Electrophysiological characteristics of cardiomyocyte-like cells from rat bone marrow derived mesenchymal stem cells by four inductors / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Bone marrow derived mesenchymal stem cells (BMdMSCs) can differentiate into cardiomyocyte-like cells induced by different inductors individually or collectively. In this study, by inducing BMdMSCs with p53 inhibitor (p-fifty three inhibitor-alpha, PFT-α), 5-azacytidine (5-AZA), angiotensin-II (Ang-II) and bone morphogenic protein-2 (BMP-2) we compared the influences of four inductors on the differentiation of rat BMdMSCs into caridomyocyte like-cells.</p><p><b>METHODS</b>BMdMSCs were collected from the bone marrow of Sprague Dawley rats and after the fourth generation, the purified cells were divided into five groups: 5-AZA (10 µmol/L), Ang-II (0.1 µmol/L), PFT-α (20 µmol/L), BMP-2 (10 µg/L) and control. The purity of the BMdMSCs and the cardiac differentiation rates were obtained by flow cytometry. The expressions of cTnT in the BMdMSCs after four weeks of induction were detected by immunofluorescence and the expressions of cTnI and Cx43 detected by Western blotting. The green fluorescent levels reflecting intracellular calcium transient function were determined by laser scanning confocal microscopy. The total potassium current levels of cells were measured on patch clamp.</p><p><b>RESULTS</b>All inductors affected to a different degree the differentiation of BMdMSCs into cardiomyocyte-like cells and the expressions of cTnT, cTnI and Cx43 suggesting that the combination of inductors could be an improved method for cardiac regenerative medicine. In addition, the total potassium current level and calcium transient in PFT-α cardiomyocyte-like cells were higher than other groups.</p><p><b>CONCLUSIONS</b>The cardiac differentiation of BMdMSCs induced by PFT-α, 5-AZA, Ang-II and BMP-2 has been improved at different levels. PFT-α has an advantage of differentiation rate and electrophysiological function over other inductors.</p>

Cardiac differentiation and electrophysiology characteristics of bone marrow mesenchymal stem cells / 中华医学杂志(英文版)

<p><b>OBJECTIVE</b>To review the progress of cardiac differentiation and electrophysiological characteristics of bone marrow mesenchymal stem cells.</p><p><b>DATA SOURCES</b>The databases of PubMed, Springer Link, Science Direct and CNKI were retrieved for papers published from January 2000 to January 2012 with the key words of "bone marrow mesenchymal stem cells, cardiac or heart, electrophysiology or electrophysiological characteristics".</p><p><b>STUDY SELECTION</b>The articles concerned cardiac differentiation and electrophysiological characteristics of bone marrow mesenchymal stem cells were collected. After excluding papers that study purposes are not coincident with this review or contents duplicated, 56 papers were internalized at last.</p><p><b>RESULTS</b>For the treatment of myocardial infarction and myocardiac disease, the therapeutic effects of transplantation of bone marrow mesenchymal stem cells which have the ability to develop into functional myocardial cells by lots of methods have been proved by many researches. But the arrhythmogenic effect on ventricles after transplantation of bone marrow mesenchymal stem cells derived myocardial cells is still controversial in animal models. Certainly, the low differentiation efficiency and heterogeneous development of electrical function could be the most important risk for proarrhythmia.</p><p><b>CONCLUSION</b>Many studies of cardiac differentiation of bone marrow mesenchymal stem cells have paid attention to improve the cardiac differentiation rate, and the electrophysiology characteristics of the differentiated cells should be concerned for the risk for proarrhythmia as well.</p>