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Title: Striatal and nigral pathology in a lentiviral rat model of Machado-Joseph disease
Authors: Alves, Sandro 
Régulier, Etienne 
Nascimento-Ferreira, Isabel 
Hassig, Raymonde 
Dufour, Noelle 
Koeppen, Arnulf 
Carvalho, Ana Luísa 
Simões, Sérgio 
Lima, Maria C. Pedroso de 
Brouillet, Emmanuel 
Gould, Veronica Colomer 
Déglon, Nicole 
Almeida, Luís Pereira de 
Issue Date: 15-Jul-2008
Publisher: Oxford University Press
Citation: Human Molecular Genetics. 17:14 (2008) 2071-2083
Abstract: Machado-Joseph disease (MJD) is a fatal, dominant neurodegenerative disorder. MJD results from polyglutamine repeat expansion in the MJD-1 gene, conferring a toxic gain of function to the ataxin-3 protein. In this study, we aimed at overexpressing ataxin-3 in the rat brain using lentiviral vectors (LV), to generate an in vivo MJD genetic model and, to study the disorder in defined brain regions: substantia nigra, an area affected in MJD, cortex and striatum, regions not previously reported to be affected in MJD. LV encoding mutant or wild-type human ataxin-3 was injected in the brain of adult rats and the animals were tested for behavioral deficits and neuropathological abnormalities. Striatal pathology was confirmed in transgenic mice and human tissue. In substantia nigra, unilateral overexpression of mutant ataxin-3 led to: apomorphine-induced turning behavior; formation of ubiquitinated ataxin-3 aggregates; alpha-synuclein immunoreactivity; and loss of dopaminergic markers (TH and VMAT2). No neuropathological changes were observed upon wild-type ataxin-3 overexpression. Mutant ataxin-3 expression in striatum and cortex, resulted in accumulation of misfolded ataxin-3, and within striatum, loss of neuronal markers. Striatal pathology was confirmed by observation in MJD transgenic mice of ataxin-3 aggregates and substantial reduction of DARPP-32 immunoreactivity and, in human striata, by ataxin-3 inclusions, immunoreactive for ubiquitin and alpha-synuclein. This study demonstrates the use of LV encoding mutant ataxin-3 to produce a model of MJD and brings evidence of striatal pathology, suggesting that this region may contribute to dystonia and chorea observed in some MJD patients and may represent a target for therapies
ISSN: 1460-2083
DOI: 10.1093/hmg/ddn106
Rights: openAccess
Appears in Collections:FFUC- Artigos em Revistas Internacionais

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