POLE2 knockdown reduce tumorigenesis in esophageal squamous cells

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• Esophageal squamous cell carcinoma (ESCC) is a prevalent digestive system malignancy with unclear underlying mechanisms.
• DNA polymerase epsilon 2, accessory subunit (POLE2) plays roles in DNA replication, repair, and cell cycle control.
• The specific involvement of POLE2 in ESCC pathogenesis remains largely unelucidated.

Purpose of the Study:

• To investigate the expression levels of POLE2 in ESCC tissues.
• To determine the correlation between POLE2 expression and ESCC patient prognosis.
• To elucidate the functional role of POLE2 in ESCC progression both in vitro and in vivo.

Main Methods:

• Immunohistochemistry (IHC) was employed to assess POLE2 expression in ESCC tissues.
• POLE2 knockdown cell lines were established and validated using qPCR and Western blot.
• Cellular proliferation, apoptosis, migration, and tumor formation in xenotransplantation models were evaluated using MTT assays, colony formation assays, flow cytometry, wound-healing assays, and Transwell assays.

Main Results:

• POLE2 was found to be significantly overexpressed in ESCC tissues, correlating with tumor progression and poor patient prognosis.
• Downregulation of POLE2 suppressed ESCC cell proliferation and migration while promoting apoptosis in vitro.
• In vivo studies confirmed that POLE2 positively influenced ESCC tumor formation, with its knockdown altering the expression of key apoptosis-related proteins and impacting the PI3K/Akt and Cyclin D1 signaling pathways.

Conclusions:

• POLE2 is implicated in the development and progression of ESCC.
• POLE2 may serve as a valuable prognostic biomarker for ESCC.
• Targeting POLE2 presents a potential therapeutic strategy for improving ESCC treatment outcomes.