Abstract
Immunoperoxidase staining and enzyme-linked immunosorbent assay (ELISA) were used to identify monoclonal antibodies that reacted with pancreatic islet cells. All monoclonal antibodies produced against isolated human or rat pancreatic islets including one mouse autoantibody reacted with pancreatic islets in formalin-fixed pancreas sections, but not with rat kidney or thyroid. Reactivity was also found with suspensions of normal rat islet cells and rat insulinoma cells using a 3-stage immunoperoxidase procedure and an ELISA technique. Differences were observed in staining intensity between the various antigenic substrates tested suggesting variable cross-reactivity and/or number of epitopes. The sensitivity of the immunoperoxidase technique proved to be favourable for identification of monoclonal antibodies that recognize cellular constituents such as islet cell antigens present in low concentrations.
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