Gap junctional intercellular communicationexchange of small molecules and ions between contiguous cells through membranous gap junctional channelsis essential for growth control and tissue homecotasis. This work conce...Gap junctional intercellular communicationexchange of small molecules and ions between contiguous cells through membranous gap junctional channelsis essential for growth control and tissue homecotasis. This work concerns the functional expression of gap junction protein connexin 43 (Cx43) in normal human lung cells and the changes in lung carcinoma cells. By. using Northern blot hybridization analysis and Cx43 immunocytochemical methods, it was otherved that cultured normal human embryonic lung cells expressed a high level of Cx43 in both mRNA and protein levels.The Cx43 immunofluorescence was localized at cell membrane regions corresponding to the location of gap junctions. These normal lung cells were competent of intercellular communication function as detected by Lucifer yellow dye transfer. In contrast to normal celis, Cx43 mRNA and protein was not detectable in the carcinoma PG cell line. These tumor cells were defective of intercellular communication function. These results demonstrate that Cx43 is expressed in normal cultured human embryonic lung cells but not in lung tumor cells. The lack of intercellular communication in the lung tumor cell line correlates with dysfunctional intercellular communication. The suggestive role of Cx as a tumor suppersor gene is discussed.展开更多
目的探讨电针足三里穴促胃动力作用机制。方法采用电生理学方法同步观察电针不同穴位后胃电的变化;采用免疫组化荧光双重标记胃电起搏区Cajal间质细胞(interstitial cells of cajal,ICCs)与缝隙连接蛋白43(CX43)、ICCs与ERK的方法 ,观...目的探讨电针足三里穴促胃动力作用机制。方法采用电生理学方法同步观察电针不同穴位后胃电的变化;采用免疫组化荧光双重标记胃电起搏区Cajal间质细胞(interstitial cells of cajal,ICCs)与缝隙连接蛋白43(CX43)、ICCs与ERK的方法 ,观察针刺足三里穴引起胃电起搏区ICCs的变化、与ICCs信息传递相关的CX43的变化、丝裂原活化蛋白激酶(MAPK)家族中的ERK的变化情况。结果电针足三里穴对胃电有明显影响。电针足三里穴可使胃电频率及波幅增高;电针足三里穴可显著激活胃ICCs表达及与ICCs信息传递密切相关的CX43的表达;电针足三里穴能促进胃ICCs调节胃运动的细胞信号转导的MAPK途径中ERK的表达。结论电针足三里穴对大鼠胃电具有明显的促进作用;电针足三里穴促进胃运动的机制可能通过激活ICCs而产生显著电生理活动,通过ICCs及SMC之间的缝隙连接蛋白传递达到平滑肌进而调节胃运动。这一作用的完成,可能是通过ICCs信号转导MAPK途径中ERK通路实现的。展开更多
文摘Gap junctional intercellular communicationexchange of small molecules and ions between contiguous cells through membranous gap junctional channelsis essential for growth control and tissue homecotasis. This work concerns the functional expression of gap junction protein connexin 43 (Cx43) in normal human lung cells and the changes in lung carcinoma cells. By. using Northern blot hybridization analysis and Cx43 immunocytochemical methods, it was otherved that cultured normal human embryonic lung cells expressed a high level of Cx43 in both mRNA and protein levels.The Cx43 immunofluorescence was localized at cell membrane regions corresponding to the location of gap junctions. These normal lung cells were competent of intercellular communication function as detected by Lucifer yellow dye transfer. In contrast to normal celis, Cx43 mRNA and protein was not detectable in the carcinoma PG cell line. These tumor cells were defective of intercellular communication function. These results demonstrate that Cx43 is expressed in normal cultured human embryonic lung cells but not in lung tumor cells. The lack of intercellular communication in the lung tumor cell line correlates with dysfunctional intercellular communication. The suggestive role of Cx as a tumor suppersor gene is discussed.
文摘目的探讨电针足三里穴促胃动力作用机制。方法采用电生理学方法同步观察电针不同穴位后胃电的变化;采用免疫组化荧光双重标记胃电起搏区Cajal间质细胞(interstitial cells of cajal,ICCs)与缝隙连接蛋白43(CX43)、ICCs与ERK的方法 ,观察针刺足三里穴引起胃电起搏区ICCs的变化、与ICCs信息传递相关的CX43的变化、丝裂原活化蛋白激酶(MAPK)家族中的ERK的变化情况。结果电针足三里穴对胃电有明显影响。电针足三里穴可使胃电频率及波幅增高;电针足三里穴可显著激活胃ICCs表达及与ICCs信息传递密切相关的CX43的表达;电针足三里穴能促进胃ICCs调节胃运动的细胞信号转导的MAPK途径中ERK的表达。结论电针足三里穴对大鼠胃电具有明显的促进作用;电针足三里穴促进胃运动的机制可能通过激活ICCs而产生显著电生理活动,通过ICCs及SMC之间的缝隙连接蛋白传递达到平滑肌进而调节胃运动。这一作用的完成,可能是通过ICCs信号转导MAPK途径中ERK通路实现的。