The pancreatic cancer secreted REG4 promotes macrophage polarization to M2 through EGFR/AKT/CREB pathway

Ma,Xiuying; Wu,Deqing; Zhou,Shu; Wan,Feng; Liu,Hua; Xu,Xiaorong; Xu,Xuanfu; Zhao,Yan; Tang,Maochun

doi:10.3892/or.2015.4357

The pancreatic cancer secreted REG4 promotes macrophage polarization to M2 through EGFR/AKT/CREB pathway

Authors:
- Xiuying Ma
- Deqing Wu
- Shu Zhou
- Feng Wan
- Hua Liu
- Xiaorong Xu
- Xuanfu Xu
- Yan Zhao
- Maochun Tang
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Affiliations: Department of Gastroenterology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, P.R. China
Published online on: October 29, 2015 https://doi.org/10.3892/or.2015.4357
Pages: 189-196

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Abstract

In the periphery of pancreatic ductal adenocarcinoma (PDAC), high accumulation of tumor-associated macrophages (TAMs), which exhibit M2 phenotype, has been shown to be correlated with extra-pancreatic invasion, lymph vessel invasion, lymph node involvement and shortened survival time. However, mechanisms by which tumor cells educate and reprogram TAMs remain largely unclear. The phenotype of TAMs in PDAC tissues was confirmed by immunofluoresence and confocal microscopy. Human CD14+ monocytes were incubated with recombinant human REG4 (rREG4) before being stimulated with LPS and IL-10 and IL-6 were measured with ELISA. A panel of M1 and M2 genes were measured by quantitative real-time PCR. Panc1, AsPC1 and BxPC3 cells were cultured in the conditioned medium (CM) and treated with REG4. The macrophages were infected with CREB shRNA or cultured by the CM of Panc1 cells infected with REG4 shRNA. The expression of CD163, CD206 and REG4 and the phosphorylation levels of epidermal growth factor receptor (EGFR), AKT and cAMP response element-binding protein (CREB) in cells were assessed with western blotting. Cell proliferation and invasiveness were also assessed. The rREG4 or the conditioned medium of Panc1 cells which secreted REG4 induced the polarization macrophages to M2 phenotype. Treatment of human macrophages with REG4 resulted in phosphorylation of EGFR, AKT and CREB. The latter was responsible for REG4-mediated macrophage polarization to M2. The conditioned medium of macrophages treated with rREG4 promoted the proliferation and invasion of pancreatic cancer cell lines. REG4, overexpressed in PDAC and secreted by cancer cells, promoted macrophage polarization to M2, through at least in part, activation of ERK1/2 and CREB and changed the microenvironment to facilitate cancer growth and metastasis.

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