Cited by 110Retinal Diseases and TreatmentsRetinal Development and DisordersRetinal and Macular Surgery

Subducted and melanotic cells in advanced age-related macular degeneration are derived from retinal pigment epithelium

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Zanzottera, Emma C., Messinger, Jeffrey D., Ach, Thomas, Smith, R. Theodore, Curcio, Christine A.·2015·Investigative Opthalmology & Visual Science

Abstract

PURPOSE: To describe, illustrate, and account for two cell types plausibly derived from RPE in geographic atrophy (GA) and choroidal neovascularization (CNV) of AMD, using melanosomes, lipofuscin, and basal laminar deposit (BLamD) as anatomical markers. METHODS: Human donor eyes with GA (n = 13) or CNV (n = 39) were histologically processed, photodocumented, and analyzed for frequencies of occurrence. We defined RPE as cells containing spindle-shaped melanosomes and RPE lipofuscin, internal to basal lamina or BLamD, if present, or Bruch's membrane if not, and RPE-derived cells as those plausibly derived from RPE and not attached to basal lamina or BLamD. RESULTS: 'Subducted' cells contain RPE melanosomes and localize to the sub-RPE space, on Bruch's membrane. Credible transitional forms from RPE cells were seen. Grades of RPE overlying 'Subducted' cells were 'Atrophic with BLamD' (32.2% vs. 37.0% of 'Subducted,' for GA and CNV eyes, respectively), 'Dissociated' (22.0% vs. 21.7%), 'Nonuniform' (22.0% vs. 23.9%), and 'Sloughed' RPE (10.2% vs. 4.3%). Found exclusively in CNV scars, 'Melanotic' cells containing spherical melanosomes were adjacent to 'Entombed' RPE with spindle-shaped and spherical melanosomes. Of subretinal 'Melanotic' cells, 40.0% associated with 'Atrophy with BLamD,' 36.8% with 'Atrophy without BLamD,' and 20.6% with 'Entombed.' CONCLUSIONS: 'Dissociated' RPE within atrophic areas may be the source of 'Subducted' cells. 'Entombed' RPE within fibrovascular and fibrocellular scars may be the source of 'Melanotic' cells. An imaging correlate for 'Subducted' cells awaits discovery; 'Melanotic' cells appear gray-black in the CNV fundus. Results provide a basis for future molecular phenotyping studies.

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  • RPE trans-differentiation from epithelial to mesenchymal phenotype may make these cells adhere to and pull on the extracellular matrix, possibly contributing to clinical atrophy progression.

    “This trans-differentiation of retinal pigment epithelial cells from epithelial to mesenchymal phenotype can cause the RPE cells to adhere to and exert traction forces on the extracellular matrix and could be one of the factors contributing to the evolution of atrophy clinically.41-43”

    From Development and Course of Scars in the Comparison of Age-Related Macular Degeneration Treatments Trials (2018) · cites this paper as [42]

    The section ‘Does RPE Undergo Transdifferentiation in AMD?’ discusses epithelial-to-mesenchymal transition as a possible RPE process and notes contractile behavior in cultured RPE, while emphasizing that whether this transition occurs in AMD remains unresolved. The Conclusions mention prognostic significance for one RPE-cell pattern in atrophy progression. Neither section says that RPE cells adhere to and exert traction on the extracellular matrix or that such forces contribute to clinical atrophy progression. (LLM, conf=0.84)

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Research works printed but not linked: 3

  1. Dell'Angelica EC, Mullins C, Caplan S, Bonifacino JS. Lyso- some-related organelles. FASEB J. 2000;14:1265-1278.
  2. Schaal KB, Freund KB, Litts KM, Zhang Y, Messinger JD, Curcio CA. Outer retinal tubulation in age-related macular degener- ation: optical coherence tomographic findings correspond with histology [published online ahead of print January 29, 2015]. Retina. PMID 25635579.
  3. Smith RT, Post R, Johri A, et al. Simultaneous decomposition of multiple hyperspectral datasets: fluorophore signal recovery in the retinal pigment epithelium (RPE). Biomed Opt Express. 2014;5:4171-4185.

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Authors
Zanzottera, E. C., Messinger, J. D., Ach, T., Smith, R. T., & Curcio, C. A.
Affiliations
  • University of Alabama (US)
  • New York University (US)
Corresponding author
Curcio, Christine A.
Venue
Investigative Opthalmology & Visual Science
Published
2015-05-21
Volume
56
Issue
5
Pages
3269
ISSN
  • 0146-0404 (ISSN-L)
  • 1552-5783
OpenAlex
W2419123448
Cited by
110
References
55
Citations by year
2026: 5 · 2025: 12 · 2024: 11 · 2023: 5 · 2022: 12 · 2021: 7 · 2020: 7 · 2019: 11 · 2018: 11 · 2017: 12 · 2016: 12 · 2015: 5
FWCI
12.80
Type
journal article
Language
en
Open access
Licence
public-domain
Locations
  • Investigative Ophthalmology & Visual Science (publishedVersion, public-domain)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • EyeSight Foundation of Alabama (EY06109)
  • International Retinal Research Foundation (EY06109)
  • Research to Prevent Blindness (EY06109, EY015520)
  • Edward N. and Della L. Thome Memorial Foundation
  • Arnold and Mabel Beckman Initiative for Macular Research
  • Università degli Studi di Milano
  • Deutsche Forschungsgemeinschaft (AC265/1-1, EY06109)
  • National Eye Institute (R01EY015520, R01EY021470, R01EY006109, EY06109, P30EY003039)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Retinal and Macular Surgery
Keywords
age-related macular degeneration, geographic atrophy, choroidal neovascularization, retinal pigment epithelium, melanosomes, lipofuscin, basal laminar deposits, Bruch's membrane, retinal pigment epithelium atrophy
MeSH terms
Aged, Aged, 80 and over, Basement Membrane, Female, Humans, Lipofuscin, Macular Degeneration, Male, Biomarkers, Bruch Membrane, Choroidal Neovascularization, Melanosomes, Retinal Pigment Epithelium, Geographic Atrophy

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