Quantitative determination of islet cell surface antibodies using 125I-protein A

Research output: Contribution to journalArticle


A quantitative method to measure islet cell surface antibodies in human patients has been developed using 125I-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 x 103) for 60 min at 37°C. Thereafter the cells were washed and exposed to 5 x 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.


  • A. H.J. Huen
  • M. Haneda
  • Z. Freedman
  • A. Lernmark
  • A. H. Rubenstein
External organisations
  • University of Chicago
  • Hagedorn Research Institute
Original languageEnglish
Pages (from-to)460-465
Number of pages6
Issue number5 I
Publication statusPublished - 1983 Jun 16
Publication categoryResearch
Externally publishedYes