AEDG peptide comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-07-19. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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 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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Synthetic tetrapeptide, four residues |
| Nominal mass | Approximately 390 Da | Free peptide; salt forms differ |
| Appearance | White to off-white powder | Commonly supplied lyophilised |
| Solubility class | Freely soluble in water | Also dissolves in aqueous buffer |
| Typical storage | −20 °C, desiccated | Cold packs used during transport |
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
Reported biological findings come mainly from cell culture and rodent experiments. Those studies describe changes in telomerase catalytic subunit expression, melatonin rhythm amplitude, and antioxidant enzyme activity after peptide exposure. Human data are sparse and consist of small trials with limited blinding and inconsistent endpoints. The proposed mechanisms remain hypotheses rather than established facts, and there is no consensus on whether effects observed in animals carry over to people. Independent replication outside the original research groups is limited, which is a recognised gap in the published literature.
The parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
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.
After these events, in 1989 Assembly of Socialist Republic of Serbia voted for constitution amendments that revoked high autonomy for provinces of Vojvodina and Kosovo. After Slovenian authorities forbid a group of Serbs supporting his politics to gather in Ljubljana, Milosević started a trade war with Socialist Republic of Slovenia in late 1989. This Serbian–Slovenian conflict culminated in January 1990 on 14th Congress of the League of Communists of Yugoslavia when Slovenians left the meeting followed by Croatian delegates. After 1990, the state was known simply as Republic of Serbia (Serbo-Croatian: Република Србија / Republika Srbija), and in December of the same year, Slobodan Milošević was elected as first President of the Republic. In 1992, when the Federal Republic of Yugoslavia was formed, Serbia became one of its two constituent republics. In 2003, this state union was re-formed into Serbia and Montenegro, and in 2006, Serbia became an independent republic after Montenegro separated.
=== Encoding === Methionine is one of only two amino acids encoded by a single codon (AUG) in the standard genetic code (tryptophan, encoded by UGG, is the other). In reflection to the evolutionary origin of its codon, the other AUN codons encode isoleucine, which is also a hydrophobic amino acid. In the mitochondrial genome of several organisms, including metazoa and yeast, the codon AUA also encodes for methionine. In the standard genetic code AUA codes for isoleucine and the respective tRNA (ileX in Escherichia coli) uses the unusual base lysidine (bacteria) or agmatidine (archaea) to discriminate against AUG. The methionine codon AUG is also the most common start codon. A "Start" codon is message for a ribosome that signals the initiation of protein translation from mRNA when the AUG codon is in a Kozak consensus sequence. As a consequence, methionine is often incorporated into the N-terminal position of proteins in eukaryotes and archaea during translation, although it can be removed by post-translational modification. In bacteria, the derivative N-formylmethionine is used as the initial amino acid.
== Exceptions == Peyote and ayahuasca, which contain mescaline and dimethyltryptamine (DMT), respectively, are exempt in certain spiritual or religious settings. A variety of notable psychedelics, including 4-AcO-DMT (psilacetin), 4-HO-MET, dipropyltryptamine (DPT), 5-MeO-MiPT, 5-MeO-AMT, 2C-EF, 2C-B-FLY, Bromo-DragonFLY, methallylescaline (MAL), ALD-52 (1A-LSD), 1P-LSD, ETH-LAD, and LSZ, among many others, are not explicitly controlled substances nor implicitly controlled isomers of scheduled psychedelics in the United States. However, these psychedelics and others could nonetheless be considered controlled substances if intended for human consumption under the Federal Analogue Act.
==== Symmetry-breaking and chiral amplification of ribose aminooxazoline (RAO) ==== The chirality of the ribose sugar in RAO is conserved in its transformation into ribonucleotides, so obtaining RAO in its enantiopure form could lead to the formation of homochiral RNA. Experimental work shows that enantiopure RAO could be achieved via the interaction of a racemic mixture of RAO and a spin-polarized magnetic surface, such as the surface of the prebiotically abundant mineral magnetite, due to the chirality-induced spin selectivity (CISS) effect and the unique conglomerate crystallization properties of RAO (i.e. its tendency to crystallize as enantiopure crystals). In combination, these two processes can provide symmetry-breaking and amplification mechanisms for the isolation of enantiopure RAO from an initial racemic starting mixture. The CISS effect is a physical phenomena that describes the strong interaction of an electron's linear momentum and spin with a chiral molecule's electrostatic potential, allowing chiral molecules to preferentially interact with electrons of a particular spin due to lower energy spin-exchange interactions. This process explains the observation that an enantiopure layer of chiral molecules can selectively filter for electrons of a particular spin. In reverse, the CISS effect provides a symmetry breaking mechanism for RAO: spin-polarized electrons on a magnetic surface (i.e. electrons that have a net spin alignment in a particular direction) preferentially interact with one enantiomer of RAO, seeding its crystallization.
Sources: en.wikipedia.org
In general, in prokaryotes the lifetime of mRNA is much shorter than in eukaryotes. Prokaryotes degrade messages by using a combination of ribonucleases, including endonucleases, 3' exonucleases, and 5' exonucleases. In some instances, small RNA molecules (sRNA) tens to hundreds of nucleotides long can stimulate the degradation of specific mRNAs by base-pairing with complementary sequences and facilitating ribonuclease cleavage by RNase III. It was recently shown that bacteria also have a sort of 5' cap consisting of a triphosphate on the 5' end. Removal of two of the phosphates leaves a 5' monophosphate, causing the message to be destroyed by the exonuclease RNase J, which degrades 5' to 3'.
As the real world had shown the importance of sulfate aerosol concentrations to the global climate, research into the subject accelerated. Formation of the aerosols and their effects on the atmosphere can be studied in the lab, with methods like ion-chromatography and mass spectrometry Samples of actual particles can be recovered from the stratosphere using balloons or aircraft, and remote satellites were also used for observation. This data is fed into the climate models, as the necessity of accounting for aerosol cooling to truly understand the rate and evolution of warming had long been apparent, with the IPCC Second Assessment Report being the first to include an estimate of their impact on climate, and every major model able to simulate them by the time IPCC Fourth Assessment Report was published in 2007. Many scientists also see the other side of this research, which is learning how to cause the same effect artificially. While discussed around the 1990s, if not earlier, stratospheric aerosol injection as a solar geoengineering method is best associated with Paul Crutzen's detailed 2006 proposal.
== Alternative remedies == The medieval Bald's Leechbook recommended treating chilblains with a mixture of eggs, wine, and fennel root. A modern-day home remedy is to put garlic on the chilblains. Other herbal remedies supposed to be vasodilating, rubifacient, and warming, have been recommended.
The forest cobra (Naja melanoleuca) is the largest true cobra of the genus Naja and is a bad-tempered and irritable snake when cornered or molested as handled in captivity. According to Brown (1973) this species has a murine IP LD50 value of 0.324 mg/kg, while the IV LD50 value is 0.6 mg/kg. Ernst and Zug et al. 1996 list a value of 0.225 mg/kg SC. The venom yield per bite ranges drastically among sources: a maximal dose of 500 mg has been recorded while another venom yield project on two individuals obtained an average dose of 571 mg (dry venom) with a maximum of 1102 mg from 59 times of milking. The forest cobra is one of the least frequent causes of snake bite among the African cobras. This is largely due to its forest-dwelling habits. It is the largest of the Naja cobras and the venom is considered highly toxic. If the snake becomes cornered or is agitated, it can quickly attack the aggressor, and if a large amount of venom is injected, a rapidly fatal outcome is possible. Clinical experience with forest cobras has been very sparse, and few recorded bites have been documented. However, in 2008, around the area of Friguiagbé in Guinea, there were 375 bites attributed to the forest cobra and of those 79 were fatal. Most of the fatal bites were patients who received no medical treatment. Deaths from respiratory failure have been reported, but most victims will survive if prompt administration of antivenom is undertaken as soon as clinical signs of envenomation have been noted.
=== Climate === Tyne and Wear either has or closely borders two official Met Office stations, neither located in one of the major urban centres. The locations for those are in Tynemouth, where the river Tyne meets the North Sea, east of Newcastle; and inland at Durham, around 20 kilometres (12 mi) south-west of Sunderland. There are some clear differences between the two stations' temperature and precipitation patterns, even though both have a cool-summer and mild-winter oceanic climate.
Sources: en.wikipedia.org
The main function of trypanothione synthase is to use the free energy generated from ATP hydrolysis to conjugate glutathione and spermidine to form the intermediate of glutathionylspermidine and then the final product of trypanothione. It also catalyzes the reverse reaction as well, albeit at a much lower rate. Under conditions found to be the optimum for both the forward and backwards reactions, trypanothione synthase from trypanosoma cruzi was found to have an amidase activity that was only about 1% of the forwards synthetase activity. This low activity can be explained by the blocking of the catalytic Cys in the amidase active site in order for the protein to properly fold. In parasitic kinetoplastids trypanothione synthase activity is key to survival. Due to the need for trypanothione in order to defend against oxidative stresses, and maintain thiol and ribonucleotide metabolism. It was observed that induced knockout of trypanothione synthase through RNA interference caused a reduced growth rate of twofold among trypanosoma brucei due to the immediate disruption of flux through thiol redox. In other similar experiments which observed cell death after knocking out trypanothione synthase, it was shown that after two hours of being exposed to hydrogen peroxide in order to mimic the oxidant attack of phagocytes, the cells which did not contain working trypanothione synthase had a much higher death rate than wild type T. brucei.
== Philosophy, origins, architects == The international drug conventions occurred within the newly formed United Nations, as the UN assumed the duties of the retired League of Nations after WWII. The preamble to the Single Convention establishes the overarching concern of the drug treaties as "the health and welfare of mankind". It recognizes "narcotic drugs" as "indispensable for the relief of pain and suffering" and that they "must be made [available] for such purposes". It also recognizes addiction to narcotics as "a serious evil for the individual and is fraught with social and economic danger to mankind" and that there is a duty of nations to "prevent and combat this evil". The conventions offer a degree of interpretative flexibility within a framework of control through prohibition. Controlled substances used for medical and scientific purposes are regulated, while other uses are prohibited; "each of the treaties encourages – and often requires – that member countries put in place strong domestic penal provisions." A report by the Library of Parliament for the government of Canada on the history of the conventions identifies four themes as critical influences on the nature of the treaties: prohibition, United States involvement, external influences, and the outsized impact of certain powerful individuals. Prohibition of illicit use, "as opposed to regulation", has been the central philosophy. The US has been "the key player in most multilateral negotiations" and the prohibitionist approach "derives largely from U.S.
Heavy metal contamination of land by industry. These can then be transported into water bodies and be taken up by living organisms such as animals and plants. PAHs (Polycyclic Aromatic Hydrocarbon) in large bodies of water contaminated by oil spills or leaks. Many of the PAHs are carcinogens and are extremely toxic. They are regulated by concentration (ppb) using environmental chemistry and chromatography laboratory testing. Nutrients leaching from agricultural land into water courses, which can lead to algal blooms and eutrophication. Urban runoff of pollutants washing off impervious surfaces (roads, parking lots, and rooftops) during rain storms. Typical pollutants include gasoline, motor oil and other hydrocarbon compounds, metals, nutrients and sediment (soil). Organometallic compounds. Radiochemicals.
The absorption rate constant Ka is a value used in pharmacokinetics to describe the rate at which a drug enters into the system. It is expressed in units of time−1. The Ka is related to the absorption half-life (t1/2a) per the following equation: Ka = ln(2) / t1/2a. Ka values can typically only be found in research articles. This is in contrast to parameters like bioavailability and elimination half-life, which can often be found in drug and pharmacology handbooks.
Suvorexant appeared to be similarly effective at 4 weeks to lemborexant (SMD 0.36, 95% CI 0.08 to 0.63) and daridorexant (SMD 0.23, 95% CI –0.01 to 0.48), whereas benzodiazepines and Z-drugs generally showed larger effect sizes (e.g., SMDs of 0.45 to 0.83) and antihistamines (e.g., doxepin, doxylamine, trimipramine) showed more similar efficacy (SMDs of 0.30 to 0.55). Orexin receptor antagonists like suvorexant increase total sleep time predominantly by increasing rapid eye movement sleep (REM) sleep, whereas they have no effect on or even decrease non-rapid eye movement (NREM) sleep. This is in contrast to most other hypnotics, which either do not affect REM sleep or decrease it. The implications of these differences are not fully clear. Unlike certain other hypnotics like benzodiazepines and Z-drugs, orexin receptor antagonists do not disrupt sleep architecture, and this might provide more restful sleep. It is unclear if suvorexant is safe among people with a history of substance addiction or alcoholism, as these individuals were excluded from clinical trials of suvorexant. A Cochrane review found suvorexant to be effective in the short-term treatment of sleep disturbances in people with dementia with few adverse effects. It is unknown if suvorexant is effective and safe for treatment of sleep problems in children and adolescents as suvorexant has not been studied in this context.
Sources: en.wikipedia.org
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.
No endogenous peptide with this exact sequence has been described as a circulating hormone or signalling molecule. The tetrapeptide was designed as a synthetic analogue based on fragments observed in pineal preparations. Any activity discussed in the literature therefore refers to administered material rather than to a natural pool of the compound.
It is not an approved medicine in major jurisdictions and does not appear in the major pharmacopoeias. Material is usually distributed as a research chemical or laboratory reagent. Such labelling places handling responsibility on the purchaser and does not indicate that a regulatory body has reviewed the substance.
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.