Bone Marrow Mononuclear Stem Cells Transplanted in Rat Infarct Myocardium Improved the Electrical Conduction without Evidence of Proarrhythmic Effects.
10.3349/ymj.2007.48.5.754
- Author:
Boyoung JOUNG
1
;
Il Kwon KIM
;
Moon Hyoung LEE
;
Kyung Jong YOO
;
Sung Soon KIM
Author Information
1. Division of Cardiology, Yonsei Cardiovascular Center and Research Institute, Yonsei University College of Medicine, Seoul, Korea. mhlee@yuhs.ac
- Publication Type:Original Article ; In Vitro ; Research Support, Non-U.S. Gov't
- Keywords:
Arrhythmogenicity;
stem cell;
optical mapping
- MeSH:
Action Potentials;
Animals;
Arrhythmias, Cardiac/*etiology;
Bone Marrow Transplantation/*adverse effects;
Disease Models, Animal;
Electric Conductivity;
Heart Ventricles/pathology/transplantation;
Hematopoietic Stem Cell Transplantation/*adverse effects;
Myocardial Infarction/pathology/*surgery;
Rats;
Rats, Sprague-Dawley
- From:Yonsei Medical Journal
2007;48(5):754-764
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The arrhythmogenic effect of stem cells transplantation (SCT) in an infarct myocardium is still unknown. We investigated arrhythmogenicity of SCT in rat cryo-infarct model. MATERIALS AND METHODS: In rat cryo-infarct model, bone marrow mononuclear stem cells (MNSC, 1 x 10(7) cells) were transplanted into the infarct border zone (BZ) of the LV epicardium. We compared the optical mapping and inducibility of ventricular tachycardia/fibrillation (VT/VF) among normal (n=5), cryo-infarct (n=6), and SCT rats (n=6). RESULTS: The VT/VF inducibility was higher in the cryo- infarct (47.2%, p=0.001) and SCT groups (34.6%, p=0.01) than in the normal group (12.8%). The induced VT/VF episodes persisted for more than 2 minutes in 4.3%, 26.4% and 17.3% in the normal, cryo-infarct and SCT group, respectively. In the SCT group, the action potential duration at 70% was shorter at the SCT site than the BZ during SR (75.2 +/- 8.1 vs. 145.6 +/- 4.4 ms, p=0.001) and VT (78.2 +/- 13.0 vs. 125.7 +/- 21.0 ms, p= 0.001). Conduction block was observed at the SCT site and BZ during VT. However, no reentry or ectopic foci were observed around the SCT sites. CONCLUSION: The electrical conduction was improved by SCT without evidence of augmentation of arrhythmia in the rat cryo-infarct model.
