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Development and characterisation of a novel rat model of Parkinson's disease induced by sequential intranigral administration of AAV-α-synuclein and the pesticide, rotenone.

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Author

  • P. Mulcahy
  • A. O'Doherty
  • A. Paucard
  • T. O'Brien
  • Deniz Kirik
  • E. Dowd

Summary, in English

Modeling Parkinson's disease remains a major challenge for preclinical researchers, as existing models fail to reliably recapitulate all of the classic features of the disease, namely, the progressive emergence of a bradykinetic motor syndrome with underlying nigrostriatal alpha-synuclein protein accumulation and nigrostriatal neurodegeneration. One limitation of the existing models is that they are normally induced by a single neuropathological insult, whereas the human disease is thought to be multifactorial with genetic and environmental factors contributing to the disease pathogenesis. Thus, in order to develop a more relevant model, we sought to determine if administration of the Parkinson's disease-associated pesticide, rotenone, into the substantia nigra of rats overexpressing the Parkinson's disease-associated protein, alpha-synuclein, could reliably model the triad of classic features of the human disease. To do so, rats underwent stereotaxic surgery for unilateral delivery of the adenoassociated virus (AAV)-alpha-synuclein into the substantia nigra. This was followed 13 weeks later by delivery of rotenone into the same site. The effect of the genetic and environmental insults alone or in combination on lateralised motor performance (Corridor, Stepping, and Whisker Tests), nigrostriatal integrity (tyrosine hydroxylase immunohistochemistry), and alpha-synucleinopathy (alpha-synuclein immunohistochemistry) was assessed. We found that rats treated with either AAV-alpha-synuclein or rotenone developed significant motor dysfunction with underlying nigrostriatal neurodegeneration. However, when the genetic and environmental insults were sequentially administered, the detrimental impact of the combined insults on motor performance and nigrostriatal integrity was significantly greater than the impact of either insult alone. This indicates that sequential exposure to relevant genetic and environmental insults is a valid approach to modeling human Parkinson's disease in the rat. 2011 IBRO. Published by Elsevier Ltd. All rights reserved.

Publishing year

2012

Language

English

Pages

170-179

Publication/Series

Neuroscience

Volume

203

Document type

Journal article

Publisher

Elsevier

Topic

  • Neurosciences

Keywords

  • Parkinson's disease
  • animal models
  • AAV-alpha-synuclein
  • rotenone
  • motor
  • function

Status

Published

Research group

  • Brain Repair and Imaging in Neural Systems (BRAINS)

ISBN/ISSN/Other

  • ISSN: 1873-7544