Hypergravity modulates vitamin D receptor target gene mRNA expression in mice.

@article{Ishizawa2009HypergravityMV,
  title={Hypergravity modulates vitamin D receptor target gene mRNA expression in mice.},
  author={Michiyasu Ishizawa and Ken-ichi Iwasaki and Shigeaki Kato and Makoto Makishima},
  journal={American journal of physiology. Endocrinology and metabolism},
  year={2009},
  volume={297 3},
  pages={
          E728-34
        }
}
The possibility of pathological calcium metabolism is a critical health concern introduced by long-term space travel. Because vitamin D plays an important role in calcium homeostasis, we evaluated the effects of hypergravity on the expression of genes involved in vitamin D and calcium metabolism in ICR mice. When exposed to 2G hypergravity for 2 days, the mRNA expression of renal 25-hydroxyvitamin D 24-hydroxylase (Cyp24a1) was increased and that of 25-hydroxyvitamin D 1alpha-hydroxylase… 

Figures and Tables from this paper

Lithocholic Acid Is a Vitamin D Receptor Ligand That Acts Preferentially in the Ileum

The results indicate that LCA is a selective VDR ligand acting in the lower intestine, particularly the ileum, which may be a signaling molecule, which links intestinal bacteria and host VDR function.

Impairment of Bilirubin Clearance and Intestinal Interleukin-6 Expression in Bile Duct-Ligated Vitamin D Receptor Null Mice

A role of VDR in bilirubin clearance during cholestasis is revealed and is also suggested to contribute to tissue-selective immune regulation.

Vitamin D receptor activation induces peptide YY transcription in pancreatic islets.

The role of pancreatic VDR activation is investigated and it is found that Pyy is a VDR target gene in the mouse pancreas and may mediate a regulatory function of vitamin D in the neuroendocrine system.

Vitamin D Receptor Deletion Changes Bile Acid Composition in Mice Orally Administered Chenodeoxycholic Acid.

Results indicate that VDR deletion influences CDCA metabolism, and VDR may play a role in the excretion of excess bile acids.

Frontline Science: Concanavalin A‐induced acute hepatitis is attenuated in vitamin D receptor knockout mice with decreased immune cell function

This study showed that VDR is functionally expressed in hepatic mononuclear cells, specifically resident Kupffer cells, and examined the role of VDR in acute hepatitis induced by concanavalin A and found that Con‐A‐induced hepatitis is attenuated in VDR‐KO mice compared to wild‐type (WT) mice.

Stress response and humoral immune system alterations related to chronic hypergravity in mice

Hypergravity Increases Blood–Brain Barrier Permeability to Fluorescent Dextran and Antisense Oligonucleotide in Mice

Experimental protocols of hypergravity exposure on C57Bl/6JRJ mice to induce motion sickness and reveal its effects on the blood–brain barrier confirm the alteration in the BBB after a short period of hyper gravity exposure.

Modifications de l'immunité humorale induites par des changements de la gravité

Au cours de ma these, j'ai etudie l'impact des stress associes aux vols spatiaux sur l'immunite humorale du pleurodele et de la souris. Chez le pleurodele adulte, j'ai d'abord etudie l'utilisation

Vitamin D3 Modulates the Expression of Bile Acid Regulatory Genes and Represses Inflammation in Bile Duct-Ligated Mice

Findings indicate that 1α(OH)D3 regulates a network of bile acid metabolic genes and represses proinflammatory cytokine expression in BDL mice and VDR ligands have the potential to prevent the cholestasis-induced inflammatory response.

The Nuclear Vitamin D Receptor: Biological and Molecular Regulatory Properties Revealed

  • M. HausslerG. Whitfield P. Jurutka
  • Biology, Chemistry
    Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research
  • 1998
The scope of this review will be limited to highlighting the actions of 1,25(OH)2D3 mediated by nuclear VDR and discussing new developments in the structure/function analysis of the receptor, including the phenotype of VDR knockout mice and the biochemical classification of patients with point mutations in the receptor.

Mice lacking the vitamin D receptor exhibit impaired bone formation, uterine hypoplasia and growth retardation after weaning

It is reported here that in VDR null mutant mice, no defects in development and growth were observed before weaning, irrespective of reduced expression of vitamin D target genes, which establishes a critical role for VDR in growth, bone formation and female reproduction in the post-weaning stage.

Hypergravity Stimulates Osteoblast Phenotype Expression: A Therapeutic Hint for Disuse Bone Atrophy

The appropriate level of hypergravity enhanced the VD‐inducible expression of osteocalcin, a typical phenotype of osteoblast differentiation, and molecular features to prevent disuse bone atrophy of long‐term bed‐rest patients are suggested.

1alpha,25(OH)2D3-induced DNA methylation suppresses the human CYP27B1 gene.

It is shown that histone deacetylation is a critical step for chromatin structure remodeling in suppression of the CYP27B1 gene, and it is demonstrated that, in addition to histone acetylation, this transrepression by VDR requires DNA methylation in the CYp27 B1 gene promoter.

Enhancers located within two introns of the vitamin D receptor gene mediate transcriptional autoregulation by 1,25-dihydroxyvitamin D3.

The results demonstrate that 1,25-(OH)2D3 and its receptor autoregulate the expression of the VDR gene.

Lithocholic acid derivatives act as selective vitamin D receptor modulators without inducing hypercalcemia Published, JLR Papers in Press, January 7, 2008.

In vivo experiments showed that LCA acetate and LCA propionate effectively induced tissue VDR activation without causing hypercalcemia, and these bile acid derivatives have the ability to function as selective VDR modulators.

Role of MAP Kinases in the 1,25-Dihydroxyvitamin D3-induced Transactivation of the Rat Cytochrome P450C24 (CYP24) Promoter

The ERK1/ERK2 and ERK5 modules provide a novel mechanism for linking the rapid signal transduction and slower transcription actions of 1,25D to induce CYP24 gene expression.