The short version of Telomerase induction fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-09 and is reviewed periodically as new material appears.
Epitalon emerged from research conducted in Saint Petersburg by Vladimir Khavinson and colleagues, who studied short peptides as potential regulators of aging. The work built on epithalamin, a pineal gland extract reported to influence neuroendocrine function. Epitalon was designed as a synthetic counterpart with a defined sequence, allowing reproducible experiments that extracts could not support. Early publications described effects on melatonin rhythms and lifespan in animal models. These findings circulated mainly in Russian-language journals during the 1990s, which limited their visibility among English-speaking researchers.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
| Property | Value | Notes |
|---|---|---|
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Compound class | Synthetic tetrapeptide | Not a natural free peptide |
| Research origin | Russian gerontology institutes | Developed during the 1990s |
| Main research claim | Telomerase activation | Evidence mainly from cultured cells |
| Regulatory status | Not an approved drug | Handled as a research material |
Typical storage for the lyophilized powder is −20 °C or lower, in a sealed container protected from light and moisture. Hygroscopic material should be allowed to equilibrate to room temperature before the vial is opened, which limits condensation on the contents. Working solutions are commonly divided into single-use aliquots and frozen to avoid repeated freeze-thaw cycles. Dilute solutions are more prone to adsorption onto plastic surfaces and to loss during filtration, so procedures that minimize transfers and use low-binding labware are preferable.
Reversed-phase high-performance liquid chromatography is the standard approach for assessing purity, usually with ultraviolet detection near 214 nm, where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the molecular mass and helps reveal truncation or deletion byproducts. Amino acid analysis can verify composition, and counterion content is sometimes measured because peptides purified with trifluoroacetic acid retain variable amounts of that salt. Purity figures reported without a stated method and detection wavelength are difficult to interpret.
Material sold for research use varies widely in documented quality. A useful verification package includes a certificate of analysis that states peptide content rather than only net weight, the chromatographic method and column used, and a mass spectrum consistent with the expected mass. Independent testing by a third-party laboratory is occasionally reported. Statements of identity resting only on a supplier label provide little assurance, and the gap between nominal mass and actual peptide content can be substantial once counterions and residual water are counted.
The most frequently cited proposed action is induction of telomerase, the enzyme that adds repeat sequences to chromosome ends. Cell-culture work from the originating group reported higher telomerase reverse transcriptase expression and measurable telomere elongation in human somatic cells after exposure. How a four-residue peptide would reach nuclear gene regulation is not established, and no cell-surface receptor or uptake route has been identified. Additional reports describe changes in melatonin secretion, antioxidant enzyme activity and lipid peroxidation in aged animals, but these findings remain mechanistically unconnected to the telomerase observation.
Published evidence comes mainly from Russian-language journals and from a single research group, with small sample sizes and limited independent replication. A few laboratories outside that group have examined related peptides and reported weaker or absent telomerase effects, so the central claim is best described as contested rather than settled. Rodent studies report modest changes in some ageing markers and in survival, but designs vary and control conditions are often sparse. No large randomised trial in humans has been published, and long-term safety data in healthy populations are correspondingly thin.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
== Motivation == While one-place studies in Britain are often pursued for simple enjoyment, amateur one-place studies in continental nations sometimes assert their value to social science. The introduction to a recent survey of German one-place studies listed the following topics that were likely to benefit from the research:
Beta-actin, or Actin beta (HUGO Gene Nomenclature Committee abbreviation ACTB/ACTB) is one of six different actin isoforms which have been identified in humans. This is one of the two nonmuscle cytoskeletal actins. Actins are highly conserved proteins that are involved in cell motility, structure and integrity. Alpha actins are a major constituent of the contractile apparatus.
== Research == As of March 2019, oral levoketoconazole (developmental code name COR-003, tentative brand name Recorlev) is phase III clinical trials for the treatment of Cushing's syndrome. Oral levoketoconazole may have a lower risk of liver toxicity than oral ketoconazole.
== Function == CD38 can function either as a receptor or as an enzyme. As a receptor, CD38 can attach to CD31 on the surface of T cells, thereby activating those cells to produce a variety of cytokines. CD38 activation cooperates with TRPM2 channels to initiate physiological responses such as cell volume regulation. CD38 is also a component of the B-cell co-receptor complex, where it associates with CD19. It plays an essential role in regulating B-cell receptor (BCR) signaling, thereby influencing B-cell activation upon antigenic recognition. CD38 is a multifunctional enzyme that catalyzes the synthesis of ADP ribose (ADPR) (97%) and cyclic ADP-ribose (cADPR) (3%) from NAD+. CD38 is thought to be a major regulator of NAD+ levels, its NADase activity is much higher than its function as an ADP-rybosyl-cyclase: for every 100 molecules of NAD+ converted to ADP ribose it generates one molecule of cADPR. When nicotinic acid is present under acidic conditions, CD38 can hydrolyze nicotinamide adenine dinucleotide phosphate (NADP+) to NAADP. These reaction products are essential for the regulation of intracellular Ca2+. CD38 occurs not only as an ectoenzyme on cell outer surfaces, but also occurs on the inner surface of cell membranes, facing the cytosol performing the same enzymatic functions. CD38 is believed to control or influence neurotransmitter release in the brain by producing cADPR. CD38 within the brain enables release of the affiliative neuropeptide oxytocin.
Sources: en.wikipedia.org
==== Distribution ==== Psilocin, the active form of psilocybin, is extensively distributed to all tissues through the bloodstream. Its volume of distribution is 505 to 1,267 L. Psilocybin itself is hydrophilic due to its phosphate group and cannot easily cross the blood–brain barrier. Conversely, psilocin is lipophilic and readily crosses the blood–brain barrier to exert effects in the central nervous system. The plasma protein binding of psilocybin is 66% and hence it is moderately plasma protein-bound.
=== Emulsification === Due to the hydrophilic property of sucrose and the lipophilic property of fatty acids, the overall hydrophilicity of sucrose esters can be tuned by the number of hydroxyl groups that are reacted with fatty acids and the identity of the fatty acids. The fewer free hydroxyl groups and the more lipophilic fatty acids, the less hydrophilic the resulting sucrose ester becomes. Sucrose esters' HLB values can range from 1-16. Low HLB (3.5-6.0) sucrose esters act as a water-in-oil emulsifier while high HLB (8-18) sucrose esters act as an oil-in-water emulsifier.
== Bare lymphocyte syndrome == One type of MHC class II deficiency, also called bare lymphocyte syndrome, is due to mutations in the genes that code for transcription factors that regulate the expression of the MHC class II genes. It results in the depletion of CD4 T cells and some immunoglobulin isotypes even though there are normal levels of both CD8 T cells and B cells present. Deficient MHC class II molecules are unable to present antigens to T cells and properly activate T cells. T cells are then unable to proliferate and secrete cytokines which normally participate in the immune response. Not only do the deficient MHC class II molecules affect the activation and proliferation of T cells but also the rest of the immune response cascade which includes B cells. Therefore, with this decrease in the number of T cells, the T cells cannot interact and activate the B cells. Normally when B cells are activated they divide, proliferate and differentiate, which includes the differentiation of these cells into plasma cells which are responsible for producing antibodies. However, when there is a deficiency in MHC class II molecules B cells are not activated and cannot differentiate into plasma cells which causes them to be deficient in antibodies which are unable to perform as they are expected. The only current form of treatment is a bone-marrow transplant; however, even this does not cure the disease and most patients do not live past age ten.
Sources: en.wikipedia.org
rate of growth Doubling time of less than one month: sarcoma/infection/infarction/vascular Doubling time of six to 18 months: benign tumor/malignant granuloma Doubling time of more than 24 months: benign nodule neoplasm calcification margin smooth lobulated presence of a corona radiata shape site If the nodules are multiple, the differential is then smaller:
== Pathology == The microscopic histopathology of hematoxylin and eosin stained FBS tumors varies. Lower-grade MFS tissues consist of scattered large, variability-sized and spindle-shaped-to-variably-shaped tumor cells with darkly stained nuclei. Overall, lower-grade tumors contain relatively few cells within a distinctive myxoid (i.e. more blue or purple compared to normal connective tissue because of excessive uptake of the hematoxylin stain) connective tissue background that contains curvilinear, thin-walled blood vessels. Higher grade FBS tumors consist of relatively large sheets of these spindle-shaped/vatiably-shaped cells in a similar myxoid background containing thin-walled curvilinear blood vessels. Pseudo-lipoblasts (i.e. multivacuolated cells resembling lipoblasts but having vacuoles filled with mucin rather than lipids) are apparent in both lower grade and higher grade tumors. Epithelioid FBS tumors are highly cellular lesions consisting of diffuse proliferations of extremely large, polygonal-shaped epithelioid cells set in a myxoid connective tissue background similar to that seen in the other types of FBS. Epithelioid myxofibrosarcomas appear to behave more aggressively than myxofibrosarcomas dominated by spindle-shaped/variably-shaped cells. While the cells in most types of tumors express specific marker proteins that help in diagnosing them, the tumor cells in FBS and its epithelioid variant have not yet been found to express marker proteins that are sufficiently specific to support either diagnosis.
medical physicists and biochemists) for medical research projects, but it is becoming clear that it also has the ability to give doctors useful clinical information, especially with the discovery that it can be used to probe the concentration of alpha-Hydroxyglutaric acid, which is only present in IDH1 and IDH2 mutated gliomas, which alters the prescribed treatment regimen. MRS is currently used to investigate a number of diseases in the human body, most notably cancer (in brain, breast and prostate), epilepsy, Alzheimer's disease, Parkinson's disease, and Huntington's chorea. MRS has been used to diagnose pituitary tuberculosis. Prostate cancer: Combined with a magnetic resonance imaging (MRI) and given equal results, then the three-dimensional MRS can predict the prevalence of a malignant degeneration of prostate tissue by approximately 90%. The combination of both methods may be helpful in the planning of biopsies and therapies of the prostate, as well as to monitor the success of a therapy.
[T]o promote the full flow of commerce, to prescribe the legitimate rights of both employees and employers in their relations affecting commerce, to provide orderly and peaceful procedures for preventing the interference by either with the legitimate rights of the other, to protect the rights of individual employees in their relations with labor organizations whose activities affect commerce, to define and proscribe practices on the part of labor and management which affect commerce and are inimical to the general welfare, and to protect the rights of the public in connection with labor disputes affecting commerce. The amendments enacted in Taft–Hartley added a list of prohibited actions, or unfair labor practices, on the part of unions to the NLRA, which had previously only prohibited unfair labor practices committed by employers. The Taft–Hartley Act prohibited jurisdictional strikes, wildcat strikes, solidarity or political strikes, secondary boycotts, secondary and mass picketing, closed shops, and monetary donations by unions to federal political campaigns. It also required union officers to sign non-communist affidavits with the government. Union shops were heavily restricted, and states were allowed to pass right-to-work laws that ban agency fees. Furthermore, the executive branch of the federal government could obtain legal strikebreaking injunctions if an impending or current strike imperiled the national health or safety.
Sources: en.wikipedia.org
Vladimir Khavinson and colleagues at research institutes in Saint Petersburg developed and studied the peptide. Their program examined short peptides as regulators of aging and neuroendocrine function. Epitalon was one of several compounds produced by that group.
That question is not settled. Cell culture studies have reported increased telomerase activity after treatment, but comparable evidence from controlled human trials is lacking. Any claim about telomere lengthening in people should be treated as unproven.
It has not completed the large, controlled trials required for drug approval in major jurisdictions. Most human reports involve small samples and limited follow-up. As a result, it is sold as a research chemical rather than a licensed pharmaceutical product.
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.