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• W1592117612 abstract "Dexamethasone treatment of the Jurkat T77 cell clone inhibited the enhancing effect of 12-O-tetradecanoylporbol-13-acetate (TPA) and the calcium ionophore A23187 on the interleukin 2 (IL2) mRNA levels and gene transcription from intact nuclei. Dexamethasone treatment of Jurkat T77 cells inhibited the TPA/A23187-dependent activation of the transcription from the transfected pIL2CAT, containing 600 base pairs of the genomic sequences upstream of the coding region of IL2 gene, including the TPA/calcium responsive cis-regulatory elements and promoter sequences, driving the expression of the chloramphenicol acetyltransferase (CAT) gene. Transfection of either Jurkat T77 cell clone or glucocorticoid-resistant Jurkat cells with a human glucocorticoid receptor cDNA under the transcriptional control of the Rous sarcoma virus long terminal repeat (LTR) (pRShGR alpha) significantly increased or induced, respectively, the dexamethasone-mediated inhibition of the TPA/A23187-dependent expression of pIL2-CAT as well as the enhancing effect on the expression of the cotransfected CAT gene under the control of the mouse mammary tumor virus LTR, as a marker of glucocorticoid receptor action. This suggests a role for the glucocorticoid receptor in mediating the dexamethasone action on IL2 gene expression. To study the cis-regulatory sequence specificity of the dexamethasone-induced interference with the TPA/A23187-mediated T cell activating signals, we studied the effect of the hormone on the regulatory elements contained in the Rous sarcoma virus and human T lymphotropic virus 1 long terminal repeats and the SV40 promoter, which are known to be transcriptionally enhanced by those activating agents. Dexamethasone was unable to interfere with the TPA/A23187-mediated enhancement of these cis-regulatory elements, suggesting that the hormone effect is specific for IL-2 gene sequences. Our data suggest that the dexamethasone-mediated transcriptional inhibition of the IL2 gene is mediated by an interference with the protein kinase C and calcium-mediated trans-activation of the antigen-responsive and T cell-specific elements lying in the 5'-flanking region of the gene." @default.
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• W1592117612 date "1990-06-01" @default.
• W1592117612 modified "2023-10-18" @default.
• W1592117612 title "Transcriptional regulation of the interleukin 2 gene by glucocorticoid hormones. Role of steroid receptor and antigen-responsive 5'-flanking sequences." @default.
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• W1592117612 doi "https://doi.org/10.1016/s0021-9258(19)39040-4" @default.
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