成年大鼠心室肌细胞表达多种电压门控钠通道α亚型

目的观察成年大鼠心室肌细胞上电压门控钠通道不同亚型的表达情况。方法采用酶解消化法分离成年大鼠心室肌细胞,利用免疫荧光染色结合激光共聚焦技术检测心室肌细胞钠通道α亚型Nav1.1、Nav1.2、Nav1.3、Nav1.5、Nav1.6、Nav1.7的表达及分布情况,采用全细胞膜片钳技术记录心室肌细胞钠电流。结果成年大鼠心室肌细胞除表达心脏型钠通道亚型Nav1.5之外,还表达神经型钠通道亚型Nav1.1、Nav1.6和Nav1.7,不表达Nav1.2和Nav1.3。Nav1.5分布于横小管周围,Nav1.1和Nav1.7亦呈点状分布于横小管区域。Nav1.6表达稍弱,沿心室肌细胞长轴纵向分布,闰盘...

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Published in西安交通大学学报（医学版） Vol. 38; no. 6; pp. 796 - 802
Main Author 杜媛 罗玲 李涛 席雨涛 马爱群 王亭忠
Format Journal Article
LanguageChinese
Published 西安交通大学第一附属医院心血管内科,陕西省分子心脏病学重点实验室,环境与疾病相关教育部重点实验室,陕西西安 710061 2017
Subjects
亚型
心室肌细胞
快钠电流
晚钠电流
电压门控钠通道
晚钠电流
T
快钠电流
电压门控钠通道
亚型
ventricular myocyte
subunit
I Na
心室肌细胞
voltage-gated sodium channel
L
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ISSN1671-8259
DOI10.7652/jdyxb201706004

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Summary:目的观察成年大鼠心室肌细胞上电压门控钠通道不同亚型的表达情况。方法采用酶解消化法分离成年大鼠心室肌细胞,利用免疫荧光染色结合激光共聚焦技术检测心室肌细胞钠通道α亚型Nav1.1、Nav1.2、Nav1.3、Nav1.5、Nav1.6、Nav1.7的表达及分布情况,采用全细胞膜片钳技术记录心室肌细胞钠电流。结果成年大鼠心室肌细胞除表达心脏型钠通道亚型Nav1.5之外,还表达神经型钠通道亚型Nav1.1、Nav1.6和Nav1.7,不表达Nav1.2和Nav1.3。Nav1.5分布于横小管周围,Nav1.1和Nav1.7亦呈点状分布于横小管区域。Nav1.6表达稍弱,沿心室肌细胞长轴纵向分布,闰盘处未见钠通道各α亚型的表达。膜片钳结果显示成年大鼠心室肌细胞表达快钠电流（INa,T）及晚钠电流（INa,L）。结论成年大鼠心室肌细胞表达心脏型钠通道亚型（Nav1.5）和多种神经型钠通道亚型（Nav1.1、Nav1.6和Nav1.7）,这可能有助于维持心肌细胞的正常电生理活动。
Bibliography:DU Yuan, LUO Ling, LI Tao, XI Yu tao, MA Ai-qun, WANG Ting-zhong （Department of Cardiovascular Medicine, the First Affiliated Hospital of Xi＇an Jiaotong University; Key Laboratory of Molecular Cardiology of Shaanxi Province; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi＇an Jiaotong University, Xi＇an 710061, China）
Objective To observe the expressions of voltage-gated sodium channel（NaCh）αsubunits in adult rat ventricular myocytes.Methods Single ventricular myocytes were isolated from adult rat heart.Expressions of variousαsubunits（Nav1.1,Nav1.2,Nav1.3,Nav1.5,Nav1.6 and Nav1.7）of NaCh in the ventricular myocytes were detected by immunocytochemistry staining.Sodium current was recorded by whole-cell patch clamp method.Results The neuronal subunits Nav1.1,Nav1.6 and Nav1.7 as well as the cardiac subunit Nav1.5 of NaCh were expressed in adult rat ventricular myocytes.Nav1.1,Nav1.5 and Nav1.7 were distributed along the cell membrane of the ventricular myocytes and around the
ISSN:1671-8259
DOI:10.7652/jdyxb201706004