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Related Experiment Video

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Recording of Inward Rectifying K+ Currents in Freshly Isolated Basilar Artery Smooth Muscle Cells by Patch Clamp Technique

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Endothelial progenitor cells functionally express inward rectifier potassium channels.

Sung-Soo Jang¹, Jonghanne Park, Sung Won Hur

¹Department of Physiology, Seoul National University College of Medicine, Seoul, Korea.

American Journal of Physiology. Cell Physiology

|March 18, 2011

Summary

Endothelial progenitor cells (EPCs) express inward rectifier potassium channels (Kir) that influence their proliferation and tube formation. Blocking these channels with barium or cesium affects EPC function, highlighting Kir channels as potential therapeutic targets in vascular disease.

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High-throughput Screening for Small-molecule Modulators of Inward Rectifier Potassium Channels

High-throughput Screening for Small-molecule Modulators of Inward Rectifier Potassium Channels

Published on: January 27, 2013

Area of Science:

Cardiovascular Biology
Cell Physiology
Molecular Medicine

Background:

Endothelial progenitor cells (EPCs) are crucial for vascular repair.
The electrophysiological properties of EPCs remain largely uncharacterized.
Inward rectifier potassium channels (Kir) are vital for regulating cell membrane potential.

Purpose of the Study:

To investigate the electrophysiological properties of EPCs.
To identify the presence and function of Kir channels in EPCs.
To explore the role of Kir channels in EPC proliferation and vascular function.

Main Methods:

Whole-cell patch-clamp technique to record ionic currents.
Inhibition studies using Kir channel blockers (Ba²⁺, Cs⁺).
Membrane potential assessment using DiBAC(3) fluorescence.
mRNA and protein analysis for Kir channel subtypes.
Functional assays including Matrigel tube formation and cell proliferation.

Main Results:

Inwardly rectifying currents, sensitive to Ba²⁺ and Cs⁺, were detected in EPCs.
Ba²⁺ induced membrane depolarization in EPCs.
Multiple Kir subtypes (Kir2.x, 3.x, 4.x, 6.x) were identified at mRNA and protein levels.
Kir channel inhibition reduced EPC tube formation but increased EPC proliferation.
Specific inhibition of Kir2.1 also enhanced EPC proliferation.

Conclusions:

EPCs express functional inward rectifier potassium channels.
Kir channels play a significant role in modulating EPC proliferation and endothelial function.
Targeting Kir channels may offer a novel therapeutic strategy for vascular diseases.