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β 3 -adrenergic receptor activation induces TGFβ1 expression in cardiomyocytes via the PKG/JNK/c-Jun pathway.

Authors :
Xu Z
Wu J
Xin J
Feng Y
Hu G
Shen J
Li M
Zhang Y
Xiao H
Wang L
Source :
Biochemical and biophysical research communications [Biochem Biophys Res Commun] 2018 Sep 03; Vol. 503 (1), pp. 146-151. Date of Electronic Publication: 2018 Jun 06.
Publication Year :
2018

Abstract

In heart failure, the expression of cardiac β <subscript>3</subscript> -adrenergic receptors (β <subscript>3</subscript> -ARs) increases. However, the precise role of β <subscript>3</subscript> -AR signaling within cardiomyocytes remains unclear. Transforming growth factor β1 (TGFβ1) is a crucial cytokine mediating the cardiac remodeling that plays a causal role in the progression of heart failure. Here, we set out to determine the effect of β <subscript>3</subscript> -AR activation on TGFβ1 expression in rat cardiomyocytes and examine the underlying mechanism. The selective β <subscript>3</subscript> -AR agonist BRL37344 induced an increase in TGFβ1 expression and the phosphorylation of c-Jun N-terminal kinase (JNK) and c-Jun in β <subscript>3</subscript> -AR-overexpressing cardiomyocytes. Those effects of BRL37344 were suppressed by a β <subscript>3</subscript> -AR antagonist. Moreover, the inhibition of JNK and c-Jun activity by a JNK inhibitor and c-Jun siRNA blocked the increase in TGFβ1 expression upon β <subscript>3</subscript> -AR activation. A protein kinase G (PKG) inhibitor also attenuated β <subscript>3</subscript> -AR-agonist-induced TGFβ1 expression and the phosphorylation of JNK and c-Jun. In conclusion, the β <subscript>3</subscript> -AR activation in cardiomyocytes increases the expression of TGFβ1 via the PKG/JNK/c-Jun pathway. These results help us further understand the role of β <subscript>3</subscript> -AR signaling in heart failure.<br /> (Copyright © 2018 Elsevier Inc. All rights reserved.)

Details

Language :
English
ISSN :
1090-2104
Volume :
503
Issue :
1
Database :
MEDLINE
Journal :
Biochemical and biophysical research communications
Publication Type :
Academic Journal
Accession number :
29859189
Full Text :
https://doi.org/10.1016/j.bbrc.2018.05.200