The Reciprocal Regulation Between TNF-α and Autophagy for Oral Squamous Cell Carcinoma Progression

Area of Science:

• Oncology
• Cell Biology
• Molecular Biology

Background:

• Autophagy and tumor necrosis factor-alpha (TNF-α) play critical roles in oral squamous cell carcinoma (OSCC) development.
• The intricate relationship between autophagy and TNF-α in OSCC progression is not fully understood.

Purpose of the Study:

• To investigate the interaction between autophagy and TNF-α in the context of OSCC progression.
• To elucidate the mechanisms by which TNF-α influences autophagy and vice versa in OSCC.

Main Methods:

• Cytokine levels were quantified using the Bio-plex assay.
• Autophagy activation was assessed via confocal microscopy and specific gene knockdown.
• Cell viability, growth, and NF-κB p65 activity were evaluated using various assays, including CellTiter-Glo, clonogenic assays, and reporter assays.
• Clinical data from OSCC patients were analyzed to correlate molecular findings with survival outcomes.

Main Results:

• TNF-α levels demonstrated a complex relationship with autophagy modulation, decreasing with autophagy inhibition and increasing under autophagy-inducing conditions.
• TNF-α exposure promoted OSCC cell viability and autophagy, with autophagy inhibitors reversing these effects.
• Elevated serum TNF-α levels were observed in OSCC patients compared to precancerous conditions and were associated with poorer disease-specific survival.
• Positive correlations were found between RelA, LC3, and P62 expression, and co-expression of TNF-α with autophagy markers (P62, LC3) and RelA was linked to shorter disease-free survival.

Conclusions:

• A reciprocal regulatory loop exists between TNF-α and autophagy, significantly contributing to OSCC progression.
• Targeting the interplay between TNF-α and autophagy presents a potential therapeutic strategy for OSCC.