2003 | Bulletin of Experimental Biology and Medicine | In Vitro / Human Cell Culture
Epithalon induces telomerase activity and telomere elongation in human somatic cells
Khavinson, Bondarev, and Butyugov investigated Epithalon's effect on telomerase expression and telomere length in human fetal fibroblast cultures. Epithalon treatment produced upregulation of the hTERT catalytic subunit, activation of telomerase, and measurable telomere elongation in cells that were telomerase-negative prior to treatment. The degree of telomere extension was sufficient for treated cells to surpass the Hayflick limit - the proliferative barrier imposed by critically short telomeres - extending the number of divisions the cells could undergo before entering senescence. This study established the foundational mechanistic rationale for Epithalon's investigation as a telomere-targeting compound in ageing research and has been cited extensively in subsequent longevity peptide literature.
Khavinson VK, Bondarev IE, Butyugov AA. Bull Exp Biol Med. 2003;135(6):590-592. PubMed →
2025 | Research Square (Preprint) / PMC | In Vitro / Human Cell Lines
Epitalon increases telomere length in human cell lines through telomerase upregulation or ALT activity
Al-dulaimi et al. conducted a systematic quantitative study of Epithalon's effects on telomere length, hTERT mRNA expression, telomerase enzyme activity, and ALT (Alternative Lengthening of Telomeres) activity across multiple human cell lines. In normal fibroblast and epithelial cells, Epithalon produced dose-dependent telomere extension through hTERT upregulation and telomerase activation - with 12-fold upregulation of hTERT expression at 1 μg/ml in 21NT cells. In cancer cells, where hTERT is already active, Epithalon instead activated ALT pathways for telomere maintenance, which the authors attributed to Epithalon's known binding to histone H1 and methylated cytosine, suggesting epigenetic rather than direct telomerase-mediated effects in those cell types. This study provided the most quantitatively detailed characterisation of Epithalon's telomere biology to date.
Al-dulaimi S, et al. PMC12411320. 2025. PMC →
1988 | FEBS Letters | In Vitro
GHK-Cu stimulates collagen synthesis in fibroblast cultures with activity beginning at 10⁻¹² M
Maquart et al. reported the foundational characterisation of GHK-Cu's effect on collagen synthesis in human fibroblast cultures. Collagen stimulation began at concentrations between 10⁻¹² and 10⁻¹¹ M, maximised at 10⁻¹ M, and was independent of any change in cell number - confirming the effect was on collagen production per cell rather than cell proliferation. The presence of a GHK triplet sequence in the alpha-2(I) chain of type I collagen led the authors to propose that GHK may be naturally liberated by proteases at wound sites, acting as an in situ repair signal. This study established GHK-Cu as a collagen synthesis stimulant and initiated four decades of tissue repair research on the compound.
Maquart FX, Pickart L, Laurent M, Gillery P, Monboisse JC, Borel JP. FEBS Lett. 1988;238(2):343-346. PubMed →
2018 | Frontiers in Pharmacology | Review / Gene Expression Analysis
GHK-Cu modulates over 4,000 human genes and exerts protective actions across multiple tissue systems
Pickart and Margolina synthesised the genomic and pharmacological literature on GHK-Cu, drawing on gene expression databases to identify the breadth of GHK's regulatory influence. GHK was found to modulate expression of more than 4,000 human genes, including those involved in collagen and elastin synthesis, angiogenesis, metalloproteinase regulation, anti-inflammatory signalling, DNA repair, antioxidant response, and cell cleansing via the proteasome system. The authors highlighted GHK's ability to suppress NFkB (a key driver of inflammation-associated ageing) and its neuroprotective effects in cognitive ageing models. The review characterised GHK as a naturally occurring systemic repair signal that declines with age, making its restoration a target of interest in ageing biology research.
Pickart L, Margolina A. Front Pharmacol. 2018;9:438. PubMed →
2021 | Nature Communications | Animal Study + Human Observation
MOTS-C is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis
Reynolds et al. published the landmark characterisation of MOTS-C as an exercise-regulated mitochondrial peptide with direct effects on ageing. In mice, MOTS-C administration significantly enhanced physical performance across young (2 months), middle-aged (12 months), and old (22 months) subjects. Late-life treatment (initiated at 23.5 months) increased physical capacity and healthspan. In human subjects, exercise induced MOTS-C expression in skeletal muscle by 11.9-fold and in circulation by 1.5-fold. MOTS-C was shown to regulate nuclear genes related to metabolism and proteostasis, improve skeletal muscle glucose and amino acid metabolism, and enhance myoblast adaptation to metabolic stress. The study established MOTS-C as the first mitochondrially encoded peptide demonstrated to actively regulate physical ageing, and provided the human physiological evidence for its role as an exercise-induced metabolic signal whose endogenous levels decline with age.
Reynolds JC, et al. Nat Commun. 2021;12(1):470. PubMed →
2015 | Cell Metabolism | Animal Study
MOTS-C promotes metabolic homeostasis and reduces obesity and insulin resistance via AMPK pathway
Lee et al. characterised MOTS-C's metabolic effects in the foundational study establishing this peptide's role in metabolism. MOTS-C was shown to act primarily through the Folate-AICAR-AMPK pathway, increasing glucose uptake and stimulating glycolysis in skeletal muscle. In high-fat diet mice, MOTS-C prevented weight gain, reduced insulin resistance, and improved metabolic parameters without caloric restriction. The peptide regulated nuclear gene expression by translocating from mitochondria to the nucleus under stress conditions, identifying it as a novel retrograde mitochondrial-to-nuclear signal. The study's framing of MOTS-C as an "exercise mimetic" - a compound that activates the same metabolic pathways induced by physical activity via AMPK - established the basis for its investigation in ageing-related metabolic decline.
Lee C, et al. Cell Metab. 2015;21(3):443-454. PubMed →
