Cited by 164Complement system in diseasesRetinal Diseases and TreatmentsOcular Diseases and Behçet’s Syndrome

Complement Component C5a Promotes Expression of IL-22 and IL-17 from Human T Cells and Its Implication in Age-Related Macular Degeneration

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Liu, Baoying, Wei, Lai, Meyerle, Catherine, Tuo, Jingsheng, Sen, H Nida, Li, Zhiyu, Chakrabarty, Sagarika, Agron, Elvira +5 more·2011·Journal of Translational Medicine

Abstract

Background: Age related macular degeneration (AMD) is the leading cause of irreversible blindness in elderly populations worldwide. Inflammation, among many factors, has been suggested to play an important role in AMD pathogenesis. Recent studies have demonstrated a strong genetic association between AMD and complement factor H (CFH), the down-regulatory factor of complement activation. Elevated levels of complement activating molecules including complement component 5a (C5a) have been found in the serum of AMD patients. Our aim is to study whether C5a can impact human T cells and its implication in AMD. Methods: Human peripheral blood mononuclear cells (PBMCs) were isolated from the blood of exudative form of AMD patients using a Ficoll gradient centrifugation protocol. Intracellular staining and enzyme-linked immunosorbent assays were used to measure protein expression. Apoptotic cells were detected by staining of cells with the annexin-V and TUNEL technology and analyzed by a FACS Caliber flow cytometer. SNP genotyping was analyzed by TaqMan genotyping assay using the Real-time PCR system 7500. Results: We show that C5a promotes interleukin (IL)-22 and IL-17 expression by human CD4 + T cells. This effect is dependent on B7, IL-1β and IL-6 expression from monocytes. We have also found that C5a could protect human CD4 + cells from undergoing apoptosis. Importantly, consistent with a role of C5a in promoting IL-22 and IL-17 expression, significant elevation in IL-22 and IL-17 levels was found in AMD patients as compared to non-AMD controls. Conclusions: Our results support the notion that C5a may be one of the factors contributing to the elevated serum IL-22 and IL-17 levels in AMD patients. The possible involvement of IL-22 and IL-17 in the inflammation that contributes to AMD may herald a new approach to treat AMD.

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  • Elevated levels of effector T cell IL22 and IL17 cytokines were reported in AMD patients, suggesting an activation of cellular-mediated immunity.

    “Elevated levels of effector T cell IL22 and IL17 cytokines were reported in AMD patients [64,65], suggesting an activation of cellular-mediated immunity.”

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Authors
Liu, B., Wei, L., Meyerle, C., Tuo, J., Sen, H. N., Li, Z., Chakrabarty, S., Agron, E., Chan, C.-C., Klein, M. L., Chew, E., Ferris, F., & Nussenblatt, R. B.
Affiliations
  • National Institutes of Health (US)
  • Oregon Health & Science University (US)
Corresponding author
Nussenblatt, Robert B
Venue
Journal of Translational Medicine
Published
2011-07-15
Volume
9
Issue
1
Pages
1-12
ISSN
1479-5876 (ISSN-L)
OpenAlex
W2132154261
Cited by
164
References
44
Citations by year
2026: 4 · 2025: 7 · 2024: 13 · 2023: 10 · 2022: 11 · 2021: 8 · 2020: 9 · 2019: 4 · 2018: 8 · 2017: 8 · 2016: 14 · 2015: 16 · 2014: 22 · 2013: 20 · 2012: 9
FWCI
7.38
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Translational Medicine (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
National Institutes of Health
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
  • Health Sciences › Medicine › Ophthalmology › Ocular Diseases and Behçet’s Syndrome
Keywords
age-related macular degeneration, IL-22, IL-17, CD4+ T cells, complement activation, complement factor H, B7, IL-1β, interleukin-6, T cell apoptosis, exudative AMD, inflammation
MeSH terms
Interleukin-22, Aged, Aged, 80 and over, Female, Humans, Interleukins, Macular Degeneration, Male, Middle Aged, Monocytes, T-Lymphocytes, Interleukin-6, Complement C5a, Apoptosis, Cytoprotection, Interleukin-17, Interleukin-1beta

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