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Cardiovascular Drugs and Therapy
Published in: Cardiovascular Drugs and Therapy 3/2015

Open Access 01-06-2015 | ORIGINAL ARTICLE

Valsartan Upregulates Kir2.1 in Rats Suffering from Myocardial Infarction via Casein Kinase 2

Authors: Xinran Li, Hesheng Hu, Ye Wang, Mei Xue, Xiaolu Li, Wenjuan Cheng, Yongli Xuan, Jie Yin, Na Yang, Suhua Yan

Published in: Cardiovascular Drugs and Therapy | Issue 3/2015

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Abstract

Purpose

Myocardial infarction (MI) results in an increased susceptibility to ventricular arrhythmias, due in part to decreased inward-rectifier K+ current (IK1), which is mediated primarily by the Kir2.1 protein. The use of renin-angiotensin-aldosterone system antagonists is associated with a reduced incidence of ventricular arrhythmias. Casein kinase 2 (CK2) binds and phosphorylates SP1, a transcription factor of KCNJ2 that encodes Kir2.1. Whether valsartan represses CK2 activation to ameliorate IK1 remodeling following MI remains unclear.

Methods

Wistar rats suffering from MI received either valsartan or saline for 7 days. The protein levels of CK2 and Kir2.1 were each detected via a Western blot analysis. The mRNA levels of CK2 and Kir2.1 were each examined via quantitative real-time PCR.

Results

CK2 expression was higher at the infarct border; and was accompanied by a depressed IK1/Kir2.1 protein level. Additionally, CK2 overexpression suppressed KCNJ2/Kir2.1 expression. By contrast, CK2 inhibition enhanced KCNJ2/Kir2.1 expression, establishing that CK2 regulates KCNJ2 expression. Among the rats suffering from MI, valsartan reduced CK2 expression and increased Kir2.1 expression compared with the rats that received saline treatment. In vitro, hypoxia increased CK2 expression and valsartan inhibited CK2 expression. The over-expression of CK2 in cells treated with valsartan abrogated its beneficial effect on KCNJ2/Kir2.1.

Conclusions

AT1 receptor antagonist valsartan reduces CK2 activation, increases Kir2.1 expression and thereby ameliorates IK1 remodeling after MI in the rat model.
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Metadata
Title
Valsartan Upregulates Kir2.1 in Rats Suffering from Myocardial Infarction via Casein Kinase 2
Authors
Xinran Li
Hesheng Hu
Ye Wang
Mei Xue
Xiaolu Li
Wenjuan Cheng
Yongli Xuan
Jie Yin
Na Yang
Suhua Yan
Publication date
01-06-2015
Publisher
Springer US
Published in
Cardiovascular Drugs and Therapy / Issue 3/2015
Print ISSN: 0920-3206
Electronic ISSN: 1573-7241
DOI
https://doi.org/10.1007/s10557-015-6598-1

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