PUBLICATION
Inward rectifier potassium current (I K1) and Kir2 composition of the zebrafish (Danio rerio) heart
- Authors
- Hassinen, M., Haverinen, J., Hardy, M.E., Shiels, H.A., Vornanen, M.
- ID
- ZDB-PUB-150521-7
- Date
- 2015
- Source
- Pflugers Archiv : European journal of physiology 467(12): 2437-46 (Journal)
- Registered Authors
- Keywords
- Zebrafish, Heart, Inward rectifier potassium current, Kir2 channel
- MeSH Terms
-
- Potassium Channels, Inwardly Rectifying/chemistry
- Potassium Channels, Inwardly Rectifying/genetics
- Potassium Channels, Inwardly Rectifying/metabolism*
- Cells, Cultured
- Molecular Sequence Data
- Myocytes, Cardiac/metabolism*
- Myocytes, Cardiac/physiology
- Heart Atria/cytology
- Action Potentials*
- Heart Ventricles/cytology
- Humans
- Potassium Channel Blockers/pharmacology
- Zebrafish
- Animals
- Protein Multimerization*
- Barium/pharmacology
- Amino Acid Sequence
- Protein Subunits/chemistry
- Protein Subunits/genetics
- Protein Subunits/metabolism
- Zebrafish Proteins/chemistry
- Zebrafish Proteins/genetics
- Zebrafish Proteins/metabolism*
- HEK293 Cells
- PubMed
- 25991088 Full text @ Pflügers Archiv. / Eur. J. Physiol.
Citation
Hassinen, M., Haverinen, J., Hardy, M.E., Shiels, H.A., Vornanen, M. (2015) Inward rectifier potassium current (I K1) and Kir2 composition of the zebrafish (Danio rerio) heart. Pflugers Archiv : European journal of physiology. 467(12):2437-46.
Abstract
Electrophysiological properties and molecular background of the zebrafish (Danio rerio) cardiac inward rectifier current (IK1) were examined. Ventricular myocytes of zebrafish have a robust (-6.7 ± 1.2 pA pF(-1) at -120 mV) strongly rectifying and Ba(2+)-sensitive (IC50 = 3.8 μM) IK1. Transcripts of six Kir2 channels (drKir2.1a, drKir2.1b, drKir2.2a, drKir2.2b, drKir2.3, and drKir2.4) were expressed in the zebrafish heart. drKir2.4 and drKir2.2a were the dominant isoforms in both the ventricle (92.9 ± 1.5 and 6.3 ± 1.5 %) and the atrium (28.9 ± 2.9 and 64.7 ± 3.0 %). The remaining four channels comprised together less than 1 and 7 % of the total transcripts in ventricle and atrium, respectively. The four main gene products (drKir2.1a, drKir2.2a, drKir2.2b, drKir2.4) were cloned, sequenced, and expressed in HEK cells for electrophysiological characterization. drKir2.1a was the most weakly rectifying (passed more outward current) and drKir2.2b the most strongly rectifying (passed less outward current) channel, whilst drKir2.2a and drKir2.4 were intermediate between the two. In regard to sensitivity to Ba(2+) block, drKir2.4 was the most sensitive (IC50 = 1.8 μM) and drKir2.1a the least sensitive channel (IC50 = 132 μM). These findings indicate that the Kir2 isoform composition of the zebrafish heart markedly differs from that of mammalian hearts. Furthermore orthologous Kir2 channels (Kir2.1 and Kir2.4) of zebrafish and mammals show striking differences in Ba(2+)-sensitivity. Structural and functional differences needs to be taken into account when zebrafish is used as a model for human cardiac electrophysiology, cardiac diseases, and in screening cardioactive substances.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping