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Up-regulation of miR-21 and miR-23a Contributes to As2 O3 -induced hERG Channel Deficiency.

Abstract：

:Arsenic trioxide (As2O3) is used to treat acute pro-myelocytic leukaemia. However, the cardiotoxicity of long QT syndrome restricts its clinical application. Previous studies showed that As2O3 can damage the hERG current via disturbing its trafficking to cellular membrane. Consistent with these findings, in this study, we reported that As2O3 inhibited hERG channel at both protein and mRNA levels and damaged hERG current but did not affect channel kinetics. Further, we demonstrated that As2O3 up-regulated miR-21 and miR-23a expression in hERG-HEK293 cells and neonatal cardiomyocytes. In addition, knock-down of miR-21 by its specific antisense molecules AMO-21 was able to rescue Sp1 and hERG inhibition caused by As2O3. Consistently, phosphorylation of NF-κB, the upstream regulatory factor of miR-21, was significantly up-regulated by As2O3 . This finding revealed that regulation of the NF-κB-miR-21-Sp1 signalling pathway is a novel mechanism for As2O3-induced hERG inhibition. Meanwhile, the expression of Hsp90 and hERG was rescued by transfection with AMO-23a. And the hERG channel inhibition induced by As2O3 was rescued after being transfected with AMO-23a, which may be a molecular mechanism for the role of As2O3 in hERG trafficking deficiency. In brief, our study revealed that miR-21 and miR-23a are involved in As2O3-induced hERG deficiency at transcriptional and transportational levels. This discovery may provide a novel mechanism of As2O3-induced hERG channel deficiency, and these miRNAs may serve as potential therapeutic targets for the handling of As2O3 cardiotoxicity.

journal_name

Basic Clin Pharmacol Toxicol

journal_title

Basic & clinical pharmacology & toxicology

authors

Zhao X,Shi YQ,Yan CC,Feng PF,Wang X,Zhang R,Zhang X,Li BX

doi

10.1111/bcpt.12348

subject

Has Abstract

pub_date

2015-06-01 00:00:00

pages

516-23

issue

6

eissn

1742-7835

issn

1742-7843

journal_volume

116

pub_type

杂志文章

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