title: Immunological activity of a T hybrid line. I. Production of an H-2-related suppressor factor with specificity for sheep red blood cells.
abstract: T lymphocyte hybrid lines have been produced by fusion of the thymoma BW 5147 with spleen cells of C57BL/10 mice primed to sheep red blood cells (SRBC). The supernatant (culture fluid) of a T hybrid designated A 1 was able to suppress the primary (IgM) and secondary (IgM and IgG) antibody responses to SRBC in vitro. The suppressive activity of supernatants could be titrated to 50% end points at final dilutions of up to 1 : 270. The suppression affected only SRBC and haptens coupled to SRBC, except when used at high concentration when some nonspecific suppression was observed. Absorption of the A 1 supernatant with SRBC removed all activity, while several other species of red cells failed to do so. The suppressor factor present in A 1 supernatant was not removed by anti-Ig adsorbents, but was removed by anti-H-2 antibodies reacting specifically with the haplotype of the spleen cells used in the fusion (H-2b). The cellular target of action of the factor was apparently a B cell, based on absorption with different cell populations. No genetic restrictions in the activity of the factor were found. A 1 cells carried H-2 and Thy-1 alleles of both parental cells and formed rosettes with SRBC.
mesh_terms: D000042:Absorption; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D002455:Cell Division; D000939:Epitopes; D004912:Erythrocytes / Q000276:immunology*; D006183:H-2 Antigens / Q000235:genetics / Q000276:immunology*; D006822:Hybrid Cells / Q000276:immunology*; D007621:Karyotyping; D051379:Mice; D008806:Mice, Inbred AKR; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008934:Mitogens / Q000494:pharmacology; D011947:Receptors, Antigen, B-Cell / Q000276:immunology; D012397:Rosette Formation; D012756:Sheep; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors
chemical_list: D000939:Epitopes; D006183:H-2 Antigens; D008934:Mitogens; D011947:Receptors, Antigen, B-Cell