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Nat Commun. 2014 Jun 3;5:3996. doi: 10.1038/ncomms4996.

ER-mitochondria associations are regulated by the VAPB-PTPIP51 interaction and are disrupted by ALS/FTD-associated TDP-43.

Author information

1
1] Department of Neuroscience, Institute of Psychiatry, Kings College London, London SE5 8AF, UK [2] Clinical Neurosciences, Institute of Psychiatry, Kings College London, London SE5 8AF, UK [3].
2
1] Department of Neuroscience, Institute of Psychiatry, Kings College London, London SE5 8AF, UK [2] Clinical Neurosciences, Institute of Psychiatry, Kings College London, London SE5 8AF, UK [3] [4].
3
1] Department of Neuroscience, Institute of Psychiatry, Kings College London, London SE5 8AF, UK [2] Clinical Neurosciences, Institute of Psychiatry, Kings College London, London SE5 8AF, UK.
4
1] Department of Neuroscience, Institute of Psychiatry, Kings College London, London SE5 8AF, UK [2].
5
Centre for Ultrastructural Imaging, King's College London, London SE5 8AF, UK.
6
Department of Neuroscience, Mayo Clinic, Jacksonville, Florida 32224, USA.
7
Clinical Neurosciences, Institute of Psychiatry, Kings College London, London SE5 8AF, UK.

Abstract

Mitochondria and the endoplasmic reticulum (ER) form tight structural associations and these facilitate a number of cellular functions. However, the mechanisms by which regions of the ER become tethered to mitochondria are not properly known. Understanding these mechanisms is not just important for comprehending fundamental physiological processes but also for understanding pathogenic processes in some disease states. In particular, disruption to ER-mitochondria associations is linked to some neurodegenerative diseases. Here we show that the ER-resident protein VAPB interacts with the mitochondrial protein tyrosine phosphatase-interacting protein-51 (PTPIP51) to regulate ER-mitochondria associations. Moreover, we demonstrate that TDP-43, a protein pathologically linked to amyotrophic lateral sclerosis and fronto-temporal dementia perturbs ER-mitochondria interactions and that this is associated with disruption to the VAPB-PTPIP51 interaction and cellular Ca(2+) homeostasis. Finally, we show that overexpression of TDP-43 leads to activation of glycogen synthase kinase-3β (GSK-3β) and that GSK-3β regulates the VAPB-PTPIP51 interaction. Our results describe a new pathogenic mechanism for TDP-43.

PMID:
24893131
PMCID:
PMC4046113
DOI:
10.1038/ncomms4996
[Indexed for MEDLINE]
Free PMC Article

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