Mechanistic aspects of mineralocorticoid receptor activation

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Mechanistic aspects of mineralocorticoid receptor activation Chantal Hellal-Levy, Jérôme Fagart, Anny Souque, Dr Marie-Edith Rafestin-Oblin Kidney International Volume 57, Issue 4, Pages 1250-1255 (April 2000) DOI: 10.1046/j.1523-1755.2000.00958.x Copyright © 2000 International Society of Nephrology Terms and Conditions

Figure 1 Schematic representation of the human mineralocorticoid receptor (hMR) structural organization. Kidney International 2000 57, 1250-1255DOI: (10.1046/j.1523-1755.2000.00958.x) Copyright © 2000 International Society of Nephrology Terms and Conditions

Figure 2 Human mineralocorticoid receptor (hMR) steroid agonist (aldosterone, cortisol, and dexamethasone) and antagonist (progesterone and RU26752) ligands. Kidney International 2000 57, 1250-1255DOI: (10.1046/j.1523-1755.2000.00958.x) Copyright © 2000 International Society of Nephrology Terms and Conditions

Figure 3 Transcriptional activation of luciferase activity by wild-type and mutant hMRs. COS-7 cells were transfected with wild-type or mutant-hMR expression vectors, pFC31luc as the reporter plasmid, and a β-galactosidase internal reporter to correct for transfection efficiency. Before harvesting, cells were treated for 24 hours with 10-6 mol/L aldosterone (▪) or cortisol (). Transactivation was determined by luciferase activity, normalized to the internal β-galactosidase control, and expressed as a percentage of wild-type activity at 10-6 mol/L. Each point is the mean ± SEM of three separate experiments. Kidney International 2000 57, 1250-1255DOI: (10.1046/j.1523-1755.2000.00958.x) Copyright © 2000 International Society of Nephrology Terms and Conditions

Figure 4 Dissociation kinetics of [3H]-aldosterone (•), [3H]-cortisol (▲), and [3H]-RU26752 (▪) from the wild-type hMR. Wild-type hMR was produced by translation in vitro in the rabbit reticulocyte lysate. The lysate was diluted twofold with TEGWD buffer and incubated with 10 nmol/L [3H]-aldosterone [3H]-cortisol, or [3H]-RU26752 for 30 minutes at 20°C. The end of this incubation period was time zero for kinetic analysis. The lysate was then divided into two. One sample was kept at 20°C to measure the stability of steroid-binding sites, and the other was incubated with 1 μmol/L unlabeled aldosterone, cortisol, or RU26752. Bound and free steroids were separated by dextran charcoal. Nonspecific binding was measured in parallel incubations for each incubation time. Results are corrected for receptor stability and are expressed as a percentage of the binding measured at zero time. Kidney International 2000 57, 1250-1255DOI: (10.1046/j.1523-1755.2000.00958.x) Copyright © 2000 International Society of Nephrology Terms and Conditions

Figure 5 An equilibrium model for hMR activation. In the absence of hormone, the hMR exists in a transcriptionally inactive conformation. After agonist binding, the receptor is converted to a transient inactive conformation and then to a transcriptionally active conformation. The contacts between the hMR and aldosterone in the helix H12 region stabilize hMR in its active conformation. After antagonist binding, the receptor adopts the transient inactive conformation. The loss of contacts between hMR and antagonists prevents the stabilization of H12 in its active position. Kidney International 2000 57, 1250-1255DOI: (10.1046/j.1523-1755.2000.00958.x) Copyright © 2000 International Society of Nephrology Terms and Conditions