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Kv7.1 surface expression is regulated by epithelial cell polarization.

Martin N Andersen¹, Søren-Peter Olesen, Hanne B Rasmussen

¹Danish National Research Foundation Centre for Cardiac Arrhythmia, Department of Biomedical Sciences, The Faculty of Health Sciences, University of Copenhagen, Denmark.

American Journal of Physiology. Cell Physiology

|January 14, 2011

Summary

The potassium channel K(V)7.1

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Area of Science:

Cellular Biology
Molecular Biology
Physiology

Background:

The potassium channel K(V)7.1 is crucial for cardiac action potential repolarization and epithelial salt/water transport.
Mutations in the KCNQ1 gene encoding K(V)7.1 are linked to long QT syndrome and deafness, with some identified as trafficking defects.
Understanding K(V)7.1 trafficking is essential for elucidating its role in health and disease.

Purpose of the Study:

To investigate the regulatory mechanisms governing K(V)7.1 surface expression during epithelial cell polarization.
To characterize the dynamic localization of K(V)7.1 in Madin-Darby Canine Kidney (MDCK) cells using a calcium switch model.

Main Methods:

Utilized a modified calcium switch assay in MDCK cells to study K(V)7.1 trafficking.
Observed dynamic changes in K(V)7.1 localization during the polarization process.

Main Results:

K(V)7.1 localization is dynamic, shifting from the plasma membrane to the endoplasmic reticulum (ER) during the initial phase of the calcium switch.
The channel is retained in the ER until lateral membranes form, after which it is released and traffics to the plasma membrane.
Protein kinase C (PKC) activation may mediate K(V)7.1 removal from the surface and ER accumulation, while phosphoinositide 3-kinase (PI3K) activation is involved in its subsequent ER release.

Conclusions:

Epithelial cell polarization involves dynamic regulation of K(V)7.1 surface expression.
Signaling pathways, including those involving PKC and PI3K, play critical roles in controlling K(V)7.1 trafficking and surface availability.
These findings offer insights into the molecular mechanisms underlying K(V)7.1 function and the pathogenesis of related disorders.