Regulation of human glutathione S-transferase pi gene transcription: influence of 5'-flanking sequences and trans-activating factors which recognize AP-1-binding sites

Gene
C S MorrowK H Cowan

Abstract

To investigate the transcriptional regulation of human glutathione S-transferase pi (GST pi) gene expression, we fused the GST pi promoter, including 2203 bp of the 5'-flanking region, exon 1, and most of intron 1, to the chloramphenicol acetyltransferase (CAT)-encoding reporter gene (cat). When transfected into human cell lines, this GST-cat construct (-2203 GST-cat) supported high level cat gene expression. RNase-protection and primer-extension experiments showed that the normal GST pi transcriptional start point (tsp) is utilized, and furthermore, that intron 1 is faithfully removed by splicing from the majority of primary GST-cat transcripts. A series of constructs containing deletions in the GST pi sequences of the -2203 GST-cat vector were prepared to define potential regulatory regions. Transfection of these deletion plasmids revealed that a region between GST pi sequences -80 and -8 is absolutely required for cat expression. Furthermore, transfection of the -2203 GST-cat and deletion vectors into two human cell lines--one line which does not produce endogenous GST pi (HeLa cells) and one which produces high levels of endogenous GST pi (HS 578T cells)--failed to identify sequences that differentially influence the level ...Continue Reading

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Jan 1, 1993·Cytotechnology·J A Moscow, K H Dixon
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