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Updated: Jan 1, 2026

Quantitative Real-Time Polymerase Chain Reaction Evaluation of MicroRNA Expression in Kidney and Serum of Mice with Age-Dependent Renal Impairment

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Aging Impairs Renal Autoregulation in Mice.

Jin Wei¹, Jinxiu Zhu², Jie Zhang¹

¹From the Department of Molecular Pharmacology and Physiology, Morsani College of Medicine (J.W., J. Zhang, S.J., L.Q., L.W., R.L.), University of South Florida, Tampa.

Hypertension (Dallas, Tex. : 1979)

|December 17, 2019

Summary

Aging impairs kidney autoregulation, leading to increased blood pressure transmission and potential kidney damage. This study found blunted myogenic responses and inhibited tubuloglomerular feedback in aged kidneys, linked to reduced integrin α5 and adenosine A1 receptor expression.

Keywords:

aging hemodynamics myogenic response renal autoregulation tubuloglomerular feedback

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Area of Science:

Nephrology
Physiology
Aging Research

Background:

Impaired renal autoregulation exacerbates kidney damage by transmitting systemic blood pressure fluctuations.
Aging is suspected to attenuate renal autoregulation, but direct evidence is lacking.

Purpose of the Study:

To investigate the impact of aging on renal blood flow autoregulation, myogenic response, and tubuloglomerular feedback in mice.
To elucidate the molecular mechanisms underlying age-related changes in renal autoregulation.

Main Methods:

In vivo and in vitro assessment of renal blood flow autoregulation, afferent arteriole myogenic response, and tubuloglomerular feedback in young and aged mice.
Micropuncture techniques and isolated perfused juxtaglomerular apparatus were utilized.
Expression levels of integrin α5 (Itga5) and adenosine A1 receptor (A1AR) were analyzed.

Main Results:

Aged mice exhibited impaired renal blood flow autoregulation, with increased renal blood flow upon elevated renal arterial pressure, unlike young mice.
The myogenic response of the afferent arteriole was significantly blunted in aged kidneys, associated with reduced intracellular calcium signaling and Itga5 expression.
Tubuloglomerular feedback was nearly inactive in aged kidneys, linked to decreased A1AR expression and blunted adenosine responsiveness.

Conclusions:

Aging significantly impairs renal autoregulation, characterized by a blunted myogenic response and inhibited tubuloglomerular feedback.
Downregulation of integrin α5 and adenosine A1 receptor in afferent arterioles are key mechanisms contributing to age-related renal autoregulatory dysfunction.