Cited by 127Retinal Development and DisordersRetinal Diseases and TreatmentsOcular Diseases and Behçet’s Syndrome

Chemokine-mediated inflammation in the degenerating retina is coordinated by Müller cells, activated microglia, and retinal pigment epithelium

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Rutar, Matt, Natoli, Riccardo, Chia, RX, Valter, Krisztina, Provis, Jan M·2015·Journal of Neuroinflammation

Abstract

BACKGROUND: Monocyte infiltration is involved in the pathogenesis of many retinal degenerative conditions. This process traditionally depends on local expression of chemokines, though the roles of many of these in the degenerating retina are unclear. Here, we investigate expression and in situ localization of the broad chemokine response in a light-induced model of retinal degeneration. METHODS: Sprague-Dawley (SD) rats were exposed to 1,000 lux light damage (LD) for up to 24 hrs. At time points during (1 to 24 hrs) and following (3 and 7 days) exposure, animals were euthanized and retinas processed. Microarray analysis assessed differential expression of chemokines. Some genes were further investigated using polymerase chain reaction (PCR) and in situ hybridization and contrasted with photoreceptor apoptosis using terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL). Recruitment of retinal CD45 (+) leukocytes was determined via fluorescence activated cell sorting (FACS), and expression of chemokine receptors determined using PCR. RESULTS: Exposure to 24 hrs of LD resulted in differential expression of chemokines including Ccl3, Ccl4, Ccl7, Cxcl1, and Cxcl10. Their upregulation correlated strongly with peak photoreceptor death, at 24 hrs exposure. In situ hybridization revealed that the modulated chemokines were expressed by a combination of Müller cells, activated microglia, and retinal pigment epithelium (RPE). This preceded large increases in the number of CD45(+) cells at 3- and 7-days post exposure, which expressed a corresponding repertoire of chemokine receptors. CONCLUSIONS: Our data indicate that retinal degeneration induces upregulation of a broad chemokine response whose expression is coordinated by Müller cells, microglia, and RPE. The findings inform our understanding of the processes govern the trafficking of leukocytes, which are contributors in the pathology of retinal degenerations.

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Authors
Rutar, M., Natoli, R., Chia, R., Valter, K., & Provis, J. M.
Affiliations
Australian National University (AU)
Corresponding author
Rutar, Matt
Venue
Journal of Neuroinflammation
Published
2015
Volume
12
Issue
1
Pages
8
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2000919900
Cited by
127
References
97
Citations by year
2026: 8 · 2025: 9 · 2024: 9 · 2023: 9 · 2022: 11 · 2021: 13 · 2020: 16 · 2019: 9 · 2018: 13 · 2017: 13 · 2016: 11 · 2015: 3 · 2014: 2
FWCI
5.79
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by)
  • ANU Open Research (Australian National University) (submittedVersion, cc-by)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Health Sciences › Medicine › Ophthalmology › Ocular Diseases and Behçet’s Syndrome
Keywords
chemokines, retinal degeneration, Müller cells, microglia, retinal pigment epithelium, photoreceptor apoptosis, light-induced retinal damage, monocyte infiltration, chemokine receptors, neuroinflammation, leukocyte migration, CCL3, carbon tetrachloride, CCL7, CXCL1, CXCL10
MeSH terms
Animals, Disease Models, Animal, Flow Cytometry, Gene Expression Regulation, Inflammation, Light, Photoreceptor Cells, Retina, Retinal Degeneration, RNA, Messenger, Time Factors, Cell Death, Rats, Sprague-Dawley, Microglia, Statistics, Nonparametric, Chemokines, Microarray Analysis, Rats, Retinal Pigment Epithelium, Ependymoglial Cells

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