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Ultrastructural localization of TDP-43 in filamentous neuronal inclusions in various neurodegenerative diseases

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Abstract

Using post-embedding immunogold electron microscopy, TAR DNA-binding protein of 43 kDa (TDP-43) was localized to neuronal cytoplasmic (NCI) and intranuclear (NII) inclusions, as well as unmyelinated neurites, in frontotemporal lobar degeneration with ubiquitinated inclusions (FTLD-U), amyotrophic lateral sclerosis (ALS), Alzheimer’s (AD), Pick’s disease (PiD) and Lewy body disease (LBD). The TDP-43 immunoreactive structures were morphologically heterogeneous. The most common was characterized by bundles of 10–20 nm diameter straight filaments with electron dense granular material within NCI, NII and neurites. This type of pathology was found in FTLD-U, ALS and some cases of AD. Less often, inclusions in neuritic processes of FTLD-U and some cases of AD contained 10-17 nm diameter straight filaments without granular material. A final type of TDP-43 immunoreactivity was labeling of filaments and granular material associated with tau filaments in neurofibrillary tangles of AD and Pick bodies of PiD or α-synuclein filaments in Lewy bodies of LBD. The results suggest that TDP-43 is the primary component of the granulofilamentous inclusions in FTLD-U and ALS. Similar inclusions sometimes accompany filamentous aggregates composed of other abnormal proteins in AD, PiD and LBD.

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Acknowledgments

Supported by NIH grants P50-AG25711, P50-AG16574, P50-NS40256, P01-AG17216 and P01-AG03949.

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  1. Department of Neuroscience, Mayo Clinic College of Medicine, 4500 San Pablo Road, Jacksonville, FL, 32224, USA

    Wen-Lang Lin & Dennis W. Dickson

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  1. Wen-Lang Lin
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  2. Dennis W. Dickson
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Correspondence to Dennis W. Dickson.

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Lin, WL., Dickson, D.W. Ultrastructural localization of TDP-43 in filamentous neuronal inclusions in various neurodegenerative diseases. Acta Neuropathol 116, 205–213 (2008). https://doi.org/10.1007/s00401-008-0408-9

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  • DOI: https://doi.org/10.1007/s00401-008-0408-9

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