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I?-Arrestin-Biased Agonist Targeting the Brain AT1R (Angiotensin II Type 1 Receptor) Increases Aversion to Saline and Lowers Blood Pressure in Deoxycorticosterone Acetate-Salt Hypertension. Hypertension 2021 02;77(2):420-431

Date

12/01/2020

Pubmed ID

33249862

Pubmed Central ID

PMC7855825

DOI

10.1161/HYPERTENSIONAHA.120.15793

Scopus ID

2-s2.0-85100070274   6 Citations

Abstract

Activation of central AT1Rs (angiotensin type 1 receptors) is required for the increased blood pressure, polydipsia, and salt intake in deoxycorticosterone acetate (DOCA)-salt hypertension. TRV120027 (TRV027) is an AT1R-biased agonist that selectively acts through I?-arrestin. We hypothesized that intracerebroventricular administration of TRV027 would ameliorate the effects of DOCA-salt. In a neuronal cell line, TRV027 induced AT1aR internalization through dynamin and clathrin-mediated endocytosis. We next evaluated the effect of chronic intracerebroventricular infusion of TRV027 on fluid intake. We measured the relative intake of water versus various saline solutions using a 2-bottle choice paradigm in mice subjected to DOCA with a concomitant intracerebroventricular infusion of either vehicle, TRV027, or losartan. Sham mice received intracerebroventricular vehicle without DOCA. TRV027 potentiated DOCA-induced water intake in the presence or absence of saline. TRV027 and losartan both increased the aversion for saline-an effect particularly pronounced for highly aversive saline solutions. Intracerebroventricular Ang (angiotensin) II, but not TRV027, increased water and saline intake in the absence of DOCA. In a separate cohort, blood pressure responses to acute intracerebroventricular injection of vehicle, TRV, or losartan were measured by radiotelemetry in mice with established DOCA-salt hypertension. Central administration of intracerebroventricular TRV027 or losartan each caused a significant and similar reduction of blood pressure and heart rate. We conclude that administration of TRV027 a selective I?-arrestin biased agonist directly into the brain increases aversion to saline and lowers blood pressure in a model of salt-sensitive hypertension. These data suggest that selective activation of AT1R I?-arrestin pathways may be exploitable therapeutically.

Author List

Zanaty M, Seara FAC, Nakagawa P, Deng G, Mathieu NM, Balapattabi K, Karnik SS, Grobe JL, Sigmund CD

Authors

Justin L. Grobe PhD Associate Professor in the Physiology department at Medical College of Wisconsin
Pablo Nakagawa PhD Assistant Professor in the Physiology department at Medical College of Wisconsin
Curt Sigmund PhD Chair, Professor in the Physiology department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Angiotensin II Type 1 Receptor Blockers
Animals
Blood Pressure
Cell Line
Choice Behavior
Desoxycorticosterone
Hypertension
Losartan
Mice
Neurons
Oligopeptides
Receptor, Angiotensin, Type 1
Renin-Angiotensin System
beta-Arrestins