Summary
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 stimulatedin 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 against51Cr 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.
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This work was funded by a grant from the Wellcome Foundation.
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Richens, E.R., Seward, M.E. & Groves, R.W. Cellular cytotoxicity to membrane-associated insulin in an autologous system. Acta diabet. lat 22, 55–62 (1985). https://doi.org/10.1007/BF02591093
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DOI: https://doi.org/10.1007/BF02591093