Description
Epitalon (Epithalon) Research Peptide (10 mg)
Epitalon (Ala-Glu-Asp-Gly) is a synthetic tetrapeptide developed by Professor Vladimir Khavinson and colleagues at the St. Petersburg Institute of Bioregulation and Gerontology as a structurally defined analogue of epithalamin—a polypeptide extract isolated from the bovine pineal gland. Epithalamin had demonstrated bioregulatory activity in earlier experimental gerontology research, and Epitalon was developed to provide a chemically characterized, reproducible molecular tool for investigating its underlying mechanisms.
Epitalon has been characterized across a substantial body of peer-reviewed research, primarily conducted in cell culture systems and rodent models, examining telomere biology, neuroendocrine regulation, antioxidant signaling, and epigenetic modulation within the context of cellular aging research.
Structural Characteristics
Epitalon is a linear tetrapeptide with the sequence Ala-Glu-Asp-Gly, comprising four amino acid residues with a free N-terminal amine and C-terminal carboxylate. Its compact structure—molecular weight approximately 390 Da—places it among the smallest bioactive peptides characterized in gerontological research.
The peptide’s acidic residues (glutamate at position 2 and aspartate at position 3) have been proposed to facilitate interactions with chromatin-associated proteins and transcription regulatory complexes, consistent with observed epigenetic effects documented in in-vitro model systems. Its small size and linear structure contribute to favorable aqueous solubility and stability under standard lyophilized storage conditions.
Characterized Signaling Pathways
Published research has identified multiple cellular and molecular interactions:
Telomerase Activation (hTERT Upregulation)
In-vitro studies in human fetal fibroblast cell lines demonstrated that Epitalon treatment increased telomerase activity and upregulated expression of the catalytic subunit hTERT, correlating with extended cellular replicative lifespan and attenuated telomere shortening across successive cell divisions (Khavinson et al., Bulletin of Experimental Biology and Medicine, 2003). This represents the most extensively cited mechanistic finding in the Epitalon research literature.
Pineal Gland / Melatonin Biosynthesis Regulation
Animal model studies demonstrated that Epitalon administration restored age-associated decline in pineal melatonin secretion in elderly rats, normalizing circadian melatonin rhythm amplitude toward levels observed in younger controls. This effect was associated with upregulation of hydroxyindole-O-methyltransferase (HIOMT), a key enzyme in melatonin biosynthesis (Khavinson & Anisimov, Neuroendocrinology Letters, 2000).
Epigenetic Modulation / Chromatin Remodeling
Research using spectroscopic and molecular modeling analyses indicates Epitalon interacts with core histone proteins and chromatin-associated complexes, influencing DNA methylation patterns and heterochromatin organization. These interactions have been proposed as a mechanism through which the peptide may influence gene expression programs associated with cellular senescence (Vanyushin et al., Biochemistry (Moscow), 2014).
Antioxidant Signaling and ROS Attenuation
Studies in aged rodent models demonstrated that Epitalon treatment reduced markers of oxidative stress, including lipid peroxidation products (MDA) and protein carbonylation, while upregulating superoxide dismutase (SOD) and catalase activity. These effects were observed in multiple tissue compartments including brain, liver, and erythrocytes (Khavinson et al., Gerontology, 2007).
Research Applications
Epitalon has been utilized as a molecular probe in controlled experimental systems examining:
- Telomere biology and cellular replicative senescence models
- Telomerase activity and hTERT expression regulation
- Pineal gland neuroendocrine function and melatonin biosynthesis
- Circadian rhythm and neuroendocrine aging models
- Epigenetic regulation and chromatin remodeling research
- Oxidative stress and antioxidant enzyme systems
- Cellular aging and bioregulatory peptide biology
