PUBLICATION
Atrium-specific ion channels in the zebrafish-A role of IKACh in atrial repolarization.
- Authors
- Skarsfeldt, M.A., Bomholtz, S.H., Lundegaard, P.R., Lopez-Izquierdo, A., Tristani-Firouzi, M., Bentzen, B.H.
- ID
- ZDB-PUB-180208-9
- Date
- 2018
- Source
- Acta physiologica (Oxford, England) 223(3): e13049 (Journal)
- Registered Authors
- Lundegaard, Pia Rengtved
- Keywords
- ECG, Action Potential, Atrium, Heart, Ion Channel, Zebrafish
- MeSH Terms
-
- Animals
- Electrocardiography
- Heart Atria/metabolism
- Isolated Heart Preparation
- Myocardium/metabolism*
- Patch-Clamp Techniques
- Potassium Channels/analysis
- Potassium Channels/metabolism*
- Zebrafish/metabolism*
- PubMed
- 29412518 Full text @ Acta Physiol. (Oxf).
Citation
Skarsfeldt, M.A., Bomholtz, S.H., Lundegaard, P.R., Lopez-Izquierdo, A., Tristani-Firouzi, M., Bentzen, B.H. (2018) Atrium-specific ion channels in the zebrafish-A role of IKACh in atrial repolarization.. Acta physiologica (Oxford, England). 223(3):e13049.
Abstract
Aim The zebrafish has emerged as a novel model for investigating cardiac physiology and pathology. The aim of this study was to investigate the atrium-specific ion channels responsible for shaping the atrial cardiac action potential in zebrafish.
Methods Using quantitative polymerase chain reaction, we assessed the expression level of atrium-specific potassium channels. The functional role of these channels was studied by patch clamp experiments on isolated atrial and ventricular cardiomyocytes and by optical mapping of explanted adult zebrafish hearts. Finally, surface ECGs were recorded to establish possible in vivo roles of atrial ion channels.
Results In isolated adult zebrafish hearts, we identified the expression of kcnk3, kcnk9, kcnn1, kcnn2, kcnn3, kcnj3 and kcnj5, the genes that encode the atrium-specific K2P , KCa 2.x and Kir 3.1/4 (KACh ) ion channels. The electrophysiological data indicate that the acetylcholine-activated inward-rectifying current, IKACh, plays a major role in the zebrafish atrium, whereas K2P 3.1/9.1 and KCa 2.x channels do not appear to be involved in regulating the action potential in the zebrafish heart.
Conclusion We demonstrate that the acetylcholine-activated inward-rectifying current (IKACh ) current plays a major role in the zebrafish atrium and that the zebrafish could potentially be a cost-effective and reliable model for pharmacological testing of atrium-specific IKACh modulating compounds.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping