title: Physicochemical and morphological characterization of a new allotransplantable mammary carcinoma ascites subline, TA3-St/ticol/-A.
abstract: The TA3-St/ticol ascites cell (I), immunoselected from the strain-specific TA3-St mammary carcinoma ascites cell of the strain A mouse for decreased H-2a antibody-binding capacity, underwent a spontaneous transition in vivo to a new cell line, TA3-St/ticol/-A (II). Line II was more allotransplantable than was the parental line (line I), and its absorptive capacity for anti-H-2a antibody was manyfold less than line I. Disruption of line II cells by lyophilization did not increase the absorptive capacity, in contrast to its marked enhancement in the TA3-Ha ascites cell under similar conditions. An explanation for the enhanced allotransplantability of line II may be related to either a loss of H-2a antigens or altered macromolecular structures at the cell surface: sialic acid, consisting of 93% N-glycolylneuraminic acid for line II and 9% for line I; altered chemical structures of cell surface glycoproteins, particularly a high-molecular-weight glycoprotein present in much greater proportion in line II than in line I; a macromolecular complex released by a protease from line I, but not line II; and I being agglutinable by concanavalin A, but not line II. Electron microscopy showed line II to be more pleomorphic and less rounded than was line I. Under high-resolution electron microscopy, the cell surfaces of both allotransplantable cells, lines II and I, exhibited thin filamentous material, material not observed at the surface of the nonallotransplantable TA3-St ascites cell.
mesh_terms: D000818:Animals; D002460:Cell Line; D005260:Female; D007621:Karyotyping; D008325:Mammary Neoplasms, Experimental / Q000235:genetics / Q000276:immunology* / Q000648:ultrastructure; D051379:Mice; D008809:Mice, Inbred C3H; D008815:Mice, Inbred Strains; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D009368:Neoplasm Transplantation; D012794:Sialic Acids / Q000032:analysis; D013045:Species Specificity; D014184:Transplantation, Homologous
chemical_list: D012794:Sialic Acids