title: Alien H-2 antigens on a chemically induced fibrosarcoma: further evidence in crude membrane and soluble extracts of the tumor.
abstract: Crude membranes (CM) were obtained from in vivo subcutaneous nodules of the methylcholanthrene-induced BALB/c fibrosarcoma C-1 by forcing tumor fragments through a mechanical press and subsequent differential centrifugation. This immunogenic tumor has been previously shown to express both H-2d and extra H-2k-like antigens. Original H-2d and alien H-2k antigenic activities were present in CM C-1 as judged by the specific inhibition of the C'-dependent cytotoxicity of monospecific H-2 alloantisera on normal 51Cr-labelled lymphoid cells. Both K- and D-end private H-2d antigens (31 and 4), and H-2d public antigens 8, 29, 35 were detected in CM C-1. In addition, the alien H-2Kk.23 private specificity and the public H-2k.1, 5, and 25 were also found in CM C-1. A weak but reproducible activity attributable to the Dk private antigen 32 was also revealed in this material. A hierarchy in the expression of both H-2d and H-2k specificities was evident in CM C-1 which paralleled, although with an overall lower antigenic activity, those of two other BALB/c (H-2D) FIBROSARCOMAS AND OF A C3Hf (H-2k) lymphoma, respectively. CM from normal BALB/c and C3Hf spleens, while expressing higher amounts of all the tested H-2 antigens, displayed a hierarchy of the different specificities similar to that of neoplastic tissues. Crude soluble (CS) material was obtained from CM C-1 by deoxycholate treatment and was tested in the inhibition assay for the presence of H-2d and alien H-2k antigens. Only specificities with the highest expression in CM were found in CS, i.e. H-2.4 and 29 for H-2d and H-2.25 for H-2k. Both CM and CS from C-1, but not from another control BALB/c sarcoma, were able to significantly inhibit the activity of an oligospecific serum to the Kk-coded antigens.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000276:immunology; D002850:Chromatography, Gel; D003601:Cytotoxicity Tests, Immunologic; D005354:Fibrosarcoma / Q000139:chemically induced / Q000276:immunology* / Q000648:ultrastructure; D006183:H-2 Antigens / Q000032:analysis / Q000302:isolation & purification*; D008228:Lymphoma, Non-Hodgkin / Q000139:chemically induced / Q000276:immunology / Q000648:ultrastructure; D008748:Methylcholanthrene; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D009374:Neoplasms, Experimental / Q000139:chemically induced; D014020:Tissue Extracts; D014520:Urethane
chemical_list: D006183:H-2 Antigens; D014020:Tissue Extracts; D014520:Urethane; D008748:Methylcholanthrene