MicroRNA Biophysically Modulates Cardiac Action Potential by Direct Binding to Ion Channel.

ABSTRACT:

Background

MicroRNAs (miRs) play critical roles in regulation of numerous biological events, including cardiac electrophysiology and arrhythmia, through a canonical RNA interference mechanism. It remains unknown whether endogenous miRs modulate physiologic homeostasis of the heart through noncanonical mechanisms.

Methods

We focused on the predominant miR of the heart (miR1) and investigated whether miR1 could physically bind with ion channels in cardiomyocytes by electrophoretic mobility shift assay, in situ proximity ligation assay, RNA pull down, and RNA immunoprecipitation assays. The functional modulations of cellular electrophysiology were evaluated by inside-out and whole-cell patch clamp. Mutagenesis of miR1 and the ion channel was used to understand the underlying me

SUBMITTER: Yang D 

PROVIDER: S-EPMC8132313 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature