The Notch γ-secretase inhibitor ameliorates kidney fibrosis via inhibition of TGF-β/Smad2/3 signaling pathway activation

被引:71
作者
Xiao, Zhicheng [1 ]
Zhang, Jing [1 ]
Peng, Xiaogang [1 ]
Dong, Yanjun [1 ]
Jia, Lixin [1 ]
Li, Huihua [2 ]
Du, Jie [1 ]
机构
[1] Capital Med Univ, Beijing Inst Heart Lung & Blood Vessel Dis, Key Lab Remodeling Related Cardiovasc Dis, Minist Educ,Beijing AnZhen Hosp, Beijing, Peoples R China
[2] Capital Med Univ, Dept Physiol & Pathophysiol, Beijing, Peoples R China
基金
中国国家自然科学基金;
关键词
Kidney fibrosis; Epithelial-to-mesenchymal transition; Fibroblast; Notch; TGF-beta; EPITHELIAL-MESENCHYMAL TRANSITION; REGULATED KINASE 1; TGF-BETA/SMAD; DIFFERENTIATION; PROLIFERATION; INFLAMMATION; INDUCTION; CELLS; MICE;
D O I
10.1016/j.biocel.2014.08.009
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Kidney fibrosis is a common feature of chronic kidney disease (CKD). A recent study suggests that abnormal Notch signaling activation contributes to the development of renal fibrosis. However, the molecular mechanism that regulates this process remains unexplored. Unilateral ureteral obstruction (UUO) or sham-operated C57BL6 mice (aged 10 weeks) were randomly assigned to receive dibenzazepine (DBZ, 250 mu g/100 g/d) or vehicle for 7 days. Histologic examinations were performed on the kidneys using Masson's trichrome staining and immunohistochemistry. Real-time PCR and western blot analysis were used for detection of mRNA expression and protein phosphorylation. The expression of Notch 1, 3, and 4, Notch intracellular domain (NICD), and its target genes Hes1 and HeyL were upregulated in UUO mice, while the increase in NICD protein was significantly attenuated by DBZ. After 7 days, the severity of renal fibrosis and expression of fibrotic markers, including collagen 1 alpha 1/3 alpha 1, fibronectin, and a-smooth muscle actin, were markedly increased in UUO compared with sham mice. In contrast, administration of DBZ markedly attenuated these effects. Furthermore, DBZ significantly inhibited UUO-induced expression of transforming growth factor (TGF)-beta, phosphorylated Smad 2, and Smad 3. Mechanistically, Notch signaling activation in tubular epithelial cells enhanced fibroblast proliferation and activation in a coculture experiment. Our study provides evidence that Notch signaling is implicated in renal fibrogenesis. The Notch inhibitor DBZ can ameliorate this process via inhibition of the TGF-beta/Smad2/3 signaling pathway, and might be a novel drug for preventing chronic kidney disease. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:65 / 71
页数:7
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