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Immunopathology of ocular sarcoidosis

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Summary

Sarcoidosis is a multisystem disease characterized by enhanced immune responses at sites of involvement. To elucidate the immunopathogenesis of ophthalmic lesions, cell infiltrates in biopsies from conjunctiva and other tissues involved (lungs, lymph nodes, skin) were studied in 26 patients with active sarcoidosis in order to define the surface phenotype and the distribution of cells in granulomatous lesions. Biopsy specimens were also stained for detection of immunoglobulins, complement and fibrinogen deposits. The data demonstrate a lymphocytes/macrophages interaction in the central core of granulomatous areas as the crucial event that initiates the maintains the state of inflammation: at all sites of disease activity is present a compartmentalization of T-cells expressing a helper-related phenotype which account for the great majority of infiltrating cells both in the early lesions (aggregate of macrophages surrounded by lymphocytic infiltrate) and in well-organized sarcoid granulomata. The presence of plasma cells and immunoglobulin deposits may represent an epiphenomenon in line with the helper infiltration, suggesting a local hyper-reactivity of the B-cells immune system. This study suggests some immunopathogenetic mechanisms leading to the formation and growth of conjunctival sarcoid granulomata.

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Authors and Affiliations

  1. Department of Ophthalmology, University of Padova, Padova, Italy

    M. R. Angi, F. Forattini & G. De Caro

  2. Department of Pathology, University of Verona, Verona, Italy

    M. Chilosi

  3. Departments of Pneumology, University of Padova, Padova, Italy

    A. Cipriani

  4. Clinical Medicine and Clinical Immunology Branch, University of Padova, Padova, Italy

    G. Semenzato

Authors
  1. M. R. Angi
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  2. F. Forattini
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  3. M. Chilosi
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  4. A. Cipriani
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  5. G. De Caro
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  6. G. Semenzato
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Angi, M.R., Forattini, F., Chilosi, M. et al. Immunopathology of ocular sarcoidosis. Int Ophthalmol 14, 1–11 (1990). https://doi.org/10.1007/BF00131162

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  • DOI: https://doi.org/10.1007/BF00131162

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