scholarly journals Obesity Represses CYP2R1 , the Vitamin D 25‐Hydroxylase, in the Liver and Extrahepatic Tissues

JBMR Plus ◽  
2020 ◽  
Vol 4 (11) ◽  
Author(s):  
Mahmoud‐Sobhy Elkhwanky ◽  
Outi Kummu ◽  
Terhi T Piltonen ◽  
Johanna Laru ◽  
Laure Morin‐Papunen ◽  
...  
Keyword(s):  
Vitamin D ◽  
Extrahepatic Tissues

1,25-Dihydroxyvitamin D3 downregulates the rat intestinal vitamin D3-25-hydroxylaseCYP27A

2001 ◽  
Vol 281 (2) ◽  
pp. E315-E325 ◽  
Author(s):  
Catherine Theodoropoulos ◽  
Christian Demers ◽  
Ali Mirshahi ◽  
Marielle Gascon-Barré
Keyword(s):  
Vitamin D ◽  
Direct Action ◽  
Dihydroxyvitamin D3 ◽  
Hydroxyvitamin D ◽  
Dihydroxyvitamin D ◽  
Protein Levels ◽  
25 Hydroxyvitamin D ◽  
Extrahepatic Tissues ◽  
Mrna Half Life

The vitamin D3-25-hydroxylase CYP27A is located predominantly in liver, but its expression is also detected in extrahepatic tissues. Our aim was to evaluate the regulation of CYP27A by vitamin D3 (D3) or its metabolites in rat duodena. Vitamin D-depleted rats were repleted with D3, 25-hydroxyvitamin D (25OHD), or 1,25-dihydroxyvitamin D3[1,25(OH)2D3] or acutely injected 1,25(OH)2D3 to investigate the mechanisms of action of the hormone. All D3 compounds led to a progressive decrease in CYP27A mRNA, with levels after D3 representing 20% of that observed in D depletion. 25OHD decreased CYP27A mRNA by 55%, whereas 1,25(OH)2D3 led to a 40% decrease, which was accompanied by a 31% decrease in CYP27A protein levels and an 89% decrease in enzyme activity. Peak circulating 1,25(OH)2D3 concentrations were, however, the highest in D3-repleted, followed by 25OHD- and 1,25(OH)2D3-repleted animals. 1,25(OH)2D3 resulted in a decrease in both CYP27A mRNA half-life and transcription rate. Our data illustrate that the intestine expresses the D3-25-hydroxylase and that the gene is highly regulated in vivo through a direct action of 1,25(OH)2D3 or through the local production of D3 metabolites.

Association of vitamin D receptor genotypes with early onset rheumatoid arthritis

2001 ◽  
Vol 28 (1) ◽  
pp. 89-93 ◽  
Author(s):  
J. R. Garcia-Lozano ◽  
M. F. Gonzalez-Escribano ◽  
A. Valenzuela ◽  
A. Garcia ◽  
A. Nunez-Roldan
Keyword(s):  
Rheumatoid Arthritis ◽  
Vitamin D ◽  
Vitamin D Receptor ◽  
Early Onset

803: Interactions Between Ultraviolet Radiation and Polymorphisms in the Vitamin D Receptor Gene Mediate Prostate Cancer Susceptibility

2006 ◽  
Vol 175 (4S) ◽  
pp. 260-260
Author(s):  
Nicholas J. Rukin ◽  
Samuel J. Moon ◽  
Dhaval Bodiwala ◽  
Christopher J. Luscombe ◽  
Mark F. Saxby ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Vitamin D ◽  
Ultraviolet Radiation ◽  
Vitamin D Receptor ◽  
Cancer Susceptibility ◽  
Receptor Gene ◽  
Vitamin D Receptor Gene ◽  
Prostate Cancer Susceptibility

190: BXL-628, a Vitamin D Analog, Decreases RHOA/ROK Signalling in Rat and Human Bladder

2006 ◽  
Vol 175 (4S) ◽  
pp. 62-62
Author(s):  
Annamaria Morelli ◽  
Sandra Filippi ◽  
Rosa Mancina ◽  
Linda Vignozzi ◽  
Gabriella B. Vannelli ◽  
...  
Keyword(s):  
Vitamin D ◽  
Human Bladder ◽  
Vitamin D Analog

1615: Testicular Maturation Arrest to Testis Cancer - is there a Spectrum of Expression of Vitamin D Receptors and a Role for Vitamin D Treatment

2006 ◽  
Vol 175 (4S) ◽  
pp. 520-521
Author(s):  
Ajay K. Nangia ◽  
Vince Memoli ◽  
Alan Schned ◽  
Oya Hill ◽  
Catherine E. Schwender
Keyword(s):  
Vitamin D ◽  
Testis Cancer ◽  
Maturation Arrest ◽  
Vitamin D Receptors
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