Cited by 68Autophagy in Disease and TherapyRetinal Development and DisordersRetinal Diseases and Treatments

Circadian and noncircadian modulation of autophagy in photoreceptors and retinal pigment epithelium

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Yao, Jingyu, Jia, Lin, Shelby, Shameka J., Ganios, Anna M., Feathers, Kecia, Thompson, Debra A., Zacks, David N.·2014·Investigative Opthalmology & Visual Science

Abstract

PURPOSE: Autophagy in photoreceptors and the RPE promotes homeostasis and survival. The purpose of this study is to determine the daily pattern of changes in autophagy and factors contributing to its regulation in the outer retina. METHODS: Levels of autophagy markers in the retina and RPE were evaluated over a 24-hour period. To assess the role of phagocytosis in stimulating autophagy in the RPE, cultured RPE-J cells were incubated with isolated photoreceptor outer segments and levels of autophagy markers were measured. Electron microscopy was performed on retina sections and RPE-J cells to assess formation of double-membraned vesicles consistent with autophagosomes. RESULTS: In wild-type C57BL/6 mice maintained under normal cycling light conditions, autophagy in photoreceptor cells and the RPE exhibited a bimodal pattern of activation. In photoreceptors, shifts between light and dark evoked a sharp decrease in autophagy that was followed by a time-dependent increase. In photoreceptors, translocation of transducin and arrestin from the outer to inner segment appeared to contribute to the light-dependent upregulation of autophagy. In contrast, the cyclic variations in RPE autophagy were independent of lighting conditions, and are triggered, at least in part, by ingestion of outer segments. CONCLUSIONS: Activation of autophagy in the outer retina exhibits a bimodal pattern that correlates with shifts in transduction proteins within the photoreceptor and by circadian ingestion of outer segments in the RPE. These dynamic shifts suggest a critical role for this pathway in maintaining homeostasis, with further study needed to define the mechanisms underlying the regulation of this phenomenon.

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  1. Sanjuan MA, Dillon CP, Tait SW, et al. Toll-like receptor signaling inmacrophages links the autophagy pathway to phagocytosis. Nature. 2007;450:1253-1257.

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Authors
Yao, J., Jia, L., Shelby, S. J., Ganios, A. M., Feathers, K., Thompson, D. A., & Zacks, D. N.
Affiliations
University of Michigan (US)
Corresponding author
Zacks, David N.
Venue
Investigative Opthalmology & Visual Science
Published
2014-05-27
Volume
55
Issue
5
Pages
3237
ISSN
  • 0146-0404 (ISSN-L)
  • 1552-5783
OpenAlex
W2012171955
Cited by
68
References
52
Citations by year
2026: 1 · 2025: 4 · 2024: 4 · 2023: 2 · 2022: 3 · 2021: 11 · 2020: 9 · 2019: 7 · 2018: 7 · 2017: 5 · 2016: 5 · 2015: 6 · 2014: 4
FWCI
5.04
Type
journal article
Language
en
Open access
Locations
  • Investigative Ophthalmology & Visual Science (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Research to Prevent Blindness (EY007003)
  • Yale University
  • National Eye Institute (R01EY020823, EY-020823, EY-007003, F31EY007003, P30EY007003)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
Keywords
autophagy, circadian rhythm, photoreceptors, retinal pigment epithelium, photoreceptor outer segment phagocytosis, arrestin, light-dark cycle, autophagosomes
MeSH terms
Animals, Autophagy, Cells, Cultured, Circadian Rhythm, Homeostasis, Mice, Inbred C57BL, Microscopy, Electron, Signal Transduction, Photoreceptor Cells, Vertebrate, Mice, Retinal Pigment Epithelium

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