title: Cell growth cycle block of T cell hybridomas upon activation with antigen.
abstract: Stimulation of antigen-specific T cell hybridomas with the appropriate antigen/MHC combination, at concentrations that resulted in the secretion of the lymphokine interleukin 2, resulted in a dose-dependent decrease in both [3H]thymidine incorporation and cell growth. Flow cytometric studies demonstrated that stimulation with antigen resulted in a cell cycle block that was most evident at the G1/S border, and mixing studies revealed that bystander T cells of different antigen specificities were not affected. For at least the large majority of T cells, the G1/S cell cycle block appeared to be irreversible after 24 h of exposure to antigen. This cell cycle block may be useful as a rapid and quantitative measure of T cell hybridoma activation, as a means of selecting T cell hybridomas that have functional alterations in the reception of stimulatory signals, and may serve as a model of the induction of tolerance in immature T cells.
mesh_terms: D000818:Animals; D000941:Antigens; D002453:Cell Cycle; D004261:DNA Replication; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D006825:Hybridomas / Q000166:cytology*; D007108:Immune Tolerance; D007376:Interleukin-2 / Q000378:metabolism; D008213:Lymphocyte Activation; D051379:Mice; D011948:Receptors, Antigen, T-Cell / Q000502:physiology*; D013601:T-Lymphocytes / Q000166:cytology* / Q000276:immunology
chemical_list: D000941:Antigens; D000949:Histocompatibility Antigens Class II; D007376:Interleukin-2; D011948:Receptors, Antigen, T-Cell