Cited by 215Autophagy in Disease and TherapyGenetics, Aging, and Longevity in Model OrganismsUbiquitin and proteasome pathways

p62, Ref(2)P and ubiquitinated proteins are conserved markers of neuronal aging, aggregate formation and progressive autophagic defects

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Bartlett, Bryan J., Isakson, Pauline, Lewerenz, Jan, Sanchez, Heriberto, Kotzebue, Roxanne W., Cumming, Robert C., Harris, Greg L., Nezis, Ioannis P. +3 more·2011·Autophagy

Abstract

Suppression of macroautophagy, due to mutations or through processes linked to aging, results in the accumulation of cytoplasmic substrates that are normally eliminated by the pathway. This is a significant problem in long-lived cells like neurons, where pathway defects can result in the accumulation of aggregates containing ubiquitinated proteins. The p62/Ref(2)P family of proteins is involved in the autophagic clearance of cytoplasmic protein bodies or sequestosomes. These unique structures are closely associated with protein inclusions containing ubiquitin as well as key components of the autophagy pathway. In this study we show that detergent fractionation followed by western blot analysis of insoluble ubiquitinated proteins (IUP), mammalian p62 and its Drosophila homologue, Ref(2)P can be used to quantitatively assess the activity level of aggregate clearance (aggrephagy) in complex tissues. Using this technique we show that genetic or age-dependent changes that modify the long-term enhancement or suppression of aggrephagy can be identified. Moreover, using the Drosophila model system this method can be used to establish autophagy-dependent protein clearance profiles that are occurring under a wide range of physiological conditions including developmental, fasting and altered metabolic pathways. This technique can also be used to examine proteopathies that are associated with human disorders such as frontotemporal dementia, Huntington and Alzheimer disease. Our findings indicate that measuring IUP profiles together with an assessment of p62/Ref(2)P proteins can be used as a screening or diagnostic tool to characterize genetic and age-dependent factors that alter the long-term function of autophagy and the clearance of protein aggregates occurring within complex tissues and cells.

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Authors
Bartlett, B. J., Isakson, P., Lewerenz, J., Sanchez, H., Kotzebue, R. W., Cumming, R. C., Harris, G. L., Nezis, I. P., Schubert, D. R., Simonsen, A., & Finley, K. D.
Affiliations
  • San Diego State University (US)
  • University of Oslo (NO)
  • Salk Institute for Biological Studies (US)
Venue
Autophagy
Published
2011-06
Volume
7
Issue
6
Pages
572-583
ISSN
  • 1554-8627 (ISSN-L)
  • 1554-8635
OpenAlex
W2014829450
Cited by
215
References
74
Citations by year
2026: 8 · 2025: 14 · 2024: 13 · 2023: 15 · 2022: 15 · 2021: 17 · 2020: 13 · 2019: 13 · 2018: 15 · 2017: 12 · 2016: 22 · 2015: 17 · 2014: 18 · 2013: 11 · 2012: 12
FWCI
9.84
Type
journal article
Language
en
Open access
Locations
  • Autophagy (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Scholarship@Western (Western University) (submittedVersion)
Funders
National Institute on Aging (R21AG030187, R01AG033283, R44AG033427, R43AG033427, R01AG039628)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
p62, neuronal aging, aggrephagy, protein aggregate clearance, ubiquitinated proteins, autophagy defects, Drosophila, frontotemporal dementia, Huntington's disease, Alzheimer's disease, proteinopathies
MeSH terms
Sequestosome-1 Protein, Alzheimer Disease, Animals, Autophagy, Cytoplasm, Detergents, DNA-Binding Proteins, Drosophila melanogaster, Humans, Models, Biological, Models, Genetic, Mutation, Neurons, Nuclear Proteins, Time Factors, Gene Expression Regulation, Developmental, Drosophila Proteins, Animals, Genetically Modified, Microscopy, Electron, Transmission, Adaptor Proteins, Signal Transducing

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