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Published in: Current Hypertension Reports 1/2019

01-01-2019 | Amiloride | Mechanisms of Hypertension and Target-Organ Damage (Matthew Weir, Section Editor)

A Novel Mechanism of Renal Microcirculation Regulation: Connecting Tubule-Glomerular Feedback

Authors: Cesar A. Romero, Oscar A. Carretero

Published in: Current Hypertension Reports | Issue 1/2019

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Abstract

Purpose of Review

In this review, we summarized the current knowledge of connecting tubule-glomerular feedback (CTGF), a novel mechanism of renal microcirculation regulation that integrates sodium handling in the connecting tubule (CNT) with kidney hemodynamics.

Recent Findings

Connecting tubule-glomerular feedback is a crosstalk communication between the CNT and the afferent arteriole (Af-Art), initiated by sodium chloride through the epithelial sodium channel (ENaC). High sodium in the CNT induces Af-Art vasodilation, increasing glomerular pressure and the glomerular filtration rate and favoring sodium excretion. CTGF antagonized and reset tubuloglomerular feedback and thus increased sodium excretion. CTGF is absent in spontaneous hypertensive rats and is overactivated in Dahl salt-sensitive rats. CTGF is also modulated by angiotensin II and aldosterone.

Summary

CTGF is a feedback mechanism that integrates sodium handling in the CNT with glomerular hemodynamics. Lack of CTGF could promote hypertension, and CTGF overactivation may favor glomerular damage and proteinuria. More studies are needed to explore the alterations in renal microcirculation and the role of these alterations in the genesis of hypertension and glomerular damage in animals and humans.

Key Points

CTGF is a vasodilator mechanism that regulates afferent arteriole resistance.
CTGF is absent in spontaneous hypertensive rats and overactivated in Dahl salt-sensitive rats.
CTGF in excess may promote glomerular damage and proteinuria, while the absence may participate in sodium retention and hypertension.
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Metadata
Title
A Novel Mechanism of Renal Microcirculation Regulation: Connecting Tubule-Glomerular Feedback
Authors
Cesar A. Romero
Oscar A. Carretero
Publication date
01-01-2019
Publisher
Springer US
Published in
Current Hypertension Reports / Issue 1/2019
Print ISSN: 1522-6417
Electronic ISSN: 1534-3111
DOI
https://doi.org/10.1007/s11906-019-0911-5

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