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Calcitriol is a hormone and the active form of vitamin D, normally made in the kidney. [ 8 ] [ 9 ] [ 10 ] It is also known as 1,25-dihydroxycholecalciferol . It binds to and activates the vitamin D receptor in the nucleus of the cell, which then increases the expression of many genes. [ 11 ]
The natural, active form of vitamin D is calcitriol (1,25-dihydroxycholecalciferol). This molecule and other naturally occurring forms of vitamin D, including its precursors and metabolites, have been modified to synthesize pharmaceuticals with potentially greater, or selective, therapeutic actions.
The vitamin D receptor (VDR also known as the calcitriol receptor) is a member of the nuclear receptor family of transcription factors. [5] Calcitriol (the active form of vitamin D , 1,25-(OH) 2 vitamin D 3 ) binds to VDR, which then forms a heterodimer with the retinoid-X receptor .
Calcitriol plays a key role in regulating vitamin D levels through a negative feedback mechanism. [203] It strongly upregulates the expression of the enzyme CYP24A1 , which inactivates vitamin D. This activation happens through binding of the activated vitamin D receptor (VDR) to two vitamin D response elements (VDREs) in the in the CYP24A1 gene.
Calcipotriol, also known as calcipotriene, is a synthetic derivative of calcitriol, a form of vitamin D. It is used in the treatment of psoriasis. [1] It is safe for long-term application in psoriatic skin conditions. [medical citation needed] It was patented in 1985 and approved for medical use in 1991. [2]
Calcitroic acid (1α-hydroxy-23-carboxy-24,25,26,27-tetranorvitamin D 3) is a major metabolite of 1α,25-dihydroxyvitamin D 3 (calcitriol). [1] Around 1980, scientists first reported the isolation of calcitroic acid from the aqueous extract of radioactively treated animals' livers and intestines.
Calcifediol is the precursor for calcitriol, the active form of vitamin D. [3] [4] It is synthesized in the liver, by hydroxylation of cholecalciferol (vitamin D 3) at the 25-position. [3] This enzymatic 25-hydroxylase reaction is mostly due to the actions of CYP2R1 , present in microsomes , although other enzymes such as mitochondrial CYP27A1 ...
13115 Ensembl ENSG00000111012 ENSMUSG00000006724 UniProt O15528 O35084 RefSeq (mRNA) NM_000785 NM_010009 RefSeq (protein) NP_000776 NP_034139 Location (UCSC) Chr 12: 57.76 – 57.77 Mb Chr 10: 126.88 – 126.89 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse calcidiol 1-monooxygenase Identifiers EC no. 1.14.15.18 CAS no. 9081-36-1 Databases IntEnz IntEnz view BRENDA BRENDA entry ...