Oliveira, Jorge MA
Publication Date
2019-01Journal Title
Free Radic Biol Med
ISSN
0891-5849
Publisher
Elsevier BV
Volume
130
Pages
318-327
Language
eng
Type
Article
This Version
AM
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Pinho, B. R., Reis, S. D., Hartley, R. C., Murphy, M. P., & Oliveira, J. M. (2019). Mitochondrial superoxide generation induces a parkinsonian phenotype in zebrafish and huntingtin aggregation in human cells.. Free Radic Biol Med, 130 318-327. https://doi.org/10.1016/j.freeradbiomed.2018.10.446
Abstract
Superoxide generation by mitochondria respiratory complexes is a major source of reactive oxygen species (ROS) which are capable of initiating redox signaling and oxidative damage. Current understanding of the role of mitochondrial ROS in health and disease has been limited by the lack of experimental strategies to selectively induce mitochondrial superoxide production. The recently-developed mitochondria-targeted redox cycler MitoParaquat (MitoPQ) overcomes this limitation, and has proven effective in vitro and in Drosophila. Here we present an in vivo study of MitoPQ in the vertebrate zebrafish model in the context of Parkinson's disease (PD), and in a human cell model of Huntington's disease (HD). We show that MitoPQ is 100-fold more potent than non-targeted paraquat in both cells and in zebrafish in vivo. Treatment with MitoPQ induced a parkinsonian phenotype in zebrafish larvae, with decreased sensorimotor reflexes, spontaneous movement and brain tyrosine hydroxylase (TH) levels, without detectable effects on heart rate or atrioventricular coordination. Motor phenotypes and TH levels were partly rescued with antioxidant or monoaminergic potentiation strategies. In a HD cell model, MitoPQ promoted mutant huntingtin aggregation without increasing cell death, contrasting with the complex I inhibitor rotenone that increased death in cells expressing either wild-type or mutant huntingtin. These results show that MitoPQ is a valuable tool for cellular and in vivo studies of the role of mitochondrial superoxide generation in redox biology, and as a trigger or co-stressor to model metabolic and neurodegenerative disease phenotypes.
Keywords
Brain, Mitochondria, Animals, Zebrafish, Humans, Huntington Disease, Parkinson Disease, Superoxides, Reactive Oxygen Species, Paraquat, Rotenone, Tyrosine 3-Monooxygenase, Antioxidants, Oxidation-Reduction, Oxidative Stress, Phenotype, Protein Aggregation, Pathological, Huntingtin Protein
Sponsorship
Medical Research Council (MC_UU_00015/3)
Wellcome Trust (110159/Z/15/Z)
Medical Research Council (MC_U105663142)
Identifiers
External DOI: https://doi.org/10.1016/j.freeradbiomed.2018.10.446
This record's URL: https://www.repository.cam.ac.uk/handle/1810/287280
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: http://creativecommons.org/licenses/by-nc-nd/4.0/
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