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Striatal and nigral pathology in a lentiviral rat model of Machado-Joseph disease.
- Source :
-
Human molecular genetics [Hum Mol Genet] 2008 Jul 15; Vol. 17 (14), pp. 2071-83. Date of Electronic Publication: 2008 Apr 01. - Publication Year :
- 2008
-
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.
- Subjects :
- Aged
Animals
Ataxin-3
Behavior, Animal
Cell Line
Disease Models, Animal
Female
Gene Expression
Genetic Therapy
Genetic Vectors genetics
Humans
Lentivirus metabolism
Machado-Joseph Disease metabolism
Machado-Joseph Disease pathology
Male
Mice
Mice, Transgenic
Middle Aged
Nerve Tissue Proteins genetics
Nerve Tissue Proteins pharmacology
Nerve Tissue Proteins therapeutic use
Nuclear Proteins genetics
Nuclear Proteins pharmacology
Nuclear Proteins therapeutic use
Rats
Rats, Wistar
Repressor Proteins genetics
Repressor Proteins pharmacology
Repressor Proteins therapeutic use
Substantia Nigra metabolism
Substantia Nigra pathology
Tyrosine 3-Monooxygenase metabolism
Vesicular Monoamine Transport Proteins metabolism
Visual Cortex metabolism
Visual Cortex pathology
Lentivirus genetics
Machado-Joseph Disease physiopathology
Machado-Joseph Disease therapy
Nerve Tissue Proteins metabolism
Nuclear Proteins metabolism
Repressor Proteins metabolism
Substantia Nigra physiopathology
Visual Cortex physiopathology
Subjects
Details
- Language :
- English
- ISSN :
- 1460-2083
- Volume :
- 17
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- Human molecular genetics
- Publication Type :
- Academic Journal
- Accession number :
- 18385100
- Full Text :
- https://doi.org/10.1093/hmg/ddn106