title: Immunohistochemical characterization of inflammatory infiltrates in primary biliary cirrhosis.
abstract: Ten liver biopsy specimens from nine patients with PBC stages II to IV were studied immunohistochemically with a broad panel of monoclonal antibodies. In areas of bile-duct proliferation, many BA1+ B-lymphocytes and OKT4+/Leu3a+ helper/inducer T-cells were observed, admixed with some C3b-receptor positive, mono- and polymorphonuclear OKM1+ cells. Numerous IgM-containing plasma cells were seen in portal tracts showing bile-duct proliferation. In contrast, areas of piecemeal necrosis and intralobular spotty necrosis consisted mainly of OKT4+/Leu3a+ helper/inducer, and OKT8+ suppressor/cytotoxic T-cells, admixed with some OKM1+ polymorphonuclear granulocytes. Almost no BA1+ B-lymphocytes or Ig-containing plasma cells were observed in areas of piecemeal necrosis and spotty necrosis. Major histocompatibility complex (MHC)-class I antigens (i.e. HLA-A,B,C) were demonstrated either on the liver cell membrane, or on sinusoidal lining cells. The latter also expressed MHC-class II antigens (i.e. HLA-DR). In two liver biopsies, an increased expression of HLA antigens was observed near areas of piecemeal and spotty necrosis. Our results indicate that several immune mechanisms each with a particular topographical distribution, are operative in PBC. Inflammatory cells, involved in humoral immunity, are present mainly in areas of bile duct proliferation. In contrast, the effector cells of antigen-specific cellular cytotoxicity are present in areas of piecemeal necrosis and spotty necrosis. In the latter areas, a pronounced expression of MHC products representing the afferent limb of the cell-mediated immune response, may permit an optimal T-cell-mediated immune effect or, eventually, result in adverse effects.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D005260:Female; D006651:Histocytochemistry; D006801:Humans; D007111:Immunity, Cellular; D007120:Immunochemistry; D008105:Liver Cirrhosis, Biliary / Q000276:immunology* / Q000473:pathology; D008297:Male; D009336:Necrosis / Q000276:immunology; D013601:T-Lymphocytes / Q000145:classification
chemical_list: D000911:Antibodies, Monoclonal