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. 1990 Nov;10(11):5655–5662. doi: 10.1128/mcb.10.11.5655

Transcriptional activation of the human cytotoxic serine protease gene CSP-B in T lymphocytes.

R D Hanson 1, T J Ley 1
PMCID: PMC361328  PMID: 2233710

Abstract

The cytotoxic serine protease B (CSP-B) gene is activated during cytotoxic T-lymphocyte maturation. In this report, we demonstrate that the PEER T-cell line (bearing gamma/delta T-cell receptors) accumulates CSP-B mRNA following exposure to 12-O-tetradecanoylphorbol-13-acetate (TPA) and N6-2'-O-dibutyryladenosine 3',5'-cyclic monophosphate (bt2cAMP) because of transcriptional activation of the CSP-B gene. TPA and bt2cAMP act synergistically to induce CSP-B expression, since neither agent alone causes activation of CSP-B transcription or mRNA accumulation. Chromatin upstream from the CSP-B gene is resistant to DNase I digestion in untreated PEER cells, but becomes sensitive following TPA-bt2cAMP treatment. Upon activation of PEER cells, a DNase I-hypersensitive site forms upstream from the CSP-B gene within a region that is highly conserved in the mouse. Transient transfection of CSP-B promoter constructs identified two regulatory regions in the CSP-B 5'-flanking sequence, located at positions -609 to -202 and positions -202 to -80. The region from -615 to -63 is sufficient to activate a heterologous promoter in activated PEER cells, but activation is orientation specific, suggesting that this region behaves as an upstream promoter element rather than a classical enhancer. Consensus AP-1, AP-2, and cAMP response elements are found upstream from the CSP-B gene (as are several T-cell-specific consensus elements), but the roles of these elements in CSP-B gene activation have yet to be determined.

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