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Bead Aggregation Assays for the Characterization of Putative Cell Adhesion Molecules
Published on: October 17, 2014
Modulation of human Kv1.5 channel kinetics by N-cadherin
Evgenia Koutsouki1, Rebecca S Lam, Guiscard Seebohm
1Department of Physiology, University of Tübingen, Gmelinstr. 5, D-72076 Tübingen, Germany.
Biochemical and Biophysical Research Communications
|September 18, 2007
Summary
N-cadherin enhances potassium channel Kv1.5 activity, primarily by speeding up recovery from inactivation. This finding suggests N-cadherin
Area of Science:
- Molecular biology
- Cardiovascular physiology
- Ion channel function
Background:
- Potassium voltage-gated channel subfamily A member 1.5 (Kv1.5) is expressed in various tissues, including the heart, where it influences cardiac repolarization.
- Kv1.5 channels colocalize with N-cadherin in cardiac myocytes.
- N-cadherin is known to modulate the activity of other ion channels.
Purpose of the Study:
- To investigate the role of N-cadherin in regulating Kv1.5 channel activity.
- To determine if N-cadherin influences Kv1.5 channel function.
Main Methods:
- Kv1.5 channels were expressed in Xenopus oocytes.
- N-cadherin was coexpressed with Kv1.5 in some oocytes.
- Kv1.5-induced currents were measured and analyzed.
Main Results:
- Coexpression of N-cadherin with Kv1.5 resulted in a 2- to 3-fold increase in Kv1.5-induced current.
- N-cadherin did not significantly alter Kv1.5 channel abundance in the oocyte membrane.
- The increased current was primarily due to accelerated recovery of Kv1.5 channels from inactivation.
Conclusions:
- N-cadherin significantly modifies Kv1.5 channel activity.
- N-cadherin is a novel signaling molecule involved in regulating Kv1.5 channel function.
- This interaction may impact cardiac action potentials and vascular tone.
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