Effects of Benzoapyrene on migration and invasion of lung cancer cells functioning by TNF-α

Area of Science:

• Environmental Toxicology
• Cancer Biology
• Molecular Oncology

Background:

• Benzo[a]pyrene (BaP) is a known environmental carcinogen.
• Lung cancer metastasis remains a significant challenge in oncology.
• The molecular mechanisms linking BaP exposure to lung cancer progression are not fully understood.

Purpose of the Study:

• To elucidate the mechanism by which Benzo[a]pyrene (BaP) induces lung cancer cell metastasis.
• To investigate the role of Tumor Necrosis Factor-alpha (TNF-α) as a potential mediator in BaP-induced lung cancer progression.
• To explore the relationship between BaP exposure and the TNF-α signaling pathway.

Main Methods:

• Cell viability was assessed using the crystal violet method to determine IC50 values.
• Quantitative real-time reverse transcription PCR (qRT-PCR) and Western blotting were used to measure TNF-α expression.
• Wound healing and Transwell assays were performed to evaluate cell migration and invasion.
• The expression of TNF-α pathway-associated proteins (TNF-α, NF-κB [P65], Caspase3, Caspase8) was analyzed.

Main Results:

• Benzo[a]pyrene (BaP) exposure increased lung cancer cell death rate in a dose-dependent manner.
• BaP significantly enhanced the migration and invasion capabilities of lung cancer cells.
• Expression levels of TNF-α, NF-κB, Caspase3, and Caspase8 were upregulated by BaP.
• Inhibition of TNF-α using shRNA attenuated the pro-metastatic effects of BaP.

Conclusions:

• Benzo[a]pyrene (BaP) positively influences lung cancer cell metastasis.
• The Tumor Necrosis Factor-alpha (TNF-α) pathway plays a critical role in mediating BaP-induced lung cancer development and metastasis.
• Targeting the TNF-α pathway presents a potential therapeutic strategy against BaP-associated lung cancer.