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• W2109373229 abstract "Oculopharyngeal muscular dystrophy (OPMD) is a late-onset autosomal dominant muscular dystrophy that results from small expansions of a polyalanine tract in the PABPN1 gene. Intranuclear inclusions are the pathological hallmark of OPMD. The mechanism by which protein aggregation in OPMD might relate to a toxic gain-of-function has so far remained elusive. Whether protein aggregates themselves are pathogenic or are the consequence of an unidentified underlying molecular mechanism is still unclear. Here, we report that protein aggregation in a cell model of OPMD directly impaires the function of the ubiquitin–proteasome pathway (UPP) as well as molecular chaperone functions. The proteasome inhibitor lactacystin causes significant increase of protein aggregation and toxicity. Moreover, overexpression of molecular chaperones (HSP40 and HSP70) suppressed protein aggregation and toxicity. We also provide evidence that mPABPN1–ala17 protein aggregation proportionally correlates with toxicity. Furthermore, we show that co-expression of chaperones in our OPMD cell model increases the solubility of mPABPN1-ala17 and transfected cell survival rate. Our studies suggest that molecular regulators of polyalanine protein solubility and degradation may provide insights into new mechanisms in OPMD pathogenesis. Further analysis of the cellular and molecular mechanisms by which UPP and molecular chaperones influence the degradation of misfolded proteins could provide novel concepts and targets for the treatment and understanding of the pathogenesis of OPMD and neurodegenerative diseases." @default.
• W2109373229 created "2016-06-24" @default.
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• W2109373229 date "2003-08-12" @default.
• W2109373229 modified "2023-10-02" @default.
• W2109373229 title "Involvement of the ubiquitin-proteasome pathway and molecular chaperones in oculopharyngeal muscular dystrophy" @default.
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• W2109373229 doi "https://doi.org/10.1093/hmg/ddg293" @default.
• W2109373229 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12944420" @default.
• W2109373229 hasPublicationYear "2003" @default.
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