Article: article from journal or magazin.
Striatal and nigral pathology in a lentiviral rat model of Machado-Joseph disease.
Human Molecular Genetics
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
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.
Aged, Animals, Behavior, Animal, Cell Line, Disease Models, Animal, Female, Gene Expression, Gene Therapy, Genetic Vectors/genetics, Humans, Lentivirus/genetics, Lentivirus/metabolism, Machado-Joseph Disease/metabolism, Machado-Joseph Disease/pathology, Male, Mice, Mice, Transgenic, Middle Aged, Nerve Tissue Proteins/genetics, Nerve Tissue Proteins/metabolism, Nuclear Proteins/genetics, Nuclear Proteins/metabolism, Rats, Rats, Wistar, Repressor Proteins/genetics, Repressor Proteins/metabolism, Substantia Nigra/metabolism, Substantia Nigra/pathology, Tyrosine 3-Monooxygenase/metabolism, Vesicular Monoamine Transport Proteins/metabolism, Visual Cortex/metabolism, Visual Cortex/pathology
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