Journal
FREE RADICAL BIOLOGY AND MEDICINE
Volume 48, Issue 9, Pages 1152-1161Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2010.01.035
Keywords
TDP-43; Zinc; Neurotoxicity; Protein aggregation; Nuclear inclusions; Amyotrophic lateral sclerosis; Motor neuron disease; Frontotemporal lobar degeneration; Free radicals
Funding
- National Health and Medical Research Council of Australia
- Australian Research Council of Australia
- Motor Neuron Disease Research Institute of Australia
- Bethlehem Griffiths Research Foundation
- CASS Foundation
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Ubiquitinated neuronal aggregates containing TDP-43 are pathological hallmarks in the spectrum of frontotemporal lobar dementia (FTLD) and amyotrophic lateral sclerosis (ALS). In affected neurons, TDP-43 undergoes C-terminal fragmentation, phosphorylation, and ubiquitination and forms aggregates in the cytoplasm or nucleus. Although in vitro studies have been able to recapitulate these features using transfected cell culture models, little is known about the biochemical mechanisms that underlie pathological changes to endogenous TDP-43. As altered metal ion homeostasis and increased oxidative stress are central features of neurodegeneration, including FTLD and ALS, we sought to determine the affects of these factors on endogenous TDP-43 metabolism in mammalian cells. Treatment of SY5Y neuronal-like cells expressing endogenous TDP-43 with zinc (Zn) induced depletion of TDP-43 expression and formation of inclusions that were TDP-43 positive. TDP-43 was also detected in the cytosol of Zn-affected cells but this was not aggregated. No evidence of C-terminal fragmentation, phosphorylation, or ubiquitination was observed. The depletion and aggregation of TDP-43 were associated with the specific action of Zn but were not seen with copper, iron, or H2O2. These studies describe for the first time specific induction of endogenous TDP-43 aggregation in neuronal-like cells and suggest that specific Zn-associated processes could affect TDP-43 metabolism in neurodegenerative diseases. (C) 2010 Elsevier Inc. All rights reserved.
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