Asymmetrical distribution of ion channels in canine and human left-ventricular wall: epicardium versus midmyocardium View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2005-06-11

AUTHORS

Gergely Szabó, Norbert Szentandrássy, Tamás Bíró, Balázs I. Tóth, Gabriella Czifra, János Magyar, Tamás Bányász, András Varró, László Kovács, Péter P. Nánási

ABSTRACT

The aim of the present study was to compare the distribution of ion currents and the major underlying ion channel proteins in canine and human subepicardial (EPI) and midmyocardial (MID) left-ventricular muscle. Ion currents and action potentials were recorded from canine cardiomyocytes derived from the very superficial EPI and central MID regions of the left ventricle. Amplitude, duration and the maximum velocity of depolarization of the action potential were significantly greater in MID than EPI myocytes, whereas phase-1 repolarization was more pronounced in the EPI cells. Amplitudes of the transient outwards K+ current (29.5±1.5 vs. 19.0±2.3 pA/pF at +50 mV) and the slow component of the delayed rectifier K+ current (10.3±2.3 vs. 6.5±1.0 pA/pF at +50 mV) were significantly larger in EPI than in MID myocytes under whole-cell voltage-clamp conditions. The densities of the inwards rectifier K+ current, rapid delayed rectifier K+ current and L-type Ca2+ current were similar in both cell types. Expression of channel proteins in both canine and human ventricular myocardium was determined by Western blotting. In the canine heart, the expression of Kv4.3, Kv1.4, KChIP2 and KvLQT1 was significantly higher, and that of Nav1.5 and MinK much lower, in EPI than in MID. No significant EPI-MID differences were observed in the expression of the other channel proteins studied (Kir2.1, α1C, HERG and MiRP1). Similar results were obtained in human hearts, although the HERG was more abundant in the EPI than in the MID layer. In the canine heart, the EPI-MID differences in ion current densities were proportional to differences in channel protein expression. Except for the density of HERG, the pattern of EPI-MID distribution of ion-channel proteins was identical in canine and human ventricles. More... »

PAGES

307-316

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00424-005-1445-z

DOI

http://dx.doi.org/10.1007/s00424-005-1445-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028069154

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15952036


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101 protein expression
102 rectifier
103 region
104 repolarization
105 results
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107 similar results
108 slow component
109 study
110 subepicardial
111 superficial EPI
112 transient outward
113 type Ca2
114 types
115 velocity
116 ventricle
117 ventricular myocardium
118 voltage-clamp conditions
119 wall
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