The short version of AEDG fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-01 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.
The peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
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 | 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 |
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
Discussions in the literature often conflate three distinct entities: the pineal extract epithalamin, the isolated tetrapeptide AEDG, and commercial preparations sold under similar names. Reviews citing older Russian-language studies sometimes omit detail on purity, route of administration and control groups, which makes cross-study comparison difficult. Researchers working with the compound generally note the need for independent replication, standardized enzyme assays, and clearer reporting of peptide identity. These caveats are relevant when weighing claims that appear in secondary sources rather than in primary reports.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
Contemporary border control policies are complex and address a variety of distinct phenomena depending on the circumstances and political priorities of the state(s) implementing them. Consequently, several aspects of border control vary in nature and importance from region to region.
N-terminus Also amine terminus and amino terminus. The end of a linear chain of amino acids (i.e. a peptide) that is terminated by the free amine group (–NH2) of the first amino acid added to the chain during translation. This amino acid is said to be N-terminal. By convention, sequences, domains, active sites, or any other structure positioned nearer to the N-terminus of the polypeptide or the folded protein it forms relative to others are described as upstream. Contrast C-terminus.
In Type 1 diabetics hyperglycemia due to the dawn phenomenon can persist despite adequate insulin compensation overnight, while in Type 2 diabetics the dawn phenomenon has been shown to be resistant to treatment with both oral medications and diet modifications. An "extended" dawn phenomenon has also been observed in which the abnormal increase in blood glucose levels continues after breakfast. This prolonged duration is thought to be caused by the compounding effects of absorbing and metabolizing breakfast carbohydrates during this period. Both the dawn phenomenon and its extended period have been shown to be significantly more difficult to control when a patient's HbA1c is greater than 7%.
In Tunisia, the Ministry of Higher Education and Scientific Research controls public universities and guarantees admission to students who earn a Tunisian Baccalaureate. Using a state website, the students make a wish list of the universities they want to attend, with the highest-ranking students getting priority choices. Universities rank students according to the results of their baccalaureate.
An exception to this wide distribution is a group of unique cofactors that evolved in methanogens, which are restricted to this group of archaea. Although enzyme catalyzed industrial processes are highly efficient, some of the enzymes are dependent on nicotinamide cofactors (NADH/NAD+, NADP/NAPH). Due to the high price of such cofactors, these processes would not be economically competitive. Recently, some synthetic organic compounds were identified as economically promising biomimetic counterparts of natural cofactors.
Sources: en.wikipedia.org
One can also be exposed to these hazardous drugs through injection by needle sticks. Research conducted in this area has established that occupational exposure occurs by examining evidence in multiple urine samples from health care workers.
=== Inhibitor of mitochondrial permeability transition pore === It has also been shown that the compound inhibits mitochondrial permeability transition pore (MPTP) by inhibiting the activity of the pore regulator, cyclophilin D (CyP-D). CyP-D is a peptidyl-prolyl cis-trans isomerase or protein that causes a proline residue in a peptide to switch from its trans isomer to its cis isomer. Studies have been done using the Calcium retention capacity (CRC) assay on mouse liver mitochondria in order to measure antamanide's effect on the permeability transition pore. The data from this experiment showed that antamanide inhibits pore opening like the known inhibitors CsA and Ubiquinone 0. It has been found that altering the 6 and 9 positions in the cyclic peptide ring disables the inhibitory effect on the pore by the drug. A study has also been to determine whether the antamanide also inhibits the apoptosis (programmed cell death) of human cervical carcinoma cells caused by the permeability transition pore. The results showed an inhibitory response. Studying for inhibitors of MPTP is important because MPTP induction is connected to many diseases, such as muscular dystrophies (a disease that weakens the musculoskeletal system), hepatotoxicity (chemical caused liver damage), and ischemic injury of the kidneys (injury causing restriction of blood supply to the kidneys).
These procedures aim to inject bio-compatible material (perianal injectable bulking agents, also termed sphincter bulking agents or biomaterial injectables) into the walls of the anal canal, in order to bulk out these tissues. This may bring the walls of the anal canal into tighter contact, raising the resting pressure, creating more of a barrier to the loss of stool, and thereby reducing fecal incontinence. This procedure has many advantages over more invasive surgery, since there are rarely any serious complications.
The length of the filaments varies across the body. On the type specimen, they are shortest just in front of the eyes, with a length of 13 mm (0.51 in). Going further along the body, the filaments rapidly increase in length until reaching lengths of 35 mm (1.4 in) over the shoulder blades. The length remains uniform over the back, until beyond the hips, when the filaments lengthen again and reach their maximum length midway down the tail at 40 mm (1.6 in). The filaments on the underside of the tail are shorter overall and decrease in length more rapidly than those on the dorsal surface. By the 25th tail vertebrae, the filaments on the underside reach a length of only 35 mm (1.4 in). The longest feathers present on the forearm measured 14 mm (0.55 in). Though the feathers are too dense to isolate a single structure for examination, several studies have suggested the presence of two distinct filament types (thick and thin) interspersed with each other. The thick filaments tend to appear 'stiffer' than thin filaments, and the thin filaments tend to lie parallel to each other but at angles to nearby thick filaments. These properties suggest that the individual feathers consisted of a central quill (rachis) with thinner barbs branching off from it, similar to but more primitive in structure than modern bird feathers. Overall, the filaments most closely resemble the "plumules" or down-like feathers of some modern birds, with a thick central quill and long, thin barbs. The same structures are seen in other fossils from the Yixian Formation, including Confuciusornis.
Sources: en.wikipedia.org
Isotope masses from: Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001 Half-life, spin, and isomer data selected from the following sources. Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001 National Nuclear Data Center. "NuDat 3.0 database". Brookhaven National Laboratory. Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.
Iran hit Stryker, a US-based medical supply company with a cyberattack. On 12 March, UNICEF reported that 300 children had been killed, thousands injured, hundreds of thousands displaced, and millions unable to attend schools due to the war. Iranian deputy intelligence minister Akbar Ghaffari was killed in an airstrike. An Iranian attack set two tankers on fire off the Iraqi coast, killing one person. The historical Safavid-era building of Rashk-e Jenan, was destroyed by US-Israeli strikes. Other buildings damaged included the Chehel Sotoun pavilion, Rakib Khaneh Mansion, Timurid Hall, Ashraf Hall and the Ali Qapu palace. Many affected buildings and monuments were legally protected by the Blue Shield International, which called damaging them a war crime. French soldiers were injured in a drone strike at a base in Iraqi Kurdistan. French president Emmanuel Macron announced on 13 March that a soldier was killed in the attack. On 13 March, to alleviate the economic costs of the war, the US temporarily lifted restrictions on the sale of Russian oil. Iran announced a coordinated offensive by its navy, army, and Hezbollah against Israel and US bases. Israel reported that 58 people have been hospitalized due to injuries following a missile strike. Kuwait authorities stated that defense equipment and the country's main airport were attacked, and power lines gone out of service. Missiles entered Turkish air space and were intercepted, with explosions heard near Adana. Israel struck IRGC checkpoints after receiving tip-offs by informants on the ground.
In July 2023, the paper announced it will reduce its print schedule to three days a week: Tuesday, Thursday and Saturday. Also, the newspaper will transition from carrier to postal delivery. In September 2024, Napa Valley Publishing, which publishes the paper, was sold by Lee Enterprises to Hoffmann Media Group.
The term poison is often used colloquially to describe any harmful substance, especially corrosive substances, carcinogens, mutagens, teratogens, and harmful pollutants. In everyday language, it is sometimes used to exaggerate the perceived danger of certain chemicals. The 16th-century physician Paracelsus (1493–1541), regarded as the father of toxicology, famously stated: "Everything is poison, there is poison in everything. Only the dose makes a thing not a poison." (See: LD50). The term is also used in a figurative sense—for example: "His brother's presence poisoned the atmosphere at the party." In contrast, legal definitions of "poison" tend to be narrower. Some substances that are not legally required to carry a "poison" label may still cause medical conditions associated with poisoning. Some poisons are also classified as toxins, which are toxic substances produced by living organisms. Examples include bacterial proteins responsible for conditions such as tetanus and botulism. While a distinction exists between "poison" and "toxin", the terms are often used interchangeably, even in scientific contexts. Related adjectives include toxic and poisonous, which are generally considered synonymous. Poisonous substances introduced into the body by sting or bite are known as venoms. In everyday usage, a poisonous organism is one that causes harm when ingested or touched, while a venomous organism uses venom actively to incapacitate prey or deter predators. Although rare, some organisms may be both poisonous and venomous.
Moscow has an extensive tram system, which opened in 1899. The newest line was constructed in 1984. Daily tram usage by Muscovites is low, making up approximately 5% of trips, because vital connections in the network have been phased out. Nevertheless, trams remain important in some districts as feeders to metro stations. Trams also provide important cross-links between metro lines—for example, between the Universitet station on the Sokolnicheskaya Line (#1 red line) and the Profsoyuznaya station on the Kaluzhsko-Rizhskaya Line (#6 orange line), and similarly between the Voykovskaya metro station and the Strogino metro station.
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 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.