Short Peptides Pinealon, Vesugen, Vilon, and Epitalon Show Protective Cellular Effects In Vitro

Cellular aging and damage are often linked to oxidative stress, a state where an imbalance of reactive oxygen species (ROS) can harm vital cell components like lipids and proteins. While many compounds are explored for their antioxidant properties, the specific role of naturally occurring regulatory peptides in cellular protection, particularly beyond direct antioxidant action, remains an active area of research. This study specifically investigated the biological activities of several short regulatory peptides in various in vitro models to understand their potential protective mechanisms.

The study revealed that while these peptides demonstrated no direct antioxidant activity, they were highly effective in other protective mechanisms. They were found to restrict lipid peroxidation of human lipoproteins by modifying their structure, indicating an indirect protective effect against oxidative damage. Furthermore, the peptides increased the stability of red blood cell membranes toward osmotic hemolysis, suggesting a significant membrane-stabilizing role. Intriguingly, they also elevated the stationary level of intracellular reactive oxygen species, a finding that might seem counterintuitive but could be part of a beneficial signaling pathway. Crucially, all peptides except epitalon decreased the percentage of dead cells in neuronal populations, highlighting a significant neuroprotective effect.