Modulating effect of glutathione (GSH) on 2,4-dichlorophenoxyacetic acid (2,4-D) toxicity

Area of Science:

• Environmental Toxicology
• Biochemistry
• Molecular Biology

Background:

• 2,4-dichlorophenoxyacetic acid (2,4-D) is a widely used herbicide with significant environmental release.
• Exposure to 2,4-D is linked to increased cancer risk, necessitating investigation into its toxicity mechanisms.
• Natural antioxidants, like glutathione (GSH), may offer protection against pesticide-induced harm.

Purpose of the Study:

• To elucidate the toxicity and genotoxicity mechanisms of 2,4-D.
• To evaluate the impact of glutathione (GSH) supplementation on mitigating 2,4-D's adverse effects.
• To confirm oxidative stress as a molecular mechanism of 2,4-D toxicity.

Main Methods:

• Antimicrobial activity assays against Enterobacter hormaechei and Candida albicans to determine 2,4-D toxicity.
• Genotoxicity assessment using an E. coli recA biosensor strain measuring reactive oxygen species (ROS) induction.
• Yeast estrogen/androgen screen (YES/YAS) assays to evaluate endocrine-disrupting potential; assessment of 2,4-D/GSH mixtures.

Main Results:

• 2,4-D demonstrated toxicity against E. hormaechei and C. albicans, and genotoxicity in E. coli, with increased ROS synthesis.
• No estrogenic or androgenic activity was detected for 2,4-D in YES/YAS bioassays.
• Glutathione (GSH) supplementation significantly reduced 2,4-D's toxicity (7-16%) and genotoxicity (over 44%).

Conclusions:

• Oxidative stress is a key molecular mechanism underlying 2,4-D's toxicity and genotoxicity.
• Glutathione (GSH) effectively mitigates the adverse cellular effects of 2,4-D.
• Dietary intake of glutathione-rich foods or supplements may be crucial for cancer prevention against pesticide exposure.