Decreased intercellular coupling improves the function of cardiac pacemakers derived from mouse embryonic stem cells.
Decreased intercellular coupling improves the function of cardiac pacemakers derived from mouse embryonic stem cells.
复制标题
细胞间耦合的减少改善了源自小鼠胚胎干细胞的心脏起搏器的功能。
DOI:
10.1016/j.yjmcc.2008.08.013
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发表时间:
2008
影响因子:
5
通讯作者:
Banach,Kathrin
中科院分区:
文献类型:
--
作者:
Fahrenbach,JohnP;Ai,Xun;Banach,Kathrin
The aim of this study was to determine if embryonic stem cell derived cardiomyocyte aggregates (ESdCs) can act as pacemakers in spontaneously active cardiomyocyte preparations when their connexin isoform expression is tuned toward a more sinus nodal phenotype. Using microelectrode array recordings (MEAs), we demonstrate that mouse ESdCs establish electrical coupling with spontaneously active cardiomyocyte preparations (HL-1 monolayer) and obtain pacemaker dominance. WT- and Cx43(−/−)-ESdCs comparably established intercellular coupling with cardiac host tissue (Cx43(−/−): 86% vs. WT: 91%). Although both aggregates had a 100% success rate in pacing quiescent cardiac preparations, Cx43(−/−)-ESdCs had an increased likelihood of gaining pacemaker dominance (Cx43(−/−): 40% vs. WT: 13%) in spontaneously active preparations. No differences in size, beating frequency, Vm, or differentiation were detected between WT- and Cx43(−/−)-ESdCs but the intercellular coupling resistance in Cx43(−/−)-ESdCs was significantly increased (Cx43(−/−): 1.2nS vs. WT: 14.8nS). Lack of Cx43 prolonged the time until Cx43(−/−)-ESdCs established frequency synchronization with the host tissue. It further hampered the excitation spread from the cardiomyocyte preparation into the ESdC. However rectifying excitation spread in these co-cultures could not be unequivocally identified. In summary, ESdCs can function as dominant biological pacemakers and Cx43 expression is not a prerequisite for their electrical integration. Maintenance of pacemaker dominance depends critically on the pacemaker's gap junction expression benefiting those with increased intercellular coupling resistances. Our results provide important insight into the design of biological pacemakers that will benefit the use of cardiomyocytes for cell replacement therapy.
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影响因子:
20.1
作者:
Valiunas, V;Weingart, R;Brink, PR
通讯作者:
Brink, PR
影响因子:
--
作者:
Jüyrgen Hescheler;M. Wartenberg;B. Fleischmann;K. Banach;H. Acker;H. Sauer
通讯作者:
Jüyrgen Hescheler;M. Wartenberg;B. Fleischmann;K. Banach;H. Acker;H. Sauer
DOI:
--
发表时间:
--
期刊:
--
影响因子:
--
作者:
Biochemistr;Biochemistr And Biochemistry;M. Halbach;U. Egert;J. Hescheler;K. Banach
通讯作者:
Biochemistr;Biochemistr And Biochemistry;M. Halbach;U. Egert;J. Hescheler;K. Banach
影响因子:
--
作者:
Marjan van Kerrebroeck;A. V. van Ginneken;Ingrid de Grijs;Nancy A M Mutsaers;T. Opthof;H. Jongsma;M. V. D. van der Heyden
通讯作者:
M. V. D. van der Heyden
DOI:
10.1152/ajpheart.2001.281.4.h1675
发表时间:
2001-10-01
影响因子:
4.8
作者:
Valiunas, V;Gemel, J;Beyer, EC
通讯作者:
Beyer, EC