Reappraisal of the anatomical spreading and propagation hypothesis about TDP-43 aggregation in amyotrophic lateral sclerosis and frontotemporal lobar degeneration.

Neuropathology : Official Journal of the Japanese Society of Neuropathology
Yuichi Riku

Abstract

Neuronal inclusion of transactivation response DNA-binding protein 43 kDa (TDP-43) is known to be a pathologic hallmark of amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD). TDP-43, which is physiologically a nuclear protein, is mislocalized from the nucleus and aggregated within the cytoplasm of affected neurons in ALS and FTLD patients. Neuropathologic or experimental studies have addressed mechanisms underlying spreading of TDP-43 inclusions in the central nervous system of ALS and FTLD patients. On the basis of postmortem observations, it is hypothesized that TDP-43 inclusions spread along the neural projections. A centrifugal gradient of TDP-43 pathology in certain anatomical systems and axonal or synaptic aggregation of TDP-43 may support the hypothesis. Experimental studies have revealed cell-to-cell propagation of aggregated or truncated TDP-43, which indicates a direct transmission of TDP-43 inclusions to contiguous cells. However, discrepancies remain between the cell-to-cell propagation suggested in the experimental models and the anatomical spreading of TDP-43 aggregations based on postmortem observations. Trans-synaptic transmission, rather than the direct cell-to-cell transmission, m...Continue Reading

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Citations

Sep 3, 2020·Neuropathology : Official Journal of the Japanese Society of Neuropathology·Toshiki UchiharaMari Yoshida
Jun 20, 2020·Annals of Clinical and Translational Neurology·Marta GromichoMamede de Carvalho
Jun 6, 2020·Journal of Neural Transmission·F GeserG K Wenning
May 1, 2021·International Journal of Molecular Sciences·Francesco LiguoriCinzia Volonté

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