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Open Access 01-12-2018 | Research article

CXCL9/10/11, a regulator of PD-L1 expression in gastric cancer

Authors: Chenlu Zhang, Zhi Li, Ling Xu, Xiaofang Che, Ti Wen, Yibo Fan, Ce Li, Shuo Wang, Yu Cheng, Xiaoxun Wang, Xiujuan Qu, Yunpeng Liu

Published in: BMC Cancer | Issue 1/2018

Abstract

Background

Programmed death-ligand 1 (PD-L1) is an immunosuppressor that plays an important role in cancer treatments. Although majority of the studies demonstrated that PD-L1 expression was regulated by cellular intrinsic and extrinsic controls, and IFN-γ was a key molecule of extrinsic control, other studies imply that other cytokines play important roles in PD-L1 expression. In this study, we investigated the regulation of PD-L1 by chemokine signaling pathway in gastric cancer (GC) cells.

Methods

Bioinformatics was used to explore the PD-L1-related genes in GC and propose a hypothesis. PD-L1 and CXCR3 expression were detected by western blot in SGC7901 and MKN74 cell lines. Meanwhile, PD-L1 and CXCR3 expressions were immunohistochemically assessed for their relevance. Moreover, PD-L1, pSTAT3 and pAkt were detected after treatment with CXCL9/10/11. Furthermore,PD-L1, pSTAT3 and pAkt were evaluated after blocking chemokine signaling in SGC7901 cells.

Results

Based on online database analysis, CXCL9/10/11-CXCR3 is proposed to upregulate PD-L1 expression by activating the STAT and PI3K-Akt pathways. This hypothesis was confirmed by in vitro and vivo experiments. CXCR3 and PD-L1 were expressed in GC cell lines and tissues, and the expression of CXCR3 and PD-L1 was positively related. PD-L1 was upregulated after treatment with CXCL9/10/11, accompanied by activation of STAT3 and Akt. After blocking chemokine signaling, upregulation of PD-L1 and activation of STAT3 and Akt were diminished.

Conclusions

CXCL9/10/11-CXCR3 upregulated the expression of PD-L1 by activating the STAT and PI3K-Akt signaling pathways in GC cells. There was a significant positive correlation between the expression of PD-L1 and CXCR3 in gastric cancer patient tissues.

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Title: CXCL9/10/11, a regulator of PD-L1 expression in gastric cancer
Authors: Chenlu Zhang
Zhi Li
Ling Xu
Xiaofang Che
Ti Wen
Yibo Fan
Ce Li
Shuo Wang
Yu Cheng
Xiaoxun Wang
Xiujuan Qu
Yunpeng Liu
Publication date: 01-12-2018
Publisher: BioMed Central
Published in: BMC Cancer / Issue 1/2018
Electronic ISSN: 1471-2407
DOI: https://doi.org/10.1186/s12885-018-4384-8

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