Relationship between local production of microRNA-328 and atrial substrate remodeling in atrial fibrillation

• Published in: Journal of cardiology Vol. 68; no. 6; pp. 472 - 477
• Main Authors: Soeki, Takeshi, MD, PhD, FJCC, Matsuura, Tomomi, MD, Bando, Sachiko, MD, Tobiume, Takeshi, MD, Uematsu, Etsuko, PhD, Ise, Takayuki, MD, PhD, Kusunose, Kenya, MD, PhD, Yamaguchi, Koji, MD, PhD, Yagi, Shusuke, MD, PhD, Fukuda, Daiju, MD, PhD, Yamada, Hirotsugu, MD, PhD, FJCC, Wakatsuki, Tetsuzo, MD, PhD, Shimabukuro, Michio, MD, PhD, Sata, Masataka, MD, PhD, FJCC
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Ltd 01.12.2016
• Subjects: Aged; Atrial Appendage - metabolism; Atrial fibrillation; Atrial Fibrillation - physiopathology; Atrial Remodeling - physiology; Cardiovascular; Case-Control Studies; Echocardiography; Electrophysiologic Techniques, Cardiac; Female; Heart Atria - diagnostic imaging; Humans; Left atrium; Male; MicroRNA; MicroRNAs - blood; Middle Aged; Pulmonary Veins - metabolism; Remodeling; Substrate; Substrate; MicroRNA; Left atrium; Remodeling; Atrial fibrillation
• ISSN: 0914-5087; 1876-4738
• DOI: 10.1016/j.jjcc.2015.12.007

Abstract Background The underlying mechanism of atrial substrate remodeling in atrial fibrillation (AF) remains unknown. In this study, we investigated whether local and systemic levels of microRNA (miR) might be associated with the presence of AF and with left atrial (LA) substrate properties. Methods Blood from the periphery, pulmonary vein (PV), and left atrial appendage (LAA) was sampled from 30 patients with AF undergoing PV isolation, and from 10 control subjects with Wolff-Parkinson-White syndrome and without AF. We measured peripheral, PV, and LAA plasma levels of miR-1, -26, -133a, -328, and -590 by reverse transcription-polymerase chain reaction. LA global contact mapping during sinus rhythm was performed before PV isolation. Results Plasma levels of miR-328 were higher in patients with AF than in control subjects. Plasma miR-328 levels were significantly higher in the LAA than in the periphery and PV in patients with AF, but not in control subjects. Plasma miR-1 levels were also higher in the LAA than in the PV in AF patients. Interestingly, LAA plasma levels of miR-328 showed a positive correlation with the LA voltage zone index (area with voltage <0.5 mV divided by total LA surface area) and a weak correlation with LA volume. Conclusion Local production of miR-328 in the left atrium may be involved in the process of atrial remodeling in patients with AF.