A quantitative method to measure islet cell surface antibodies in human patients has been developed using 125l-protein A. Isolated, dispersed, viable rat islet cells prepared by collagenase digestion were fixed in 4% paraformaldehyde to allow storage for up to 7 wk at 4°C. Human sera, heat inactivated and adsorbed with rat liver and kidney powder (100 mg/ml), were incubated with the fixed cells (50 × 103) for 60 min at 37° C. Thereafter the cells were washed and exposed to 5 × 105 cpm 125I-protein A, which binds to IgG attached to the cell surface. Assay precision (14%) and reproducibility (16%) were established by repeated analysis of pooled sera from healthy individuals and IDDM patients using pooled batches of islet cells. Using this method, islet cell surface antibodies were detected in 35% of insulin-dependent diabetic patients.
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Articles| May 01 1983
Quantitative Determination of Islet Cell Surface Antibodies Using 125I-Protein A
A H -J Huen;
Address reprint requests to Dr. Arthur H. Rubenstein, Department of Medicine, University of Chicago, 950 East 59th Street, Chicago, Illinois 60637.
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A H -J Huen, M Haneda, Z Freedman, A Lernmark, A H Rubenstein; Quantitative Determination of Islet Cell Surface Antibodies Using 125I-Protein A. Diabetes 1 May 1983; 32 (5): 460–465. https://doi.org/10.2337/diab.32.5.460
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