title: Distinct keratin patterns demonstrated by immunoperoxidase staining of adenocarcinomas, carcinoids, and mesotheliomas using polyclonal and monoclonal anti-keratin antibodies.
abstract: The authors assessed whether distinct patterns for keratin could be demonstrated in 10 adenocarcinomas, 10 carcinoids, and 4 mesotheliomas by an immunoperoxidase reaction using 3 polyclonal and 3 monoclonal antibodies to keratin. When color development in diaminobenzidine (DAB) was allowed to proceed for less than 2 minutes, distinct patterns for keratin could be demonstrated using two polyclonal and two monoclonal antibodies; these were plasma membrane and/or web-like in the adenocarcinomas, punctate or crescentic in the carcinoids, and perinuclear in the mesotheliomas consisting of tumor cells with abundant cytoplasm. Immunoelectron microscopy using protein A colloidal gold confirmed these results. When color development in DAB was allowed to proceed for more than 2 minutes, only diffuse staining was seen. The distinct patterns of immunostaining for keratin obtained with the shorter color development were helpful in differentiating adenocarcinomas, carcinoids, and mesotheliomas.
mesh_terms: D000230:Adenocarcinoma / Q000032:analysis* / Q000648:ultrastructure; D000911:Antibodies, Monoclonal / Q000276:immunology; D002276:Carcinoid Tumor / Q000032:analysis* / Q000648:ultrastructure; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D007633:Keratins / Q000032:analysis* / Q000276:immunology; D008654:Mesothelioma / Q000032:analysis* / Q000648:ultrastructure
chemical_list: D000911:Antibodies, Monoclonal; D007633:Keratins