title: Kinetics of cellular oncogene expression in mouse lymphocytes. I. Expression of c-myc and c-ras-Ha in T lymphocytes induced by various mitogens.
abstract: Murine splenic T lymphocytes display maximal cellular myc gene (c-myc) expression already 3 h after concanavalin A stimulation and subsequent down-regulation before the onset of DNA synthesis. Stimulation by leucoagglutinin in the presence or absence of interleukin 2 leads to only low initial levels of c-myc-specific RNA which, however, increase later on. A similar pattern of c-myc expression is shown by the Lyt-2+ T cell subpopulation stimulated with either concanavalin A or leucoagglutinin in the presence of interleukin 2. Although [3H]thymidine incorporation was identical, the leucoagglutinin-stimulated Lyt-2+ T cells were void of any demonstrable c-myc-specific RNA at 3 h post-stimulation. Thus, the kinetics of c-myc expression in mouse T lymphocytes are not at all uniform, but depend on the mitogen and the subpopulation. In contrast, levels of c-ras-Ha-specific RNA were always low at early times, always increased towards the onset of DNA synthesis and down-regulation was not observed.
mesh_terms: D000373:Agglutinins / Q000494:pharmacology; D000818:Animals; D003208:Concanavalin A / Q000494:pharmacology; D006224:Cricetinae; D005786:Gene Expression Regulation; D007376:Interleukin-2 / Q000494:pharmacology; D007700:Kinetics; D008213:Lymphocyte Activation / Q000187:drug effects; D051379:Mice; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis* / Q000235:genetics; D016271:Proto-Oncogene Proteins c-myc; D016283:Proto-Oncogene Proteins p21(ras); D011519:Proto-Oncogenes; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000373:Agglutinins; D007376:Interleukin-2; D011518:Proto-Oncogene Proteins; D016271:Proto-Oncogene Proteins c-myc; D003208:Concanavalin A; D016283:Proto-Oncogene Proteins p21(ras)