Calpastatin-mediated inhibition of calpains in the mouse brain prevents mutant ataxin 3 proteolysis, nuclear localization and aggregation, relieving Machado-Joseph disease.

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Serval ID
serval:BIB_B1949BD3902E
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Calpastatin-mediated inhibition of calpains in the mouse brain prevents mutant ataxin 3 proteolysis, nuclear localization and aggregation, relieving Machado-Joseph disease.
Journal
Brain
Author(s)
Simões A.T., Gonçalves N., Koeppen A., Déglon N., Kügler S., Duarte C.B., Pereira de Almeida L.
ISSN
1460-2156 (Electronic)
ISSN-L
0006-8950
Publication state
Published
Issued date
2012
Volume
135
Number
8
Pages
2428-2439
Language
english
Notes
Publication types: Journal ArticlePublication Status: ppublish
Abstract
Machado-Joseph disease is the most frequently found dominantly-inherited cerebellar ataxia. Over-repetition of a CAG trinucleotide in the MJD1 gene translates into a polyglutamine tract within the ataxin 3 protein, which upon proteolysis may trigger Machado-Joseph disease. We investigated the role of calpains in the generation of toxic ataxin 3 fragments and pathogenesis of Machado-Joseph disease. For this purpose, we inhibited calpain activity in mouse models of Machado-Joseph disease by overexpressing the endogenous calpain-inhibitor calpastatin. Calpain blockage reduced the size and number of mutant ataxin 3 inclusions, neuronal dysfunction and neurodegeneration. By reducing fragmentation of ataxin 3, calpastatin overexpression modified the subcellular localization of mutant ataxin 3 restraining the protein in the cytoplasm, reducing aggregation and nuclear toxicity and overcoming calpastatin depletion observed upon mutant ataxin 3 expression. Our findings are the first in vivo proof that mutant ataxin 3 proteolysis by calpains mediates its translocation to the nucleus, aggregation and toxicity and that inhibition of calpains may provide an effective therapy for Machado-Joseph disease.
Pubmed
Web of science
Open Access
Yes
Create date
10/08/2012 8:00
Last modification date
25/09/2019 7:10
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