BNIP3L promotes cardiac fibrosis in cardiac fibroblasts through [Ca2+]i-TGF-β-Smad2/3 pathway

Autor: Weili Liu, Xinxing Wang, Zhusong Mei, Jingbo Gong, lishuang Huang, Xiujie Gao, Yun Zhao, Jing Ma, Lingjia Qian
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Scientific Reports, Vol 7, Iss 1, Pp 1-13 (2017)
Druh dokumentu: article
ISSN: 2045-2322
DOI: 10.1038/s41598-017-01936-5
Popis: Abstract Fibrosis is an important, structurally damaging event that occurs in pathological cardiac remodeling, leading to cardiac dysfunction. BNIP3L is up-regulated in pressure overload-induced heart failure and has been reported to play an important role in cardiomyocyte apoptosis; however, its involvement in cardiac fibroblasts (CFs) remains unknown. We prove for the first time that the expression of BNIP3L is significantly increased in the CFs of rats undergoing pressure overload-induced heart failure. Furthermore, this increased BNIP3L expression was confirmed in cultured neonatal rat CFs undergoing proliferation and extracellular matrix (ECM) protein over-expression that was induced by norepinephrine (NE). The overexpression or suppression of BNIP3L promoted or inhibited NE-induced proliferation and ECM expression in CFs, respectively. In addition, [Ca2+]i, transforming growth factor beta (TGF-β) and the nuclear accumulation of Smad2/3 were successively increased when BNIP3L was overexpressed and reduced when BNIP3L was inhibited. Furthermore, the down-regulation of TGF-β by TGF-β-siRNA attenuated the increase of BNIP3L-induced fibronectin expression. We also demonstrated that the increase of BNIP3L in CFs was regulated by NE-AR-PKC pathway in vitro and in vivo. These results reveal that BNIP3L is a novel mediator of pressure overload-induced cardiac fibrosis through the [Ca2+]i-TGF-β-Smad2/3 pathway in CFs.
Databáze: Directory of Open Access Journals
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