Activation of Notch1 signaling by marrow-derived mesenchymal stem cells through cell-cell contact inhibits proliferation of hepatic stellate cells

被引:51
作者
Chen, Si [1 ,2 ]
Xu, Linan [3 ]
Lin, Nan [1 ]
Pan, Weidong [1 ]
Hu, Kunpeng [1 ]
Xu, Ruiyun [1 ]
机构
[1] Sun Yat Sen Univ, Affiliated Hosp 3, Dept Hepatobiliary Surg, Guangzhou 510630, Guangdong, Peoples R China
[2] Anhui Med Univ, Anhui Prov Hosp, Dept Gastroenterol, Hefei 230032, Peoples R China
[3] Sun Yat Sen Univ, Affiliated Hosp 1, Guangzhou 510089, Guangdong, Peoples R China
基金
美国国家科学基金会;
关键词
Hepatic stellate cells; Mesenchymal stem cells; Direct coculture; Notch pathway; Proliferation; LIVER FIBROSIS; GROWTH-FACTOR; IN-VIVO;
D O I
10.1016/j.lfs.2011.10.012
中图分类号
R-3 [医学研究方法]; R3 [基础医学];
学科分类号
1001 ;
摘要
Aims: Bone marrow-derived mesenchymal stem cells (BMSCs) have been reported in many studies to reduce liver fibrosis. Apart from the paracrine mechanism by which the antifibrotic effects of BMSCs inhibit activated hepatic stellate cells (HSCs), the effects of direct interplay and juxtacrine signaling between the two cell types are poorly understood. The purpose of this study was to explore the underlying mechanisms by which BMSCs modulate the function of activated HSCs. Main methods: We show here that BMSCs directly cocultured with HSCs significantly suppressed the proliferation and a-smooth muscle actin (alpha-SMA) expression of HSCs. Moreover, the Notch1 and Hes1 mRNA levels and the Hes1 protein level in cocultured HSCs were evidently higher than in other models. Blocking the Notch signaling pathway with Notch1 siRNA caused the increased expression of phospho-Akt and greater cell growth of cocultured HSCs. This effect was attenuated by the PI3K inhibitor LY294002. Key findings: In conclusion, our results demonstrated that BMSCs remarkably inhibited the proliferation of HSCs through a cell-cell contact mode that was partially mediated by Notch pathway activation. In addition, the PI3K/Akt pathway is involved in HSC growth inhibition by the Notch pathway. Significance: These findings demonstrated that BMSCs directly modulate HSCs in vitro via Notch signaling cascades. Our results may provide new insights into the treatment of hepatic fibrosis with BMSCs. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:975 / 981
页数:7
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