The balance between bioactivation and degradation of 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] is critical for ensuring appropriate biological effects of vitamin D. Cytochrome P450, family 24-mediated (CYP24-mediated) 24-hydroxylation of 1,25(OH)2D3 is an important step in the catabolism of 1,25(OH)2D3. The enzyme is directly regulated by vitamin D receptor (VDR), and it is expressed mainly in the...

Vitamin D receptor (VDR) and liver X receptor (LXR) are nuclear receptors, which regulate gene transcription upon binding of their specific ligands. VDR seems to play a role in the regulation of prostate cancer cell proliferation. ATP-binding cassette transporter A1 (ABCA1) is known to be a target gene of LXR and it has been reported to be inhibited by androgen and to be involved in the regulat...

This report describes the presence and activity of 1,25-dihydroxyvitamin D3 (1,25-D3) in experimental bovine tuberculosis. Animals that went on to develop tuberculous lesions exhibited a rapid transient increase in serum 1,25-D3 within the first 2 weeks following infection with Mycobacterium bovis. 1,25-D3-positive mononuclear cells were later identified in all tuberculous granulomas by immunoh...

Cholangiopathies are chronic liver diseases in which damaged cholangiocytes trigger a proinflammatory and profibrotic reaction. The nuclear vitamin D receptor (VDR) is highly expressed exerts immune-regulatory functions these cells. In the present study, we examined protective function of VDR other signaling pathways cholangiopathy cholangiocytes. Vdr was invalidated Abcb4 knockout mice, widely...

objective(s) deregulation of the immune system through allied factors and cytokine responses are thought to be important contributors to the pathogenesis of asthma. vitamin d3 and its nuclear receptor appear to be factors that maybe involved in regulating immune responses during the progression of asthma. the aim of this study was to investigate the association between polymorphisms in intron 8...

Background: Chronic kidney disease-mineral and bone disorder (CKD-MBD) has been implicated in vascular calcification pathogenesis. CKD-MBD results in alterations in the number and function of circulating endothelial progenitor cells (EPCs), physiological regulators of angiogenesis and vessel repair, commonly defined as proangiogenic progenitor cells (PACs) by the antigen pattern CD34+CD133+KDR+...

Metadichol ® a novel nano emulsion of lipid alcohols is an Inverse agonist of Vitamin D Receptor (VDR). In this communication, we show that Metadichol is an inverse agonist of the nuclear receptor AHR (Aryl Hydrocarbon receptor) and also an inhibitor of NRF2 (Nuclear factor (erythroid-derived 2)-like 2) and is a transcription factor that is ubiquitously expressed at low levels in all human orga...

Metadichol ® a novel nano emulsion of lipid alcohols is an Inverse agonist of Vitamin D Receptor (VDR). In this communication, we show that Metadichol is an inverse agonist of the nuclear receptor AHR (Aryl Hydrocarbon receptor) and also an inhibitor of NRF2 (Nuclear factor (erythroid-derived 2)-like 2) and is a transcription factor that is ubiquitously expressed at low levels in all human orga...

Although the main role of 1alpha,25-dihydroxyvitamin D(3) [1,25-(OH)(2)D(3)] is to regulate calcium homeostasis, the valuable therapeutic applications of this compound have led to the search of new 1,25-(OH)(2)D(3)-vitamin D receptor (VDR) ligands with less side effects. In this work we have characterized seven 1,25-(OH)(2)D(3) derivatives (ZK136607, ZK161422, ZK157202, ZK159222, ZK168492, ZK19...

OBJECTIVE : Vitamin D receptor (VDR) mediates vitamin D activity. We examined whether VDR expression in excised melanoma tissues is associated with VDR gene (VDR) polymorphisms. METHODS : We evaluated VDR protein expression (by monoclonal antibody immunostaining), melanoma characteristics, and carriage of VDR-FokI-rs2228570 (C>T),VDR-BsmI-rs1544410 (G>A),VDR-ApaI-rs7975232 (T>G), andVDR-TaqI-...