Unusual expression of IL 2 receptors and both the c-myb and c-raf oncogenes in T cell lines and clones derived from autoimmune MRL-lpr/lpr mice.
Concomitant with their disease, autoimmune MRL-lpr/lpr mice develop a profound lymphadenopathy composed of an unusual dull Lyt-1+ population of T cells. To examine the unusual growth properties and origin of these T cells, as well as their potential role in disease, very rapidly growing T cell lines and clones have been developed from cultures of MRL-lpr/lpr spleen and LN cells. These were studied for growth receptors, oncogene expression, and surface markers. The results further demonstrate the unique nature of lpr-derived T cells and show that i) all lines and clones exhibit greatly elevated expression of both the c-myb and the c-raf oncogenes, ii) despite the reported defect in IL 2 receptor expression of mitogen-activated fresh MRL-lpr/lpr T cells, all long-term lines or clones bear large numbers of IL 2 receptors continuously and without stimulation, although iii) unlike slower growing IL 2-dependent lines from MRL-lpr/lpr mice, these rapidly growing lines and clones are poorly inhibited by anti-IL 2 receptor antibody. Such IL 2 receptor-bearing, nontransformed T cells that are easily maintained have been useful in growth factor studies.
D000818:Animals; D000954:Antigens, Surface / Q000032:analysis; D001327:Autoimmune Diseases / Q000235:genetics / Q000276:immunology*; D002460:Cell Line; D002999:Clone Cells / Q000276:immunology / Q000378:metabolism; D008213:Lymphocyte Activation; D051379:Mice; D008817:Mice, Mutant Strains / Q000235:genetics / Q000276:immunology*; D009857:Oncogenes; D010641:Phenotype; D011971:Receptors, Immunologic / Q000032:analysis*; D015375:Receptors, Interleukin-2; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology / Q000378:metabolism*
D000954:Antigens, Surface; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2