Immunomedics, Inc.

Dan Shochat

Hans J Hansen

Robert Sundoro Wu

A protein containing at least one pendant sulfhydryl group is directly radiolabeled with a radiometal which binds tightly to sulfhydryl groups, using one or more pendant sulfhydryl groups on the protein as endogenous ligands and optionally using an exogenous ligand which binds tightly to the radiometal ion to further stabilize the chelate.

Method for radiolabeling antibody fragments

A protein containing at least one pendant sulfhydryl group is directly radiolabeled with a radiometal which binds tightly to sulfhydryl groups, using one or more pendant sulfhydral groups on the protein as endogenous ligands and optionally using an exogenous ligand which binds tightly to the radiometal ion to further stabilize the chelate.

Method for radiolabeling proteins

A non-enzymatic method of immunohistochemical staining uses a bound electron transfer agent to achieve amplification of antibody binding to specific antigens of interest in a histology or cytology specimen. A preferred embodiment uses a bound phenazine, which is reduced with a soluble reducing agent, and which in turn reduces a tetrazolium salt, to precipitate a formazan dye at the site of primary antibody binding to the antigen of interest. Reagents and kits for use in the method are also provided.

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Maplewood, NJ, United States of America

Dan Shochat