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Journal Article
Research Support, Non-U.S. Gov't
Immunopathology of scleritis.
Ophthalmology 1991 April
Conjunctival and scleral biopsies from 25 patients with necrotizing scleritis and 5 patients with recurrent nonnecrotizing scleritis were studied by histopathologic, immunofluorescence, and immunoperoxidase techniques. Vasculitis with fibrinoid necrosis and neutrophil invasion of the vessel wall was present in 75% of the scleral and 52% of the conjunctival specimens. Vascular immunodeposits were found in 93% of the scleral and 79% of the conjunctival tissue tested by immunofluorescence techniques. A dramatic increase in the number of inflammatory cells over normal controls was detected in both tissues by immunoperoxidase techniques. In the conjunctival epithelium, there were significantly more T-helpers, macrophages, and B cells. In the conjunctival substantia propria, there were significantly more T cells of all types, macrophages, and B cells. Likewise, scleral specimens showed an increase over controls of T cells of all types and macrophages. HLA-DR expression was dramatically increased in both tissues. Immune-complex-mediated vasculitis plays a pivotal role in the pathogenesis of necrotizing scleritis and recurrent nonnecrotizing scleritis. Induced HLA-DR expression on ocular nonimmune cells and T cell controlled responses also may participate.
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