...
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Formation of heteromeric gap junction channels by connexins 40 and 43 in vascular smooth muscle cells
【24h】

Formation of heteromeric gap junction channels by connexins 40 and 43 in vascular smooth muscle cells

机译:连接蛋白40和43在血管平滑肌细胞中形成异源间隙连接通道

获取原文
获取原文并翻译 | 示例
           

摘要

Connexin (Cx) 43 and Cx40 are coexpressed in several tissues, including cardiac atrial and ventricular myocytes and vascular smooth muscle. It has been shown that these Cxs form homomeric/homotypic channels with distinct permeability and gating properties but do not form functional homomeric/heterotypic channels. If these Cxs were to form heteromeric channels, they could display functional proper- ties not well predicted by the homomeric forms. We assessed this possibility by using A7r5 cells, an embryonic rat aortic smooth muscle cell line that coexpresses Cxs 43 and 40. Connexons (hemichannels), which were isolated from these cells by density centrifugation and immunoprecipitated with antibody against Cx43, contained Cx40. Similarly, antibody against Cx40 coimmunoprecipitated Cx43 from the same connexon fraction but only Cx40 from Cx (monomer) frac- tions. These results indicate that heteromeric connexons are formed by these Cxs in the A7r5 cells. The gap junction channels formed in the A7r5 cells display many unitary conductances distinct from homomeric/homotypic Cx43 or Cx40 channels. Voltage-dependent gating parameters in the A7r5 cells are also quite variable compared with cells that express only Cx40 or Cx43. These data indicate that Cxs 43 and 40 form functional heteromeric channels with unique gating and conductance properties.
机译:连接蛋白(Cx)43和Cx40在几种组织中共表达,包括心脏心房和心室肌细胞以及血管平滑肌。已经显示出这些Cxs形成具有独特的渗透性和门控性质的同型/同型通道,但是不形成功能性的同型/异型通道。如果这些Cx形成异源通道,它们可能显示出同质异构形式无法很好预测的功能特性。我们通过使用A7r5细胞(一种共表达Cxs 43和40的胚胎大鼠主动脉平滑肌细胞系)来评估这种可能性。通过密度离心从这些细胞中分离并用抗Cx43抗体免疫沉淀的连接子(半通道)包含Cx40。同样,针对Cx40的抗体可从相同的连接子级分共免疫沉淀Cx43,但仅从Cx(单体)级分沉淀Cx40。这些结果表明在A7r5细胞中这些Cxs形成了异源连接体。在A7r5细胞中形成的间隙连接通道显示出许多同质/同型Cx43或Cx40通道不同的单位电导。与仅表达Cx40或Cx43的细胞相比,A7r5细胞中与电压有关的门控参数也存在很大差异。这些数据表明Cx 43和40形成具有独特的门控和电导特性的功能性异聚体通道。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号