title: Immunoreactivity of A103, an antibody to Melan A, in canine steroid-producing tissues and their tumors.
abstract: The monoclonal antibody A103 to the melanocytic differentiation antigen Melan A stains human steroid-producing cells and their tumors. A total of 200 formalin-fixed, paraffin-embedded canine normal tissues and hyperplastic and neoplastic lesions of the adrenal gland, testis, and ovary were immunohistochemically tested for Melan A with antibody A103. Leydig cell tumors (23/23, 100%), Sertoli cell tumors (14/15, 93%), and adrenocortical adenomas (12/13, 92%) were consistently positive. Adrenocortical carcinomas (23/35, 65%) and granulosa cell tumors (10/17, 59%) were less frequently positive. All pheochromocytomas, seminomas, and dysgerminomas were negative. The pattern of staining was cytoplasmic, but nuclear staining was also frequently seen in normal Leydig cells and their tumors. As in human tumors, immunohistochemistry for Melan A stains many canine steroid-producing tumors and can be used to distinguish these tumors from those of nonstereidogenic cells.
authors.affiliation: Veterinary Medical Diagnostic, University of Missouri, Columbia 65211, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Ramos-Vara
authors.forename: M E
authors.initials: ME
authors.lastname: Beissenherz
authors.forename: M A
authors.initials: MA
authors.lastname: Miller
authors.forename: G C
authors.initials: GC
authors.lastname: Johnson
authors.forename: J M
authors.initials: JM
authors.lastname: Kreeger
authors.forename: L W
authors.initials: LW
authors.lastname: Pace
authors.forename: J R
authors.initials: JR
authors.lastname: Turk
authors.forename: S E
authors.initials: SE
authors.lastname: Turnquist
authors.forename: G L
authors.initials: GL
authors.lastname: Watson
authors.forename: B
authors.initials: B
authors.lastname: Yamini
mesh_terms: D000236:Adenoma / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D000310:Adrenal Gland Neoplasms / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D000818:Animals; D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis / Q000276:immunology*; D004285:Dogs; D004407:Dysgerminoma / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D058965:MART-1 Antigen; D008297:Male; D009363:Neoplasm Proteins / Q000032:analysis / Q000276:immunology*; D010051:Ovarian Neoplasms / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D018239:Seminoma / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*; D013736:Testicular Neoplasms / Q000175:diagnosis / Q000276:immunology / Q000662:veterinary*
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D058965:MART-1 Antigen; C548667:MLANA protein, human; D009363:Neoplasm Proteins