Relationship between reactive oxygen species and sodium-selenite-induced DNA damage in HepG2 cells

Area of Science:

• Biochemistry
• Cell Biology
• Toxicology

Background:

• Selenium compounds, including selenite, are recognized for their chemopreventive properties and ability to induce apoptosis in tumor cells.
• Reactive oxygen species (ROS) are critical signaling molecules involved in apoptosis triggered by various agents, including chemopreventives.

Purpose of the Study:

• To investigate the correlation between reactive oxygen species (ROS) and the extent of DNA damage induced by selenite in HepG2 cells.
• To elucidate the role of ROS in selenite-mediated cytotoxicity and DNA damage.

Main Methods:

• HepG2 cells were treated with varying doses of selenite.
• Cell viability was assessed.
• ROS levels were quantified using 2', 7'-dichlorofluorescein diacetate (DCFH-DA) fluorescence.
• DNA damage was evaluated.
• The effects of N-acetylcysteine (NAC), an antioxidant, were examined.

Main Results:

• Selenite exposure resulted in a dose-dependent reduction in HepG2 cell viability.
• Selenite treatment led to a dose- and time-dependent increase in intracellular ROS levels.
• DNA damage in HepG2 cells increased with escalating selenite concentrations.
• N-acetylcysteine (NAC) administration enhanced cell viability, diminished ROS generation, and significantly inhibited selenite-induced DNA damage.

Conclusions:

• Reactive oxygen species (ROS) play a significant role in mediating DNA damage induced by selenite in HepG2 cells.
• The antioxidant N-acetylcysteine (NAC) can mitigate selenite-induced DNA damage, suggesting a therapeutic potential for ROS modulation in selenium-related toxicity.