Abstract
Following initial diagnosis of Parkinson’s disease, if it were possible to prescribe a treatment that could halt or prevent further neurodegeneration, disease progression could be prevented. The aim of this study was to generate a quick and reliable assay for assessing putative neuroprotective agents for parkinsonian patients. Abnormalities in mitochondria, proteasome and lysosome function, as well as oxidative stress cause cell death in Parkinson’s disease. Thus, we exposed neuroblastoma (SH-SY5Y) cells to EC50 of toxins that mimic these cell death mechanisms (dopamine to induce oxidative stress; naphthazarin to inhibit lysosome function; proteasome inhibitor N-carbobenzyloxy-Ile-Glu(O-t-butyl)-Ala-leucinal (PSI) to inhibit the UPS (ubiquitin proteasome system) and rotenone to inhibit mitochondria function) in the presence of five compounds previously chosen as neuroprotective agents, and assessed cell viability. Coenzyme Q10 (117 μM) significantly protected against four toxins, dopamine: 16.3 ± 3.3%; naphthazarin: 10.8 ± 1.1%; PSI: 16.2 ± 2.9%; rotenone: 53.2 ± 4.2%; whereas caffeine (140 μM), creatine (25 mM), nicotine (1 μM) and deprenyl (10 μM) provided protection against some, but not all toxins. Interestingly, coenzyme Q10 is the only compound out of the five that showed neuroprotective potential in clinical trials. Thus, there is a direct correlation between the success of disease modifying agents in the clinic and their ability to protect against multiple cell death mechanisms in this assay. We propose that exposure of SH-SY5Y cells to different toxins that recapitulate cell death mechanisms in Parkinson’s disease serves as a rapid and reliable method to test neuroprotective agents that may succeed in clinical trials.
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Abbreviations
- ATP:
-
Adenosine-5′-triphosphate
- MOAB :
-
Monoamine oxidase B
- CINAPS:
-
Committee to identify neuroprotective agents in Parkinson’s.
- DMSO:
-
Dimethyl sulfoxide
- l-DOPA:
-
l-3,4-Dihydroxyphenylalanine
- NINDS:
-
National Institute of Neurologic Disorders and Stroke
- MPTP:
-
1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
- NAP:
-
5,8-Dihydroxy-1,4-naphthoquinone
- PSI:
-
N-arbobenzyloxy-Ile-Glu(O-t-butyl)-Ala-leucinal
- ROT:
-
Rotenone
- SH-SY5Y:
-
Catecholaminergic neuroblastoma cells
- UPS:
-
Ubiquitin proteasome system
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We would like to thank the Natural Sciences and Engineering Research Council of Canada, the University of Toronto Connaught Foundation and the Canadian Foundation for Innovation for funding these studies.
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Yong-Kee, C.J., Salomonczyk, D. & Nash, J.E. Development and Validation of a Screening Assay for the Evaluation of Putative Neuroprotective Agents in the Treatment of Parkinson’s Disease. Neurotox Res 19, 519–526 (2011). https://doi.org/10.1007/s12640-010-9174-2
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DOI: https://doi.org/10.1007/s12640-010-9174-2