title: Distribution of antigens detected with MB1, MB2 and MB3 on non-hematopoietic human organs and various tumors.
abstract: We have examined the distribution of antigens detected by MB1, MB2 and MB3 on non-hematopoietic normal human tissues and various types of benign and malignant tumors. MB1 and MB2 reacted with various organs, such as the epithelium of various glands, smooth muscle cells, vascular endothelial cells, and peripheral nerve tissue. The distributions of these two antibodies were essentially identical. Reactivity with MB3 was confined to the ductal epithelium of salivary glands, the pancreas, and sweat glands, and the cortex of the adrenal gland. Immunoblotting analysis demonstrated that MB1 and MB2 reacted with a few bands of an extract of myometrial cytoskeletal fraction and salivary gland cytosol fraction, whereas MB3 failed to show any bands on these materials. The reactivities of MB1 and MB2 with various neoplasms were similar to those in normal organs, with slight variations of staining pattern and preponderance in well differentiated tumors. Exceptionally, carcinoid tumor and small round cell tumors, such as small cell carcinoma or neuroblastoma, were not reactive with MB1 and MB2. MB3 reacted with several cases of well differentiated benign and malignant epithelial tumors in various organs, and exceptional cases of malignant schwannoma and glioma. These results indicate that the antigens detected by MB1 and MB2 are distributed broadly on non-hematopoietic normal organs, whereas those detected by MB3 are confined to exceptional cases of epithelial and non-epithelial tumors. Thus, although the use of MB1, MB2 and MB3 is of little value for differential diagnosis of various tumors, these three antibodies may be useful for determining of the origin of some tumor types.
authors.affiliation: Second Department of Pathology, Niigata University School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Fukuda
authors.forename: Y
authors.initials: Y
authors.lastname: Ohnishi
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa
authors.forename: T
authors.initials: T
authors.lastname: Kakihara
authors.forename: H
authors.initials: H
authors.lastname: Usuda
mesh_terms: D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation / Q000032:analysis*; D001402:B-Lymphocytes / Q000276:immunology*; D014408:Biomarkers, Tumor / Q000032:analysis* / Q000276:immunology; D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry; D009369:Neoplasms / Q000737:chemistry* / Q000473:pathology; D009928:Organ Specificity
chemical_list: D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation; D014408:Biomarkers, Tumor