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. 1994 Nov 1;303(Pt 3):731–736. doi: 10.1042/bj3030731

Cloning and initial characterization of the promoter region of the rat cysteine-rich intestinal protein gene.

C W Levenson 1, N F Shay 1, R J Cousins 1
PMCID: PMC1137607  PMID: 7980439

Abstract

Cysteine-rich intestinal protein (CRIP) is an intestinal Zn(2+)-binding protein containing a single copy of the double Zn(2+)-finger arrangement known as the LIM motif. CRIP is developmentally regulated and can be induced by glucocorticoid hormones during the early suckling period. In this report we show that CRIP mRNA levels are induced by dexamethasone in cultured rat intestinal epithelial cells (IEC-6). Analysis of the 2644 bp of the 5'-flanking region of the CRIP gene revealed that the CRIP promoter lacks classical CAAT and TATA boxes but contains GC-rich regions in the proximal end of the promoter that probably function in transcription initiation. In addition to binding sites for transcription factors such as Sp-1, AP-2, OCT and GATA-2, there are multiple glucocorticoid-response elements. CRIP promoter constructs fused to the chloramphenicol acetyltransferase reporter gene and transfected into IEC-6 cells confirmed glucocorticoid responsiveness and the presence of negative acting elements. Mobility-shift assays revealed the presence of nuclear factors that bind to the CRIP promoter as a result of dexamethasone treatment. These experiments provide the initial data required to explore further the regulation of this tissue-specific developmentally regulated Zn(2+)-finger protein.

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Selected References

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