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2016 ; 7
(47
): 77244-77256
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Elevated AEG-1 expression in macrophages promotes hypopharyngeal cancer invasion
through the STAT3-MMP-9 signaling pathway
#MMPMID27793010
Liu X
; Lv Z
; Zou J
; Liu X
; Ma J
; Sun C
; Sa N
; Xu W
Oncotarget
2016[Nov]; 7
(47
): 77244-77256
PMID27793010
show ga
Macrophages play a critical role in tumor invasion and metastasis, which remain
major causes of mortality in patients with hypopharyngeal cancer. Here we
investigate the effect of an oncogene, AEG-1 expressed in macrophages on the
invasion of hypopharyngeal cancer cells. AEG-1 is more highly expressed in
macrophages of human hypopharyngeal cancer samples compared with adjacent
non-tumor controls. Using matrigel invasion assay system, THP-1-derived
macrophages with forced AEG-1 overexpression enhance FaDu cell invasion whereas
macrophages with AEG-1 silence inhibit. Matrix metalloproteinase 9 (MMP-9), which
is important in tumor invasion and metastasis through degrading extracellular
matrix, is up-reulated by AEG-1 partly through NF-?B p65 in macrophages.
Intriguingly, macrophage AEG-1 also induces MMP-9 up-regulated expression in FaDu
cells. Furthermore, macrophage AEG-1 activates signal transducer and activator of
transcription 3 (STAT3) in FaDu cells, which is responsible for macrophage
AEG-1-induced an increase in MMP-9 expression and invasion of FaDu cells. This is
the first to demonstrate that macrophage AEG-1 promotes tumor invasion through
up-regulation of MMP-9 in both macrophages and cancer cells. Thus, the results
provide evidences that macrophage AEG-1 contributes to promotion of tumor
invasion, and represents as a potential target in hypopharyngeal cancer therapy.