Perfluorooctanoic acid inhibits cell proliferation through mitochondrial damage

Area of Science:

• Toxicology
• Cell Biology
• Biochemistry

Background:

• Perfluorooctanoic acid (PFOA) is a persistent environmental contaminant.
• The liver and reproductive organs are known targets of PFOA toxicity.
• The precise toxic mechanisms of PFOA at the cellular level require further elucidation.

Purpose of the Study:

• To investigate the toxic mechanism of PFOA in HeLa Chang liver epithelial cells.
• To elucidate the effects of PFOA on cell proliferation, mitochondrial integrity, and key protein expressions.
• To identify potential molecular targets involved in PFOA-induced cellular damage.

Main Methods:

• HeLa Chang liver epithelial cells were incubated with varying concentrations and durations of PFOA.
• Cell proliferation was assessed using standard assays.
• Mitochondrial function was evaluated by measuring mitochondrial volume, membrane potential, and ATP production.
• Protein expression levels of key enzymes and signaling molecules were analyzed using Western blotting.
• Gene expression profiling and KEGG pathway analysis were performed.
• Protein-PFOA interactions were investigated.

Main Results:

• PFOA inhibited cell proliferation in a concentration- and time-dependent manner without significant cell death.
• Mitochondrial volume increased, while membrane potential and ATP production decreased significantly.
• Autophagosome-like vacuoles and mitochondrial inner membrane contraction were observed.
• Expression of acetyl CoA carboxylase (ACC) decreased, while mitochondrial dynamics proteins increased.
• Specific genes (SLC7, ChaC, 5S rRNA) and pathways (metabolic, olfactory transduction) were significantly affected.
• PPAR alpha, FABP1, and CYP1A1 were identified as direct binding targets.

Conclusions:

• PFOA induces liver cell proliferation inhibition primarily through the disruption of mitochondrial integrity and function.
• Mitochondrial dysfunction, altered protein expression, and specific gene regulation are key components of PFOA toxicity.
• PPAR alpha, FABP1, and CYP1A1 are identified as critical targets in PFOA-mediated cellular effects.