title: Expression of the photoreceptor-specific S-antigen in human retinoblastoma.
abstract: This work presents an immunofluorescent study of the distribution of the photoreceptor-specific S-antigen in human retinoblastoma, using mouse monoclonal antibodies. Three cases of differentiated retinoblastoma displayed S-antigen immunoreactivity with various patterns of labeling which depended on the degree of differentiation of the area studied. Flexner-Wintersteiner rosettes and fleurettes were labeled only with monoclonal antibody S2D2, whereas undifferentiated areas were labeled with four different anti-S-antigen monoclonal antibodies, including S2D2. On the other hand, the three undifferentiated retinoblastomas did not show any labeling with these antibodies. The presence of S-antigen in differentiated retinoblastoma confirms that the origin of this tumor is from the photoreceptors, but the question remains unanswered for undifferentiated retinoblastoma for which another origin--glial or primitive neuroectodermal cells--may be proposed.
mesh_terms: D000911:Antibodies, Monoclonal; D000941:Antigens / Q000032:analysis / Q000276:immunology*; D019393:Arrestin; D002460:Cell Line; D005134:Eye Neoplasms / Q000276:immunology* / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D006651:Histocytochemistry; D006801:Humans; D010786:Photoreceptor Cells / Q000032:analysis / Q000276:immunology*; D012160:Retina / Q000294:innervation; D012175:Retinoblastoma / Q000276:immunology* / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D000941:Antigens; D019393:Arrestin