Effect of verapamil on tachycardia-induced early cellular electrical remodeling in rabbit atrium.

Effect of verapamil on tachycardia-induced early cellular electrical remodeling in rabbit atrium. Research Abstract Details 

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Effect of verapamil on tachycardia-induced early cellular electrical remodeling in rabbit atrium. Abstract Text:

Roman Laszlo,Christoph Winkler,Stefan ,Ralf E Wessel,Sara Laszlo,Mathias C Busch, Schreieck,Ralph F Bosch,Roman Laszlo,Christoph Winkler,Stefan ,Ralf E Wessel,Sara Laszlo,Mathias C Busch, Schreieck,Ralph F Bosch,Roman Laszlo,Christoph Winkler,Stefan ,Ralf E Wessel,Sara Laszlo,Mathias C Busch, Schreieck,Ralph F Bosch,Roman Laszlo,Christoph Winkler,Stefan Wöhrl,Ralf E Wessel,Sara Laszlo,Mathias C Busch,Jürgen Schreieck,Ralph F Bosch,

We investigated the effects of a 7-day verapamil pretreatment (VPT, 7.5 mg/kg bodyweight subcutaneously every 12 h) on ionic currents and molecular mechanisms underlying tachycardia-induced early electrical remodeling after 24-h rapid atrial pacing (RAP, 600 bpm) in rabbit atrium. Animals were divided into four groups (n = 6 each group): control (not paced, no verapamil), paced only, verapamil only and verapamil and paced, respectively. VPT doubled ICa,L [7.0 +/- 0.7 pA/pF (control) vs 14.2 +/- 0.6 pA/pF (verapamil only)]. RAP reduced ICa,L by 48% to 3.6 +/- 0.7 pA/pF (paced only). RAP did not affect ICa,L in verapamil-treated animals and averaged 15.3 +/- 0.2 pA/pF (paced and verapamil). RAP resulted in a significant decrease of the expression of the alpha1c subunit (-24.7%) and the beta2A subunit (-13.3%), respectively. VPT led to a similar alteration of subunit expression as RAP ["control" vs "verapamil only", decrease of alpha1c subunit (-25.4%), but no significant change in beta2A subunit expression]. However, after VPT, further diminishment of alpha1c and beta2A subunit expression after rapid atrial pacing was absent. ("verapamil" vs "verapamil and paced", n = 6 both groups). RAP decreased Ito [-45%, 51.5 +/- 3.9 pA/pF (control) vs 26.8 +/- 1.5 pA/pF (paced only)] and was not influenceable by VPT. IK1 was neither affected by RAP nor verapamil pretreatment. Downregulation of alpha1c and beta2A subunit expression and the resulting decay of ICa,L current densities were prevented by verapamil. However, these effects are abolished by multiple other adverse effects of verapamil on atrial electrophysiology.

Effect of verapamil on tachycardia-induced early cellular electrical remodeling in rabbit atrium. Publishing Authors By Initials

R Laszlo,C Winkler,S ,RE Wessel,S Laszlo,MC Busch,J Schreieck,RF Bosch,R Laszlo,C Winkler,S ,RE Wessel,S Laszlo,MC Busch,J Schreieck,RF Bosch,R Laszlo,C Winkler,S ,RE Wessel,S Laszlo,MC Busch,J Schreieck,RF Bosch,R Laszlo,C Winkler,S Wöhrl,RE Wessel,S Laszlo,MC Busch,J Schreieck,RF Bosch,

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Effect of verapamil on tachycardia-induced early cellular electrical remodeling in rabbit atrium. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Naunyn-Schmiedeberg's archives of pharmacology

VOLUME: 376

Page Numbers: 231-40

Journal Abbreviation: Naunyn Schmiedebergs Arch. Pha

ISSN: 0028-1298

DAY: 15

MONTH: 09

YEAR: 2007

Effect of verapamil on tachycardia-induced early cellular electrical remodeling in rabbit atrium. Information

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LANGUAGE: eng

NlmUniqueID: 326264

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AFFILIATION: Department of Cardiology, University of Tübingen, Otfried-Müller-Strasse 10, 72076, Tübingen, Germany, roman.laszlo@med.uni-tuebingen.de.

Country: Germany

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MEDLINETA: Naunyn Schmiedebergs Arch Phar

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