Faculty Articles

Title

Suppression Of Adrenal βarrestin1-Dependent Aldosterone Production By ARBs: Head-To-Head Comparison.

ISBN or ISSN

2045-2322

Location

United Kingdom

Publication Title

Scientific Reports

Volume

5

Publication Date / Copyright Date

1-29-2015

First Page

8116

Last Page

8116

Publisher

Nature Publishing Group

DOI Number

10.1038/srep08116

Abstract

The known angiotensin II (AngII) physiological effect of aldosterone synthesis and secretion is mediated by either Gq/11 proteins or βarrestin1 (βarr1), both of which can couple to its type 1 receptors (AT₁Rs), present in adrenocortical zona glomerulosa (AZG) cell membranes. In the present study, we examined the relative potencies of all the currently used in the clinic AT₁R antagonist drugs (angiotensin receptor blockers, ARBs, or sartans) at preventing activation of these two signaling mediators (G proteins and βarrs) at the AngII-bound AT1R and, consequently, at suppression of aldosterone in vitro. All ARBs were found to be potent inhibitors of G protein activation at the AT₁R. However, candesartan and valsartan were the most potent at blocking AngII-induced βarr activation at this receptor, among the tetrazolo-biphenyl-methyl derivatives, translating into excellent efficacies at aldosterone suppression in H295R cells. Conversely, irbesartan and losartan were largely G protein-selective inhibitors at the AT₁R, with very low potency towards βarr inhibition. As a result, they were very weak suppressors of βarr1-dependent aldosterone production in H295R cells. These findings provide important pharmacological insights into the drug class of ARBs and medicinal chemistry insights for future drug development in the field of AngII antagonism.

Disciplines

Medicine and Health Sciences | Pharmacy and Pharmaceutical Sciences

Keywords

aldosterone, angiotensin, angiotensin ii, angiotensin receptor antagonists, animals, arrestins, benzimidazoles, beta-arrestins, CHO cells, cricetinae, cricetulus, GTP-binding proteins, humans, phosphoproteins, rats, receptor, tetrazoles, type 1, up-regulation, valine, valsartan, zona glomerulosa

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