Cited by 169Amyotrophic Lateral Sclerosis ResearchAlzheimer's disease research and treatmentsAutophagy in Disease and Therapy

Rapamycin Rescues TDP-43 Mislocalization and the Associated Low Molecular Mass Neurofilament Instability

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Caccamo, Antonella, Majumder, Smita, Deng, Janice J., Bai, Yidong, Thornton, Fiona B., Oddo, Salvatore·2009·Journal of Biological Chemistry

Abstract

TDP-43 is a nuclear protein involved in exon skipping and alternative splicing. Recently, TDP-43 has been identified as the pathological signature protein in frontotemporal lobar degeneration with ubiquitin-positive inclusions and in amyotrophic lateral sclerosis. In addition, TDP-43-positive inclusions are present in Parkinson disease, dementia with Lewy bodies, and 30% of Alzheimer disease cases. Pathological TDP-43 is redistributed from the nucleus to the cytoplasm, where it accumulates. An approximately 25-kDa C-terminal fragment of TDP-43 accumulates in affected brain regions, suggesting that it may be involved in the disease pathogenesis. Here, we show that overexpression of the 25-kDa C-terminal fragment is sufficient to cause the mislocalization and cytoplasmic accumulation of endogenous full-length TDP-43 in two different cell lines, thus recapitulating a key biochemical characteristic of TDP-43 proteinopathies. We also found that TDP-43 mislocalization is associated with a reduction in the low molecular mass neurofilament mRNA levels. Notably, we show that the autophagic system plays a role in TDP-43 metabolism. Specifically, we found that autophagy inhibition increases the accumulation of the C-terminal fragments of TDP-43, whereas inhibition of mTOR, a key protein kinase involved in autophagy regulation, reduces the 25-kDa C-terminal fragment accumulation and restores TDP-43 localization. Our results suggest that autophagy induction may be a valid therapeutic target for TDP-43 proteinopathies.

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  1. Wang, I. F., Reddy, N. M., and Shen, C. K. (2002) Proc. Natl. Acad. Sci.

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Authors
Caccamo, A., Majumder, S., Deng, J. J., Bai, Y., Thornton, F. B., & Oddo, S.
Affiliations
The University of Texas at San Antonio Health Science Center (US)
Corresponding author
Oddo, Salvatore
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-10
Volume
284
Issue
40
Pages
27416-27424
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1996815931
Cited by
169
References
57
Citations by year
2026: 9 · 2025: 9 · 2024: 3 · 2023: 9 · 2022: 7 · 2021: 10 · 2020: 10 · 2019: 5 · 2018: 10 · 2017: 5 · 2016: 10 · 2015: 7 · 2014: 16 · 2013: 13 · 2012: 14
FWCI
9.78
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Strong
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
TDP-43, TDP-43 mislocalization, autophagy, mTOR, rapamycin, TDP-43 proteinopathy, frontotemporal lobar degeneration, amyotrophic lateral sclerosis, therapeutic target
MeSH terms
Amino Acid Sequence, Animals, Autophagy, Cytoplasm, DNA-Binding Proteins, Gene Expression Regulation, Humans, Molecular Sequence Data, Molecular Weight, RNA, Messenger, Neurofilament Proteins, Sirolimus, Protein Transport, Cell Line, Tumor, Mice, Protein Stability

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