Epithalon: Telomerase Activation and Senescence in Cell-Culture Studies

Epithalon (Epitalon) is a synthetic tetrapeptide (Ala-Glu-Asp-Gly) modeled on a fragment of epithalamin, a pineal-gland polypeptide extract originally characterized in the work of Khavinson and colleagues at the St. Petersburg Institute of Bioregulation and Gerontology [1]. Across multiple in vitro and in vivo systems, Epithalon has been used as a research probe for telomere biology, chromatin organization, and cellular senescence.

The most cited finding in the Epithalon literature is induction of telomerase activity in cultured human cells. Khavinson and colleagues reported that incubation of human fetal fibroblasts with Epithalon induced telomerase mRNA and protein expression and extended telomere length over serial passages — an effect not observed with scrambled-sequence control peptides [2]. Subsequent work using human somatic cell lines reproduced increases in hTERT expression following peptide exposure [3].

A separate strand of research has examined Epithalon’s effects on heterochromatin organization in senescent cells. Lezhava and colleagues reported that the peptide decondenses heterochromatin in lymphocytes from aged donors in vitro, restoring expression of genes silenced by age-associated chromatin remodeling [4].

In vivo studies in inbred rodent strains have linked long-term Epithalon administration to alterations in melatonin rhythmicity and circadian gene expression in the pineal gland [5]. In CBA mice carrying a high spontaneous tumor incidence, prolonged peptide exposure was associated with reduced incidence of mammary adenocarcinoma over the animals’ lifespan compared with vehicle controls [6].

Laboratory researchers typically reconstitute lyophilized Epithalon in bacteriostatic water for cell-culture work, with aliquots stored at −20 °C to maintain peptide integrity. Frontier Peptide Labs supplies a research-grade Epithalon vial with third-party HPLC analysis for laboratory research use only.

References

1. Khavinson VK. Peptides and ageing. Neuro Endocrinol Lett. 2002;23 Suppl 3:11-144. PubMed: 12466928
2. Khavinson VK, et al. Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells. Bull Exp Biol Med. 2003;135(6):590-2. PubMed: 12937682
3. Khavinson VK, Bondarev IE, Butyugov AA. Epithalon peptide induces telomerase activity and telomere elongation. Bull Exp Biol Med. 2003;135(6):590-592. DOI: 10.1023/A:1025493705728
4. Lezhava T, et al. Epitalon peptide activates chromatin in aged cells. 2011;12(2):157-63. PubMed: 21188485
5. Anisimov VN, et al. Effect of Epitalon on biomarkers of aging, lifespan and spontaneous tumor incidence in female CBA mice. Mech Ageing Dev. 2003;124(1):75-82. DOI: 10.1016/s0047-6374(02)00170-7
6. Anisimov VN, Khavinson VK. Peptide bioregulation of aging: results and prospects. 2010;11(2):139-49. PubMed: 19821130