In:
Biopharmaceutics & Drug Disposition, Wiley, Vol. 31, No. 1 ( 2010-01), p. 91-108
Abstract:
1α,25‐Dihydroxyvitamin D 3 (1,25(OH) 2 D 3 ), the natural ligand of the vitamin D receptor (VDR), was found to regulate bile acid related transporters and enzymes directly and indirectly in the rat intestine and liver in vivo . The kidney is another VDR‐rich target organ in which VDR regulation on xenobiotic transporters and enzymes is ill‐defined. Hence, changes in protein and mRNA expression of nuclear receptors, transporters and enzymes of the rat intestine and kidney in response to 1,25(OH) 2 D 3 treatment (0 to 2.56 nmol/kg/day intraperitoneally in corn oil for 4 days) were studied. In the intestine, protein and not mRNA levels of Mrp2, Mrp3, Mrp4 and PepT1 in the duodenum and proximal jejunum were induced, whereas Oat1 and Oat3 mRNA were decreased in the ileum after 1,25(OH) 2 D 3 treatment. In the kidney, VDR, Cyp24, Asbt and Mdr1a mRNA and protein expression increased significantly (2‐ to 20‐fold) in 1,25(OH) 2 D 3 ‐treated rats, and a 28‐fold increase of Cyp3a9 mRNA but not of total Cy3a protein nor Cyp3a1 and Cyp3a2 mRNA was observed, implicating that VDR played a significant, renal‐specific role in Cyp3a9 induction. Additionally, renal mRNA levels of PepT1, Oat1, Oat3, Ostα, and Mrp4, and protein levels of PepT1 and Oat1 were decreased in a dose‐dependent manner, and the ∼50% concomitant reduction in FXR, SHP, HNF‐1α and HNF‐4α mRNA expression suggests the possibility of cross‐talk among the nuclear receptors. It is concluded that the effects of 1,25(OH) 2 D 3 changes are tissue‐specific, differing between the intestine and kidney which are VDR‐rich organs. Copyright © 2009 John Wiley & Sons, Ltd.
Type of Medium:
Online Resource
ISSN:
0142-2782
,
1099-081X
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
1496395-4
SSG:
12
SSG:
15,3
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