Cited by 65Retinal Diseases and TreatmentsOcular Diseases and Behçet’s SyndromeComplement system in diseases

Connecting the innate and adaptive immune responses in mouse choroidal neovascularization via the anaphylatoxin C5a and γδT-cells

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Coughlin, Beth, Schnabolk, Gloriane, Joseph, Kusumam, Raikwar, Himanshu, Kunchithapautham, Kannan, Johnson, Krista, Moore, Kristi, Wang, Yi +1 more·2016·Scientific Reports

Abstract

Neovascular age-related macular degeneration (AMD) is characterized by choroidal neovascularization (CNV). An overactive complement system is associated with AMD pathogenesis, and serum pro-inflammatory cytokines, including IL-17, are elevated in AMD patients. IL-17 is produced by complement C5a-receptor-expressing T-cells. In murine CNV, infiltrating γδT- rather than Th17-cells produce the IL-17 measurable in lesioned eyes. Here we asked whether C5a generated locally in response to CNV recruits IL-17-producing T-cells to the eye. CNV lesions were generated using laser photocoagulation and quantified by imaging; T-lymphocytes were characterized by QRT-PCR. CNV resulted in an increase in splenic IL-17-producing γδT- and Th17-cells; yet in the CNV eye, only elevated levels of γδT-cells were observed. Systemic administration of anti-C5- or anti-C5a-blocking antibodies blunted the CNV-induced production of splenic Th17- and γδT-cells, reduced CNV size and eliminated ocular γδT-cell infiltration. In ARPE-19 cell monolayers, IL-17 triggered a pro-inflammatory state; and splenocyte proliferation was elevated in response to ocular proteins. Thus, we demonstrated that CNV lesions trigger a systemic immune response, augmenting local ocular inflammation via the infiltration of IL-17-producing γδT-cells, which are presumably recruited to the eye in a C5a-dependent manner. Understanding the complexity of complement-mediated pathological mechanisms will aid in the development of an AMD treatment.

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  1. Zrenner E. Light-induced damage to the eye. Fortschr. Ophthalmol. 87, S41– S51 (1990). 2083911

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Authors
Coughlin, B., Schnabolk, G., Joseph, K., Raikwar, H., Kunchithapautham, K., Johnson, K., Moore, K., Wang, Y., & Rohrer, B.
Affiliations
  • Medical University of South Carolina (US)
  • Ralph H. Johnson VA Medical Center (US)
  • Alexion Pharmaceuticals (United States) (US)
Corresponding author
Rohrer, Bärbel
Venue
Scientific Reports
Published
2016-03-31
Volume
6
Issue
1
Pages
23794-23794
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2322911088
Cited by
65
References
86
Citations by year
2026: 3 · 2025: 5 · 2024: 8 · 2023: 9 · 2022: 4 · 2021: 3 · 2020: 9 · 2019: 7 · 2018: 7 · 2017: 7 · 2016: 3
FWCI
8.50
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs (I01 BX003050, I01 RX000444, RX000444, C06 RR015455)
  • Research to Prevent Blindness
  • Alexion Pharmaceuticals
  • Medical University of South Carolina (C06 RR015455)
  • National Institutes of Health (1c06rr015455-01a1)
  • National Eye Institute (R01EY019320, R01EY024581)
  • National Center for Research Resources (C06 RR-015455)
Topics
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Health Sciences › Medicine › Ophthalmology › Ocular Diseases and Behçet’s Syndrome
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
Keywords
choroidal neovascularization, neovascular age-related macular degeneration, C5a, anaphylatoxins, γδ T cells, Th17 cells, IL-17, innate-adaptive immune crosstalk, ocular inflammation, ARPE-19 cells, laser photocoagulation
MeSH terms
Animals, Cell Line, Cell Movement, Choroid, Humans, Immunity, Innate, Injections, Intravenous, Light Coagulation, Mice, Inbred C57BL, Spleen, Gene Expression, Complement C5a, Receptors, Antigen, T-Cell, gamma-delta, CD8-Positive T-Lymphocytes, Choroidal Neovascularization, Interleukin-17, Receptor, Anaphylatoxin C5a, Mice, Retinal Pigment Epithelium, Adaptive Immunity, Antibodies, Neutralizing, Th17 Cells

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