Connexin 43 hemichannel regulates H9c2 cell proliferation by modulating intracellular ATP and [Ca^2＋]  

作　　者：Dongli Song Xiaoyu Liu Rujiao Liu Ling Yang Ji Zuo Wen Liu 

机构地区：[1]Department of Cellular and Genetic Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, China

出　　处：《Acta Biochimica et Biophysica Sinica》2010年第7期472-482,共11页生物化学与生物物理学报（英文版）

摘　　要：Connexin 43 （Cx43）, known to be the main protein building blocks of gap junctions and hemichannels in mammalian heart, plays an important role in cardiocytes proliferation. Gap junctional intercellular communication has been suggested to be necessary for cellular proliferation and differentiation. However, the effect of Cx43 hemichannel on cardiocytes proliferation and the mechanism remain unclear. In this study, rat heart cell line H9c2 was used. The Cx43 location, the proliferation rate and hemichannel activity of H9c2 cells and Wnt-3a^＋-H9c2 cells were investigated and the changes of intraceilular ATP and [Ca^2＋] were determined. Results showed that the inhibited hemichannel induced by 18β-glycyrrhetinic acid （GA） evoked intracellular ATP and [Ca^2＋] increase and enhanced H9c2 cell proliferation. Wnt-3a＋-H9c2 cells displayed enhanced hemichannel activity and proliferation rate. Inhibited hemichannel of Wnt-3a＋-H9c2 cells induced by 18β-GA decreased intracellular ATP, increased [Ca^2＋], and enhanced the proliferation of H9c2 cells. This study validated the role of hemichannel in H9c2 cell proliferation regulation, and showed a mechanism involved in the regulation of H9c2 cell proliferation. The proliferation could be enhanced by Cx43 hemichannel-mediated ATP release accompanying intraceilular [Ca^2＋]change. However, different changes of ATP were observed in Wnt-3a＋-H9c2 cells. These findings provided new insights into the molecular mechanisms of proliferation regulation in H9c2 cells and the effect of Wnt-3a on intraceliular ATP.Connexin 43 （Cx43）, known to be the main protein building blocks of gap junctions and hemichannels in mammalian heart, plays an important role in cardiocytes proliferation. Gap junctional intercellular communication has been suggested to be necessary for cellular proliferation and differentiation. However, the effect of Cx43 hemichannel on cardiocytes proliferation and the mechanism remain unclear. In this study, rat heart cell line H9c2 was used. The Cx43 location, the proliferation rate and hemichannel activity of H9c2 cells and Wnt-3a^＋-H9c2 cells were investigated and the changes of intraceilular ATP and [Ca^2＋] were determined. Results showed that the inhibited hemichannel induced by 18β-glycyrrhetinic acid （GA） evoked intracellular ATP and [Ca^2＋] increase and enhanced H9c2 cell proliferation. Wnt-3a＋-H9c2 cells displayed enhanced hemichannel activity and proliferation rate. Inhibited hemichannel of Wnt-3a＋-H9c2 cells induced by 18β-GA decreased intracellular ATP, increased [Ca^2＋], and enhanced the proliferation of H9c2 cells. This study validated the role of hemichannel in H9c2 cell proliferation regulation, and showed a mechanism involved in the regulation of H9c2 cell proliferation. The proliferation could be enhanced by Cx43 hemichannel-mediated ATP release accompanying intraceilular [Ca^2＋]change. However, different changes of ATP were observed in Wnt-3a＋-H9c2 cells. These findings provided new insights into the molecular mechanisms of proliferation regulation in H9c2 cells and the effect of Wnt-3a on intraceliular ATP.

关 键 词：Wnt-3a connexin 43 H9c2 cell hernichannel PROLIFERATION 

分 类 号：Q253[生物学—细胞生物学] Q51