M O'Rourke1, U Fearon2, C M Sweeney3, S A Basdeo4, J M Fletcher4, C C Murphy5, M Canavan2. 1. Department of Ophthalmology, Royal College of Surgeons in Ireland, Dublin, Ireland. Electronic address: maorourk@tcd.ie. 2. Molecular Rheumatology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Ireland. 3. Department of Dermatology, St Vincent's University Hospital, Dublin, Ireland. 4. Schools of Biochemistry and Immunology and Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Ireland. 5. Department of Ophthalmology, Royal College of Surgeons in Ireland, Dublin, Ireland.
Abstract
BACKGROUND: Anterior uveitis (AU) is characterised by infiltration of immune cells into the anterior chamber of the eye. Dendritic cells (DC) are professional antigen presenting cells that initiate and promote inflammation. This study aims to characterise DC in AU and to examine the effects of aqueous humor (AqH) on DC maturation and function. METHODS: The frequency and phenotype of AU and healthy control (HC) circulating DC was examined. AU and HC AqH was immunostained and assessed by flow cytometry. The effect of AU and HC AqH on DC activation and maturation was examined and subsequent effects on CD4+ T cell proliferation assessed. RESULTS: AU peripheral blood demonstrated decreased circulating myeloid and plasmacytoid DC. Within AU AqH, three populations of CD45+ cells were significantly enriched compared to HC; DCs (CD11c+ HLA-DR+), neutrophils (CD15+ CD11c+) and T cells (CD4+ and CD8+). A significant increase in IFNγ, IL8 and IL6 was observed in the AU AqH, which was also significantly higher than that of paired serum. AU AqH induced expression of CD40 and CD80 on DC, which resulted in increased T cell proliferation and the production of GM-CSF, IFNγ and TNFα. CONCLUSION: DC are enriched at the site of inflammation in AU. Our data demonstrate an increase in inflammatory mediators in the AU inflamed microenvironment. AU AqH can activate DC, leading to subsequent proliferation and activation of effector T cells. Thus, the AU microenvironment contributes to immune cell responses and intraocular inflammation.
BACKGROUND:Anterior uveitis (AU) is characterised by infiltration of immune cells into the anterior chamber of the eye. Dendritic cells (DC) are professional antigen presenting cells that initiate and promote inflammation. This study aims to characterise DC in AU and to examine the effects of aqueous humor (AqH) on DC maturation and function. METHODS: The frequency and phenotype of AU and healthy control (HC) circulating DC was examined. AU and HC AqH was immunostained and assessed by flow cytometry. The effect of AU and HC AqH on DC activation and maturation was examined and subsequent effects on CD4+ T cell proliferation assessed. RESULTS: AU peripheral blood demonstrated decreased circulating myeloid and plasmacytoid DC. Within AU AqH, three populations of CD45+ cells were significantly enriched compared to HC; DCs (CD11c+ HLA-DR+), neutrophils (CD15+ CD11c+) and T cells (CD4+ and CD8+). A significant increase in IFNγ, IL8 and IL6 was observed in the AU AqH, which was also significantly higher than that of paired serum. AU AqH induced expression of CD40 and CD80 on DC, which resulted in increased T cell proliferation and the production of GM-CSF, IFNγ and TNFα. CONCLUSION: DC are enriched at the site of inflammation in AU. Our data demonstrate an increase in inflammatory mediators in the AU inflamed microenvironment. AU AqH can activate DC, leading to subsequent proliferation and activation of effector T cells. Thus, the AU microenvironment contributes to immune cell responses and intraocular inflammation.
Authors: Fleurieke H Verhagen; Sanne Hiddingh; Rianne Rijken; Aridaman Pandit; Emmerik Leijten; Michel Olde Nordkamp; Ninette H Ten Dam-van Loon; Stefan Nierkens; Saskia M Imhof; Joke H de Boer; Timothy R D J Radstake; Jonas J W Kuiper Journal: Front Immunol Date: 2018-10-31 Impact factor: 7.561
Authors: Jonas J W Kuiper; Fleurieke H Verhagen; Sanne Hiddingh; Roos A W Wennink; Anna M Hansen; Kerry A Casey; Imo E Hoefer; Saskia Haitjema; Julia Drylewicz; Mehmet Yakin; H Nida Sen; Timothy R D J Radstake; Joke H de Boer Journal: Ophthalmol Sci Date: 2022-05-31