title: Phosphorylated and ubiquitinated TDP-43 pathological inclusions in ALS and FTLD-U are recapitulated in SH-SY5Y cells.
abstract: We report phosphorylated and ubiquitinated aggregates of TAR DNA binding protein of 43 kDa (TDP-43) in SH-SY5Y cells similar to those in brains of amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration with ubiquitinated inclusions (FTLD-U). Two candidate sequences for the nuclear localization signal were examined. Deletion of residues 78-84 resulted in cytoplasmic localization of TDP-43, whereas the mutant lacking residues 187-192 localized in nuclei, forming unique dot-like structures. Proteasome inhibition caused these to assemble into phosphorylated and ubiquitinated TDP-43 aggregates. The deletion mutants lacked the exon skipping activity of cystic fibrosis transmembrane conductance regulator (CFTR) exon 9. Our results suggest that intracellular localization of TDP-43 and proteasomal function may be involved in inclusion formation and neurodegeneration in TDP-43 proteinopathies.
authors.affiliation: Department of Molecular Neurobiology, Tokyo Institute of Psychiatry, Tokyo Metropolitan Organization for Medical Research, 2-1-8 Kamikitazawa, Setagaya-ku 156-8585, Tokyo, Japan. nonakat@prit.go.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Nonaka
authors.forename: Tetsuaki
authors.initials: T
authors.lastname: Arai
authors.forename: Emanuele
authors.initials: E
authors.lastname: Buratti
authors.forename: Francisco E
authors.initials: FE
authors.lastname: Baralle
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Akiyama
authors.forename: Masato
authors.initials: M
authors.lastname: Hasegawa
mesh_terms: D000690:Amyotrophic Lateral Sclerosis / Q000378:metabolism* / Q000473:pathology; D001921:Brain / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D003704:Dementia / Q000378:metabolism* / Q000473:pathology; D005091:Exons / Q000235:genetics; D006801:Humans; D002479:Inclusion Bodies / Q000378:metabolism* / Q000473:pathology; D010766:Phosphorylation; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D017384:Sequence Deletion; D054875:Ubiquitination
chemical_list: D004268:DNA-Binding Proteins; D046988:Proteasome Endopeptidase Complex