Journal
HYPERTENSION
Volume 79, Issue 11, Pages 2480-2492Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/HYPERTENSIONAHA.122.19863
Keywords
angiotensin; arrestin; blood pressure; homeostasis; hypertension
Categories
Funding
- National Institutes of Health [HL084207, HL144807, HL134850, HL153101]
- American Heart Association [18EIA33890055, 22PRE898004, 22PRE903246]
- Children's Research Institute [CRI22700]
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In salt-sensitive hypertension, ARRB2 may counterbalance the canonical signaling of GPCRs, while ARRB1 has no significant effect.
Background: GPCRs (G protein-coupled receptors) are implicated in blood pressure (BP) and fluid intake regulation. There is a developing concept that these effects are mediated by both canonical G protein signaling and noncanonical beta-arrestin mediated signaling, but the contributions of each remain largely unexplored. Here, we hypothesized that beta-arrestin contributes to fluid homeostasis and blood pressure (BP) regulation in deoxycorticosterone acetate (DOCA) salt hypertension, a prototypical model of salt-sensitive hypertension. Methods: Global beta-arrestin1 (Arrb1) and beta-arrestin2 (Arrb2) knockout mice were employed to evaluate drinking behavior, and BP was evaluated in Arrb2-knockout mice. Age- and sex-matched C57BL/6 mice served as controls. We measured intake of water and different sodium chloride solutions and BP employing a 2-bottle choice paradigm with and without DOCA. Results: Without DOCA (baseline), Arrb2-knockout mice exhibited a significant elevation in saline intake with no change in water intake. With DOCA treatment, Arrb2-knockout mice exhibited a significant increase in both saline and water intake. Although Arrb2-knockout mice exhibited hypernatremia at baseline conditions, we did not find significant changes in total body sodium stores or sodium palatability. In a separate cohort, BP was measured via telemetry in Arrb2-knockout and C57BL/6 mice with and without DOCA. Arrb2-knockout did not exhibit significant differences in BP before DOCA treatment when provided water alone, or when provided a choice of water and saline. However, Arrb2-knockout exhibited an increased pressor response to DOCA-salt. Conclusions: These findings suggest that in salt-sensitive hypertension, ARRB2, but not ARRB1 (beta-arrestin 1), might counterbalance the canonical signaling of GPCRs.
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