Upregulation of SOX4 antagonizes cellular senescence in esophageal squamous cell carcinoma

Area of Science:

• Oncology
• Cell Biology
• Molecular Biology

Background:

• Cellular senescence is a tumor defense mechanism triggered by stresses like DNA damage.
• The role of senescence in cancer progression, particularly how cancer cells overcome it, remains unclear.
• Esophageal squamous cell carcinoma (ESCC) is a significant global health concern.

Purpose of the Study:

• To investigate the role of senescence in ESCC.
• To identify molecular mechanisms by which ESCC cells overcome senescence.
• To explore the function of gender determining region Y-box 4 (SOX4) in ESCC progression and senescence.

Main Methods:

• Gene expression array analysis comparing ESCC tissues with paired normal tissues.
• Reverse transcription-quantitative polymerase chain reaction (RT-qPCR) to validate gene expression.
• Short hairpin RNA (shRNA) mediated knockdown of SOX4.
• Assessment of cell proliferation and doxorubicin-induced senescence.

Main Results:

• ESCC tissues exhibit upregulation of genes associated with the senescence-associated secretory phenotype (SASP), including proteinases, chemokines, and inflammation factors.
• Gender determining region Y-box 4 (SOX4) is upregulated in ESCC and its expression is inversely correlated with senescence markers.
• SOX4 knockdown in ESCC cells reduced proliferation and enhanced doxorubicin-induced senescence.

Conclusions:

• ESCC possesses a senescent microenvironment.
• SOX4 plays a crucial anti-senescence role in ESCC progression.
• Targeting SOX4 may represent a therapeutic strategy to enhance anti-tumor immunity and overcome senescence in ESCC.