Difference of Sodium Currents between Pediatric and Adult Human Atrial Myocytes: Evidence for Developmental Changes of Sodium Channels

被引：12

作者：

Cai, Benzhi ^{[1
]}

Mu, Xiaoqin ^{[1
]}

Gong, Dongmei ^{[1
]}

Jiang, Shulin ^{[3
]}

Li, Jianping ^{[1
]}

Meng, Qingxin ^{[3
]}

Bai, Yunlong ^{[1
]}

Liu, Yanju ^{[1
]}

Wang, Xinyue ^{[1
]}

Tan, Xueying ^{[1
]}

Yang, Baofeng ^{[1
,2
]}

Lu, Yanjie ^{[1
,2
]}

机构：

[1] Harbin Med Coll, Dept Pharmacol, State Prov Key Labs Biomed Pharmaceut China, Key Lab Cardiovasc Res,Minst Educ, Harbin 150081, Peoples R China

[2] Harbin Med Coll, Cardiovasc Res Inst, Harbin 150081, Peoples R China

[3] Harbin Med Coll, Affiliated Hosp 2, Dept Cardiosurg, Harbin 150081, Peoples R China

来源：

INTERNATIONAL JOURNAL OF BIOLOGICAL SCIENCES | 2011年 / 7卷 / 06期

关键词：

sodium channel; postnatal development; patch clamp; cardiomocytes; TRANSIENT OUTWARD CURRENT; RAT VENTRICULAR MYOCYTES; POSTNATAL-DEVELOPMENT; MOUSE; CELLS; K+; CARDIOMYOCYTES; MECHANISMS; EXPRESSION; HEART;

D O I：

10.7150/ijbs.7.708

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Voltage-gated calcium currents and potassium currents were shown to undergo developmental changes in postnatal human and animal cardiomocytes. However, so far, there is no evidence whether sodium currents also presented the developmental changes in postnatal human atrial cells. The aim of this study was to observe age-related changes of sodium currents between pediatric and adult atrial myocytes. Human atrial myocytes were acutely isolated and the whole-cell patch clamp technique was used to record sodium currents isolated from pediatric and adult atrial cardiomocytes. The peak amplitude of sodium currents recorded in adult atrial cells was significantly larger than that in pediatric atrial myocytes. However, there was no significant difference of the activation voltage for peak sodium currents between two kinds of atrial myocytes. The time constants for the activation and inactivation of sodium currents were smaller in adult atria than pediatric atria. The further study revealed that the voltage-dependent inactivation of sodium currents were more slow in adult atrial cardiomyocytes than pediatric atrial cells. A significant difference was also observed in the recovery process of sodium channel from inactivation. In summary, a few significant differences were demonstrated in sodium currents characteristics between pediatric and adult atrial myocytes, which indicates that sodium currents in human atria also undergo developmental changes.

引用

页码：708 / 714

页数：7

共 26 条

[1] Cardiac sodium channel Nav1.5 and interacting proteins: Physiology and pathophysiology [J].