(Circulation. 1995;92:175-182.)
© 1995 American Heart Association, Inc.
Articles |
Prerequisite for Cardiac Aldosterone Action
Mineralocorticoid Receptor and 11ß-Hydroxysteroid Dehydrogenase in the Human Heart
From INSERM U246, Institut Fédératif de Recherche "Cellules épithéliales," Faculté de Médecine X. Bichat, Paris, France.
Correspondence to Marc Lombès, INSERM U246, Faculté de Médecine X. Bichat, 16, rue H. Huchard, BP 416, 75870 Paris, CEDEX 18, France.
Background It has been proposed that aldosterone exerts direct effects on heart function, most notably on the development of myocardial fibrosis during ventricular hypertrophy in rat. Initial events in aldosterone action entail its binding to mineralocorticoid receptor (MR). Because MR displays similar affinities for aldosterone and glucocorticoids, the in vivo aldosterone selectivity of MR requires the presence of an enzyme, 11ß-hydroxysteroid dehydrogenase (11-HSD), which metabolizes glucocorticoids into inactive derivatives. Although evidence exists for the presence of MR in rodent heart, no data are available for humans; moreover, the existence of cardiac 11-HSD is controversial.
Methods and Results The heart samples used originated from tissue removed during cardiac surgery in nontransplant patients or from endocavitary biopsies done for the follow-up of heart transplantation. The expression of MR was examined at the mRNA and protein level by in situ hybridization with cRNA probes specific for human MR mRNA and by immunodetection with two specific anti-MR antibodies. 11-HSD catalytic activity was determined by measurement of the metabolic rate of tritiated corticosteroids by cardiac samples. In nontransplanted hearts, an in situ hybridization signal equivalent to that found in the whole kidney was present on cardiomyocytes. Specific immunolabeling of cardiomyocytes with anti-MR antibodies demonstrated the presence of the MR protein. Cardiac 11-HSD activity was detected (243±26 fmol · 30 min-1 · mg protein-1) and was dependent on the cofactor NAD, not NADP, suggesting that it corresponds to the form of the enzyme specifically responsible for MR protection. In transplanted hearts that presented severe alterations, MR immunodetection was weaker and irregular, with no specific hybridization signal.
Conclusions Our results demonstrate that MR is coexpressed with 11-HSD in human heart, which thus possesses the cellular machinery required for direct aldosterone action.
Key Words: adrenal cortex hormones • glucocorticoids • transplantation • antibodies • enzymes
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