Abstract
Objectives
High-risk human papillomavirus (HR-HPV) is an important risk factor for esophageal cancer. Macrophages constitute a crucial immune medium for regulating HPV-related tumors; however, the specific regulatory mechanisms remain unknown. Therefore, the purpose of our current study was to investigate the mechanism by which HPV16E6 regulates macrophages to promote the invasion and metastasis of esophageal cancer.
Methods
HPV16E6 infection was detected by polymerase chain reaction. Immunohistochemistry was used to verify the distribution of tumor-associated macrophages (TAMs) and MMP-9 expression in esophageal squamous cell carcinoma tissues (ESCCs), and cancer adjacent normal tissues (CANs) from Kazakh patients. ESCC cells were transfected with a plasmid over-expressing HPV16E6 and non-contact cocultured with macrophages.
Results
The infection rate of HPV16E6 in Kazakh ESCCs was clearly higher than that in CANs (P < 0.05). The density of CD163-positive TAMs was significantly positively correlated with HPV16E6 infection in ESCCs (P < 0.05). After coculturing macrophages and EC9706 cells transfected with the HPV16E6 plasmid, the phenotype of macrophages transformed into M2 macrophages. The migration and invasion ability of ESCC cells were higher in the HPV16E6-transfected and coculture group than in the HPV16E6 empty vector-transfected and non-cocultured HPV16E6-transfected groups (all P < 0.05). The density of M2-like TAMs in ESCCs was positively correlated with the level of MMP-9 expression. MMP-9 expression in the HPV16E6-ESCC coculture macrophages group was substantially higher than that in controls (all P < 0.05).
Conclusions
HPV16 infection mediates tumor-associated macrophages to promote ESCC invasion and migration.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (NO.81760428, NO.81960435 and NO.81460363), Start-up Project of High-level Talents Scientific Research in Shihezi University (RCZK2018C19), Science and Technology Development Project of Xinjiang Production and Construction Corps (NO. 2018AB033), National Early Detection and Treatment Project for Upper Digestive Tract in Rural Area in China (NO.2018), and The Youth Science and Technology Innovation Leading Talents Project of Corps (NO.2017CB004). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Supplementary file1 Table S1. Analyses of the clinical pathological parameters in ESCC patients. Table S2. The PCR reaction system of β-globin. Table S3. The PCR reaction system of the HPV16E6 gene. Table S4. The reaction system of qRT-PCR. Table S5. The reaction procedure of qRT-PCR (DOCX 46 KB)
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Yuan, X., Liu, K., Li, Y. et al. HPV16 infection promotes an M2 macrophage phenotype to promote the invasion and metastasis of esophageal squamous cell carcinoma. Clin Transl Oncol 23, 2382–2393 (2021). https://doi.org/10.1007/s12094-021-02642-5
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DOI: https://doi.org/10.1007/s12094-021-02642-5