Biotransformation enzymes and lung cell response to 2-hydroxyethyl-methacrylate

Area of Science:

• Toxicology
• Cell Biology
• Biochemistry

Background:

• 2-hydroxyethyl-methacrylate (HEMA) is a widely used monomer with potential toxic effects.
• Cytochrome P450 (CYP) enzymes play a crucial role in xenobiotic metabolism and detoxification.
• The aryl hydrocarbon receptor (AhR) pathway is implicated in cellular responses to environmental toxins.

Purpose of the Study:

• To investigate the role of CYP enzymes in HEMA's toxicity.
• To explore the involvement of the AhR pathway in HEMA-induced cellular responses.
• To identify potential protective strategies against HEMA toxicity.

Main Methods:

• In vitro study using primary rat alveolar type 2 cells.
• Exposure to varying concentrations of HEMA.
• Immunocytochemistry for nuclear translocation of AhR.
• Reverse transcriptase PCR for AhR-regulated gene expression.
• Assessment of apoptotic morphology and reactive oxygen species (ROS) levels.
• Co-treatment with a CYP inhibitor (disulfiram) and an antioxidant (vitamin C).

Main Results:

• HEMA exposure led to nuclear translocation of AhR and increased mRNA levels of AhR-regulated detoxification genes.
• 1 mM HEMA induced apoptotic-like morphology in cells within 6 hours.
• Co-treatment with disulfiram or vitamin C protected cells from HEMA-induced apoptosis.
• No significant increase in ROS levels was observed in HEMA-exposed cells.

Conclusions:

• HEMA activates AhR-regulated gene transcription.
• CYP enzymes are involved in generating a toxic HEMA metabolite.
• CYP inhibition or antioxidant treatment can mitigate HEMA-induced cellular damage.