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Related Experiment Video

Updated: Jun 19, 2026

Electromechanical Assessment of Optogenetically Modulated Cardiomyocyte Activity

Electromechanical Assessment of Optogenetically Modulated Cardiomyocyte Activity

Published on: March 5, 2020

Ion channel transcript expression at the rabbit atrioventricular conduction axis.

Ian D Greener¹, James O Tellez, Halina Dobrzynski

¹Faculty of Medical and Human Sciences, University of Manchester, Manchester, United Kingdom.

Circulation. Arrhythmia and Electrophysiology

|October 8, 2009

Summary

This summary is machine-generated.

The atrioventricular node has specialized gap junctions and ion channels. This distribution in the nodal extension, transitional zone, and penetrating bundle correlates with the region's specific electrophysiology.

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Area of Science:

Cardiovascular Physiology
Molecular Cardiology
Cardiac Electrophysiology

Background:

The distribution of gap junctions and ion channels in the atrioventricular (AV) node is largely unknown.
Understanding these proteins is crucial as they dictate AV node physiology and pathology.

Purpose of the Study:

To investigate the expression patterns of gap junctions, ion channels, and Ca(2+)-handling proteins within distinct regions of the rabbit AV node.
To correlate these molecular findings with the known electrophysiological properties of the AV node.

Main Methods:

Quantitative polymerase chain reaction (qPCR) was used to measure transcript abundance.
In situ hybridization was employed to localize specific protein expression within the AV node architecture.

Main Results:

The nodal extension (slow pathway) showed high expression of Ca(v)1.3 and HCN4, and reduced expression of Cx43, Na(v)1.5, Ca(v)1.2, K(v)1.4, KChIP2, and RYR3, similar to the sinoatrial node.
A transitional zone within the penetrating bundle exhibited reduced expression of Cx43, Na(v)1.5, and KChIP2, suggesting a potential fast pathway.
The penetrating bundle displayed a less specialized expression profile.

Conclusions:

The AV node exhibits specialized and heterogeneous expression of gap junctions and ion channels.
These molecular differences in the nodal extension (slow pathway), transitional zone (putative fast pathway), and penetrating bundle (output pathway) align with the electrophysiological characteristics of each region.