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. 1991 May 11;19(9):2303–2308. doi: 10.1093/nar/19.9.2303

A cell-type specific and enhancer-dependent silencer in the regulation of the expression of the human urokinase plasminogen activator gene.

R Cannio 1, P S Rennie 1, F Blasi 1
PMCID: PMC329434  PMID: 1710352

Abstract

A transcriptional silencer has been identified in the 5' regulatory region of the human urokinase plasminogen activator (uPA) gene. This region is able to block transcription from the human u-PA as well as the rabbit beta-globin promoters in a cell type specific and orientation independent way. The silencer is enhancer dependent and is active in two cell lines (HeLa and CV-1) which produce little if any uPA, but not in the high uPA producer PC3. Silencing activity and enhancer dependence can be separated: the silencing activity has been localized to the DNA fragment -660 to -536, while the enhancer dependence is located in the -536 to -308 fragment. The DNA sequence of the silencer region contains an element that closely resembles the TGF-beta responsive negative element TIE.

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Selected References

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