Diabetes, Vol 34, Issue 3 300-305, Copyright © 1985 by American Diabetes Association
Assay for islet cell antibodies. Protein A--monoclonal antibody method
S Srikanta, A Rabizadeh, MA Omar and GS Eisenbarth
Assays for islet cell antibodies (ICA) are finding increasing application
in clinical diabetology. We have developed a new islet cell antibody assay
system (ICA-pA), whose salient features include: (1) utilization of
fluorescein-conjugated staphylococcal protein A as a standard second-step
reagent, the advantages of this approach being improved "signal"
(islet)/"noise" (acini) ratio due to reduction of interfering background
acinar pancreatic staining, and facilitation of assay standardization
provided by the use of a chemically pure conjugated protein A reagent; (2)
monoclonal antibody counterstaining with rhodamine-conjugated BISL-32 for
the rapid identification of islets in pancreatic sections; and (3)
quantitation of circulating serum ICA by microimmunofluorometric
techniques.