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Related Experiment Video

Updated: Jul 14, 2025

Isolation and Functional Analysis of Arteriolar Endothelium of Mouse Brain Parenchyma

Isolation and Functional Analysis of Arteriolar Endothelium of Mouse Brain Parenchyma

Published on: March 11, 2022

Endothelial K_IR2 channel dysfunction in aged cerebral parenchymal arterioles.

Felipe D Polk¹, Md A Hakim², Josiane F Silva³

¹Department of Physiology, University of Arizona, Tucson, Arizona, United States.

American Journal of Physiology. Heart and Circulatory Physiology

|October 6, 2023

Summary

Aging impairs brain arteriole dilation by affecting endothelial inwardly-rectifying K+ channels (KIR2). This dysfunction in the cerebral microcirculation may contribute to cognitive decline, with potential smooth muscle compensation.

Keywords:

aging endothelium-dependent hyperpolarization inwardly-rectifying K+ channel parenchymal arterioles purinergic receptors

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Last Updated: Jul 14, 2025

Isolation and Functional Analysis of Arteriolar Endothelium of Mouse Brain Parenchyma

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Published on: March 11, 2022

Ex Vivo Pressurized Hippocampal Capillary-Parenchymal Arteriole Preparation for Functional Study

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Published on: December 18, 2019

Simultaneous Measurements of Intracellular Calcium and Membrane Potential in Freshly Isolated and Intact Mouse Cerebral Endothelium

Simultaneous Measurements of Intracellular Calcium and Membrane Potential in Freshly Isolated and Intact Mouse Cerebral Endothelium

Published on: January 20, 2019

Area of Science:

Neuroscience
Cardiovascular Science
Aging Research

Background:

Aging is linked to cognitive decline through poorly understood mechanisms.
Cerebral microvascular dysfunction, especially impaired endothelium-mediated dilation, is a hallmark of aging.
Parenchymal arteriole dysfunction disrupts nutrient supply to neurons, increasing their vulnerability.

Purpose of the Study:

To investigate if endothelial purinergic receptor (P2Y) and inwardly-rectifying K+ channel (KIR2) signaling are altered in aged brain parenchymal arterioles.
To test the hypothesis that aging impairs endothelial P2Y and KIR2 function in these vessels.

Main Methods:

Compared vasodilation and endothelial hyperpolarization in parenchymal arterioles from young and aged mice.
Utilized purinergic agonists (2-methyl-S-ADP) and K+ channel activators (NS309, high K+).
Assessed the role of KIR2 channels using specific inhibitors and evaluated myogenic tone.

Main Results:

Aged arterioles showed reduced dilation to 2-methyl-S-ADP, indicating impaired P2Y/KIR2 signaling.
No differences in dilation or hyperpolarization were observed with KCa channel activation.
Aged arterioles exhibited increased myogenic tone and impaired hyperpolarization to high K+, despite paradoxical vasodilation.

Conclusions:

Aging impairs endothelial KIR2 channel function in cerebral parenchymal arterioles.
This dysfunction may contribute to age-related cognitive decline.
Smooth muscle cells might compensate for impaired endothelial function in aged brains.