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. 1995 Oct 16;14(20):5060–5072. doi: 10.1002/j.1460-2075.1995.tb00188.x

In vivo regulation of interleukin-2 receptor alpha gene transcription by the coordinated binding of constitutive and inducible factors in human primary T cells.

M Algarté 1, P Lécine 1, R Costello 1, A Plet 1, D Olive 1, J Imbert 1
PMCID: PMC394609  PMID: 7588634

Abstract

IL-2R alpha transcription is developmentally restricted to T cells and physiologically dependent on specific stimuli such as antigen recognition. To analyse the mechanisms used to activate IL-2R alpha transcription as well as those used to block it in non-expressing cells, we determined the protein-DNA interactions at the IL-2R alpha locus in three different cell types using the DMS/LMPCR genomic footprinting method. CD25/IL-2R alpha can be efficiently induced in primary human T cells since approximately 100% express this gene when receiving an appropriate combination of mitogenic stimuli. To understand why IL-2R alpha is not expressed in other haematopoietic cell types, we analysed BJAB B lymphoma cells which do not express the IL-2R alpha gene and contain constitutively active nuclear NF-kappa B. Primary fibroblasts from embryo and adult skin were selected to examine the mechanisms that may be used to keep the IL-2R alpha gene inactive in non-haematopoietic cells. The three main results are: (i) the stable in vivo occupancy of IL-2R alpha kappa B element in resting T cells, most probably by constitutive NF-kappa B p50 homodimer that could impair SRF binding to the flanking SRE/CArG box; (ii) its inducible occupancy by NF-kappa B p50-p65 associated with the binding of an SRE/CArG box DNA-binding factor upon mitogenic stimulation; and (iii) a correlation between the precommitment of T cells to activation and the presence of stable preassembled protein-DNA complexes in contrast with the bare IL-2R alpha locus in non-T cells.

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