Xenotropic and Polytropic Retrovirus Receptor 1 (XPR1) Promotes Progression of Tongue Squamous Cell Carcinoma (TSCC) Via Activation of NF-κB Signaling

Overview

Journal J Exp Clin Cancer Res

Publisher Biomed Central

Specialty Oncology

Date 2019 Apr 19

PMID 30995931

Citations 17

Authors

Wei-Chao Chen

Qiu-Li Li

Qimei Pan

Hua-Yong Zhang

Xiao-Yan Fu

Fan Yao

Jian-Ning Wang

An-Kui Yang

Affiliations

Soon will be listed here.

Abstract

Background: Xenotropic and polytropic retrovirus receptor 1 (XPR1), a previously identified cellular receptor for several murine leukemia viruses, plays a role in many pathophysiological processes. However, the role of XPR1 in human cancers has not yet been characterized.

Methods: Real-time PCR and western blotting assay were used to measure the expression of XPR1 in tongue squamous cell carcinoma (TSCC) tissues. Expression of XPR1 and p65 in clinical specimens was analyzed using immunohistochemical assay. The function of XPR1 on progression of TSCC was explored using in vitro and in vivo experiments. The molecular mechanism by which XPR1 helps to cancer progression was investigated by luciferase reporter activity, ELISA, PKA activity assay, immunofluorescence, western blotting and qPCR assay.

Results: Herein, we find that XPR1 is markedly upregulated in TSCC tissues compared to normal tongue tissues. High expression of XPR1 significantly correlates with the malignant features and poor patient survival in TSCC. Ectopic expression of XPR1 increases, while silencing of XPR1 reduces the proliferation, invasion and anti-apoptosis capacities of TSCC cells. Importantly, silencing of XPR1 effectively inhibits the tumorigenecity of TSCC cells. Moreover, we identified that XPR1 increased the concentration of intracellular cAMP and activated PKA. Thus, XPR1 promoted phosphorylation and activation of NF-κB signaling, which is required for XPR1-mediated oncogenic roles and significantly correlates with XPR1 expression in clinical specimens.

Conclusions: These findings uncover a critical role of XPR1 in TSCC progression via activation of NF-κB, and suggest that XPR1 might be a potential prognostic marker or therapeutic target.

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