Epitalon and Telomerase

Epitalon (also written Epithalon) is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. It was designed in the 1990s at the St. Petersburg Institute of Bioregulation and Gerontology as the active core of Epithalamin, a polypeptide extract of the bovine pineal gland. The research program around Epitalon centers on pineal regulation, circadian biology, and the telomere–telomerase system in aging models.

Telomeres and Telomerase

Telomeres are repetitive TTAGGG DNA caps at the ends of linear chromosomes. They shorten with each somatic cell division and, when critically short, trigger replicative senescence. Telomerase is a ribonucleoprotein reverse transcriptase (TERT + TERC) that adds telomeric repeats and is normally active in germ cells, stem cells, and most cancers, but is suppressed in most somatic tissues.

Reported Effects of Epitalon

• Telomerase activation in somatic cells: Khavinson and colleagues reported that Epitalon induced telomerase activity and elongated telomeres in human somatic fetal fibroblasts in vitro (Khavinson et al., Bull Exp Biol Med, 2003).
• Lifespan and tumor incidence in rodents: Chronic administration in CBA mice was associated with increased mean lifespan and reduced spontaneous tumor incidence in long-running Russian cohorts (Anisimov et al., Mech Ageing Dev, 2003).
• Melatonin and circadian rhythm: Restoration of nocturnal melatonin secretion and pineal function in aged primates (Khavinson et al., Neuro Endocrinol Lett, 2001).
• Gene expression and chromatin: Modulation of expression of genes involved in cell-cycle control and antioxidant defense, with proposed direct binding to DNA promoter regions.

Limitations of the Evidence

Most published Epitalon research originates from a small number of laboratories, with limited independent replication outside Russia. There are no large randomized human trials, and pharmacokinetic data in humans is sparse. Native short peptides like Ala-Glu-Asp-Gly are also rapidly degraded by serum peptidases, raising open questions about systemic exposure and the molecular target responsible for the reported effects.

Regulatory Status

Epitalon is not approved by the US FDA or EMA for any indication. It is supplied strictly as a reference compound for in-vitro and preclinical laboratory research.

References

• Khavinson VK, et al. Peptide promotes overcoming of the division limit in human somatic cell. Bull Exp Biol Med. 2003;135(6):590–592.
• Anisimov VN, Khavinson VK, et al. Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female CBA mice. Mech Ageing Dev. 2003;124(4):549–557.
• Khavinson VK, et al. Effect of Epitalon on the age-related changes in melatonin and circadian rhythms in rhesus monkeys. Neuro Endocrinol Lett. 2001;22(4): 251–254.
• Blackburn EH, Epel ES, Lin J. Human telomere biology: A contributory and interactive factor in aging, disease risks, and protection. Science. 2015;350(6265): 1193–1198.