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MR is a nuclear hormone receptor whose unidirectional transfer to the nucleus may be regulated through multiple pathways. MR is expressed through alternative translation initiation, as distinct protein variants which possess different functional properties. Missense mutations of the human mineralocorticoid receptor disclose important residues involved in DNA binding, intracellular trafficking, and ligand binding. PIAS1 conjugates SUMO-1 to human mineralocorticoid receptor. Results reveal differential modulatory roles of the protein inhibitor of activated STAT proteins on the transcriptional properties of mineralocorticoid and glucocorticoid receptors. The MR contribution to nongenotropic effects of aldosterone was shown. The S810L missense mutation of the mineralocorticoid receptor does not play a major role in the etiology of pregnancy-induced hypertension in a German /Turkish population. The S810L mutation within the human mineralocorticoid receptor (MR S810L) induces severe hypertension. Site directed mutagenesis studies. The endogenous vascular smooth muscle MR mediates angiotensin II- and aldosterone-dependent gene expression, including several involved in vascular fibrosis, inflammation, and calcification. These findings demonstrate a coupling between MR up-regulation and transcriptional hyperactivity. Two frameshift mutations in exon 2 and one nonsense mutation in exon 4 (generate truncated proteins due to premature stop codons. Three missense mutations ) differently affect hMR function. DNA binding domain mutant has reduced maximal transactivation. Chenodeoxycholic acid and deoxycholic acid, by inhibiting 11 beta HSD2, mediate cortisol-dependent nuclear translocation and transcriptional activation of Mineralocorticoid receptor. Cortisone and 11-dehydrocorticosterone, the main cortisol and corticosterone metabolites produced in the distal nephron, where sodium reabsorption stimulated by aldosterone takes place, bind with high affinity to S810L mineralocorticoid receptor. Downregulation of MLR by aldosterone. Glucocorticoid and mineralocorticoid cross-talk with PR to produce progesterone-like effects in breast cancer cells. Mineralocorticoid receptor has a ligand-dependent interaction with coactivator and corepressor peptides. Our findings suggest a novel interplay between cAMP and MR signaling pathways; the N-terminal and the DNA binding domains of hMR are essential for enhancement of the catecholamine signal transduction pathway.
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