Interaction of the Mineralocorticoid Receptor With RACK1 and Its Role in Aldosterone Signaling.

Abstract:

:The mineralocorticoid receptor (MR) is a member of the steroid-thyroid hormone receptor superfamily of ligand-dependent transcription factors with diverse functions including the biological actions of aldosterone. Identification of the various transcriptional coregulators of MR is essential for understanding the complexity of MR signaling pathways under physiological and pathological conditions. We used a yeast two-hybrid system to find proteins that interact with a full-length MR and found, among other proteins, that MR interacted specifically with receptor for activated C kinase 1 (RACK1), a scaffolding protein. Overexpression of RACK1 using a tetracycline-inducible lentivirus in mouse cortical collecting duct M1 cells stably expressing the rat MR and a Gaussia luciferase gene reporter under a hormone-response element promoter resulted in enhanced agonist-dependent MR transactivation. Knockdown of RACK1 protein expression by short hairpin RNAs led to a significant reduction in MR activation of the reporter gene and the endogenous genes Ctla2α and Psca. We also demonstrated that RACK1 regulation of MR action is mediated through phosphorylation by the PKC-β signaling pathway. MR and RACK1 were coimmunoprecipitated using an MR antibody in male Sprague-Dawley brain tissue and M1-rMR cells, and colocalization in M1-rMR cells and male rat brains was confirmed by immunofluorescence and immunohistochemistry. The scaffolding protein RACK1 is associated with MR under basal and agonist-stimulated conditions and facilitates agonist-stimulated MR actions through PKC-β. These findings indicate that RACK1 is a newly described coactivator of MR.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Kuppusamy M,Gomez-Sanchez EP,Beloate LN,Plonczynski M,Naray-Fejes-Toth A,Fejes-Toth G,Gomez-Sanchez CE

doi

10.1210/en.2017-00095

subject

Has Abstract

pub_date

2017-07-01 00:00:00

pages

2367-2375

issue

7

eissn

0013-7227

issn

1945-7170

pii

3788681

journal_volume

158

pub_type

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