Cellular cytotoxicity to membrane-associated insulin in an autologous system.
A method is described for the measurement of T-cell cytotoxicity to purified preparations of insulin, their high molecular weight fractions and C-peptide derivatives. The technique assesses cellular cytotoxicity to membrane associated insulin in an autologous system. Peripheral blood lymphocytes from 19 type 1 diabetic patients were stimulated in vitro for 6 days with the pharmaceutical preparation(s) used therapeutically. At the end of this period, they were set up in a 4-h cytotoxicity assay against 51Cr labelled PHA blast transformed lymphocytes in the presence of therapeutic insulin, monocomponent insulin, B-component or C-peptide. The results presented here demonstrate cytotoxicity to insulin B-component in diabetic patients who have received pork insulin for 2-6 years. The possible reasons for this finding are discussed.
D000328:Adult; D000920:Antibody-Dependent Cell Cytotoxicity; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology*; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D007330:Insulin Antibodies / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D011972:Receptor, Insulin / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
D007330:Insulin Antibodies; D011972:Receptor, Insulin