title: NF-kappa B subunit regulation in nontransformed CD4+ T lymphocytes.
abstract: Regulation of interleukin-2 (IL-2) gene expression by the p50 and p65 subunits of the DNA binding protein NF-kappa B was studied in nontransformed CD4+ T lymphocyte clones. A homodimeric complex of the NF-kappa B p50 subunit was found in resting T cells. The amount of p50-p50 complex decreased after full antigenic stimulation, whereas the amount of the NF-kappa B p50-p65 heterodimer was increased. Increased expression of the IL-2 gene and activity of the IL-2 kappa B DNA binding site correlated with a decrease in the p50-p50 complex. Overexpression of p50 repressed IL-2 promoter expression. The switch from p50-p50 to p50-p65 complexes depended on a protein that caused sequestration of the p50-p50 complex in the nucleus.
authors.affiliation: Laboratory of Immunology, National Institute for Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.
authors.forename: S M
authors.initials: SM
authors.lastname: Kang
authors.forename: A C
authors.initials: AC
authors.lastname: Tran
authors.forename: M
authors.initials: M
authors.lastname: Grilli
authors.forename: M J
authors.initials: MJ
authors.lastname: Lenardo
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D015704:CD4 Antigens / Q000276:immunology*; D002460:Cell Line; D002467:Cell Nucleus / Q000502:physiology; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics / Q000378:metabolism; D002999:Clone Cells; D010856:Columbidae; D004247:DNA / Q000235:genetics; D005786:Gene Expression Regulation; D007376:Interleukin-2 / Q000235:genetics*; D046911:Macromolecular Substances; D051379:Mice; D008969:Molecular Sequence Data; D016328:NF-kappa B / Q000378:metabolism*; D015345:Oligonucleotide Probes; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D015704:CD4 Antigens; D007376:Interleukin-2; D046911:Macromolecular Substances; D016328:NF-kappa B; D015345:Oligonucleotide Probes; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D014409:Tumor Necrosis Factor-alpha; D004247:DNA; D015500:Chloramphenicol O-Acetyltransferase