Immunohistochemical demonstration of estrophilin in mouse tissues using a biotinylated monoclonal antibody.

We have developed a direct avidin-biotin-peroxidase complex (ABC) immunohistochemical method for localization of estrophilin in mouse tissues. The method has been found especially useful for microscopic demonstration of the receptor in mouse liver, since the indirect alternative, autoradiography after injection of radiolabeled estrogens, is of no value in this organ. The ABC technique employs a biotinylated monoclonal antibody to human estrophilin (Abbot H222) which was previously shown to crossreact with the murine receptor. Cryostat-cut tissue sections which were briefly fixed were incubated with the modified antibody, and the estrophilin was revealed by subsequent exposure to ABC followed by H2O2/diaminobenzidine.