title: Establishment of a natural suppressor cell line producing soluble suppressor factor other than transforming growth factor-beta.
abstract: Natural suppressor (NS) cell line (Clone 59) was established from the bone marrow of adult C3H/Hej mice in the presence of WEHI-3 conditioned media. Clone 59 cells suppressed the generation of cytotoxic T lymphocytes from normal mouse spleen. This suppression was seen at a responder-to-suppressor cell ratio of 1000:1 and lacked antigen specificity or MHC restriction. Clone 59 cells expressed the 'null' surface phenotype (Thy1.2-, CD3-, Lyt-2-, L3T4-, surface Ig-, MAC-1-) by immunofluorescent staining. Clone 59 cells exhibited no cytolytic activity against NK cell-sensitive YAC-1 and natural cytotoxic L929 target cell lines. Non-specific suppression, with a cell-free supernatant from the Clone 59-NS cells, also was observed. The supernatant did not inhibit [3H]-thymidine uptake by CTLL-2 cells which were proliferating in response to IL-2. Anti-transforming growth factor-beta (TGF-beta) monoclonal antibody had no effect on suppression, suggesting that the non-specific suppression is mediated by some soluble factors other than TGF-beta. Clone 59 cells may be useful in identifying non-specific suppressor cells in adult bone marrow and studying their functional role in the regulation of tolerance and self-reactivity.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000276:immunology; D002455:Cell Division / Q000276:immunology; D002474:Cell-Free System; D002999:Clone Cells; D003602:Cytotoxicity, Immunologic / Q000235:genetics; D007694:Killer Cells, Natural / Q000276:immunology; D008213:Lymphocyte Activation; D008285:Major Histocompatibility Complex / Q000276:immunology; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008934:Mitogens / Q000037:antagonists & inhibitors; D013491:Suppressor Factors, Immunologic / Q000096:biosynthesis* / Q000494:pharmacology; D016176:T-Lymphocyte Subsets / Q000378:metabolism*; D013602:T-Lymphocytes, Cytotoxic / Q000166:cytology / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000378:metabolism*; D016212:Transforming Growth Factor beta / Q000096:biosynthesis* / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D008934:Mitogens; D013491:Suppressor Factors, Immunologic; D016212:Transforming Growth Factor beta