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Neurodegenerative Disorders and TDP-43 Takashi Nonaka 1 , Yuki Inukai 1 , Tetsuaki Arai 2 , Tetsuaki Arai 1 1Department of Molecular Neurobiology,Tokyo Institute of Psychiatry 2Department of Psychogeriatrics,Tokyo Institute of Psychiatry Keyword: TDP-43 , FTLD , ALS , intracellular aggregates pp.161-166
Published Date 2009/2/1
DOI https://doi.org/10.11477/mf.1416100429
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Abstract

 In most neurodegenerative disorders,distinctive intracellular inclusion bodies are found in degenerative neurons,which are known to be neuropathological hallmarks of diseases. Recently,TAR DNA-binding protein of 43 KDa (TDP-43) has been identified as a major constituent protein of ubiquitin-positive inclusions in brains with frontotemporal lobar degeneration (FTLD) and amyotrophic lateral sclerosis (ALS). These disorders are now referred to as TDP-43 proteinopathy. TDP-43 deposited in brains with FTLD and ALS was found to be phosphorylated and ubiquitinated. To study the role of these post-translational modifications in the formation of TDP-43 aggregates,we have produced polyclonal and monoclonal antibodies specific for TDP-43 phosphorylated at Ser409 and Ser 410. These antibodies specifically recognized abnormally phosphorylated TDP-43,but not normal TDP-43 in immunohistochemical analyses of brains of FTLD and ALS patients. Immunoblot analyses using these antibodies showed that phosphorylated and fragmented TDP-43 was deposited in diseased brains. Furthermore,we identified casein kinase 1 as a candidate protein kinase,which was responsible for abnormal phosphorylation of TDP-43. Phosphorylated recombinant TDP-43 proteins were demonstrated to be easier to fibrillate than wild-type TDP-43 in vitro. Recent discoveries of the missense mutations in the TDP-43 gene in familial or sporadic ALS cases prove a direct link between altered TDP-43 function and neurodegeneration. Elucidating the biochemical processes responsible for phosphorylation,fragmentation,and intracellular aggregation of TDP-43 may provide important insights into the pathogenesis of TDP-43 proteinopathy.


Copyright © 2009, Igaku-Shoin Ltd. All rights reserved.

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

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