Soluble (pro)renin receptor: a novel ligand for angiotensin II type 1 receptor?

Area of Science:

• Cardiovascular Science
• Endocrinology
• Molecular Biology

Background:

• The prorenin receptor (PRR) plays a role in cardiovascular regulation.
• The soluble form of PRR (sPRR) is a cleavage product with unknown functions.
• Obesity is linked to hypertension and endothelial dysfunction.

Purpose of the Study:

• To investigate the role of sPRR as a ligand for the angiotensin II type 1 receptor (AT1R).
• To determine if the sPRR/AT1R interaction contributes to obesity-induced hypertension and endothelial dysfunction.

Main Methods:

• In vitro studies using primary human umbilical vein endothelial cells (HUVECs).
• In vivo studies using mice with diet-induced obesity.
• Assessed sPRR interaction with AT1R, NF-κB activation, inflammation, apoptosis, and blood pressure.

Main Results:

• sPRR directly binds to AT1R, activating NF-κB, promoting inflammation and apoptosis in HUVECs.
• The sPRR/AT1R interaction mediates endothelial dysfunction and hypertension in diet-induced obesity mice.
• This interaction provides a mechanism linking obesity to cardiovascular issues.

Conclusions:

• The sPRR/AT1R complex is a key player in obesity-related endothelial dysfunction and hypertension.
• Targeting the sPRR/AT1R complex may offer a novel therapeutic strategy for cardiovascular diseases.
• This study elucidates a new pathway contributing to hypertension in obesity.