11beta-Hydroxysteroid dehydrogenase in the heart of normotensive and hypertensive rats

Corticosteroids have been shown to play a role in cardiac remodeling, with the possibility of a direct effect of overexpression of 11beta-hydroxysteroid dehydrogenase (11HSD) isoform 2 at the level of the cardiomyocytes. The aim of this study was to examine cardiac steroid metabolism in hypertensive...

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Bibliographic Details
Published in:The Journal of steroid biochemistry and molecular biology 2005-02, Vol.94 (1-3), p.273-277
Main Authors: Mazancová, Karla, Kopecký, Martin, Miksík, Ivan, Pácha, Jirí
Format: Article
Language:English
Subjects:
11-beta-Hydroxysteroid Dehydrogenase Type 1 - genetics
11-beta-Hydroxysteroid Dehydrogenase Type 1 - metabolism
Animals
Cardiomegaly - enzymology
Diet, Sodium-Restricted
Gene Expression Regulation, Enzymologic
Glucocorticoids - metabolism
Hypertension - enzymology
Kinetics
Male
Myocardium - enzymology
Phenotype
Rats
Rats, Inbred Dahl
Rats, Inbred SHR
Rats, Inbred WKY
Reference Values
RNA, Messenger - genetics
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Summary:Corticosteroids have been shown to play a role in cardiac remodeling, with the possibility of a direct effect of overexpression of 11beta-hydroxysteroid dehydrogenase (11HSD) isoform 2 at the level of the cardiomyocytes. The aim of this study was to examine cardiac steroid metabolism in hypertensive rats with hearts that are hypertrophied and fibrotic and have structural alterations in the coronary circulation. To assess possible alterations of cardiac steroid metabolism the expression and activity of both isoforms of 11beta-hydroxysteroid dehydrogenase (11HSD) were studied in spontaneously hypertensive rats (SHR), their normotensive controls Wistar-Kyoto (WKY), and in Dahl salt-sensitive (DS) and salt-resistant rats (DR) kept on a low- or high-salt diet. Using real-time quantitative RT-PCR and enzyme activity assay we found strain-dependent differences in cardiac metabolism of glucocorticoids. In Dahl rats expression of 11HSD1 and 11HSD2 mRNA was lower in DS than in DR rats and was not influenced by dietary salt intake; 11HSD1 mRNA was expressed at higher level than 11HSD2 mRNA. NADP(+)-dependent cardiac 11HSD activity showed similar distribution as 11HSD1 mRNA-lower activity in DS than in DR rats and no effect of salt intake. In SHR and WKY strains 11HSD2 mRNA expression was significantly higher in WKY than in SHR but no differences were observed in 11HSD1 mRNA abundance and NADP(+)-dependent 11HSD activity. These results show that the heart is able to metabolize glucocorticoids and that this metabolism is strain-dependent but do not support the notion of association between cardiac hypertrophy and changes of 11HSD1 and 11HSD2 expression.
ISSN:0960-0760
1879-1220