title: Radioimmunoassay of tumour specific transplantation antigen of a chemically induced rat sarcoma: circulating soluble tumour antigen in tumour bearers.
abstract: The tumour specific transplantation antigen (TSTA) from a chemically induced rat sarcoma has been isolated as an electrophoretically homogeneous soluble material by affinity chromatography using a Sepharose bound antibody raised to the tumour in syngeneic rats. The TSTA is specific for the particular tumour used (the MC-1 sarcoma) and does not cross-react with material extracted from other rat sarcomata. In addition, a material with different physicochemical properties which cross-reacted with different sarcomata was also eluted from the antibody column and this may be the previously identified onco-embryonic antigen (OEA1) which is immunogenic in the syngeneic host.The purified TSTA labelled with (125)I was used in a radioimmunoassay which detected soluble TSTA in rats bearing a MC-1 sarcoma. The assay shows that tumour transplantation is associated with a persisting release of soluble antigen into the circulation. This antigenic burden is present continuously and renewed as long as the tumour mass exists.
mesh_terms: D000818:Animals; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm / Q000032:analysis*; D002846:Chromatography, Affinity; D003429:Cross Reactions; D004591:Electrophoresis, Polyacrylamide Gel; D007106:Immune Sera; D007456:Iodine Isotopes; D009368:Neoplasm Transplantation; D011863:Radioimmunoassay; D051381:Rats; D012513:Sarcoma, Experimental / Q000276:immunology*
chemical_list: D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D007106:Immune Sera; D007456:Iodine Isotopes