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M2-like tumor-associated macrophages drive vasculogenic mimicry through amplification of IL-6 expression in glioma cells.


ABSTRACT: Vasculogenic mimicry (VM) has offered a new horizon for understanding tumor angiogenesis, but the mechanisms of VM in glioma progression have not been studied explicitly until now. As a significant component of immune infiltration in tumor microenvironment, macrophages have been demonstrated to play an important role in tumor growth and angiogenesis. However, whether macrophages could play a potential key role in glioma VM is still poorly understood. Herein we reported that both VM and CD163+ cells were associated with WHO grade and reduced patient survival, and VM channel counting was correlated to the number of infiltrated CD163+ cells in glioma specimens. In vitro studies of glioma cell lines implicated that M2-like macrophages (M2) promoted glioma VM. We found that conditional medium derived from M2 amplified IL-6 expression in glioma cells. Furthermore, our data indicated that IL-6 could promote glioma VM, as blocking IL-6 with neutralizing antibodies abrogated M2-mediated VM enhancement. In addition, the potent PKC inhibitor bisindolylmaleimide I could prevent M2-induced IL-6 upregulation and further inhibited glioma VM facilitation. Taken together, our results suggested that M2-like macrophages drove glioma VM through amplifying IL-6 secretion in glioma cells via PKC pathway.

SUBMITTER: Zhang L 

PROVIDER: S-EPMC5352199 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature

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M2-like tumor-associated macrophages drive vasculogenic mimicry through amplification of IL-6 expression in glioma cells.

Zhang Lin L   Xu Yangyang Y   Sun Jintang J   Chen Weiliang W   Zhao Lei L   Ma Chao C   Wang Qingjie Q   Sun Jia J   Huang Bin B   Zhang Yun Y   Li Xingang X   Qu Xun X  

Oncotarget 20170101 1


Vasculogenic mimicry (VM) has offered a new horizon for understanding tumor angiogenesis, but the mechanisms of VM in glioma progression have not been studied explicitly until now. As a significant component of immune infiltration in tumor microenvironment, macrophages have been demonstrated to play an important role in tumor growth and angiogenesis. However, whether macrophages could play a potential key role in glioma VM is still poorly understood. Herein we reported that both VM and CD163+ ce  ...[more]

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