A practical reference on AEDG tetrapeptide: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-08-27 and is reviewed periodically as new material appears.
Published work on this compound consists mainly of in vitro experiments, animal studies, and small clinical investigations, a substantial share of which appeared in Russian-language journals. Sample sizes are generally small, control conditions differ between studies, and several endpoints rely on markers whose clinical meaning is itself debated. Reviews of the longevity field treat the peptide as an early example of telomerase-directed research rather than an established intervention. Regulatory treatment varies by country: some jurisdictions place it under prescription controls, others treat it as a laboratory material, and importation may be restricted regardless of local status.
Epitalon is a synthetic tetrapeptide whose sequence is alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. It was developed in Russia during the 1980s and 1990s by investigators associated with the St. Petersburg Institute of Bioregulation and Gerontology, who studied short peptides as regulators of gene expression and tissue function. The alternative spelling epithalon appears interchangeably in the literature, and the two names refer to the same molecule. Outside Russia it is encountered chiefly as a research chemical rather than a licensed medicine, and it holds no approval from the United States Food and Drug Administration or the European Medicines Agency.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Peptide sequence | Ala-Glu-Asp-Gly | Often abbreviated AEDG in research literature |
| Common synonyms | Epithalon, epitalon, AEDG | Spelling variants refer to the same tetrapeptide |
| Molecular formula | C14H22N4O9 | Theoretical monoisotopic mass near 390.35 Da |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility class | Freely soluble in water | Hydrophilic peptide; dissolves in aqueous buffer |
The proposed relationship between epitalon and pineal function is a central part of its background. Khavinson's group reported that short peptides corresponding to regions of larger pineal proteins could influence gene expression in cells. Epitalon was framed as a synthetic analogue of an active fragment rather than a direct isolation product. Whether the tetrapeptide reproduces the effects of the parent extract is an open question, because comparative studies are limited and the parent extract itself is not a single defined substance.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
Laboratory work has examined effects on telomerase activity in cultured cells, on melatonin rhythms in animals, and on markers of oxidative stress. Some experiments report measurable changes while others show none, and the reported findings rest largely on small studies. The absence of large independent trials means the generality of these results is unresolved rather than settled. Review articles occasionally apply the label geroprotector, a term that reflects a research hypothesis about ageing rather than an established clinical finding.
Epitalon is the common name for a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, usually abbreviated AEDG. All four residues are proteinogenic amino acids, and the free peptide has a calculated mass near 390 grams per mole. Because the chain is short and carries no modifications, it is assembled readily by solid-phase synthesis and is distributed mainly as a freeze-dried solid for laboratory work. Catalogue listings use the spellings epitalon, epithalone, and simply AEDG, and the three refer to the same sequence.
Neutrophil Neutrophils are the most common white blood cells in normal adult blood. When stained with a Romanowsky stain, they exhibit a multi-lobed nucleus and pink cytoplasm that contains small purple granules. The neutrophil count is normally higher in newborns and pregnant women than in other groups. Outside of these conditions, increased neutrophil counts (neutrophilia) are associated with bacterial infection, inflammation, and various forms of physiological stress. Neutrophil counts can become extremely high in response to some infections and inflammatory states, which is termed leukemoid reaction because the high white blood cell count mimics leukaemia. Neutrophilia may also occur in myeloproliferative disorders.Neutropenia, meaning a low neutrophil count, may occur as a response to drug treatment (especially chemotherapy) or in certain infections, such as tuberculosis and Gram-negative sepsis. Neutropenia also occurs in many hematologic disorders, such as leukaemia and myelodysplastic syndrome, and in a variety of autoimmune and congenital diseases. A neutrophil count below the reference interval may be normal in individuals of certain ethnicities; this is termed benign ethnic neutropenia. Very low neutrophil counts are associated with immunosuppression. When stimulated by infection or inflammation, neutrophils may develop abnormal features in their cytoplasm, such as toxic granulation, toxic vacuolation and Döhle bodies. These features, which are caused by the release of cytokines, are collectively known as toxic changes.
== Trade names == Common trade names include Centrac, Centrax, Demetrin, Lysanxia, Mono Demetrin, Pozapam, Prasepine, Prazene, Reapam and Trepidan. Trade names vary depending on the country; Austria: Demetrin, Belgium: Lysanxia, France: Lysanxia, Germany: Demetrin; Mono Demetrin, Greece: Centrac, Ireland: Centrax, Italy: Prazene; Trepidan, Macedonia: Demetrin, Prazepam, Netherlands: Reapam, Portugal: Demetrin, South Africa: Demetrin, Switzerland: Demetrin, Thailand: Pozapam; Prasepine.
== History == The GCCA was formed in 2007 through the merger of two processor organizations and was joined by a number of other core partners that became part of the alliance. The merger was between the International Association of Refrigerated Warehouses (IARW) formed in 1891, the International Refrigerated Transportation Association (IRTA) formed in 1994.
=== Rocks === These are asteroids and other non-planetary bodies hollowed out for habitation and usually spun for centrifugal artificial gravity. Rocks (with the exception of those used for secretive purposes) are described as having faster-than-light space drives, and thus can be considered a special form of spaceship. Like Orbitals, they are usually administered by one or more Minds. Rocks do not play a large part in most of the Culture stories, though their use as storage for mothballed military ships (Pittance) and habitats (Phage Rock, one of the founding communities of the Culture) are both key plot points in Excession.
Donna M. Wolk is an American microbiologist who is Director of Clinical Microbiology at the Geisinger Health System. In 2017, she was honored by the American Society for Microbiology for her efforts to improve patient care using microbiology.
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== Science and technology == 1,2-Ethanedithiol, compound commonly used for cleavage during peptide synthesis EDT (Digital), text editor for PDP-11 and VAX/VMS computer systems EDT (Univac), text editor for UNIVAC Series 90 and Fujitsu BS2000 computer systems Electrodynamic tether, a spacecraft component Event dispatching thread, in Java
=== Structure determination === Discovering the tertiary structure of a protein, or the quaternary structure of its complexes, can provide important clues about how the protein performs its function and how it can be affected, i.e. in drug design. As proteins are too small to be seen under a light microscope, other methods have to be employed to determine their structure. Common experimental methods include X-ray crystallography and NMR spectroscopy, both of which can produce structural information at atomic resolution. However, NMR experiments are able to provide information from which a subset of distances between pairs of atoms can be estimated, and the final possible conformations for a protein are determined by solving a distance geometry problem. Dual polarisation interferometry is a quantitative analytical method for measuring the overall protein conformation and conformational changes due to interactions or other stimulus. Circular dichroism is another laboratory technique for determining internal β-sheet / α-helical composition of proteins. Cryoelectron microscopy is used to produce lower-resolution structural information about very large protein complexes, including assembled viruses; a variant known as electron crystallography can produce high-resolution information in some cases, especially for two-dimensional crystals of membrane proteins.
Having a front end means that this part of the body encounters stimuli, such as food, favouring cephalisation, the development of a head with sense organs and a mouth. Many bilaterians have a combination of circular muscles that constrict the body, making it longer, and an opposing set of longitudinal muscles, that shorten the body; these enable soft-bodied animals with a hydrostatic skeleton to move by peristalsis. They also have a gut that extends through the basically cylindrical body from mouth to anus. Many bilaterian phyla have primary larvae which swim with cilia and have an apical organ containing sensory cells. However, over evolutionary time, descendant spaces have evolved which have lost one or more of each of these characteristics. For example, adult echinoderms are radially symmetric (unlike their larvae), while some parasitic worms have extremely simplified body structures. Genetic studies have considerably changed zoologists' understanding of the relationships within the Bilateria. Most appear to belong to two major lineages, the protostomes and the deuterostomes. It is often suggested that the basalmost bilaterians are the Xenacoelomorpha, with all other bilaterians belonging to the subclade Nephrozoa. However, this suggestion has been contested, with other studies finding that xenacoelomorphs are more closely related to Ambulacraria than to other bilaterians.
== Epidemiology == Ehlers–Danlos syndromes are estimated to occur in about one in 5,000 births worldwide. Initially, prevalence estimates ranged from one in 250,000 to 500,000 people, but these were soon found to be low, as medical professionals became more adept at diagnosis. EDS may be far more common than the currently accepted estimate due to the wide range of severities with which the disorder presents. The prevalence of the disorders differs dramatically. The most common is hypermobile EDS, followed by classical EDS. The others are very rare. For example, fewer than 10 infants and children with dermatosparaxis EDS have been described worldwide. Some types of EDS are more common in Ashkenazi Jews. For example, the chance of being a carrier for dermatosparaxis EDS is one in 2,000 in the general population but one in 248 among Ashkenazi Jews. Some recent studies have found that EDS is significantly more prevalent in people who identify as transgender or gender-diverse, or who suffer from gender dysphoria. One review, of a pediatric EDS clinic in the American Midwest between 2020 and 2022, found that 17% of patients identified as trans or gender-diverse, 89% of whom were assigned female at birth. By comparison, roughly 1–2% of adolescents identify as trans or gender-diverse in the US overall. In a 2020 study, among adults undergoing gender-affirming surgery, 2.6% had a diagnosis of EDS—130 times the highest reported prevalence of EDS in the general population.
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Multiple historic and cultural sites, including UNESCO World Heritage Sites, were damaged. The most affected was Chehel Sotoun and its rich ayeneh-kari. On 2 March, a strike on Arg Square damaged nearby Golestan Palace, prompting UNESCO to issue a statement of concern. On 5 March, the Azadi Sport Complex was bombed. An 8 March strike on Falak-ol-Aflak, which was marked with a blue shield emblem, damaged several sections of the site. Strikes on Isfahan on 9 March damaged Naqsh-e Jahan Square, Chehel Sotoun, Ali Qapu, the Shah Mosque, Jameh Mosque, and Teymouri Hall. On 11 March, UNESCO urged protection for Iran's heritage sites and World Heritage Sites that have been damaged or are under high risk due to the war, alongside other historic sites in Israel, Lebanon, and the rest of West Asia. On 17 March, blast waves and shrapnel damaged multiple palaces at Sa'dabad Complex in northern Tehran. Russia's Ministry of Foreign Affairs reported that strikes in Tehran on 1 April damaged the St. Nicholas Orthodox Church and its auxiliary buildings. On 7 April, the Rafi'-Nia synagogue was fully destroyed by the IAF.
A study on the composition of the Late Pleistocene carnivoran and ungulate assemblage from the Fusong Xianren Cave (Jilin, China), including common representatives of the Mammuthus-Coelodonta fauna from northeastern China, is published by Liu et al. (2026). Rose et al. (2026) provide new information on the forelimb anatomy of Eurotamandua joresi, interpreted as supporting its affinities with Palaeanodonta. Evidence from micro-computed tomography of the skeleton of Eurotamandua joresi supporting its affinities with palaeanodonts is presented by Rose et al. (2026). Cabasés Bru et al. (2026) study the anatomy of virtual brain endocasts of Metacheiromys marshi, and report evidence that petrosal lobules (controlling eye movements during locomotion) and olfactory bulbs of the studied mammal were larger than in extant pangolins, as well as evidence of presence of well developed orbital gyrus which might be related to the use of a protrusile tongue in mammals specialized in myrmecophagy. Chatar et al. (2026) report evidence from the study of tribosphenic carnassial teeth of hyaenodonts and extant and extinct members of Carnivoramorpha indicative of a trade-off during the evolution of vast majority of the studied mammals resulting in prioritization of either shearing or crushing function of the studied teeth, with only minority of predatory mammals evolving optimized dual function of carnassial teeth.
Macrophages can internalize antigens through receptor-mediated phagocytosis. Macrophages have a wide variety of pattern recognition receptors (PRRs) that can recognize microbe-associated molecular patterns (MAMPs) from pathogens. Many PRRs, such as toll-like receptors (TLRs), scavenger receptors (SRs), C-type lectin receptors, among others, recognize pathogens for phagocytosis. Macrophages can also recognize pathogens for phagocytosis indirectly through opsonins, which are molecules that attach to pathogens and mark them for phagocytosis. Opsonins can cause a stronger adhesion between the macrophage and pathogen during phagocytosis, hence opsonins tend to enhance macrophages' phagocytic activity. Both complement proteins and antibodies can bind to antigens and opsonize them. Macrophages have complement receptor 1 (CR1) and 3 (CR3) that recognize pathogen-bound complement proteins C3b and iC3b, respectively, as well as fragment crystallizable γ receptors (FcγRs) that recognize the fragment crystallizable (Fc) region of antigen-bound immunoglobulin G (IgG) antibodies. When phagocytosing and digesting pathogens, macrophages go through a respiratory burst where more oxygen is consumed to supply the energy required for producing reactive oxygen species (ROS) and other antimicrobial molecules that digest the consumed pathogens.
The proteins in black mamba venom are of low molecular weight, low viscosity, and the venom's high activity in terms of hyaluronidases, which is also essential in facilitating dispersion of venom toxins throughout tissue (spreading the venom through the body) by catalyzing the hydrolysis of hyaluronan, a constituent of the extracellular matrix (ECM), hyaluronidase lowers the viscosity of hyaluronan, and Dendroaspin natriuretic peptide (DNP), a newly discovered component of mamba venom, is the most potent natriuretic peptide and is unique to the genus Dendroaspis, or mambas. It is a polypeptide analogous to the human atrial natriuretic peptide; it is responsible for causing diuresis through natriuresis and dilating the vessel bloodstream, which results in, among other effects, acceleration of venom distribution in the body of the victim, thereby increasing tissue permeability. These advanced and highly evolved physical and biological features combined with this species' large size, explosive aggression, and quickness make the black mamba a terrifying adversary. Neurological, respiratory, and cardiovascular symptoms rapidly begin to manifest, usually within less than ten minutes. Common symptoms are rapid onset of dizziness, drowsiness, headache, coughing or difficulty breathing, convulsions, and an erratic heartbeat.
The idea of "no independence before majority rule", commonly abbreviated to "NIBMAR", gained considerable ground in British political circles. When Huggins (who had been recently ennobled as Lord Malvern) asked Britain to make the Federation a dominion in 1956, he was rebuffed. The opposition Dominion Party responded by repeatedly calling for a Federal unilateral declaration of independence (UDI) over the next few years. Following Lord Malvern's retirement in late 1956, his successor Sir Roy Welensky pondered such a move on at least three occasions. Attempting to advance the case for Southern Rhodesian independence, particularly in the event of Federal dissolution, the Southern Rhodesian Prime Minister Sir Edgar Whitehead brokered the 1961 constitution with Britain, which he thought would remove all British powers of reservation over Southern Rhodesian bills and acts, and put the country on the brink of full sovereignty. Despite its containing no independence guarantees, Whitehead, Welensky and other proponents of this constitution presented it to the Southern Rhodesian electorate as the "independence constitution" under which Southern Rhodesia would become a dominion on a par with Australia, Canada and New Zealand if the Federation dissolved. White dissenters included Ian Smith, MP for Gwanda and Chief Whip for the governing United Federal Party (UFP) in the Federal Assembly, who took exception to the constitution's omission of an explicit promise of Southern Rhodesian independence in the event of Federal dissolution, and ultimately resigned his post in protest.
Sources: en.wikipedia.org
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine–glutamate–aspartate–glycine, also written AEDG. It was developed in Russian gerontology research and is studied for proposed effects on telomerase, melatonin regulation, and neuroendocrine function. It is not an approved pharmaceutical in the United States or the European Union.
No. Epithalamin is a peptide-rich extract prepared from bovine pineal glands, while epitalon is a short synthetic peptide designed as a defined analogue of it. The synthetic version was intended to provide a reproducible molecule with some of the same proposed biological activity.
Telomere elongation and telomerase activation have been reported in cultured human somatic cells, but evidence from living human subjects is limited and has not been independently confirmed at scale. Reported findings come largely from small studies with differing designs, so the question remains open rather than settled.
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.