Cited by 56Retinal Diseases and TreatmentsComplement system in diseasesRetinal Development and Disorders

Synthesis and Propagation of Complement C3 by Microglia/Monocytes in the Aging Retina

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Rutar, Matt, Valter, Krisztina, Natoli, Riccardo, Provis, Jan M.·2014·PLoS ONE

Abstract

INTRODUCTION: Complement activation is thought to contribute to the pathogenesis of age-related macular degeneration (AMD), which may be mediated in part by para-inflammatory processes. We aimed to investigate the expression and localization of C3, a crucial component of the complement system, in the retina during the course of aging. METHODS: SD rats were born and reared in low-light conditions, and euthanized at post-natal (P) days 100, 450, or 750. Expression of C3, IBA1, and Ccl- and Cxcl- chemokines was assessed by qPCR, and in situ hybridization. Thickness of the ONL was assessed in retinal sections as a measure of photoreceptor loss, and counts were made of C3-expressing monocytes. RESULTS: C3 expression increased significantly at P750, and correlated with thinning of the ONL, at P750, and up-regulation of GFAP. In situ hybridization showed that C3 was expressed by microglia/monocytes, mainly from within the retinal vasculature, and occasionally the ONL. The number of C3-expressing microglia increased significantly by P750, and coincided spatiotemporally with thinning of the ONL, and up-regulation of Ccl- and Cxcl- chemokines. CONCLUSIONS: Our data suggest that recruited microglia/monocytes contribute to activation of complement in the aging retina, through local expression of C3 mRNA. C3 expression coincides with age-related thinning of the ONL at P750, although it is unclear whether the C3-expressing monocytes are a cause or consequence. These findings provide evidence of activation of complement during natural aging, and may have relevance to cellular events underling the pathogenesis of age-related retinal diseases.

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  1. [15]Walport MJ (2001) Complement. Second of two parts. N Engl J Med 344: 1140– 1144. 11297706

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Authors
Rutar, M., Valter, K., Natoli, R., & Provis, J. M.
Affiliations
Australian National University (AU)
Corresponding author
Rutar, Matt
Venue
PLoS ONE
Published
2014-04-04
Volume
9
Issue
4
Pages
e93343
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1982513873
Cited by
56
References
76
Citations by year
2025: 4 · 2023: 3 · 2022: 10 · 2021: 5 · 2020: 5 · 2019: 3 · 2018: 8 · 2017: 4 · 2016: 6 · 2015: 5 · 2014: 3
FWCI
5.62
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (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)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • ANU Open Research (Australian National University) (submittedVersion, cc-by)
Funders
Australian Research Council (CE0561903)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
Keywords
complement C3, complement activation, retinal aging, microglia, monocytes, age-related macular degeneration, photoreceptor loss, outer nuclear layer thinning, chemokines, glial fibrillary acidic protein, retinal vasculature
MeSH terms
Aging, Animals, Animals, Newborn, Complement C3, Glial Fibrillary Acidic Protein, Monocytes, Retina, Rats, Sprague-Dawley, Microglia, Chemokines, Rats

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