Cited by 82Autophagy in Disease and TherapyRetinal Diseases and TreatmentsUbiquitin and proteasome pathways

p62 provides dual cytoprotection against oxidative stress in the retinal pigment epithelium.

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Wang, Lei, Cano, Marisol, Handa, James T.·2014·Biochimica et Biophysica Acta (BBA) - Molecular Cell Research

Abstract

As a signaling hub, p62/sequestosome plays important roles in cell signaling and degradation of misfolded proteins. p62 has been implicated as an adaptor protein to mediate autophagic clearance of insoluble protein aggregates in age-related diseases, including age-related macular degeneration (AMD), which is characterized by dysfunction of the retinal pigment epithelium (RPE). Our previous studies have shown that cigarette smoke (CS) induces oxidative stress and inhibits the proteasome pathway in cultured human RPE cells, suggesting that p62-mediated autophagy may become the major route to remove impaired proteins under such circumstances. In the present studies, we found that all p62 mRNA variants are abundantly expressed and upregulated by CS induced stress in cultured human RPE cells, yet isoform1 is the major translated form. We also show that p62 silencing exacerbated the CS induced accumulation of damaged proteins, both by suppressing autophagy and by inhibiting the Nrf2 antioxidant response, which in turn, increased protein oxidation. These effects of CS and p62 reduction were further confirmed in mice exposed to CS. We found that over-expression of p62 isoform1, but not its S403A mutant, which lacks affinity for ubiquitinated proteins, reduced misfolded proteins, yet simultaneously promoted an Nrf2-mediated antioxidant response. Thus, p62 provides dual, reciprocal enhancing protection to RPE cells from environmental stress induced protein misfolding and aggregation, by facilitating autophagy and the Nrf2 mediated antioxidant response, which might be a potential therapeutic target against AMD.

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Authors
Wang, L., Cano, M., & Handa, J. T.
Affiliations
Johns Hopkins University (US)
Corresponding author
Handa, James T.
Venue
Biochimica et Biophysica Acta (BBA) - Molecular Cell Research
Publisher
Elsevier BV
Published
2014-07
Volume
1843
Issue
7
Pages
1248-1258
ISSN
0167-4889 (ISSN-L)
OpenAlex
W2129325060
Cited by
82
References
51
Citations by year
2026: 4 · 2025: 2 · 2024: 2 · 2023: 5 · 2022: 5 · 2021: 10 · 2020: 8 · 2019: 6 · 2018: 11 · 2017: 11 · 2016: 9 · 2015: 6 · 2014: 3
FWCI
7.32
Type
journal article
Language
en
Open access
Locations
  • Biochimica et Biophysica Acta (BBA) - Molecular Cell Research (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Research to Prevent Blindness
  • National Eye Institute (EY14005, R01EY014005, P30EY001765, EY019904, R01EY019904)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
p62, retinal pigment epithelium, age-related macular degeneration, cigarette smoke, oxidative stress, autophagy, Nrf2 antioxidant response, protein misfolding, protein aggregation, ubiquitinated proteins, protein oxidation, proteasome inhibition
MeSH terms
Sequestosome-1 Protein, Animals, Autophagy, Cell Line, Epithelial Cells, Gene Expression Regulation, Humans, RNA, Messenger, Smoke, Nicotiana, Signal Transduction, Protein Folding, Oxidative Stress, Cytoprotection, Protein Isoforms, RNA, Small Interfering, Adaptor Proteins, Signal Transducing, NF-E2-Related Factor 2, Mice, Retinal Pigment Epithelium

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