Increased vulnerability to atrial fibrillation in transgenic mice with selective atrial fibrosis caused by overexpression of TGF-β1

Sander Verheule, Toshiaki Sat, Thomas Everett, Steven K. Engle, Dan Otten, Michael Rubart-von der Lohe, Hisako O. Nakajima, Hidehiro Nakajima, Loren Field, Jeffrey E. Olgin

Research output: Contribution to journalArticle

352 Citations (Scopus)

Abstract

Studies on patients and large animal models suggest the importance of atrial fibrosis in the development of atrial fibrillation (AF). To investigate whether increased fibrosis is sufficient to produce a substrate for AF, we have studied cardiac electrophysiology (EP) and inducibility of atrial arrhythmias in MHC-TGFcys33ser transgenic mice (Tx), which have increased fibrosis in the atrium but not in the ventricles. In anesthetized mice, wild-type (Wt) and Tx did not show significant differences in surface ECG parameters. With transesophageal atrial pacing, no significant differences were observed in EP parameters, except for a significant decrease in corrected sinus node recovery time in Tx mice. Burst pacing induced AF in 14 of 29 Tx mice, whereas AF was not induced in Wt littermates (P<0.01). In Langendorff perfused hearts, atrial conduction was studied using a 16-electrode array. Epicardial conduction velocity was significantly decreased in the Tx RA compared with the Wt RA. In the Tx LA, conduction velocity was not significantly different from Wt, but conduction was more heterogeneous. Action potential characteristics recorded with intracellular microelectrodes did not reveal differences between Wt and Tx mice in either atrium. Thus, in this transgenic mouse model, selective atrial fibrosis is sufficient to increase AF inducibility.

Original languageEnglish
Pages (from-to)1458-1465
Number of pages8
JournalCirculation Research
Volume94
Issue number11
DOIs
StatePublished - Jun 11 2004

Fingerprint

Atrial Fibrillation
Transgenic Mice
Fibrosis
Cardiac Electrophysiology
Sinoatrial Node
Electrophysiology
Microelectrodes
Action Potentials
Cardiac Arrhythmias
Electrocardiography
Electrodes
Animal Models

Keywords

  • Atrial fibrillation
  • Fibrosis
  • Growth factors

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Increased vulnerability to atrial fibrillation in transgenic mice with selective atrial fibrosis caused by overexpression of TGF-β1. / Verheule, Sander; Sat, Toshiaki; Everett, Thomas; Engle, Steven K.; Otten, Dan; Rubart-von der Lohe, Michael; Nakajima, Hisako O.; Nakajima, Hidehiro; Field, Loren; Olgin, Jeffrey E.

In: Circulation Research, Vol. 94, No. 11, 11.06.2004, p. 1458-1465.

Research output: Contribution to journalArticle

Verheule, Sander ; Sat, Toshiaki ; Everett, Thomas ; Engle, Steven K. ; Otten, Dan ; Rubart-von der Lohe, Michael ; Nakajima, Hisako O. ; Nakajima, Hidehiro ; Field, Loren ; Olgin, Jeffrey E. / Increased vulnerability to atrial fibrillation in transgenic mice with selective atrial fibrosis caused by overexpression of TGF-β1. In: Circulation Research. 2004 ; Vol. 94, No. 11. pp. 1458-1465.
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