title: Repeated isolation of unique Qa2+ Ia+ clonally derived cell lines from Qa2- mice.
abstract: Qa2+ tumor cell lines were previously isolated from individual BALB/cBy (Qa2-) splenic lymphomas induced by murine sarcoma virus-murine leukemia virus-Moloney (MSV-MuLV-M). Two clonally derived cell lines, ORA I-a and Thorbly, and one noncloned cell line, BOMS, expressed Qa2, but neither Ly-1 nor Ly-2 were detected. In order to determine whether eight cloned and two noncloned tumor cell lines all represented a unique population of transformed cells, the presence of a series of surface differentiation antigens as studied. In addition to Qa2, each cell line examined expressed IAd, IEd, H-2Kd, H-2Dd, and receptors for C3b and the Fc portion of immunoglobulin (Ig). Neither Thy-1.2 nor Ig were detected on the cell surfaces, and cytoplasmic Ig was not precipitated from metabolically radiolabeled and detergent-solubilized cell extracts. However, monocyte specific alpha-napththyl acetate esterase-containing granules were present in all cell lines examined. Therefore, a unique Qa2+ monocytic cell is repeatedly isolated after chronic MSV-MuLV-M infection. Further analysis of these cells may provide insight into both the regulation of Qa2 expression and the interactions between monocytes and lymphocytes during leukemogenesis.
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000276:immunology; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology; D002454:Cell Differentiation; D002460:Cell Line; D002469:Cell Separation; D002999:Clone Cells / Q000276:immunology; D005260:Female; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D008214:Lymphocytes / Q000166:cytology / Q000276:immunology*; D008223:Lymphoma / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010641:Phenotype; D011817:Rabbits; D011951:Receptors, Complement; D011961:Receptors, Fc; D012513:Sarcoma, Experimental / Q000276:immunology; D013601:T-Lymphocytes / Q000145:classification / Q000166:cytology / Q000276:immunology
chemical_list: D000950:Antigens, Ly; D000949:Histocompatibility Antigens Class II; D011951:Receptors, Complement; D011961:Receptors, Fc