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Radiation promotes epithelial-to-mesenchymal transition and invasion of pancreatic cancer cell by activating carcinoma-associated fibroblasts.

ABSTRACT: The tumor microenvironment is of crucial importance affecting treatment and prognosis. High degree of carcinoma-associated fibroblast (CAF) infiltration occurs in pancreatic cancer, though its effect on radiotherapy remains unclear. In this study, we demonstrated that radiation enhanced the migration- and invasion-promoting capacity of CAFs both in vitro and in vivo in a lung metastasis model. Radiation exposure increased the expression of CXCL12 by CAFs. CAF-derived CXCL12 promoted tumor cell EMT and invasion directly, acting through CXCR4 on pancreatic cancer cells. In addition, we showed that CXCL12-CXCR4 signaling promoted pancreatic cancer cell EMT and invasion by activating the P38 pathway. Therefore, our study concluded that radiation promoted pancreatic cancer cell invasion and EMT by activating CAFs, while inhibiting the CXCL12/CXCR4 interaction between pancreatic cancer cells and CAFs could potentially attenuate tumor cell invasion induced by radiation, which provides an opportunity for the development of novel therapeutic targets to improve the prognosis for human pancreatic cancer treated with radiation therapy.

SUBMITTER: Li D

PROVIDER: S-EPMC5088285 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Radiation promotes epithelial-to-mesenchymal transition and invasion of pancreatic cancer cell by activating carcinoma-associated fibroblasts.

Li Doudou D Qu Chao C Ning Zhouyu Z Wang Haiyong H Zang Kun K Zhuang Liping L Chen Lianyu L Wang Peng P Meng Zhiqiang Z

American journal of cancer research 20161001 10

The tumor microenvironment is of crucial importance affecting treatment and prognosis. High degree of carcinoma-associated fibroblast (CAF) infiltration occurs in pancreatic cancer, though its effect on radiotherapy remains unclear. In this study, we demonstrated that radiation enhanced the migration- and invasion-promoting capacity of CAFs both in vitro and in vivo in a lung metastasis model. Radiation exposure increased the expression of CXCL12 by CAFs. CAF-derived CXCL12 promoted tumor cell E ...[more]

PMID: 27822411

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Project description:PurposeThe aim of this work was to investigate the clinicopathological significance of fibrinogen gamma chain (FGG) and its biological roles during hepatocellular carcinoma (HCC) development and progression.MethodsThe expression of FGG was examined by Western blot and reverse transcription quantitative PCR in two different sample sets, including 24 or 35 pairs of HCC tumor tissues and their corresponding adjacent non-tumorous tissues. Afterward, association analysis between the expression of FGG and clinicopathological characteristics was systematically analyzed in 79 HCC patients. Subsequently, the mobility and invasiveness of SK-HEP-1 cells with FGG overexpression or knockdown were evaluated by transwell assay and wound healing assay. Additionally, the expressions of epithelial to mesenchymal transition (EMT)-associated markers were also detected in FGG overexpressed or silenced SK-HEP-1 cells.ResultsThe expression of FGG was significantly increased in primary HCC tissues comparing with its corresponding adjacent non-tumorous tissues. Clinical pathological analysis demonstrated that upregulation of intracellular FGG was significantly associated with increased vascular invasion, more satellite nodules, and more advanced TNM stage, and HCC patients with stronger expression of FGG had a higher recurrence rate and correspondingly a shorter overall survival time. Meanwhile, the high expression of FGG was also proved to be an independent risk factor for disease-free survival after surgical resection. In vitro phenotype studies showed that overexpression of FGG could promote the migration and invasion in SK-HEP-1 cells; conversely, these phenotypes could be significantly inhibited by knocking down the expression of FGG. Mechanism studies indicated that FGG could promote the migration and invasion through EMT signaling pathway by regulating the expressions of Slug and ZEB1.ConclusionFGG played important roles in enhancing cancer cell motility and invasiveness through EMT signaling, and might serve as a potential prognostic biomarker for HCC patients.

Project description:BACKGROUND:Esophageal squamous cell carcinoma (ESCC) is one of the most prevalent cancers worldwide. Due to its high morbidity and mortality rates, it is urgent to find a molecular target that contributes to esophageal carcinogenesis and progression. In this research, we aimed to investigate the functions of Latent transforming growth factor ? binding protein 1(LTBP1) in ESCC progression and elucidate the underlying mechanisms. METHODS:The tandem mass tag-based quantitative proteomic approach was applied to screen the differentially expressed proteins (DEPs) between 3 cases of ESCC tumor samples and paired normal tissues. Then the DEPs were validated in human ESCC tissues using western blot assays and GEPIA database respectively. The expression level of LTBP1 was detected in 152 cases of ESCC tissues and paired normal tissues. Loss-of-function assays were performed to detect the function of LTBP1 in vivo and in vitro. Immunofluorescence and Western blot assays were used to detect the expression of apoptosis, epithelial-mesenchymal transition (EMT) and cancer-associated fibroblasts (CAFs) markers. RESULTS:A total of 39 proteins were screened to be up-regulated (ratio?>?2.0) in all three ESCC tissues. The results of immunohistochemistry assays indicated that the expression level of LTBP1 was higher in ESCC tissues than that in paired normal tissues (p?<?0.001). Overexpression of LTBP1 was positively associated with lymphatic metastasis in ESCC (p?=?0.002). Down-regulation of LTBP1 inhibited the invasion and migration as well as metastatic abilities in vitro and in vivo. It was also observed the down-regulation of LTBP1 not only decreased the mesenchymal phenotypes but also inhibited TGF?-induced EMT in ESCC cells. We further found that down-regulation of LTBP1 enhanced ESCC cells' sensitivity to 5-FU treatment. Inhibition of LTBP1 expression could also attenuate induction of CAFs transformation and restrain fibroblast express fibronectin (FN1) in ESCC cells. CONCLUSION:Overexpression of LTBP1 was associated with lymph node metastasis in ESCC. Our results indicated that LTBP1 not only increased the malignant behaviors of ESCC cells but also induced EMT and CAFs transformation. Our studies suggested an oncogenic role of LTBP1 in ESCC progression and it may serve as a potential therapeutic target for ESCC patients.

Dataset Information

Radiation promotes epithelial-to-mesenchymal transition and invasion of pancreatic cancer cell by activating carcinoma-associated fibroblasts.

Publications

Radiation promotes epithelial-to-mesenchymal transition and invasion of pancreatic cancer cell by activating carcinoma-associated fibroblasts.

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