title: Cell-mediated cytotoxic islet cell surface antibodies to human pancreatic beta cells.
abstract: Sera containing islet cell surface antibodies show a complement-dependent cytotoxic reaction against islet cells, but it has not yet been clarified whether islet cell surface antibodies exhibit cell-mediated cytotoxicity to these cells. By 51Cr release assay we investigated whether islet cell surface antibodies showed a cytotoxic reaction to human pancreatic B cells (JHPI-1 clone) in the presence of normal human lymphocytes. The sera from 14 islet cell surface antibody-positive, 16 islet cell surface antibody-negative Type 1 (insulin-dependent) diabetic patients and 18 islet cell surface antibody-negative healthy subjects were studied. Four sera containing islet cell surface antibodies showed specific cytotoxicity above the mean +3SD value of healthy subjects, and the mean specific cytotoxicity of islet cell surface antibody-positive sera differed significantly from that of both islet cell surface antibody-negative groups. These results suggest that this cell-mediated cytotoxic mechanism may play an important role in the pathogenesis of Type 1 diabetes.
mesh_terms: D000293:Adolescent; D000328:Adult; D001323:Autoantibodies / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D003602:Cytotoxicity, Immunologic; D005260:Female; D006801:Humans; D007111:Immunity, Cellular; D007515:Islets of Langerhans / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D011947:Receptors, Antigen, B-Cell / Q000276:immunology*
chemical_list: D001323:Autoantibodies; D011947:Receptors, Antigen, B-Cell