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FUS immunogold labelling TEM analysis of the neuronal cytoplasmic inclusions of neuronal intermediate filament inclusion disease: a frontotemporal lobar degeneration with FUS proteinopathy

机译：Fus免疫偶极标记眼性中间长丝包涵性神经元细胞质夹杂物的TEM分析：FUS Quotepathy的额发射型叶片变性

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Fused in sarcoma (FUS)-immunoreactive neuronal and glial inclusions define a novel molecular pathology called FUS proteinopathy. FUS has been shown to be a component of inclusions of familial amyotrophic lateral sclerosis with FUS mutation and three FTLD entities, including neuronal intermediate filament inclusion disease (NIFID). The pathogenic role of FUS is unknown. In addition to FUS, many neuronal cytoplasmic inclusions (NCI) of NIFID contain aggregates of α-internexin and neurofilament proteins. Herein, we have: (1) shown that FUS becomes relatively insoluble in NIFID and there are no post-translational modifications; (2) shown there are no pathogenic abnormalities in the FUS gene in NIFID; (3) performed an immunoelectron microscopy analysis of the precise localizations of FUS in NIFID, as this has not previously been described. FUS localized to euchromatin, and strongly with paraspeckles, in nuclei, consistent with its RNA/DNA-binding functions. NCI of varying morphologies were observed. Most frequent were the ‘loosely aggregated cytoplasmic inclusions’ (LACI), 81% of which had moderate or high levels of FUS-immunoreactivity. Much rarer ‘compact cytoplasmic inclusions’ (CCI) and ‘Tangled twine ball inclusions’ (TTBI) were FUS-immunoreactive at their granular peripheries, or heavily FUS-positive throughout, respectively. Thus FUS may aggregate in the cytoplasm and then admix with neuronal intermediate filament accumulations.

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