COPI-regulated mitochondria-ER contact site formation maintains axonal integrity.

Autor:	Maddison DC; UK Dementia Research Institute, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK., Malik B; UK Dementia Research Institute, School of Biosciences, Cardiff University, Cardiff CF24 4HQ, UK., Amadio L; UK Dementia Research Institute, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK; UK Dementia Research Institute, School of Biosciences, Cardiff University, Cardiff CF24 4HQ, UK., Bis-Brewer DM; John P. Hussman Institute for Human Genomics, University of Miami, Miami, FL, USA; Dr. John T. Macdonald Foundation Department of Human Genetics, University of Miami, Miami, FL, USA., Züchner S; John P. Hussman Institute for Human Genomics, University of Miami, Miami, FL, USA; Dr. John T. Macdonald Foundation Department of Human Genetics, University of Miami, Miami, FL, USA., Peters OM; UK Dementia Research Institute, School of Biosciences, Cardiff University, Cardiff CF24 4HQ, UK., Smith GA; UK Dementia Research Institute, School of Medicine, Cardiff University, Cardiff CF24 4HQ, UK. Electronic address: smithga@cf.ac.uk.
Jazyk:	angličtina
Zdroj:	Cell reports [Cell Rep] 2023 Aug 29; Vol. 42 (8), pp. 112883. Date of Electronic Publication: 2023 Jul 26.
DOI:	10.1016/j.celrep.2023.112883
Abstrakt:	Coat protein complex I (COPI) is best known for its role in Golgi-endoplasmic reticulum (ER) trafficking, responsible for the retrograde transport of ER-resident proteins. The ER is crucial to neuronal function, regulating Ca 2+ homeostasis and the distribution and function of other organelles such as endosomes, peroxisomes, and mitochondria via functional contact sites. Here we demonstrate that disruption of COPI results in mitochondrial dysfunction in Drosophila axons and human cells. The ER network is also disrupted, and the neurons undergo rapid degeneration. We demonstrate that mitochondria-ER contact sites (MERCS) are decreased in COPI-deficient axons, leading to Ca 2+ dysregulation, heightened mitophagy, and a decrease in respiratory capacity. Reintroducing MERCS is sufficient to rescue not only mitochondrial distribution and Ca 2+ uptake but also ER morphology, dramatically delaying neurodegeneration. This work demonstrates an important role for COPI-mediated trafficking in MERC formation, which is an essential process for maintaining axonal integrity. Competing Interests: Declaration of interests The authors declare no competing interests. (Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze:	MEDLINE
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