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2017 ; 8
(1
): 819-832
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M2-like tumor-associated macrophages drive vasculogenic mimicry through
amplification of IL-6 expression in glioma cells
#MMPMID27903982
Zhang L
; Xu Y
; Sun J
; Chen W
; Zhao L
; Ma C
; Wang Q
; Sun J
; Huang B
; Zhang Y
; Li X
; Qu X
Oncotarget
2017[Jan]; 8
(1
): 819-832
PMID27903982
show ga
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.