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Mol. Cell. Biol., 03 1995, 1786-1796, Vol 15, No. 3
S John, RB Reeves, JX Lin, R Child, JM Leiden, CB Thompson and WJ Leonard
The interleukin 2 receptor alpha-chain (IL-2R alpha) gene is rapidly and
potently induced in T cells in response to mitogenic stimuli. Previously,
an inducible enhancer between nucleotides -299 and -228 that contains
NF-kappa B and CArG motifs was identified. We now report the
characterization of a second essential positive regulatory element located
between nucleotides -137 and -64 that binds Elf-1 and HMG-I(Y). This
element had maximal activity in lymphoid cells, paralleling the cell type
specificity of Elf-1 expression. Transcription from the IL-2R alpha
promoter was inhibited when either the Elf-1 or the HMG-I(Y) binding site
was mutated. Coexpression of both proteins activated transcription of the
-137 to -64 element in COS-7 cells. Elf-1 physically associated with HMG-I
and with NF-kappa B p50 and c-Rel in vitro, suggesting that protein-protein
interactions might functionally coordinate the actions of the upstream and
downstream positive regulatory elements. This is the first report of a
physical interaction between an Ets family member and NF-kappa B family
proteins. These findings provide significant new insights into the
protein-protein and protein-DNA interactions that regulate
cell-type-specific and inducible IL-2R alpha gene expression and also have
implications for other genes regulated by Elf-1 and NF-kappa B family
proteins.
Regulation of cell-type-specific interleukin-2 receptor alpha-chain gene expression: potential role of physical interactions between Elf-1, HMG-I(Y), and NF-kappa B family proteins
Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, Bethesda, Maryland 20892.
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