Cited by 46Circadian rhythm and melatoninVitamin D Research StudiesBone Metabolism and Diseases

Identification of a novel melatonin-binding nuclear receptor: Vitamin D receptor

Fang, Nan, Hu, Chunyi, Sun, Wenqi, Xu, Ying, Gu, Yeqi, Wu, Le, Peng, Qing, Reiter, Russel J. +1 more·2020·Journal of Pineal Research

Abstract

Previous studies confirmed that melatonin regulates Runx2 expression but the mechanism is unclear. There is a direct interaction between Runx2 and the vitamin D receptor (VDR). Herein, we observed a direct interaction between melatonin and the VDR but not Runx2 using isothermal titration calorimetry. Furthermore, this direct binding was detected only in the C-terminal ligand binding domain (LBD) of the VDR but not in the N-terminal DNA-binding domain (DBD) or the hinge region. Spectrophotometry indicated that melatonin and vitamin D3 (VD3) had similar uptake rates, but melatonin's uptake was significantly inhibited by VD3 until the concentration of melatonin was obviously higher than that of VD3 in a preosteoblastic cell line MC3T3-E1. GST pull-down and yeast two-hybrid assay showed that the interactive smallest fragments were on the 319-379 position of Runx2 and the N-terminus 110-amino acid DBD of the VDR. Electrophoretic mobility shift assay (EMSA) demonstrated that Runx2 facilitated the affinity between the VDR and its specific DNA substrate, which was further documented by a fluorescent EMSA assay where Cy3 labeled Runx2 co-localized with the VDR-DNA complex. Another fluorescent EMSA assay confirmed that the binding of the VDR to Runx2 was significantly enhanced with an increasing concentrations of the VDR, especially in the presence of melatonin; it was further documented using a co-immunoprecipitation assay that this direct interaction was markedly enhanced by melatonin treatment in the MC3T3-E1 cells. Thus, the VDR is a novel melatonin-binding nuclear receptor, and melatonin indirectly regulates Runx2 when it directly binds to the LBD and the DBD of the VDR, respectively.

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Crossref · 10.1111/jpi.12618

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Authors
Fang, N., Hu, C., Sun, W., Xu, Y., Gu, Y., Wu, L., Peng, Q., Reiter, R. J., & Liu, L.
Affiliations
  • Tongji University (CN)
  • Chinese Academy of Sciences (CN)
  • The University of Texas at San Antonio Health Science Center (US)
Corresponding author
Liu, Lifeng
Venue
Journal of Pineal Research
Publisher
Wiley
Published
2019-11-11
Volume
68
Issue
1
Pages
e12618-e12618
ISSN
  • 0742-3098 (ISSN-L)
  • 1600-079X
OpenAlex
W2982254695
Cited by
46
References
67
Citations by year
2026: 2 · 2025: 6 · 2024: 8 · 2023: 6 · 2022: 5 · 2021: 8 · 2020: 10 · 2019: 1
FWCI
3.31
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pineal Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Natural Science Foundation of China (81770870)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Vitamin D Research Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
Keywords
melatonin, vitamin D receptor, Runx2, nuclear receptor binding, ligand-binding domain, DNA-binding domain, vitamin D3, protein-protein interaction, transcriptional regulation, osteoblasts, MC3T3-E1 cells
MeSH terms
Protein Domains, Animals, Cell Line, Humans, Melatonin, Protein Binding, Receptors, Calcitriol, Core Binding Factor Alpha 1 Subunit, Mice, HEK293 Cells

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