Identification and characterization of a transient outward K+ current in human induced pluripotent stem cell-derived cardiomyocytes.

ABSTRACT:

Background

The ability to recapitulate mature adult phenotypes is critical to the development of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CM) as models of disease. The present study examines the characteristics of the transient outward current (Ito) and its contribution to the hiPSC-CM action potential (AP).

Method

Embryoid bodies were made from a hiPS cell line reprogrammed with Oct4, Nanog, Lin28 and Sox2. Sharp microelectrodes were used to record APs from beating-clusters (BC) and patch-clamp techniques were used to record Ito in single hiPSC-CM. mRNA levels of Kv1.4, KChIP2 and Kv4.3 were quantified from BCs.

Results

BCs exhibited spontaneous beating (60.5±2.6 bpm) and maximum-diastolic-potential (MDP) of 67.8±0.8 mV (n=155). A small 4-ami

SUBMITTER: Cordeiro JM 

PROVIDER: S-EPMC3779808 | biostudies-literature | 2013 Jul

REPOSITORIES: biostudies-literature