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Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents
10:53

Isolation of Human Atrial Myocytes for Simultaneous Measurements of Ca2+ Transients and Membrane Currents

Published on: July 3, 2013

Difference of sodium currents between pediatric and adult human atrial myocytes: evidence for developmental changes

Benzhi Cai1, Xiaoqin Mu, Dongmei Gong

  • 1Department 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.

International Journal of Biological Sciences
|June 8, 2011
PubMed

Insights

Human atrial sodium currents show significant age-related differences. Peak sodium current amplitude is larger in adults, with faster activation and inactivation, indicating developmental changes in these crucial cardiac ion channels.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Developmental Biology

Background:

  • Voltage-gated calcium and potassium currents exhibit developmental changes in cardiomyocytes.
  • Limited data exists on developmental changes in sodium currents within human atrial cells.

Purpose of the Study:

  • To investigate age-related alterations in sodium currents of human atrial myocytes.
  • To compare sodium current characteristics between pediatric and adult atrial cells.

Main Methods:

  • Human atrial myocytes were isolated.
  • Whole-cell patch clamp technique was employed to record sodium currents.
  • Comparison of sodium current properties between pediatric and adult samples.

Main Results:

  • Adult atrial cells displayed significantly larger peak sodium current amplitude compared to pediatric cells.
  • Time constants for activation and inactivation were smaller in adult atrial myocytes.
  • Voltage-dependent inactivation and recovery from inactivation showed significant differences between age groups.

Conclusions:

  • Sodium currents in human atria undergo significant developmental changes from pediatric to adult stages.
  • These findings highlight age-dependent modifications in cardiac electrical properties.

Keywords:
cardiomocytes.patch clamppostnatal developmentsodium channel

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