title: Unique surface phenotype of T cells in lymphoproliferative autoimmune MRL/Mp-lpr/lpr mice.
abstract: MRL/l mice, which carry the mutant gene lpr, develop massive T cell lymphoproliferation and an autoimmune syndrome. The surface antigen profile of MRL/l lymphocytes was analyzed with rat monoclonal antibodies. They included YE1/9.9, anti-transferrin receptor; YE1/7.1, which reacts with a population of proliferating immature T cells; and YE1/19.1, a newly identified antibody reactive with a surface antigen on EL-4 cells, which consists of two disulfide-bonded polypeptide chains, each of 115,000 m.w. Flow cytometric analysis of lymphocytes from the enlarged lymph nodes of MRL/1 mice showed the majority of them to be Lyt-1+, YE1/7.1+, YE1/19.1+, YE1/9.9-. In contrast, YE1/7.1 and YE1/19.1 antibodies did not significantly react with lymphocytes from the congenic MRL/n mice, which lack the lpr gene and do not develop lymphoproliferation. Lymphocytes from younger MRL/l mice, which have almost normal size lymph nodes, were also YE1/7.1-, YE1/19.1-. A small proportion of mitogen-stimulated MRL/n lymph node cells appeared to express these antigens at low densities, but it is not known whether they represent a unique cell population. Among the several lymphoid cell lines tested, only the T lymphoma line EL-4 had the Lyt-1+, YE1/7.1+, YE1/19.1+ phenotype. These results suggest that the lpr mutation induces the expansion of a unique T cell subset.
mesh_terms: D000375:Aging; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000937:Antigen-Antibody Reactions; D000954:Antigens, Surface / Q000032:analysis*; D001327:Autoimmune Diseases / Q000276:immunology*; D002460:Cell Line; D008198:Lymph Nodes / Q000166:cytology; D008213:Lymphocyte Activation; D051379:Mice; D008817:Mice, Mutant Strains / Q000276:immunology*; D010641:Phenotype; D051381:Rats; D011916:Rats, Inbred F344; D013601:T-Lymphocytes / Q000145:classification* / Q000276:immunology / Q000502:physiology
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface