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CXCL12-induced upregulation of FOXM1 expression promotes human glioblastoma cell invasion.
In this study, we demonstrate that CXCL12 increases the production of FOXM1 by binding to CXCR4 in GBM cell lines. Furthermore, pretreatment with an inhibitor of the PI3K/AKT pathway abrogated the CXCL12-induced expression of FOXM1. In addition, there was a positive correlation between CXCL12/CXCR4 expression and FOXM1 expression in human malignant glioma tissues. Finally, a functional assay revealed that CXCL12 does not stimulate GBM cell invasion when FOXM1 expressionis silenced using a small interfering RNA (siRNA). Collectively, these findings suggest that CXCL12 promotes GBM cell invasion in part byincreasing the expr...
Source: Biochemical and Biophysical Research communications - February 19, 2014 Category: Biochemistry Authors: Wang S, Zhang S, Li J, Xu X, Weng Y, Zheng M, Ouyang L, Li F Tags: Biochem Biophys Res Commun Source Type: research

Human umbilical cord mesenchymal stem cells inhibit C6 glioma growth via secretion of dickkopf-1 (DKK1).
Abstract Mesenchymal stem cells (MSCs) represent a potential therapeutic target for glioma. We determined the molecular mechanism of inhibitory effect of human umbilical cord-derived MSCs (hUC-MSCs) on the growth of C6 glioma cells. We demonstrated that hUC-MSCs inhibited C6 cell growth and modulated the cell cycle to G0/G1 phase. The expression of β-catenin and c-Myc was downregulated in C6 cells by conditioned media from hUC-MSCs, and the levels of secreted DKK1 were positively correlated with concentrations of hUCMSCs-CM. The inhibitory effect of hUC-MSCs on C6 cell proliferation was enhanced as the concentrat...
Source: Molecular and Cellular Biochemistry - October 9, 2013 Category: Biochemistry Authors: Ma S, Liang S, Jiao H, Chi L, Shi X, Tian Y, Yang B, Guan F Tags: Mol Cell Biochem Source Type: research

Inhibition of autophagy enhances apoptosis induced by proteasome inhibitor bortezomib in human glioblastoma U87 and U251 cells.
Abstract Glioblastoma is the most aggressive cerebral gliomas. Despite advances in therapies, the prognosis is still very poor. Therefore, novel therapeutic strategies are required. As a proteasome inhibitor, bortezomib has shown its efficacy as an active antitumor agent against a variety of tumors. However, inhibition of proteasome activity leads to cell death and also induces cell autophagy, and due to the dual roles of autophagy in the survival and death of tumor cells, the effect of inhibition of autophagy on glioblastoma cells remains to be explored. We therefore assessed whether bortezomib is capable of indu...
Source: Molecular and Cellular Biochemistry - October 9, 2013 Category: Biochemistry Authors: Zhang X, Li W, Wang C, Leng X, Lian S, Feng J, Li J, Wang H Tags: Mol Cell Biochem Source Type: research

MicroRNA-222 promotes tumorigenesis via targeting DKK2 and activating the Wnt/β-catenin signaling pathway
Highlights: Abstract: MiR-222 in glioma can regulate cell cycle progression and apoptosis. However, the relationship between miR-222 and Wnt/β-catenin signaling pathway in glioma remains unknown. Here, we found that the Dickkopf-2 gene (DKK2) was a direct target of miR-222 by target prediction analysis and dual luciferase reporter assay. RNA interference silencing of DKK2 proved that miR-222 overexpression led to constitutive activation of β-catenin through inhibition of DKK2 expression in glioma cells. Furthermore, miR-222 siRNA significantly inhibited tumorigenesis in vivo. Finally, Western blot analysis showed that mi...
Source: FEBS Letters - April 15, 2013 Category: Biochemistry Authors: Qifeng Li, Ke Shen, Yang Zhao, Xiaoguang He, Chenkai Ma, Lin Wang, Baocheng Wang, Jianwen Liu, Jie Ma Tags: Research Letters Source Type: research

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