Livagen peptide boosts protein synthesis and rhythm amplitude in aged rat hepatocytes

The decline in cellular function with age is a fundamental aspect of aging, often manifesting as reduced metabolic activity and impaired regenerative capacity. Protein synthesis, a cornerstone of cellular maintenance and repair, is particularly vulnerable to age-related dysregulation, impacting tissue vitality and overall organismal health. Current anti-aging strategies often lack targeted approaches to restore fundamental cellular processes like protein synthesis rhythms. Understanding how specific peptides can modulate these rhythms, especially in vital organs like the liver, offers a promising avenue for developing interventions to combat age-associated cellular decline and maintain hepatic function.

Researchers investigated the effect of peptides on protein synthesis rhythms in a monolayer culture of hepatocytes isolated from rats ranging in age from 1 to 24 months, weighing 45 to 480 g. They determined the circumhoralian rhythm of protein synthesis in these cultures. The study then assessed the impact of Livagen (Lys-Glu-Asp-Ala), a peptide derived from liver polypeptide analysis, and Epitalon (Ala-Glu-Asp-Gly), a pineal gland-derived peptide, on the level and rhythm of protein synthesis. The intervention involved adding the peptides to the cultured hepatocytes, with untreated cells serving as a control arm.

Livagen (Lys-Glu-Asp-Ala) consistently increased the level of protein synthesis across all age groups of rat hepatocytes. The most pronounced effect of Livagen was observed in cells derived from old animals, suggesting an age-specific enhancement of cellular anabolic processes. Specifically, in hepatocytes from old rats, Livagen not only boosted overall synthesis but also significantly increased the amplitude of protein synthesis fluctuations, indicating a restoration or enhancement of the natural circumhoralian rhythm. This suggests Livagen may help re-establish more robust cellular rhythms in aged tissues. In contrast, Epitalon (Ala-Glu-Asp-Gly), a peptide constructed from epiphysis analysis, demonstrated no discernible change in the intensity of protein synthesis within the cultured hepatocytes, highlighting the specificity of Livagen's action. This differential effect underscores Livagen's unique potential in modulating liver cell metabolism.

Livagen significantly increased the amplitude of protein synthesis fluctuations in hepatocytes from old rats, suggesting a restoration of youthful cellular rhythms.