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Neuroprotective Upregulation of Endogenous Alpha-Synuclein Precedes Ubiquitination in Cultured Dopaminergic Neurons

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Abstract

Alpha-synuclein is the major protein component of Lewy bodies—the pathological hallmark of Parkinson’s disease (PD) and Dementia with Lewy bodies (DLB). Its accumulation into intracellular aggregates is implicated in the process of Lewy body formation. However, its roles in both normal function, and disease, remain controversial. Using a novel model of chronic oxidative stress in cultured dopaminergic and cortical neurons, we report that endogenous alpha-synuclein is upregulated in response to low dose toxicity. This response is conserved between subpopulations of cortical and dopaminergic neurons, and confers relative resistance to apoptosis following secondary insult. Additional acute oxidative stress leads to intracellular accumulation of alpha-synuclein. These punctate deposits colocalize with ubiquitin, which is central to proteosome-mediated protein degeneration, and is the second major component of Lewy bodies. The current results imply that differential levels of alpha-synuclein expression may influence neuronal vulnerability in chronic neurodegenerative diseases. They further support a ‘two hit’ hypothesis for Lewy body formation, whereby mild stress causes a protective upregulation of alpha-synuclein. However, such increased levels of alpha-synuclein may drive its accumulation, following additional toxic insult. Finally, these results support a common mechanism for degeneration of dopaminergic and cortical neurons, affected in PD, and DLB, respectively.

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Acknowledgments

National Health and Medical Research Council (NHMRC), NHMRC Career Development Award to TD, Wicking Dementia Research and Education Centre, Motor Neuron Disease Research Institute of Australia Fellowship to AK.

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Authors and Affiliations

  1. Wicking Dementia Research and Education Centre, Menzies Research Institute, University of Tasmania, Hobart, Tasmania, 7000, Australia

    R. E. J. Musgrove, A. E. King & T. C. Dickson

  2. Menzies Research Institute, University of Tasmania, Private Bag 29, Hobart, Tasmania, 7001, Australia

    T. C. Dickson

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  1. R. E. J. Musgrove
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  2. A. E. King
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  3. T. C. Dickson
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Correspondence to T. C. Dickson.

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Musgrove, R.E.J., King, A.E. & Dickson, T.C. Neuroprotective Upregulation of Endogenous Alpha-Synuclein Precedes Ubiquitination in Cultured Dopaminergic Neurons. Neurotox Res 19, 592–602 (2011). https://doi.org/10.1007/s12640-010-9207-x

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  • DOI: https://doi.org/10.1007/s12640-010-9207-x

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