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Comparative Study | Journal Article | Research Support, Non-U.S. Gov't

Synergistic activation of retinoic acid (RA)-responsive genes and induction of embryonal carcinoma cell differentiation by an RA receptor alpha (RAR alpha)-, RAR beta-, or RAR gamma-selective ligand in combination with a retinoid X receptor-specific ligand.

B Roy, R Taneja, P Chambon
B Roy
Institut de Génétique et de Biologie Moleculaire et Cellulaire, Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur, Collège de France, Illkirch, France.
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R Taneja
Institut de Génétique et de Biologie Moleculaire et Cellulaire, Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur, Collège de France, Illkirch, France.
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P Chambon
Institut de Génétique et de Biologie Moleculaire et Cellulaire, Centre National de la Recherche Scientifique/Institut National de la Santé et de la Recherche Médicale/Université Louis Pasteur, Collège de France, Illkirch, France.
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DOI: 10.1128/MCB.15.12.6481
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ABSTRACT

Retinoic acid receptor (RAR)-retinoid X receptor (RXR) heterodimers bind to cognate response elements in vitro more efficiently than do RAR or RXR homodimers, and both RAR and RXR partners have been shown to activate various promoters in transiently transfected cells. We have now investigated whether ligand-dependent activation of both heterodimeric partners is involved in induced expression of endogenous RA-responsive genes and in P19 and F9 cell differentiation. On their own, low concentrations of retinoids selective for either RAR alpha, RAR beta, or RAR gamma did not induce or very inefficiently induced the expression of several RA target genes or triggered differentiation. An RXR-specific synthetic retinoid was similarly inefficient at any concentration. In contrast, at the same concentrations, various combinations of RAR (RAR alpha, RAR beta, or RAR gamma) and RXR selective retinoids resulted in synergistic induction of all retinoic acid (RA) target genes examined, as well as in cell differentiation. However, the magnitude of this synergistic activation varied depending on both the RAR-RXR combination and the promoter context of the responsive genes. Promiscuous activation of the three RARs, or concomitant activation of RAR alpha and RAR gamma, at selective retinoid concentrations also resulted in induction of gene expression and cell differentiation. Taken together, our results are consistent with the conclusion that the RAR and RXR partners of RAR-RXR heterodimers can synergistically activate transcription of RA-responsive genes and can induce differentiation of P19 and F9 cells. Our results also indicate that there is a significant degree of functional redundancy between the three RAR types which, however, varies with the nature of the RA target genes.

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Synergistic activation of retinoic acid (RA)-responsive genes and induction of embryonal carcinoma cell differentiation by an RA receptor alpha (RAR alpha)-, RAR beta-, or RAR gamma-selective ligand in combination with a retinoid X receptor-specific ligand.
B Roy, R Taneja, P Chambon
Molecular and Cellular Biology Dec 1995, 15 (12) 6481-6487; DOI: 10.1128/MCB.15.12.6481

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Synergistic activation of retinoic acid (RA)-responsive genes and induction of embryonal carcinoma cell differentiation by an RA receptor alpha (RAR alpha)-, RAR beta-, or RAR gamma-selective ligand in combination with a retinoid X receptor-specific ligand.
B Roy, R Taneja, P Chambon
Molecular and Cellular Biology Dec 1995, 15 (12) 6481-6487; DOI: 10.1128/MCB.15.12.6481
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