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Development and validation of a radioligand binding assay to measure insulin specific IgG subclass antibodies in

D Finco-Kent1, A Morrone, M Moxness

  • 1Pfizer Incorporated, Groton, Connecticut 06340, USA. deborah_finco-kent@groton.pfizer.com

Annals of the New York Academy of Sciences
|December 18, 2003
PubMed

The objective was to develop and validate a radioligand binding assay for insulin antibodies (IABs) of the IgG1, IgG2, IgG3, and IgG4 subclasses in human serum. The validation studies focused on determining specificity, capacity, linearity, sensitivity, and precision of each assay. It was seen that our assay for IAB IgG subclasses is specific and has sufficient capacity to measure each of the subclasses in human serum. Moreover, the linear region and limits of detection and quantitation for each assay are clearly determined.

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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or quantified.