title: Difference of sodium currents between pediatric and adult human atrial myocytes: evidence for developmental changes of sodium channels.
abstract: 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.
authors.affiliation: Department of Pharmacology, the State-Province Key Laboratory of Biomedicine, Ministry of Education, Harbin Medical University, and Department of Cardiosurgery, Second Affiliated Hospital of Harbin Medical University, Harbin 150081, China.
authors.forename: Benzhi
authors.initials: B
authors.lastname: Cai
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Mu
authors.forename: Dongmei
authors.initials: D
authors.lastname: Gong
authors.forename: Shulin
authors.initials: S
authors.lastname: Jiang
authors.forename: Jianping
authors.initials: J
authors.lastname: Li
authors.forename: Qingxin
authors.initials: Q
authors.lastname: Meng
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Bai
authors.forename: Yanju
authors.initials: Y
authors.lastname: Liu
authors.forename: Xinyue
authors.initials: X
authors.lastname: Wang
authors.forename: Xueying
authors.initials: X
authors.lastname: Tan
authors.forename: Baofeng
authors.initials: B
authors.lastname: Yang
authors.forename: Yanjie
authors.initials: Y
authors.lastname: Lu
mesh_terms: D000328:Adult; D000375:Aging / Q000378:metabolism*; D002478:Cells, Cultured; D002675:Child, Preschool; D006321:Heart / Q000254:growth & development*; D006325:Heart Atria / Q000254:growth & development / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D032383:Myocytes, Cardiac / Q000378:metabolism*; D018408:Patch-Clamp Techniques; D015222:Sodium Channels / Q000378:metabolism*
chemical_list: D015222:Sodium Channels