Cited by 319Retinal Development and DisordersRetinal Diseases and TreatmentsPhagocytosis and Immune Regulation

Loss of synchronized retinal phagocytosis and age-related blindness in mice lacking αvβ5 integrin

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Nandrot, Emeline F., Kim, Yoonhee, Brodie, Scott E., Huang, Xiaozhu, Sheppard, Dean, Finnemann, Silvia C.·2004·The Journal of Experimental Medicine

Abstract

Daily phagocytosis by the retinal pigment epithelium (RPE) of spent photoreceptor outer segment fragments is critical for vision. In the retina, early morning circadian photoreceptor rod shedding precedes synchronized uptake of shed photoreceptor particles by RPE cells. In vitro, RPE cells use the integrin receptor alphavbeta5 for particle binding. Here, we tested RPE phagocytosis and retinal function in beta5 integrin--deficient mice, which specifically lack alphavbeta5 receptors. Retinal photoresponses severely declined with age in beta5-/- mice, whose RPE accumulated autofluorescent storage bodies that are hallmarks of human retinal aging and disease. beta5-/- RPE in culture failed to take up isolated photoreceptor particles. beta5-/- RPE in vivo retained basal uptake levels but lacked the burst of phagocytic activity that followed circadian photoreceptor shedding in wild-type RPE. Rhythmic activation of focal adhesion and Mer tyrosine kinases that mediate wild-type retinal phagocytosis was also completely absent in beta5-/- retina. These results demonstrate an essential role for alphavbeta5 integrin receptors and their downstream signaling pathways in synchronizing retinal phagocytosis. Furthermore, they identify the beta5-/- integrin mouse strain as a new animal model of age-related retinal dysfunction.

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Crossref · 10.1084/jem.20041447

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  • β5−/− mice do not exhibit the characteristic peak of tyrosine phosphorylation seen in MERTK after light onset.

    “Indeed, β5−/− mice do not exhibit the characteristic peak of tyrosine phosphorylation seen in MERTK after light onset (Nandrot et al., 2004).”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Nandrot et al., 2004

  • FAK operates downstream of αvβ5 integrin and shows a diurnal pattern of phosphorylation similar to that of MERTK, peaking after light onset and diminishing as phagosome degradation proceeds.

    “FAK operates downstream of αvβ5 integrin and shows a diurnal pattern of phosphorylation similar to that of MERTK, peaking after light onset and diminishing as phagosome degradation proceeds (Nandrot et al., 2004).”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Nandrot et al., 2004

  • In the absence of the β5 subunit, the daily rhythm of phagocytosis is lost and while OS ingestion is impaired, it is not absent, suggesting the existence of potential β5 compensatory mechanisms.

    “In the absence of the β5 subunit, the daily rhythm of phagocytosis is lost and while OS ingestion is impaired, it is not absent (Nandrot et al., 2004), suggesting the existence of potential β5 compensatory mechanisms.”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Nandrot et al., 2004

  • Secondary effects on the expression of receptors involved in POS binding and phagocytosis due to the deletion of Atg5 were not observed in Atg5ΔRPE RPE cells compared to control.

    “Secondary effects on the expression of receptors involved in POS binding and phagocytosis (Gal et al., 2000; Nandrot et al., 2007; Nandrot et al., 2004) due to the deletion of Atg5 were not observed in Atg5ΔRPE RPE cells compared to control (Figure S1).”

    From Noncanonical autophagy promotes the visual cycle (2013) · cites this paper as Nandrot et al., 2004

  • In WT RPE, phagosome numbers reached a sharp peak within an hour of lights on.

    “In WT RPE, phagosome numbers reached a sharp peak within an hour of lights on (Figure 4A) (LaVail, 1980; Gibbs et al., 2003; Nandrot et al., 2004).”

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Authors
Nandrot, E. F., Kim, Y., Brodie, S. E., Huang, X., Sheppard, D., & Finnemann, S. C.
Affiliations
  • 1Margaret M. Dyson Vision Research Institute, Department of Ophthalmology
  • Icahn School of Medicine at Mount Sinai (US)
  • University of California, San Francisco (US)
  • Cornell University (US)
Venue
The Journal of Experimental Medicine
Published
2004-12-13
Volume
200
Issue
12
Pages
1539-1545
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2160550697
Cited by
319
References
33
Citations by year
2026: 7 · 2025: 9 · 2024: 7 · 2023: 15 · 2022: 20 · 2021: 22 · 2020: 21 · 2019: 18 · 2018: 22 · 2017: 19 · 2016: 13 · 2015: 19 · 2014: 17 · 2013: 18 · 2012: 12
FWCI
2.97
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
  • eScholarship (California Digital Library) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by-nc-sa)
Funders
  • National Heart, Lung, and Blood Institute (R37HL053949, HL53949, HL-64353, R01HL064353, R01HL053949)
  • National Eye Institute (R01EY013295, EY-13295, EY-14184, R03EY014184)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
Keywords
retinal pigment epithelium, photoreceptor outer segment phagocytosis, integrin αvβ5, retinal aging, focal adhesions, MERTK
MeSH terms
c-Mer Tyrosine Kinase, Aging, Animals, Blindness, Circadian Rhythm, Disease Models, Animal, Phagocytosis, Pigment Epithelium of Eye, Proto-Oncogene Proteins, Signal Transduction, Integrins, Retinal Rod Photoreceptor Cells, Mice, Knockout, Receptors, Vitronectin, Receptor Protein-Tyrosine Kinases, Focal Adhesions, Integrin beta Chains, Mice

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