Format

Send to

Choose Destination
See comment in PubMed Commons below
Cardiovasc Drugs Ther. 2011 Jun;25(3):215-22. doi: 10.1007/s10557-011-6287-7.

Differential effects of vitamin d receptor agonists on gene expression in neonatal rat cardiomyocytes.

Author information

1
University of Illinois at Chicago, Chicago, IL, 60612, USA. jrwuwong@uic.edu

Abstract

PURPOSE:

Vitamin D receptor (VDR) activation is associated with cardiovascular benefits in chronic kidney disease patients, but whether VDR's hormone and prehormone exhibit similar effects requires more studies.

METHODS:

Neonatal rat cardiomyocytes were treated with VDR agonists (calcitriol and/or paricalcitol) and the prehormone calcidiol in the presence of aldo (1 μM). The expression of VDR target genes were determined by real-time PCR and Western blotting. The expression and activity of CYP27B1 (the enzyme responsible for converting calcidiol to calcitriol) was measured.

RESULTS:

Treating cells with aldo (1 μM) for 24 h significantly reduced the VDR mRNA (29%) and protein levels (>90%). Calcitriol and calcidiol induced VDR expression in the presence of aldo with EC(50) at 0.3 and 7,952 nM, respectively. Calcitriol, paricalcitol and calcidiol stimulated CYP24A1 (EC(50) at 6.4, 4.5 and 992 nM, respectively) and suppressed NPPB expression (IC(50) at 1.9, 0.1 and 210 nM, respectively) in the presence of 1 μM aldo. Neonatal rat cardiomyocytes expressed CYP27B1 and converted calcidiol to calcitriol at a low rate (~10% in 24 h).

CONCLUSIONS:

VDR hormone calcitriol and its analog paricalcitol exhibit more potent effects than the prehormone calcidiol in cardiomyocytes.

PMID:
21424825
DOI:
10.1007/s10557-011-6287-7
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Springer
    Loading ...
    Support Center