Notch1 signaling pathway promotes invasion, self-renewal and growth of glioma initiating cells via modulating chemokine system CXCL12/CXCR4

被引:98
|
作者
Yi, Li [1 ,2 ]
Zhou, Xingchen [3 ]
Li, Tao [1 ,2 ]
Liu, Peidong [1 ,2 ]
Hai, Long [4 ]
Tong, Luqing [1 ,2 ]
Ma, Haiwen [1 ,2 ]
Tao, Zhennan [1 ,2 ]
Xie, Yang [1 ,2 ]
Zhang, Chen [5 ]
Yu, Shengping [1 ,2 ]
Yang, Xuejun [1 ,2 ]
机构
[1] Tianjin Med Univ Gen Hosp, Dept Neurosurg, Tianjin 300052, Peoples R China
[2] Tianjin Neurol Inst, Lab Neurooncol, Tianjin 300052, Peoples R China
[3] Bengbu Med Coll, Dept Neurosurg, Affiliated Hosp 2, Bengbu 233000, Anhui, Peoples R China
[4] Zhengzhou Univ, Henan Canc Hosp, Dept Radiat Oncol, Affiliated Canc Hosp, Zhengzhou 450000, Henan, Peoples R China
[5] Univ Texas MD Anderson Canc Ctr, Neurooncol Dept, Houston, TX 77030 USA
基金
中国国家自然科学基金;
关键词
Glioma initiating cells; Notch1; CXCR4; Invasion; Migration; CANCER STEM-CELLS; INDUCED APOPTOSIS; PRIMARY BRAIN; CXCR4; GLIOBLASTOMA; INHIBITION; SURVIVAL; AKT; CONTRIBUTES; EXPRESSION;
D O I
10.1186/s13046-019-1319-4
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Background Glioma initiating cells (GICs), also known as glioma stem cells (GSCs), play an important role in the progression and recurrence of glioblastoma multiforme (GBM) due to their potential for self-renewal, multiple differentiation and tumor initiation. In the recent years, Notch1 has been found to be overexpressed in GICs. However, the regulatory mechanism of Notch1 in the self-renewal and invasion ability of GICs remains unclear. This study aims to explore the effect of Notch pathway on self-renewal and invasion of GICs and the underlying mechanisms. Methods Bioinformatic analysis and immunohistochemistry (IHC) were performed to evaluate the expression of Notch1 and Hes1 in GBM samples. Immunofluorescent (IF) staining was performed to observe the distribution of Notch1 and CXCR4 in GBM and GICs. Both pharmacological intervention and RNA interference were employed to investigate the role of Notch1 in GICs self-renewal, invasion and tumor growth in vitro or in vivo. The crosstalk effect of Notch1 and CXCL12/CXCR4 system on GIC self-renewal and invasion was explored by sphere formation assay, limiting dilution assay and Transwell assay. Western blots were used to verify the activation of Notch1/CXCR4/AKT pathway in self-renewal, invasion and tumor growth of GICs. Luciferase reporter assay was used to testify the potential binding site of Notch1 signaling and CXCR4. The orthotopic GICs implantations were established to analyze the role and the mechanism of Notch1 in glioma progression in vivo. Results Notch1 signaling activity was elevated in GBM tissues. Notch1 and CXCR4 were both upregulated in GICs, compared to Notch1 positive glioma cells comprised a large proportion in the CD133+ glioma cell spheres, CXCR4 positive glioma cells which usually expressed Notch1 both and dispersed in the periphery of the sphere, only represent a small subset of CD133+ glioma cell spheres. Furthermore, downregulation of the Notch1 pathway by shRNA and MK0752 significantly inhibited the PI3K/AKT/mTOR signaling pathway via the decreased expression of CXCR4 in GICs, and weakened the self-renewal, invasion and tumor growth ability of GICs. Conclusions These findings suggest that the cross-talk between Notch1 signaling and CXCL12/CXCR4 system could contribute to the self-renewal and invasion of GICs, and this discovery could help drive the design of more effective therapies in Notch1-targeted treatment of GBMs.
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页数:15
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