TNF‑α‑mediated upregulation of SOD‑2 contributes to cell proliferation and cisplatin resistance in esophageal squamous cell carcinoma

Oncology Reports
Jing ZuoXianghong Zhang

Abstract

Intrinsic and acquired resistance of cancer to radio‑and chemotherapy is one of the major challenges in the treatment of esophageal squamous cell carcinoma (ESCC). Elevated reactive oxygen species (ROS) play an important role in the resistance to cisplatin in ESCCs. Super dismutase [Mn], mitochondrial (SOD‑2), an important primary antioxidant enzyme located in mitochondria, could regulate ROS production. Our previous study showed that tumor necrosis factor‑α (TNF‑α)‑mediated SOD‑2 through NF‑κB was involved in epithelial‑mesenchymal transition and migration in A549 cells. Therefore, the present study aimed to identify if TNF‑α mediated SOD‑2 upregulation is involved in cisplatin resistance in ESCC. It was identified that a higher expression of SOD‑2 in human ESCC samples was associated with TNF‑α expression and poor overall survival in patients with ESCC, suggesting that SOD‑2 may act as an oncogene in ESCC. To further confirm if TNF‑α could upregulate SOD‑2 to contribute to cell proliferation, the human ESCC cell line Eca‑109 was treated with TNF‑α in vitro. TNF‑α could upregulate SOD‑2 and induce cell proliferation in Eca109 cells, while blocking SOD‑2 using small interfering RNA (siRNA) inhibited TNF‑α‑induced cell prolifera...Continue Reading

Citations

May 1, 2021·Cancers·Ekaterina O GubernatorovaSergei A Nedospasov

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