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Quantitative proteomic profiling of the rat substantia nigra places glial fibrillary acidic protein at the hub of proteins dysregulated during aging : implications for idiopathic Parkinson’s disease

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Date
09/04/2020
Author
Gómez-Gálvez, Yolanda
Fuller, Heidi R.
Synowsky, Silvia
Shirran, Sally L.
Gates, Monte A.
Keywords
Aging
Dopaminergic neuron
Glial fibrillary acidic protein
Proteome
Proteomics
RRID:AB_11145309
RRID:AB_2109791
RRID:AB_228307
RRID:AB_228341
RRID:AB_2336820
RRID:AB_2631098
RRID:AB_390204
RRID:MGI:5651135
RRID:SCR_001881
RRID:SCR_002798
RRID:SCR_003070
RRID:SCR_004946
RRID:SCR_005223
Substantia nigra
RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
DAS
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Abstract
There is a strong correlation between aging and onset of idiopathic Parkinson's disease, but little is known about whether cellular changes occur during normal aging that may explain this association. Here, proteomic and bioinformatic analysis was conducted on the substantia nigra (SN) of rats at four stages of life to identify and quantify protein changes throughout aging. This analysis revealed that proteins associated with cell adhesion, protein aggregation and oxidation‐reduction are dysregulated as early as middle age in rats. Glial fibrillary acidic protein (GFAP) was identified as a network hub connecting the greatest number of proteins altered during aging. Furthermore, the isoform of GFAP expressed in the SN varied throughout life. However, the expression levels of the rate‐limiting enzyme for dopamine production, tyrosine hydroxylase (TH), were maintained even in the oldest animals, despite a reduction in the number of dopamine neurons in the SN pars compact(SNc) as aging progressed. This age‐related increase in TH expression per neuron would likely to increase the vulnerability of neurons, since increased dopamine production would be an additional source of oxidative stress. This, in turn, would place a high demand on support systems from local astrocytes, which themselves show protein changes that could affect their functionality. Taken together, this study highlights key processes that are altered with age in the rat SN, each of which converges upon GFAP. These findings offer insight into the relationship between aging and increased challenges to neuronal viability, and indicate an important role for glial cells in the aging process.
Citation
Gómez-Gálvez , Y , Fuller , H R , Synowsky , S , Shirran , S L & Gates , M A 2020 , ' Quantitative proteomic profiling of the rat substantia nigra places glial fibrillary acidic protein at the hub of proteins dysregulated during aging : implications for idiopathic Parkinson’s disease ' , Journal of Neuroscience Research , vol. Early view . https://doi.org/10.1002/jnr.24622
Publication
Journal of Neuroscience Research
Status
Peer reviewed
DOI
https://doi.org/10.1002/jnr.24622
ISSN
0360-4012
Type
Journal article
Rights
Copyright © 2020 The Authors. Journal of Neuroscience Research published by Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Description
This work was made possible by generous funding from the Keele University ACORN scheme and Keele University School of Medicine.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/19776

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