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Pathogenesis of Inclusion Body Myositis: Autoimmune or Degenerative Disease? Akinori Uruha 1,2 , Ichizo Nishino 1,2 1Department of Clinical Development, Translational Medical Center, National Center of Neurology and Psychiatry (NCNP) 2Department of Neuromuscular Research, National Institute of Neuroscience, NCNP Keyword: CD8-positive T cell , interleukin-1β , protein aggregates , aging pp.1291-1298
Published Date 2013/11/1
DOI https://doi.org/10.11477/mf.1416101640
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Abstract

 While the pathogenesis of inclusion body myositis (IBM) remains undetermined, there are two major hypotheses: the autoimmune hypothesis and the degeneration hypothesis. Herein, we review these hypotheses as well as potential therapeutic approaches. Evidence in favor of a primary autoimmune etiology includes the frequent complication of other autoimmune diseases in patients with IBM and the presence of autoantibodies against cytosolic 5'-nucleotidase 1A. Interleukin (IL)-1β reportedly leads to accumulation of amyloid β via nitric oxide stress in vitro. The degeneration hypothesis addresses the following aspects of IBM: accumulation of amyloid β and other abnormal proteins that are observed in neurodegenerative diseases such as Alzheimer's disease and Parkinson's disease; relation to aging; and poor response to immunotherapy. Overexpression of IL-1β in skeletal muscles of patients with IBM and its secretion from skeletal muscle cells suggests an important role for IL-1β in the pathogenesis of IBM. Thus, IL-1β is a potential treatment target.


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電子版ISSN 1344-8129 印刷版ISSN 1881-6096 医学書院

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