möglich sobald bei der ZB eingereicht worden ist.
Gene targeting by the vitamin D response element binding protein reveals a role for vitamin D in osteoblast mTOR signaling.
FASEB J. 25, 937-947 (2011)
Transcriptional regulation by hormonal 1,25-dihydroxyvitamin D(3) [1,25(OH)(2)D(3)] involves occupancy of vitamin D response elements (VDREs) by the VDRE binding protein (VDRE-BP) or 1,25(OH)(2)D(3)-bound vitamin D receptor (VDR). This relationship is disrupted by elevated VDRE-BP, causing a form of hereditary vitamin D-resistant rickets (HVDRR). DNA array analysis showed that of 114 genes regulated by 1,25(OH)(2)D(3) in control cells, almost all (113) were rendered insensitive to the hormone in VDRE-BP-overexpressing HVDRR cells. Among these was the gene for DNA-damage-inducible transcript 4 (DDIT4), an inhibitor of mammalian target of rapamycin (mTOR) signaling. Chromatin immunoprecipitation PCR using 1,25(OH)(2)D(3)-treated osteoblasts confirmed that VDR and VDRE-BP compete for binding to the DDIT4 gene promoter. Expression of DDIT4 mRNA in these cells was induced (1.6-6 fold) by 1,25(OH)(2)D(3) (10-100 nM), and Western blot and flow cytometry analysis showed that this response involved suppression of phosphorylated S6K1(T389) (a downstream target of mTOR) similar to rapamycin treatment. siRNA knockdown of DDIT4 completely abrogated antiproliferative responses to 1,25(OH)(2)D(3), whereas overexpression of VDRE-BP exerted a dominant-negative effect on transcription of 1,25(OH)(2)D(3)-target genes. DDIT4, an inhibitor of mTOR signaling, is a direct target for 1,25(OH)(2)D(3) and VDRE-BP, and functions to suppress cell proliferation in response to vitamin D.
Impact Factor
Scopus SNIP
Web of Science
Times Cited
Times Cited
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Cited By
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Altmetric
6.515
1.557
46
92
Anmerkungen
Besondere Publikation
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
resistance; bone; vitamin D receptor
Sprache
englisch
Veröffentlichungsjahr
2011
HGF-Berichtsjahr
2011
ISSN (print) / ISBN
0892-6638
e-ISSN
1530-6860
Zeitschrift
FASEB Journal
Quellenangaben
Band: 25,
Heft: 3,
Seiten: 937-947
Verlag
Wiley
Verlagsort
Bethesda, Md.
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Experimental Genetics (IEG)
POF Topic(s)
30201 - Metabolic Health
Forschungsfeld(er)
Genetics and Epidemiology
PSP-Element(e)
G-500600-004
PubMed ID
21123297
Scopus ID
79954614306
Erfassungsdatum
2011-05-16