If you have been reading about Telomerase induction and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-02-04. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Epitalon appears in the literature primarily through a small number of research groups, most of them associated with the St. Petersburg Institute of Bioregulation and Gerontology. Publications describe cell culture experiments, animal studies, and a limited number of small human studies. Independent replication outside this network is sparse. As a result, reviews of the topic usually separate descriptive reports of observed effects from the question of whether those effects generalize, and they note the difficulty of comparing studies that use different preparations and endpoints.
Analytical characterization of epitalon relies on standard peptide methods. Reverse-phase high-performance liquid chromatography is used to assess purity, and mass spectrometry confirms identity by checking the observed mass against the expected value near 390 daltons. Amino acid analysis can verify composition. Because the peptide is short and hydrophilic, it elutes early on many reverse-phase columns, so method development often requires ion-pairing reagents to achieve adequate retention and resolution from related impurities.
Storage and handling follow conventional peptide practice. Lyophilized epitalon is typically kept refrigerated or frozen, protected from moisture and light, and allowed to equilibrate to room temperature before opening to avoid condensation. Once dissolved, aqueous solutions are usually stored cold and used within a short period, since dilute peptide solutions can support microbial growth and may slowly degrade. The absence of cysteine and methionine reduces, but does not eliminate, oxidation concerns during long-term storage.
| 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 peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
Identity confirmation uses mass spectrometry, usually electrospray ionisation in positive mode or matrix-assisted laser desorption. The protonated free peptide produces a signal near three hundred and ninety-one daltons, while salt adducts shift that value slightly. Tandem mass spectrometry or amino acid analysis supplies sequence-level confirmation, which a single mass measurement cannot. Peptides containing aspartate can cyclise into succinimide intermediates that hydrolyse to isoaspartate isomers of identical mass. Because those isomers are difficult to separate chromatographically, identity and purity results carry more weight when interpreted together.
Storage practice centres on limiting moisture, oxygen, and repeated temperature cycling. Freeze-dried powder is generally held desiccated at minus twenty degrees Celsius or colder and protected from light. Reconstituted solutions are markedly less stable, and the aspartate-glycine junction is prone to succinimide formation at neutral to mildly alkaline pH. Portioning material into single-use aliquots reduces degradation compared with repeated freeze-thaw cycles. Stability data specific to this tetrapeptide remain scarce, so most handling guidance is extrapolated from general peptide chemistry rather than measured directly.
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.
=== Biological detection === The discovery of radiative recombination in aluminum gallium nitride (AlGaN) alloys by U.S. Army Research Laboratory (ARL) led to the conceptualization of UV light-emitting diodes (LEDs) to be incorporated in light-induced fluorescence sensors used for biological agent detection. In 2004, the Edgewood Chemical Biological Center (ECBC) initiated the effort to create a biological detector named TAC-BIO. The program capitalized on semiconductor UV optical sources (SUVOS) developed by the Defense Advanced Research Projects Agency (DARPA). UV-induced fluorescence is one of the most robust techniques used for rapid real-time detection of biological aerosols. The first UV sensors were lasers lacking in-field-use practicality. In order to address this, DARPA incorporated SUVOS technology to create a low-cost, small, lightweight, low-power device. The TAC-BIO detector's response time was one minute from when it sensed a biological agent. It was also demonstrated that the detector could be operated unattended indoors and outdoors for weeks at a time. Aerosolized biological particles fluoresce and scatter light under a UV light beam. Observed fluorescence is dependent on the applied wavelength and the biochemical fluorophores within the biological agent. UV induced fluorescence offers a rapid, accurate, efficient and logistically practical way for biological agent detection.
==== Companion of the Order of St Michael and St George (CMG) ==== Jennifer Elizabeth Anderson, Director, Consular and Crisis, Foreign, Commonwealth and Development Office. For services to British Foreign Policy and to British Nationals Overseas. Zamir Nicholas Catasaras, Director General for Russia and Ukraine, Cabinet Office. For services to British Foreign Policy. Roger James Coventry, Criminal Justice Adviser. For services to Justice and Stability overseas. Colin Mark Evans, Director General, Foreign, Commonwealth and Development Office. For services to National Security. Dr Fiona Hill, Senior Fellow, Brookings Institution, Washington D.C., United States of America. For services to International Relations. Dr Rurik Miles Marsden, , Development Director, British Embassy Yangon, Myanmar. For services to International Development. Susanna Mary Davies Moorehead, lately Chair, Development Assistance Committee, The Organisation for Economic Co-operation and Development (OECD). For services to International Development and Diplomacy. Jane Anne Nelson, Director, Corporate Responsibility Initiative, Kennedy School of Government, Harvard University, United States of America. For services to Business and to Sustainability. Dr Sara Pantuliano, Chief Executive, ODI. For services to Peacebuilding, to Humanitarian Assistance and to International Development. Simon Penny, lately H.M. Trade Commissioner for the Middle East and Pakistan and H.M. Consul General to Dubai and the Northern Emirates. For services to International Trade and Investment.
=== United States === There are currently three major certification agencies in the United States of America for clinical laboratory scientists. They are the American Association of Bioanalysts (AAB), the American Medical Technologists (AMT), and the American Society for Clinical Pathology (ASCP). Clinical Laboratory Science programs have the option to be accredited by the National Accrediting Agency for Clinical Laboratory Science (NAACLS). NAACLS accreditation allows students to sit for their certification at the completion of their program in addition to being a stamp of program quality. All the three national accrediting agencies will certify scientists in the clinical laboratory as generalist (chemistry, hematology, immunology, immunohematology/blood bank, and microbiology). The American Association of Bioanalysts and the American Medical Technologists certifications continue to use the traditional designation medical technologist (MT), while the American Society for Clinical Pathology has adopted the designation of medical laboratory scientist (MLS). Regardless of terminology, these highly qualified individuals serve as scientists in the clinical laboratory. Two other organizations have previously provided proficiency examinations to clinical laboratory scientists: the US Department of Health and Human Services, and the National Credentialing Agency for Laboratory Personnel (NCA). The NCA was absorbed by the American Society for Clinical Pathology in 2009 and promptly dissolved.
=== General SPPS procedure === Stepwise SPPS proceeds from the C-terminal amino acid residue of the target peptide chain covalently attached to the resin support. Each amino acid to be coupled to the N-terminus of the resin bound nascent peptide chain must be protected on its alpha amino group using protecting groups such as Boc (acid-labile) or Fmoc (base-labile), depending on the protection strategy used (see below). The general SPPS procedure is one of repeated cycles of alternate N-terminal deprotection and peptide bond-forming 'coupling' reactions. The resin is washed with organic solvent between each chemical reaction step. Reactions in SPPS are conducted as follows:
episclera stroma lamina fusca endothelium The sclera is opaque due to the irregularity of the Type I collagen fibers, as opposed to the near-uniform thickness and parallel arrangement of the corneal collagen. Moreover, the cornea bears more mucopolysaccharide (a carbohydrate that has among its repeating units a nitrogenous sugar, hexosamine) to embed the fibrils. The cornea, unlike the sclera, has six layers. The middle (third in number; provided the first layer being the anterior and outermost and the sixth layer being the posterior and the inner most), thickest layer is also called the stroma. The sclera, like the cornea, contains a basal endothelium, above which there is the lamina fusca, containing a high count of pigment cells. Sometimes, very small gray-blue spots can appear on the sclera, a harmless condition called scleral melanocytosis.
Sources: en.wikipedia.org
== Treatment == There is no clearly defined cure for necrobiosis. NLD may be treated with PUVA therapyPhotodynamic therapy and improved therapeutic control. Although some techniques can be used to diminish the signs of necrobiosis, such as low-dose aspirin orally, a steroid cream or injection into the affected area, this process may be effective for only a small percentage of those treated. First medications applied are topical corticosteroids, but these may not be effective for all patients. Compression therapy and proper wound care are essential for treatment. Anti-inflammatory, immunosuppressive, and immunomodulatory agents like chloroquine, dapsone, and oral calcineurin inhibitors. These target the cyclic and damaging immune response occurring in NL. Since TNF is essential to granuloma formation, antibodies that bind to TNF-α to prevent its action help reduce inflammation, pain, and the growth of ulcers. A study found a 70% complete reduction of NL when using TNF-α inhibitors. Hyperbaric oxygen can also be used to increase the amount of oxygen circulation and promote wound healing.
==== Food ==== In 2018, world production of poppy seeds for consumption was 76,240 tonnes, led by Turkey with 35% of the world total (table). Poppy seed production and trade are susceptible to fluctuations mainly due to unstable yields. The performance of most genotypes of Papaver somniferum is very susceptible to environmental changes. This behaviour led to a stagnation of the poppy seed market value between 2008 and 2009 as a consequence of high stock levels, bad weather and poor quality. The world leading importer of poppy seed is India (16 000 tonnes), followed by Russia, Poland and Germany. Poppy seed oil remains a niche product due to the lower yield compared to conventional oil crops.
== History == C17α esters of 11-deoxycortisol were unexpectedly found to possess antiandrogenic activity. Clascoterone, also known as cortexolone 17α-propionate, was selected for development based on its optimal drug profile. The medication was approved by the US Food and Drug Administration (FDA) for the treatment of acne in August 2020. The FDA approved clascoterone based on evidence from two clinical trials (Trial 1/NCT02608450 and Trial 2/NCT02608476) of 1,440 participants 9 to 58 years of age with acne vulgaris. The trials were conducted at 99 sites in the United States, Poland, Romania, Bulgaria, Ukraine, Georgia, and Serbia. Participants applied clascoterone or vehicle (placebo) cream twice daily for 12 weeks. Neither the participants nor the health care providers knew which treatment was being given until after the trial was completed. The benefit of clascoterone in comparison to placebo was assessed after 12 weeks of treatment using the Investigator's Global Assessment (IGA) score that measures the severity of disease (on a scale from 0 to 4) and a decrease in the number of acne lesions.
Psychological Depression Suicidal ideation Nightmares Apathy, anhedonia, or dysphoria Anxiety, especially social anxiety Decreased alertness, awareness, and wakefulness Impaired attention and concentration Fatigue Malaise Drowsiness Restlessness Cognitive and memory impairment Derealization or depersonalization, as well as mild psychosis Sexual dysfunction including impaired libido, desire, and drive Physiological Dizziness, lightheadedness, or vertigo Miosis or pupil constriction Xerostomia or dry mouth Gastrointestinal disturbances such as diarrhea or constipation Headache or migraine Myalgia or muscle aches, arthralgia or joint pain, or paresthesia ("pins and needles") Restless legs syndrome (RLS) Parkinsonian symptoms such as muscle tremors, rigidity, hypokinesia, or balance or postural instability Akathisia, ataxia, dyskinesia, as well as even tardive dyskinesia or dystonia Bell's palsy or facial paralysis Sexual dysfunction Hyperprolactinemia Gynecomastia in males, amenorrhoea or absence of menstrual cycles in females Bradycardia Hypotension Orthostatic hypotension Hepatitis, hepatotoxicity, or liver dysfunction or damage Pancreatitis Warm autoimmune hemolytic anemia or deficiency in red blood cells (RBCs) Myelotoxicity or bone marrow suppression, potentially leading to thrombocytopenia, blood platelet deficiency, leukopenia, or white blood cell deficiency Hypersensitivity (e.g., lupus erythematosus, myocarditis, or pericarditis) Lichenoid reactions (e.g., skin lesions or rashes) Pallor
Sources: en.wikipedia.org
One hundred desks are arranged in the chamber in a semicircular pattern and are divided by a wide central aisle. The Democratic Party traditionally sits to the presiding officer's right, and the Republican Party traditionally sits to the presiding officer's left, regardless of which party has a majority of seats. Each senator chooses a desk based on seniority within the party. By custom, the leader of each party sits in the front row along the center aisle. Forty-eight of the desks date back to 1819, when the Senate chamber was reconstructed after the original contents were destroyed in the 1812 Burning of Washington. Further desks of similar design were added as new states entered the Union. It is a tradition that each senator who uses a desk inscribes their name on the inside of the desk's drawer with a pen.
This reaction is relatively slow, so even after significant exposure, the 239Pu is still mixed with a great deal of 238U (and possibly other isotopes of uranium), oxygen, other components of the original material, and fission products. Only if the fuel has been exposed for a few days in the reactor, can the 239Pu be chemically separated from the rest of the material to yield high-purity 239Pu metal. 239Pu has a higher probability for fission than 235U and a larger number of neutrons produced per fission event, so it has a smaller critical mass. Pure 239Pu also has a reasonably low rate of neutron emission due to spontaneous fission (10 fission/s·kg), making it feasible to assemble a mass that is highly supercritical before a detonation chain reaction begins. In practice, however, reactor-bred plutonium will invariably contain a certain amount of 240Pu due to the tendency of 239Pu to absorb an additional neutron during production. 240Pu has a high rate of spontaneous fission events (415,000 fission/s-kg), making it an undesirable contaminant. As a result, plutonium containing a significant fraction of 240Pu is not well-suited to use in nuclear weapons; it emits neutron radiation, making handling more difficult, and its presence can lead to a "fizzle" in which a small explosion occurs, destroying the weapon but not causing fission of a significant fraction of the fuel. It is because of this limitation that plutonium-based weapons must be implosion-type, rather than gun-type.
27 September Physicists report studies, for the first time, supporting the notion that antimatter particles behave in a similar way as normal matter in a gravitational field. Astronomers report studies suggesting that the rings of Saturn may have resulted from the collision of two moons "a few hundred million years ago". A breakthrough in desalination is achieved by engineers, using a solar-powered device to create freshwater at lower cost than tap water.
=== Cellulose nanocrystals === Cellulose nanocrystals (CNC) are rod like particles formed by the acid hydrolysis of native cellulose fibers, most commonly using sulfuric or hydrochloric acid. Disordered sections of native cellulose are hydrolysed and after careful timing, the remaining crystalline sections can be retrieved from the acid solution by centrifugation and dialysis against water. Their final dimensions depend on the cellulose source, its history, the hydrolysis conditions and the purification procedures. CNCs are commercialised by various companies that use different sources and processes, leading to a range of available products.
== Chemistry of experiment == In 1957 Miller published research describing the chemical processes occurring inside his experiment. Hydrogen cyanide (HCN) and aldehydes (e.g., formaldehyde) were demonstrated to form as intermediates early on in the experiment due to the electric discharge. This agrees with current understanding of atmospheric chemistry, as HCN can generally be produced from reactive radical species in the atmosphere that arise when CH4 and nitrogen break apart under ultraviolet (UV) light. Similarly, aldehydes can be generated in the atmosphere from radicals resulting from CH4 and H2O decomposition and other intermediates like methanol. Several energy sources in planetary atmospheres can induce these dissociation reactions and subsequent hydrogen cyanide or aldehyde formation, including lightning, ultraviolet light, and galactic cosmic rays. For example, here is a set photochemical reactions of species in the Miller–Urey atmosphere that can result in formaldehyde:
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.
Identity is normally confirmed by mass spectrometry, which checks the measured mass against the expected value near 390 daltons. Reverse-phase high-performance liquid chromatography is used alongside it to assess purity. Amino acid analysis can provide additional composition data.