title: Unique cell surface phenotypes of proliferating lymphocytes in mice homozygous for lpr and gld mutations, defined by monoclonal antibodies to MRL/Mp-lpr/lpr T cells.
abstract: In mice bearing the autosomal recessive gene of either lpr or gld, generalized T-cell proliferation and autoimmunity occurs. The surface antigen profiles of these proliferating cells were analyzed using two-color flow cytometry analysis with two newly established rat monoclonal antibodies (ALP-1, ALP-2) directed to lpr cells. The Lp-1 antigen, defined by ALP-1, is expressed exclusively on approximately one-half of proliferating lpr and gld lymph node cells. The Lp-2 antigen, like B 220, is expressed on 80-90% of lpr and gld lymph node cells, the cells in B-cell lineage and a small population of Ly-2+ T cells from normal mice. Thus, the lpr and gld lymph node cells were classified into three subsets, Lp-1+/Lp-2+, Lp-1-/Lp-2+ and Lp-1-/Lp-2-. After stimulation with Con A or a combination of IL-2 and phorbol ester, a small population of T cells from normal mice became Lp-1+. The same treatment increased Lp-2+/Ly-2+ and induced Lp-2+/L3T4+ T-cell populations. Therefore, it seems likely that these phenotypically unique T cells are generated at some stage during the proliferation and differentiation of certain normal T-cell subpopulations. The aberrant T cells in mice with lpr and gld mutations may even be normal regulatory T cells, if they are not proliferating abnormally.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000954:Antigens, Surface / Q000235:genetics* / Q000276:immunology; D002455:Cell Division; D005434:Flow Cytometry; D005808:Genes, Recessive; D008198:Lymph Nodes / Q000166:cytology; D008214:Lymphocytes / Q000166:cytology / Q000276:immunology; D051379:Mice; D008817:Mice, Mutant Strains / Q000235:genetics*; D010641:Phenotype; D051381:Rats / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface