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Related Experiment Video

Updated: Nov 24, 2025

Exploring Arterial Smooth Muscle Kv7 Potassium Channel Function using Patch Clamp Electrophysiology and Pressure Myography

Exploring Arterial Smooth Muscle Kv7 Potassium Channel Function using Patch Clamp Electrophysiology and Pressure Myography

Published on: September 14, 2012

K_V7 Channel Expression and Function Within Rat Mesenteric Endothelial Cells.

Samuel N Baldwin¹, Shaun L Sandow², Gema Mondéjar-Parreño³

¹Vascular Biology Research Centre, Institute of Molecular and Clinical Sciences, St George's University of London, London, United Kingdom.

Frontiers in Physiology

|December 28, 2020

Summary

This study reveals KCNQ-encoded K_V7 channels, specifically K_V7.4 and K_V7.5, are functionally expressed in rat mesenteric artery endothelial cells (ECs). These channels contribute to nitric oxide release and vascular control.

Keywords:

KIR channel KV7 channel carbachol endothelial cell pharmacology vascular biology

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Last Updated: Nov 24, 2025

Exploring Arterial Smooth Muscle Kv7 Potassium Channel Function using Patch Clamp Electrophysiology and Pressure Myography

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Published on: September 14, 2012

Rat Mesentery Exteriorization: A Model for Investigating the Cellular Dynamics Involved in Angiogenesis

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Published on: May 20, 2012

Isolation of Microvascular Endothelial Tubes from Mouse Resistance Arteries

Isolation of Microvascular Endothelial Tubes from Mouse Resistance Arteries

Published on: November 25, 2013

Area of Science:

Vascular biology
Ion channel physiology
Endothelial cell function

Background:

Arterial diameter is regulated by vascular smooth muscle cells (VSMCs) and endothelial cells (ECs).
KCNQ-encoded K_V7 channels influence arterial diameter and are known in VSMCs, but their presence in ECs was undefined.
ECs expressing K_V7 channels could represent a novel vascular control mechanism.

Purpose of the Study:

To characterize the expression and function of K_V7 channels in rat mesenteric artery ECs.
To investigate the role of EC K_V7 channels in vascular reactivity and nitric oxide (NO) release.

Main Methods:

RT-qPCR and immunocytochemistry for KCNQ transcript and K_V7 protein expression in isolated ECs and VSMCs.
Immunohistochemistry and immunoelectron microscopy on whole vessels.
Wire myography to assess vascular reactivity to K_V7 modulators and NO donors.

Main Results:

KCNQ transcript and K_V7.1, K_V7.4, K_V7.5 proteins were detected in rat mesenteric artery ECs and VSMCs.
Endothelium removal attenuated vasorelaxation to K_V7 activators, indicating an EC-dependent process.
K_V7 channel inhibition impaired NO-mediated vasorelaxation, suggesting involvement in endogenous NO production.

Conclusions:

K_V7.4 and K_V7.5 channels are expressed and functional in rat mesenteric artery ECs.
These channels interact with endothelial K_IR2.x channels and contribute to eNOS-mediated relaxation.
K_V7 channels represent novel players in endothelial function and NO release in mesenteric arteries.