title: Bone marrow mesenchymal stem cells upregulate transient outward potassium currents in postnatal rat ventricular myocytes.
abstract: Bone marrow mesenchymal stem cell (BMSC) transplantation has been shown to effectively improve cardiac function in experimental animals and patients with myocardial infarction and heart hypertrophy. BMSCs exert potent effects on cardiomyocytes through the inhibition of cardiac apoptosis, the attenuation of cardiac inflammation, etc. However, novel biological actions of BMSCs on cardiomyocytes remain to be explored. The present study was designed to investigate whether BMSCs affect electrophysiological features of neonatal rat ventricular myocytes (NRVMs). BMSCs and NRVMs were indirectly co-cultured at a ratio of 1:10 with a semi-permeable membrane. We found that compared with mono-cultured NRVMs, co-cultured NRVMs exhibited an obvious increase of transient outward potassium current (I(to)), accompanied by significant changes in activation, inactivation and recovery of I(to). Meanwhile, K(V)4.2 mRNA which encodes the channel carrying I(to) was more abundant in co-cultured NRVMs than mono-cultured NRVMs. The increases in basic fibroblast growth factor (bFGF) and insulin growth factor-1 (IGF-1) levels were observed in culture medium of BMSCs. bFGF but not IGF-1 upregulated the K(V)4.2 mRNA expression and enhanced I(to) currents. Taken together, we conclude that BMSCs upregulate I(to) of NRVMs, at least partially, by secreting bFGF that in turn upregulates K(V)4.2 expression and alters the kinetics of I(to).
authors.affiliation: Department of Pharmacology and the State-Province Key Laboratory of Biomedicine and Pharmaceutics, Harbin Medical University, Baojian Road 157, Nangang District, Harbin, Heilongjiang Province 150081, PR China.
authors.forename: Cai
authors.initials: C
authors.lastname: Benzhi
authors.forename: Zhao
authors.initials: Z
authors.lastname: Limei
authors.forename: Wang
authors.initials: W
authors.lastname: Ning
authors.forename: Liu
authors.initials: L
authors.lastname: Jiaqi
authors.forename: Zhu
authors.initials: Z
authors.lastname: Songling
authors.forename: Meng
authors.initials: M
authors.lastname: Fanyu
authors.forename: Zhou
authors.initials: Z
authors.lastname: Hongyu
authors.forename: Lu
authors.initials: L
authors.lastname: Yanjie
authors.forename: Ai
authors.initials: A
authors.lastname: Jing
authors.forename: Yang
authors.initials: Y
authors.lastname: Baofeng
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001854:Bone Marrow Cells / Q000166:cytology / Q000502:physiology*; D002478:Cells, Cultured; D018920:Coculture Techniques; D004594:Electrophysiology; D004797:Enzyme-Linked Immunosorbent Assay; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism; D006352:Heart Ventricles / Q000166:cytology*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000502:physiology*; D032383:Myocytes, Cardiac / Q000166:cytology* / Q000378:metabolism*; D018408:Patch-Clamp Techniques; D011188:Potassium / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051672:Shal Potassium Channels / Q000235:genetics
chemical_list: D051672:Shal Potassium Channels; D016222:Fibroblast Growth Factor 2; D007334:Insulin-Like Growth Factor I; D011188:Potassium