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Mesenchymal Stem/stromal Cells-derived IL-6 Promotes Nasopharyngeal Carcinoma Growth and Resistance to Cisplatin Via Upregulating CD73 Expression

Overview
Journal J Cancer
Specialty Oncology
Date 2020 Mar 5
PMID 32127934
Citations 24
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Abstract

Previous studies have implicated the important role of mesenchymal stem/stromal cells (MSCs) within tumor microenvironment (TME) in the pathogenesis and progression of nasopharyngeal carcinoma (NPC), but the potential mechanisms are still unclear. Herein, we showed that an elevated IL-6 level was positively correlated with elevated expression of CD73 in TME of NPC. NPC specimens with an IL-6CD73 phenotype showed higher expression levels of gp80, gp130, p-STAT3, MMP-9 and α-SMA, and clinically, a poorer prognosis than those with an IL-6CD73 phenotype. We found that stimulation with conditioned media derived from IL-6 gene knocked out MSC (MSC-CM) down-regulated the expression of CD73, IL-6, gp80, p-STAT3, and proliferative cell nuclear antigen (PCNA) in CNE-2 NPC cells. Meanwhile, NPC cells co-cultured with MSC-CM were more sensitive to cisplatin than those co-cultured with MSC-CM. Additionally, MSC-derived IL-6 transcriptionally upregulated CD73 expression activating STAT3 signaling pathway in NPC cells. In summary, our findings suggest that MSCs promote NPC progression and chemoresistance by upregulation of CD73 expression activating STAT3 signaling pathway.

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