Pinealon Increases Cell Viability by Suppression of Free Radical Levels and Activating Proliferative Processes

This study investigated the mechanisms by which the tripeptide pinealon (Glu-Asp-Arg, or EDR) promotes cell survival under oxidative stress conditions. Using neural cell cultures subjected to oxidative stress with hydrogen peroxide and other oxidizing agents, the researchers evaluated the protective effects of pinealon at different concentrations.

The results demonstrated that pinealon exerted a dose-dependent suppression of reactive oxygen species (ROS) levels in neural cells under oxidative stress. Cells treated with pinealon showed significantly higher viability compared to controls, indicating a robust cytoprotective effect.

At the molecular level, pinealon acted through specific mechanisms:

• Activation of the ERK 1/2 pathway (extracellular signal-regulated kinases), a signaling cascade fundamental to cell survival and proliferation
• Cell cycle modification, promoting the transition from quiescent to proliferative phases
• Direct reduction of intracellular free radical levels

A notable aspect of the study is that pinealon, being an extremely small tripeptide (only 3 amino acids), can exert significant biological effects. The proposed mechanism involves peptide penetration into the cell nucleus, where it can directly interact with DNA and modulate gene expression. These findings provide support for the potential use of pinealon as a neuroprotective agent in conditions associated with oxidative stress, such as neurodegenerative diseases and brain aging.