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Cited by 269

The DOI matches its Crossref record; 43 of the 43 references it cites were found in a registry or an index.

Retinoid X receptors stimulate and 9-cis retinoic acid inhibits 1,25-dihydroxyvitamin D3-activated expression of the rat osteocalcin gene.

Open access
MacDonald, P N, Dowd, D R, Nakajima, S, Galligan, M A, Reeder, M C, Haussler, C A, Ozato, K, Haussler, M R·1993·Molecular and Cellular Biology

Abstract

The vitamin D receptor (VDR) binds the vitamin D-responsive element (VDRE) as a heterodimer with an unidentified receptor auxiliary factor (RAF) present in mammalian cell nuclear extracts. VDR also interacts with the retinoid X receptors (RXRs), implying that RAF may be related to the RXRs. Here we demonstrate that highly purified HeLa cell RAF contained RXR beta immunoreactivity and that both activities copurified and precisely coeluted in high-resolution hydroxylapatite chromatography. Furthermore, an RXR beta-specific antibody disrupted VDR-RAF-VDRE complexes in mobility shift assays. These data strongly indicate that HeLa RAF is highly related to or is identical to RXR beta. Consequently, the effect of the 9-cis retinoic acid ligand for RXRs was examined in 1,25-dihydroxyvitamin D3 [1,25(OH)2D3]-activated gene expression systems. Increasing concentrations of 9-cis retinoic acid (1 nM to 1 microM) markedly reduced 1,25(OH)2D3-dependent accumulation of osteocalcin mRNA in osteoblast-like ROS 17/2.8 cells. All-trans retinoic acid also interfered with vitamin D responsiveness, but it was consistently less potent than the 9-cis isomer. Transient transfection studies revealed that attenuation by 9-cis retinoic acid was at the transcriptional level and was mediated through interactions at the osteocalcin VDRE. Furthermore, overexpression of both RXR beta and RXR alpha augmented 1,25(OH)2D3 responsiveness in transient expression studies. Direct analysis of VDRE binding in mobility shift assays demonstrated that heteromeric interactions between VDR and RXR were enhanced by 1,25(OH)2D3 and were not affected appreciably by 9-cis retinoic acid, except that inhibition was observed at high retinoid concentrations. These data suggest a regulatory mechanism for osteocalcin gene expression that involves 1,25(OH)2D3-induced heterodimerization of VDR and unliganded RXR. 9-cis retinoic acid may attenuate 1,25(OH)2D3 responsiveness by diverting RXRs away from VDR-mediated transcription and towards other RXR-dependent transcriptional pathways.

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Metadata

Authors
MacDonald, P. N., Dowd, D. R., Nakajima, S., Galligan, M. A., Reeder, M. C., Haussler, C. A., Ozato, K., & Haussler, M. R.
Venue
Molecular and Cellular Biology
Published
1993-09
Volume
13
Issue
9
Pages
5907-5917
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W1761203024
Cited by
269
References
43
FWCI
9.24
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Retinoid X receptors stimulate and 9-cis retinoic acid inhibits 1,25-dihydroxyvitamin D3-activated expression of the rat osteocalcin gene. https://app.cochat.ai/papers/10.1128/mcb.13.9.5907
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MacDonald, P. N., Dowd, D. R., Nakajima, S., Galligan, M. A., Reeder, M. C., Haussler, C. A., Ozato, K., & Haussler, M. R. (1993). Retinoid X receptors stimulate and 9-cis retinoic acid inhibits 1,25-dihydroxyvitamin D3-activated expression of the rat osteocalcin gene. Molecular and Cellular Biology. https://doi.org/10.1128/mcb.13.9.5907

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