Oxidative Stress in Methylmercury-Induced Cell Toxicity

Area of Science:

• Environmental toxicology
• Neurotoxicology
• Molecular toxicology

Background:

• Methylmercury (MeHg) is a potent neurotoxicant accumulating in humans via diet.
• MeHg toxicity mechanisms are not fully understood, but oxidative stress is implicated.
• The central nervous system (CNS) is the primary target for MeHg toxicity.

Purpose of the Study:

• To review the interaction of MeHg with antioxidant response systems.
• To highlight the role of MeHg in redox imbalance.
• To discuss the involvement of specific signaling pathways in MeHg toxicity.

Main Methods:

• Literature review focusing on MeHg interactions with thiol/selenol-rich molecules.
• Analysis of MeHg's impact on glutathione (GSH) and selenoenzymes (TrxR, Gpx).
• Examination of the PI3K/Akt pathway and Nrf2 in MeHg-induced redox imbalance.

Main Results:

• MeHg interacts with nucleophilic groups in proteins and molecules, inducing oxidative stress.
• MeHg disrupts antioxidant systems, including GSH, TrxR, and Gpx.
• MeHg modulates cellular signaling pathways like PI3K/Akt and Nrf2, contributing to redox imbalance.

Conclusions:

• Oxidative stress is a key mechanism in MeHg neurotoxicity.
• MeHg disrupts crucial antioxidant regulators and signaling pathways.
• Understanding these interactions is vital for assessing MeHg health risks.