Abstract
The Tar DNA-Binding Protein 43 (TDP-43) and its phosphorylated isoform (pTDP-43) are the major components associated with ubiquitin positive/Tau-negative inclusions found in neurons and glial cells of patients suffering of amyotrophic lateral sclerosis (ALS) or frontotemporal lobar degeneration-TDP-43 (FTLD–TDP). Many studies have revealed that TDP-43 is also in the protein inclusions associated with neurodegenerative conditions other than ALS and FTLD–TDP, thus suggesting that this protein may be involved in the pathogenesis of a variety of neurological disorders. In brains of Huntington-affected patients, pTDP-43 aggregates were shown to co-localize with mutant Huntingtin (mHtt) inclusions. Here, we show that expression of mHtt carrying 80–97 polyglutamines repeats in human cell cultures induces the aggregation and the phosphorylation of endogenous TDP-43, whereas non-pathological Htt with 25 polyglutamines repeats has no effect. Mutant Htt aggregation precedes accumulation of pTDP-43 and pTDP-43 co-localizes with mHtt inclusions reminding what it was previously described in brains of Huntington-affected patients. Detergent-insoluble fractions from cells expressing mHtt and containing mHtt–pTDP-43 co-aggregates can function as seeds for further TDP-43 aggregation in human cell culture. The human cellular prion protein PrPC was previously identified as a negative modulator of mHtt aggregation; here, we show that PrPC-mediated reduction of mHtt aggregation is tightly correlated with a decrease of TDP-43 aggregation and phosphorylation, thus confirming the close relationships between TDP-43 and mHtt.
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Acknowledgements
This work was supported by the CNRS and the INSERM (PL), and Grant-in-Aid for Scientific Research on Innovative Areas (Brain Protein Aging and Dementia Control) (JP26117005) from MEXT (to M.H.), a Grant-in-Aid for Scientific Research on Brain Mapping by Integrated Neurotechnologies for Disease Studies (Brain/MINDS) (JP14533254) from AMED (to M.H.), JST CREST Grant number JP18071300, Japan, and a Grant from Brain Science Foundation (to T.N.). PL received the support of the Association pour la recherche sur la SLA (ARSLA), the NeuroDis Fundation and the AFM (AFM-MyoNeuralp). LC received for his PhD an ARC2 “Qualité de vie et Viellissement” Grant from the région Auvergne Rhône-Alpes. We thank Didier Vilette (ENVT–Toulouse) for carefully reading the manuscript and helpful discussions. We acknowledge the LYMIC-PLATIM and the CIQLE microscope platforms at ENS Lyon (SFR Biosciences Gerland–Lyon Sud UMS3444/US8, France) and at the Faculté de médecine Rockefeller (Lyon Est, France) respectively.
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TN, LC and PL conducted the experiments. All the authors interpreted the data and corrected the paper. PL wrote the manuscript.
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Coudert, L., Nonaka, T., Bernard, E. et al. Phosphorylated and aggregated TDP-43 with seeding properties are induced upon mutant Huntingtin (mHtt) polyglutamine expression in human cellular models. Cell. Mol. Life Sci. 76, 2615–2632 (2019). https://doi.org/10.1007/s00018-019-03059-8
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DOI: https://doi.org/10.1007/s00018-019-03059-8