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• W23089728 abstract "T-cell activation gene 3 (TCA3) encodes a beta-chemokine that is transcriptionally regulated in mast cells; the gene has a functional NF-kappaB element at positions -194 to -185. The 5'-flanking region of this gene is also known to have a negative regulatory region between -2057 and -1342. To characterize the negative regulatory elements (NREs), this region was sequenced and then digested by HindIII enzyme into two fragments, NRE-1 (-2057 to -1493) and NRE-2 (-1492 to -1342). Both NRE-1 and NRE-2 in the 5'-3' orientation inhibited chloramphenicol acetyltransferase (CAT)-protein synthesis by a TCA3-CAT construct transfected into mast cells that were then activated. Only NRE-1 inhibited CAT-protein synthesis in the 3'-5' orientation. Further deletion of the 5' region of NRE-1 partially abolished the inhibitory activity. Both NRE-1 and NRE-2 inhibited the activity of a CD20-CAT construct independent of cell activation. Electrophoretic mobility shift assays showed DNA-protein complex formation with subsequences (CCCCCATTCT) of NRE-1 (NRE-1a) and (CCATGA) of NRE-2 (NRE-2b). NRE-1a appears to be novel. NRE-2b is identical with a putative silencer motif in the alphaIIb integrin gene. Site-directed mutagenesis demonstrated that both NRE-1a and NRE-2b are important in the negative regulation of TCA3 promoter activity. In vivo ligation-mediated PCR footprinting of the NRE-2 region revealed protection between -1372 and -1354, which contains NRE-2b. The data thus demonstrate identity of a silencer motif, here termed NRE-2b, in both the alphaIIb integrin gene and the TCA3, and that this silencer region in mast cells is functional both in vivo and in vitro. Further, evidence is presented that the promoter for TCA3 contains a novel silencer motif, termed NRE-1a, characterized by a CT-rich sequence." @default.
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• W23089728 date "1997-04-15" @default.
• W23089728 modified "2023-10-16" @default.
• W23089728 title "Two different negative regulatory elements control the transcription of T-cell activation gene 3 in activated mast cells" @default.
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• W23089728 doi "https://doi.org/10.1042/bj3230511" @default.
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