Cited by 137Autophagy in Disease and TherapyMitochondrial Function and PathologyParkinson's Disease Mechanisms and Treatments

Degradation of engulfed mitochondria is rate-limiting in Optineurin-mediated mitophagy in neurons

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Evans, Chantell S, Holzbaur, Erika LF·2020·eLife

Abstract

Mitophagy, the selective removal of damaged mitochondria, is thought to be critical to maintain neuronal homeostasis. Mutations of proteins in the pathway cause neurodegenerative diseases, suggesting defective mitochondrial turnover contributes to neurodegeneration. In primary rat hippocampal neurons, we developed a mitophagy induction paradigm where mild oxidative stress induced low levels of mitochondrial damage. Mitophagy-associated proteins were sequentially recruited to depolarized mitochondria followed by sequestration into autophagosomes. The localization of these mitophagy events had a robust somal bias. In basal and induced conditions, engulfed mitochondria remained in non-acidified organelles for hours to days, illustrating efficient autophagosome sequestration but delayed lysosomal fusion or acidification. Furthermore, expression of an ALS-linked mutation in the pathway disrupted mitochondrial network integrity and this effect was exacerbated by oxidative stress. Thus, age-related decline in neuronal health or expression of disease-associated mutations in the pathway may exacerbate the slow kinetics of neuronal mitophagy, leading to neurodegeneration.

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  • The majority of pathogenic OPTN mutations are located in its UBAN domain and may impair ubiquitin binding.

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Authors
Evans, C. S., & Holzbaur, E. L.
Affiliations
University of Pennsylvania (US)
Corresponding author
Holzbaur, Erika LF
Venue
eLife
Published
2020-01-14
Volume
9
ISSN
2050-084X (ISSN-L)
OpenAlex
W2999206621
Cited by
137
References
113
Citations by year
2026: 13 · 2025: 20 · 2024: 26 · 2023: 20 · 2022: 26 · 2021: 25 · 2020: 7
FWCI
13.99
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institute of Neurological Disorders and Stroke (R37 NS060698)
  • Howard Hughes Medical Institute (Hanna H Gray Fellowship)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
Keywords
mitophagy, optineurin, mitochondrial degradation, lysosome fusion, lysosomal acidification, oxidative stress, mitochondrial depolarization, amyotrophic lateral sclerosis, neuronal health, neurodegeneration, hippocampal neurons, age-related decline
MeSH terms
Autophagosomes, Animals, Autophagy, Axons, HeLa Cells, Hippocampus, Humans, Kinetics, Lysosomes, Mitochondria, Mutation, Neurons, Phagosomes, Protein Kinases, Rats, Sprague-Dawley, Reactive Oxygen Species, Oxidative Stress, Neurodegenerative Diseases, RNA, Small Interfering, Transcription Factor TFIIIA, Rats, Membrane Potential, Mitochondrial, Mitophagy

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