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http://dx.doi.org/10.3340/jkns.2016.59.2.106

Bacitracin Inhibits the Migration of U87-MG Glioma Cells via Interferences of the Integrin Outside-in Signaling Pathway  

Li, Songyuan (Brain Tumor Research Laboratory and Department of Neurosurgery Chonnam National University Research Institute of Medical Sciences, Chonnam National University Hwasun Hopital and Medical School)
Li, Chunhao (Brain Tumor Research Laboratory and Department of Neurosurgery Chonnam National University Research Institute of Medical Sciences, Chonnam National University Hwasun Hopital and Medical School)
Ryu, Hyang-Hwa (Brain Tumor Research Laboratory and Department of Neurosurgery Chonnam National University Research Institute of Medical Sciences, Chonnam National University Hwasun Hopital and Medical School)
Lim, Sa-Hoe (Brain Tumor Research Laboratory and Department of Neurosurgery Chonnam National University Research Institute of Medical Sciences, Chonnam National University Hwasun Hopital and Medical School)
Jang, Woo-Youl (Brain Tumor Research Laboratory and Department of Neurosurgery Chonnam National University Research Institute of Medical Sciences, Chonnam National University Hwasun Hopital and Medical School)
Jung, Shin (Brain Tumor Research Laboratory and Department of Neurosurgery Chonnam National University Research Institute of Medical Sciences, Chonnam National University Hwasun Hopital and Medical School)
Publication Information
Journal of Korean Neurosurgical Society / v.59, no.2, 2016 , pp. 106-116 More about this Journal
Abstract
Objective : Protein disulfide isomerase (PDI) acts as a chaperone on the cell surface, and it has been reported that PDI is associated with the tumor cell migration and invasion. The aims of this study are to investigate the anti-migration effect of bacitracin, which is an inhibitor of PDI, and the associated factor in this process. Methods : U87-MG glioma cells were treated with bacitracin in 1.25, 2.5, 3.75, and 5.0 mM concentrations. Western blot with caspase-3 was applied to evaluate the cytotoxicity of bacitracin. Adhesion, morphology, migration assays, and organotypic brain-slice culture were performed to evaluate the effect of bacitracin to the tumor cell. Western blot, PCR, and gelatin zymography were performed to investigate the associated factors. Thirty glioma tissues were collected following immunohistochemistry and Western blot. Results : Bacitracin showed a cytotoxicity in 3rd (p<0.05) and 4th (p<0.001) days, in 5.0 Mm concentration. The cell adhesion significantly decreased and the cells became a round shape after treated with bacitracin. The migration ability, the expression of phosphorylated focal adhesion kinase (p-FAK) and matrix metalloproteinase-2 (MMP-2) decreased in a bacitracin dose- and time-dependent manner. The U87-MG cells exhibited low-invasiveness in the 2.5 mM, compared with the untreated in organotypic brain-slice culture. PDI was expressed in the tumor margin, and significantly increased with histological glioma grades (p<0.001). Conclusion : Bacitracin, as a functional inhibitor of PDI, decreased the phosphorylated FAK and the secreted MMP-2, which are the downstream of integrin and play a major role in cell migration and invasion, might become one of the feasible therapeutic strategies for glioblastoma.
Keywords
Bacitracin; Protein disulfide isomerase; Integrin; Glioma; Migration; Invasion;
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