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• W1558070423 endingPage "e0131059" @default.
• W1558070423 startingPage "e0131059" @default.
• W1558070423 abstract "Glioblastoma is one of the most aggressive and fatal brain cancers due to the highly invasive nature of glioma cells. Microglia infiltrate most glioma tumors and, therefore, make up an important component of the glioma microenvironment. In the tumor environment, microglia release factors that lead to the degradation of the extracellular matrix and stimulate signaling pathways to promote glioma cell invasion. In the present study, we demonstrated that microglia can promote glioma migration through a mechanism independent of extracellular matrix degradation. Using western blot analysis, we found upregulation of proline rich tyrosine kinase 2 (Pyk2) protein phosphorylated at Tyr579/580 in glioma cells treated with microglia conditioned medium. This upregulation occurred in rodent C6 and GL261 as well as in human glioma cell lines with varying levels of invasiveness (U-87MG, A172, and HS683). siRNA knock-down of Pyk2 protein and pharmacological blockade by the Pyk2/focal-adhesion kinase (FAK) inhibitor PF-562,271 reversed the stimulatory effect of microglia on glioma migration in all cell lines. A lower concentration of PF-562,271 that selectively inhibits FAK, but not Pyk2, did not have any effect on glioma cell migration. Moreover, with the use of the CD11b-HSVTK microglia ablation mouse model we demonstrated that elimination of microglia in the implanted tumors (GL261 glioma cells were used for brain implantation) by the local in-tumor administration of Ganciclovir, significantly reduced the phosphorylation of Pyk2 at Tyr579/580 in implanted tumor cells. Taken together, these data indicate that microglial cells activate glioma cell migration/dispersal through the pro-migratory Pyk2 signaling pathway in glioma cells." @default.
• W1558070423 created "2016-06-24" @default.
• W1558070423 creator A5025710882 @default.
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• W1558070423 date "2015-06-22" @default.
• W1558070423 modified "2023-10-01" @default.
• W1558070423 title "Microglia Activate Migration of Glioma Cells through a Pyk2 Intracellular Pathway" @default.
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• W1558070423 doi "https://doi.org/10.1371/journal.pone.0131059" @default.
• W1558070423 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4476590" @default.
• W1558070423 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26098895" @default.
• W1558070423 hasPublicationYear "2015" @default.
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