Abstract |
The retinoic acid (RA) receptor ( RAR) beta 2 promoter is strongly activated by RA in embryonal carcinoma (EC) cells. We examined this activation in the P19 EC-derived END-2 cell line and in E1A-expressing counterparts and found strong RA-dependent RAR beta 2 promoter activation in the E1A-expressing cells, which was not observed in the parental cell line, indicating a possible role for E1A in RAR beta 2 activation. In transient transfection assays, E1A functioned as a coactivator of RA-dependent RAR beta 2 promoter activation and, moreover, was able to restore this activation in cells lacking RAR beta 2 activation. By deletion analysis, two regions in the RAR beta 2 promoter were identified that mediate the stimulatory effect of E1A: the RA response element and TATA box-containing region and a more up-stream region between -180 and -63, in which a cAMP response element-related motif was identified as a target element for E1A. In addition, determination of endogenous E1A-like activity by measuring E2A promoter activity in transient transfection assays in EC and differentiated cells revealed a correlation between RA-dependent RAR beta 2 promoter activation and the presence of this activity, suggesting an important role for the cellular equivalent of E1A in regulation of the RAR beta 2 promoter.
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Authors | F A Kruyt, G E Folkers, A J Walhout, B J van der Leede, P T van der Saag |
Journal | Molecular endocrinology (Baltimore, Md.)
(Mol Endocrinol)
Vol. 7
Issue 4
Pg. 604-15
(Apr 1993)
ISSN: 0888-8809 [Print] United States |
PMID | 8389000
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Adenovirus E1A Proteins
- Carrier Proteins
- Cyclic AMP Response Element-Binding Protein
- Receptors, Retinoic Acid
- Recombinant Fusion Proteins
- Tretinoin
- Chloramphenicol O-Acetyltransferase
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Topics |
- Adenovirus E1A Proteins
(genetics, pharmacology, physiology)
- Animals
- Base Sequence
- Binding Sites
- Carrier Proteins
(genetics)
- Chloramphenicol O-Acetyltransferase
(genetics)
- Cyclic AMP Response Element-Binding Protein
(metabolism)
- Embryonal Carcinoma Stem Cells
- Gene Expression
- Mice
- Molecular Sequence Data
- Neoplastic Stem Cells
- Promoter Regions, Genetic
- Receptors, Retinoic Acid
- Recombinant Fusion Proteins
- Transfection
- Tretinoin
(pharmacology)
- Tumor Cells, Cultured
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