title: Lichen planus: immunologic and morphologic identification of the submucosal infiltrate.
abstract: The purpose of this investigation was to specifically identify T cells, B cells, and histiocytes in the infiltrate typically seen in lichen planus. In frozen tissue sections, AET-treated sheep erythrocytes formed immunologic rosettes with the lymphocytes in the infiltrate, designating them as T cells. Rosette assays with reagent erythrocytes, IgGEA, IgMEA, IgMEAC, and E resulted in nonadherence, indicating a lack of B cells and macrophages, and indirectly implicating them as T cells. Scanning electron microscopy of the cellular infiltrate, in situ, showed that the cells had smooth, nonvillous surfaces. These observations were consistent with a T cell origin and were considered supportive of the immunologic data. The results of this investigation support the hypothesis that lichen planus is a disease mediated by thymus-dependent lymphocytes.
mesh_terms: D003238:Connective Tissue / Q000473:pathology; D006801:Humans; D007073:Immunoglobulin E; D007075:Immunoglobulin M; D008010:Lichen Planus / Q000276:immunology* / Q000473:pathology; D008264:Macrophages / Q000276:immunology; D009059:Mouth Diseases / Q000276:immunology* / Q000473:pathology; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000276:immunology / Q000473:pathology
chemical_list: D007075:Immunoglobulin M; D007073:Immunoglobulin E