title: Independent control of the expression of several membrane-associated antigens of murine leukemia cells: metabolism and response to specific antiserum.
abstract: The effect of specific antisera on the metabolic rates of thymus-leukemia (TL), H-2a, and tumor-associated antigens of ASL-1 and RADA-1 cells, two murine leukemia cell lines, were determined. The metabolic half-life of each antigen was distinct from the others examined. The half-life of TL antigens was 18 hr; in cells exposed to TL antiserum, it changed to 9 hr. In RADA-1 cells, the half-life of TL antigens was 16 hr; in the presence of TL antiserum it became 4 hr. The half-lives of H-2a antigens and the tumor-associated antigen were unaffected by specific antiserum. Somatic hybrids of ASL-1 or RADA-1 cells were formed with LM(TK)-cells, a thymidine kinase deficient mutant of mouse L cells. Hybrid cells formed TL antigens, but unlike their parental cells their half-life of expression, approximately 30 hr, was unaffected by TL antiserum. Hybrid cells failed to undergo antigenic modulation under conditions more stringent than required to stimulate the modulation of ASL-1 or RADA-1 cells. The hybrids formed the tumor-associated antigen of their murine leukemia parental cells; however, the metabolic rate of the tumor antigen in hybrid cells was defferent than the metabolic rate of the analogous antigen in parental cells. Hybrid cells formed H-2 antigens of both parental sources, and possessed a hybrid karyotype. The half-life of H-2 antigens, approximately 26 hr, was the same both in parental and hybrid cells. H-2a antiserum had no detectable effect upon the metabolism of TL antigens in hybrid or parental cells; nor did TL antiserum have an effect upon the metabolism of H-2a antigens.
mesh_terms: D000818:Animals; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D002459:Cell Fusion; D002460:Cell Line; D002462:Cell Membrane / Q000276:immunology*; D004591:Electrophoresis, Polyacrylamide Gel; D005643:Fucose / Q000378:metabolism; D006680:HLA Antigens; D006822:Hybrid Cells; D007700:Kinetics; D007942:Leukemia, Experimental / Q000276:immunology*; D051379:Mice; D011233:Precipitin Tests
chemical_list: D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D006680:HLA Antigens; D005643:Fucose