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Titolo:
THE OPPOSING EFFECTS OF RETINOIC ACID AND PHORBOL ESTERS CONVERGE TO A COMMON RESPONSE ELEMENT IN THE PROMOTER OF THE RAT CHOLESTEROL 7-ALPHA-HYDROXYLASE GENE (CYP7A)
Autore:
CRESTANI M; SADEGHPOUR A; STROUP D; GALLI G; CHIANG JYL;
Indirizzi:
NE OHIO UNIV,COLL MED,DEPT BIOCHEM & MOL PATHOL,POB 95 ROOTSTOWN OH 44272 NE OHIO UNIV,COLL MED,DEPT BIOCHEM & MOL PATHOL ROOTSTOWN OH 44272 UNIV MILAN,FAC FARM,IST SCI FARMACOL I-20133 MILAN ITALY
Titolo Testata:
Biochemical and biophysical research communications
fascicolo: 2, volume: 225, anno: 1996,
pagine: 585 - 592
SICI:
0006-291X(1996)225:2<585:TOEORA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROTEIN-KINASE-C; BILE-ACIDS; MESSENGER-RNA; HORMONAL-REGULATION; RECEPTORS; TRANSCRIPTION; EXPRESSION; BINDING; LIVER; FOS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
M. Crestani et al., "THE OPPOSING EFFECTS OF RETINOIC ACID AND PHORBOL ESTERS CONVERGE TO A COMMON RESPONSE ELEMENT IN THE PROMOTER OF THE RAT CHOLESTEROL 7-ALPHA-HYDROXYLASE GENE (CYP7A)", Biochemical and biophysical research communications, 225(2), 1996, pp. 585-592

Abstract

The activity of the rat CYP7A/luciferase reporter gene was increased five-fold by all-trans retinoic acid (atRA) or 9-cis retinoic acid (9cRA) in transient transfection assay in HepG2 cells. Cotransfection with retinoid X receptor (RXR) stimulated the promoter activity in the absence of ligand. however, addition of atRA inhibited the transcriptional activity. Cotransfection with retinoic acid receptor (RAR) did not have much effect on CYP7A promoter activity. The CYP7A promoter, when linked upstream to the SV40/luciferase reporter gene, strongly repressed the phorbol 12-myristate 13-acetate (PMA)-stimulated SV40/luciferase reporter gene activity. The regions conferring the effects of RA andPMA were mapped to nt - 176/-117 and nt - 148/-129, respectively. Several direct repeats of hormone response element (AGTTCA) in this region are required for RA response. AP-1 like sequences are located withinthe region responding to both RA and PMA. Site-directed mutagenesis of the AP-1 site abolished the effects of both RA and phorbol esters. Retinoic acid effect was antagonized by PMA. Moreover, cotransfection of Fos and Jun expression vectors blunted the stimulatory effect of retinoic acid on the CYP7A/luciferase gene activity. Therefore, effects of two different signal transduction pathways converge to a common response element. This regulatory cross-talk may be involved in bile acid repression and regulates CYP7 gene transcription in the liver. (C) 1996 Academic Press, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/10/20 alle ore 05:16:48