Cited by 143Ocular Diseases and Behçet’s SyndromeTGF-β signaling in diseasesRetinal Diseases and Treatments

Thrombospondin Plays a Vital Role in the Immune Privilege of the Eye

Zamiri, Parisa, Masli, Sharmila, Kitaichi, Nobuyoshi, Taylor, Andrew W., Streilein, J. Wayne·2005·Investigative Opthalmology & Visual Science

Abstract

PURPOSE: The role of thrombospondin (TSP)-1 in TGF-beta activation and T-cell suppression was studied in the retinal pigment epithelial (RPE) cells, a monolayer of pigmented cells that line the subretinal space, an immune-privileged site in the eye. METHODS: Posterior eyecups were prepared by excising the anterior segment, lens, and retina from enucleated eyes of C57BL/6, thrombospondin-1 knockout (TSP-1KO), and TGF-beta2 receptor II double-negative (TGF-beta2 RII DN) mice, leaving behind a healthy monolayer of RPE resting on choroid and sclera. Serum-free medium was added to these RPE eyecups, and, after various time intervals, supernatants (SNs) were removed and tested. RESULTS: SNs of an ex vivo culture of RPE cells from C57BL/6 mice were shown to inhibit both antigen and anti-CD3 activation of T cells, partially due to constitutive production of TGF-beta and to the ability of RPE to activate the latent form of TGF-beta. Activation of TGF-beta was entirely dependent on TSP-1, also produced by RPE. SNs of RPE from TSP-1KO mice failed to inhibit T-cell activation. Ovalbumin (OVA)-specific delayed hypersensitivity (DH) was not impaired when OVA was injected either into the subretinal space or into the anterior chamber of TSP-1KO mice before OVA immunization. Moreover, experimental autoimmune uveoretinitis was significantly more intense in eyes of TSP-1KO mice and failed to undergo spontaneous resolution unlike wild-type mice. CONCLUSIONS: Production of both TSP-1 and active TGF-beta by RPE is essential to the creation and maintenance of immune privilege in the subretinal space and that the immune privilege limits the severity and duration of retinal inflammation due to autoimmunity.

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Crossref · 10.1167/iovs.04-0362

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  • Active local or peripheral tolerance can be induced through conversion of T cells to regulatory T cells or apoptosis of infiltrated effector T cells by inhibitory molecules expressed on the retinal pigmented epithelium or resident stromal cells.

    “An active local or peripheral tolerance to prevent runaway immune responses can be induced in some cases through the conversion of T cell to regulatory T cells (Treg) or the apoptosis of infiltrated effector T cells by inhibitory molecules expressed on the retinal pigmented epithelium (RPE) or resident stromal cells [9][10][11].”

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Authors
Zamiri, P., Masli, S., Kitaichi, N., Taylor, A. W., & Streilein, J. W.
Affiliations
Harvard University (US)
Venue
Investigative Opthalmology & Visual Science
Published
2005-03-01
Volume
46
Issue
3
Pages
908
ISSN
  • 0146-0404 (ISSN-L)
  • 1552-5783
OpenAlex
W4240952760
Cited by
143
References
0
Citations by year
2026: 3 · 2025: 6 · 2024: 3 · 2023: 6 · 2022: 2 · 2021: 11 · 2020: 6 · 2019: 7 · 2018: 9 · 2017: 6 · 2016: 5 · 2015: 9 · 2014: 6 · 2013: 7 · 2012: 8
FWCI
5.79
Type
journal article
Language
en
Open access
closed
Locations
  • Investigative Ophthalmology & Visual Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ey009595-13)
  • National Eye Institute (EY-09595, EY10752, EY 05678)
Topics
  • Health Sciences › Medicine › Ophthalmology › Ocular Diseases and Behçet’s Syndrome
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
Keywords
thrombospondin-1, immune privilege, retinal pigment epithelium, TGF-beta activation, T cell suppression, experimental autoimmune uveoretinitis, delayed-type hypersensitivity, ovalbumin, retinal autoimmunity, subretinal space, choroid
MeSH terms
Animals, Autoimmune Diseases, Enzyme-Linked Immunosorbent Assay, Immune System, Interferon-gamma, Lymphocyte Activation, Male, Mice, Inbred C57BL, Pigment Epithelium of Eye, Retinitis, T-Lymphocytes, Uveitis, Transforming Growth Factor beta, Mice, Knockout, Thrombospondin 1, Reverse Transcriptase Polymerase Chain Reaction, Mice, Transforming Growth Factor beta2

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