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    The ER-bound RING finger protein 5 (RNF5/RMA1) causes degenerative myopathy in transgenic mice and is deregulated in inclusion body myositis

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    Authors
    Delaunay, Agnes
    Bromberg, Kenneth D.
    Hayashi, Yukiko
    Mirabella, Massimiliano
    Burch, Denise
    Kirkwood, Brian
    Serra, Carlo
    Malicdan, May C.
    Mizisin, Andrew P.
    Morosetti, Roberta
    Broccolini, Aldobrando
    Guo, Ling T.
    Jones, Stephen N.
    Lira, Sergio A.
    Puri, Pier Lorenzo
    Shelton, G. Diane
    Ronai, Ze'ev
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    UMass Chan Affiliations
    Department of Cell Biology
    Document Type
    Journal Article
    Publication Date
    2008-02-14
    Keywords
    Animals
    DNA-Binding Proteins
    Gene Expression
    Inclusion Bodies
    Membrane Proteins
    Mice
    Mice, Transgenic
    Muscular Diseases
    *Myositis
    Phenotype
    Ubiquitin-Protein Ligases
    Cell Biology
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    Abstract
    Growing evidence supports the importance of ubiquitin ligases in the pathogenesis of muscular disorders, although underlying mechanisms remain largely elusive. Here we show that the expression of RNF5 (aka RMA1), an ER-anchored RING finger E3 ligase implicated in muscle organization and in recognition and processing of malfolded proteins, is elevated and mislocalized to cytoplasmic aggregates in biopsies from patients suffering from sporadic-Inclusion Body Myositis (sIBM). Consistent with these findings, an animal model for hereditary IBM (hIBM), but not their control littermates, revealed deregulated expression of RNF5. Further studies for the role of RNF5 in the pathogenesis of s-IBM and more generally in muscle physiology were performed using RNF5 transgenic and KO animals. Transgenic mice carrying inducible expression of RNF5, under control of beta-actin or muscle specific promoter, exhibit an early onset of muscle wasting, muscle degeneration and extensive fiber regeneration. Prolonged expression of RNF5 in the muscle also results in the formation of fibers containing congophilic material, blue-rimmed vacuoles and inclusion bodies. These phenotypes were associated with altered expression and activity of ER chaperones, characteristic of myodegenerative diseases such as s-IBM. Conversely, muscle regeneration and induction of ER stress markers were delayed in RNF5 KO mice subjected to cardiotoxin treatment. While supporting a role for RNF5 Tg mice as model for s-IBM, our study also establishes the importance of RNF5 in muscle physiology and its deregulation in ER stress associated muscular disorders.
    Source
    PLoS One. 2008 Feb 13;3(2):e1609. Link to article on publisher's site
    DOI
    10.1371/journal.pone.0001609
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/36012
    Related Resources
    Link to Article in PubMed
    ae974a485f413a2113503eed53cd6c53
    10.1371/journal.pone.0001609
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