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

Li X, Hu H, Wang Y, Xue M, Li X, Cheng W, Xuan Y, Yin J, Yang N, Yan S - Cardiovasc Drugs Ther (2015)

Bottom Line: 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.AT1 receptor antagonist valsartan reduces CK2 activation, increases Kir2.1 expression and thereby ameliorates IK1 remodeling after MI in the rat model.

View Article: PubMed Central - PubMed

Affiliation: School of Medicine, Shandong University, Ji'nan, Shandong, China.

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.

No MeSH data available.


Related in: MedlinePlus

Representative histologic image of the heart stained with Masson’s Trichrome. Myocytes are red and fibrotic tissues are blue. Left: after the sham surgury. Right: after the MI surgury
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Fig1: Representative histologic image of the heart stained with Masson’s Trichrome. Myocytes are red and fibrotic tissues are blue. Left: after the sham surgury. Right: after the MI surgury

Mentions: The heart was rapidly excised, sliced along the edges of the infarction, and dissected along the infarct border. The middle portion included the entirety of the infarcted myocardium and was immersed in 10 % formalin for 24 h, embedded in paraffin, cut into 10-μm sections and stained with Masson’s trichrome (Fig. 1). We sampled the corresponding heart positions in the sham rats.Fig. 1


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

Li X, Hu H, Wang Y, Xue M, Li X, Cheng W, Xuan Y, Yin J, Yang N, Yan S - Cardiovasc Drugs Ther (2015)

Representative histologic image of the heart stained with Masson’s Trichrome. Myocytes are red and fibrotic tissues are blue. Left: after the sham surgury. Right: after the MI surgury
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4522035&req=5

Fig1: Representative histologic image of the heart stained with Masson’s Trichrome. Myocytes are red and fibrotic tissues are blue. Left: after the sham surgury. Right: after the MI surgury
Mentions: The heart was rapidly excised, sliced along the edges of the infarction, and dissected along the infarct border. The middle portion included the entirety of the infarcted myocardium and was immersed in 10 % formalin for 24 h, embedded in paraffin, cut into 10-μm sections and stained with Masson’s trichrome (Fig. 1). We sampled the corresponding heart positions in the sham rats.Fig. 1

Bottom Line: 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.AT1 receptor antagonist valsartan reduces CK2 activation, increases Kir2.1 expression and thereby ameliorates IK1 remodeling after MI in the rat model.

View Article: PubMed Central - PubMed

Affiliation: School of Medicine, Shandong University, Ji'nan, Shandong, China.

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.

No MeSH data available.


Related in: MedlinePlus