Summary
Objective
Investigating the impact of FOXP3 (transcription factor forkhead box P3) expression on the biological behavior of esophageal squamous cell carcinoma (ESCC) and its influence on the sensitivity of ESCC cells towards cetuximab-targeted (an EGFR monoclonal antibody inhibitor) therapy.
Methods
A specifically designed recombinant FOXP3 shRNA plasmid was synthesized to target the human FOXP3 gene, and the plasmid was transfected into TE12 cells using a liposome method. Multiple assays were conducted to evaluate the effect of FOXP3 expression on ESCC cells and their response to cetuximab treatment. Proliferation activity and cetuximab sensitivity of ESCC cells were measured using the CCK‑8 assay. The invasion ability of cells was assessed using an in vitro invasion assay. Furthermore, the efficacy of cetuximab in treating ESCC was analyzed using a tumorigenesis assay in nude mice.
Results
Silencing the FOXP3 gene in the TE12 cell line (shFOXP3 group) resulted in a significant reduction in FOXP3 mRNA and protein expression (p = 0.013). The shFOXP3 group exhibited slowed cell growth (p = 0.035), decreased invasion rate (p = 0.031), and increased sensitivity to cetuximab treatment (p = 0.039) compared to the control group (shNC group). In the in vivo tumorigenesis assay, the shFOXP3 group demonstrated a significant reduction in tumor volume and lung metastasis rate following cetuximab treatment (p = 0.028 and 0.007, respectively).
Conclusion
High FOXP3 expression promotes the proliferation and migration of ESCC cells, while negatively affecting their sensitivity to cetuximab-targeted therapy. Consequently, targeting FOXP3 shows potential therapeutic implications for enhancing the effectiveness of cetuximab treatment in ESCC patients.
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SHW and YW designed the experiments. ZJZ and JFZ performed the experiments. ZHH and MY collected and analyzed the data. ZHH and MY drafted manuscript. All authors read and approved the final manuscript.
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S. Wu, Y. Wang, Z. Xiao, J. Zhang, Z. He and M. Ye declare that they have no competing interests.
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The current study was approved by the Animal Ethics Committee and was conducted in accordance with the relevant agreements with Renji Hospital. All procedures were performed in accordance with the Guidance Suggestions for the Care and Use of Laboratory Animals, formulated by the Ministry of Science and Technology of China. Consent for Publication: not applicable.
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Shenghong Wu and Yu Wang are the first co-authors and contributed equally to this work.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Wu, S., Wang, Y., Xiao, Z. et al. FOXP3 expression in esophageal squamous cell carcinoma. Wien Klin Wochenschr (2023). https://doi.org/10.1007/s00508-023-02291-4
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DOI: https://doi.org/10.1007/s00508-023-02291-4