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. 1990 Mar;87(5):1830–1834. doi: 10.1073/pnas.87.5.1830

The same target sequences are differentially important for activation of the interleukin 2 receptor alpha-chain gene in two distinct T-cell lines.

M B Toledano 1, D G Roman 1, N F Halden 1, B B Lin 1, W J Leonard 1
PMCID: PMC53577  PMID: 2308942

Abstract

High-affinity receptors for interleukin 2 (IL-2) are expressed on T cells following activation. These receptors are composed of both alpha and beta chains. Expression of alpha chains and, therefore, expression of high-affinity receptors are critically regulated at the level of transcription initiation. We have further dissected the regulatory elements involved in controlling transcription of the IL-2 receptor alpha-chain (IL-2R alpha) gene. The IL-2R alpha promoter contains a kappa B site and binding sites for additional nuclear factors within a 50-base-pair region (positions -290 to -240 relative to the major transcription start site). These include one upstream of the kappa B site and one similar to the c-fos serum response element (SRE), which is downstream of the kappa B site. Mutation of the kappa B site decreases IL-2R alpha promoter activity in MT-2 cells (a T-cell line that has been transformed with human T-cell lymphotropic virus type I), but not in Jurkat cells (a T-cell leukemia line) that have been activated by phorbol 12-myristate 13-acetate (PMA). In contrast, mutation of a region upstream of the kappa B site decreases activity in PMA-induced Jurkat cells but increases activity in MT-2 cells. Mutation of the SRE-like site decreases activity in both cell types but the effect in PMA-induced Jurkat is more pronounced. Thus, these distinct cis-acting elements play different physiological roles in IL-2R alpha gene activation in MT-2 cells and PMA-induced Jurkat T cells. These studies provide direct evidence for a functionally significant SRE-like sequence in a gene other than c-fos and the actin genes and identify other elements that are critical for IL-2R alpha gene expression.

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