If you have been reading about AEDG 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 2025-09-10. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 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.
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.
| 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.
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.
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.
The group released one album in 1965 and three albums in 1966. Dino, Desi & Billy albums contained primarily versions of Top 40 songs made popular by others, with new content being minor. The three boys made an appearance in the Dean Martin film Murderers' Row and sang the Boyce & Hart song, "If You're Thinkin' What I'm Thinkin'". From 1966 to 1970, the group continued to release singles, encountering marginal success, which was not altered by a change of label to Columbia Records in 1969. Also in 1969, the group contributed three songs to the soundtrack of the surf film Follow Me. The group received top billing on the soundtrack album, despite the fact that most of the album featured music by composer Stu Phillips. Later in 1969 the group broke up, due in part to Desi joining his mother's television show and Hinsche wishing to commence university studies. The group was never a favorite of the critics. Writing for AllMusic, music critic Richie Unterberger characterized them as a group that "never had an ounce of credibility", with music that was "innocuously bland in the extreme." These sentiments may be contrasted with the fact that the band was well thought of by the Beach Boys, to the extent that Brian Wilson and Hinsche co-wrote one of the band's original songs, and their final single, "Lady Love". That single was released by Reprise Records in 1970, after the group had broken up. Hinsche's sister, Annie, married Carl Wilson and Hinsche himself worked with the Beach Boys as a backing musician for many years.
== Structural information == The structure of pea cytosolic APX was reported in 1995. The binding interaction of soybean cytosolic APX with its physiological substrate, ascorbate and with a number of other substrates are also known. As of late 2007, 12 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1APX, PDB: 1IYN, PDB: 1OAF, PDB: 1OAG, PDB: 1V0H, PDB: 2CL4, PDB: 2GGN, PDB: 2GHC, PDB: 2GHD, PDB: 2GHE, PDB: 2GHH, and PDB: 2GHK.
=== Penicillin === Penicillin is a group of antibiotics that have been effective against many bacterial infections. It attacks bacteria by targeting and inhibiting the transpeptidase that catalyzes the cross-linking of the amino sugars in peptidoglycan. However, pseudopeptidoglycan contains different amino sugars, and therefore, a different catalysis enzyme is used. The different amino acids cause antibiotics, that target cell walls like penicillin, to be ineffective against pseudopeptidoglycan.
== Function == Serpin A12 is a protease inhibitor with an approximate weight of 47 kDa and is a member of the adipokine family of cytokines excreted by adipose tissue. Members of this family regulate a number of cellular processes, such as inflammation mediation and insulin resistance. Made up of 414 amino acids, its main function is modulating the insulin inhibiting protease KLK7, mainly in adipose tissue. Among other functions, Serpin A12 performs insulin-sensitizing actions. Serpin A12 treatment of obese and insulin-resistant mice has been shown to decrease the expression of insulin resistance genes in white adipose tissue as well as improving carbohydrate resistance. Serpin A12 also increases bone density, which helps prevent osteoporosis. It does so by regulating osteoblasts, assisting in their mineralization of the bone matrix, thus balancing bone formation with bone resorption.
== Types of gel == The types of gel most typically used are agarose and polyacrylamide gels. Each type of gel is well-suited to different types and sizes of the analyte. Polyacrylamide gels are usually used for proteins and have very high resolving power for small fragments of DNA (5-500 bp). Agarose gels, on the other hand, have lower resolving power for DNA but a greater range of separation, and are therefore usually used for DNA fragments of 50–20,000 bp in size. (The resolution of over 6 Mb is possible with pulsed field gel electrophoresis (PFGE).) Polyacrylamide gels are run in a vertical configuration while agarose gels are typically run horizontally in a submarine mode. They also differ in their casting methodology, as agarose sets thermally, while polyacrylamide forms in a chemical polymerization reaction.
Sources: en.wikipedia.org
== Data Utility == Differential refractometers are often used for the analysis of polymer samples in size exclusion chromatography. Other types of information that can be gathered from differential refractometers are:
Senate Minority Leader Chuck Schumer criticized the investigation for undermining the Federal Reserve's independence and suggested that the investigation was being done to make Powell a scapegoat for public disapproval of Trump's handling of the U.S. economy and the administration's trade policies. After Trump announced that he would nominate Warsh to replace Powell on January 30, Tillis stated that he will oppose Warsh's nomination until the investigation into Powell is "fully and transparently resolved." Since the Senate Banking Committee's composition currently includes 13 Republicans and 11 Democrats, Tillis has the ability to block the committee from voting to advance Warsh's nomination to a full Senate confirmation vote. John Thune has said that Warsh will "probably not" be confirmed without support from Tillis. On February 4, Tillis, who is not seeking reelection in 2026, subsequently said that he will block Warsh's nomination for the remainder of the 119th United States Congress if the investigation continues until his term expires in January 2027, while the day before, Senate Democrats sitting on the Banking Committee called for a delay to the nomination until both the Powell investigation and the investigation of Lisa Cook were both ended. Tillis stated the previous September that he would not consider any replacement for Cook until the litigation was resolved.
The properties of quantum dots can be also tuned by the synthetic scheme, high temperature solvent/ligand mixtures that influence the nanocrystal properties. High-quality QD contrast agents are obtained at elevated temperatures; however, because they have lower water solubility, their usage as cell markers is limited. Further functionalization with hydrophilic ligands is required. The advantages of QD are represented by their fast action; they are able to label a target tissue or cell in seconds. In vivo studies show that QD are able to selectively label cancer cells, and they accumulate at tumor sites. Tumor cells labeled with QD can be tracked with multiphoton microscopy as they invade lung tissue. In both studies, spectral imaging and autofluorescent subtraction allowed multicolour in vivo visualization of cells and tissues. A major drawback of QD is their relatively high toxicity. Functionalizations with different substrates that increase bioaffinity and decrease toxicity are in progress. For instance, sulfur from the QD shell is able to form reversible disulfide bonds with a wide class of organic compounds.
== Mechanism of action == Naltrexone and its active metabolite, 6-β-naltrexol, are competitive antagonists at μ-opioid, κ-opioid, and, to a lesser extent, δ-opioid receptors. Standard therapeutic doses of naltrexone block these receptors, achieving two main effects: first, they prevent the inhibition of GABA receptors, which normally suppress neuron activity; many recreational drugs inhibit GABA, thereby increasing neuronal activation, and by blocking GABA inhibition, normal GABA activity resumes. Second, naltrexone blocks dopamine release, since many recreational drugs stimulate dopamine as part of the brain's reward system, which generates feelings of pleasure. As naltrexone is a competitive antagonist at the identical sites of action of many opioid agonists, such as morphine, care must be taken to ensure that low-dose naltrexone is not taken near the same time as these medications, as they will not be as efficacious in relieving pain.
Sources: en.wikipedia.org
== External links == Anorectics at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Mitchell, Kari (January 1997). "Anorexiant Agents: Considerations for Use" (PDF). Drug Therapy Topics. University of Washington Medical Center. Archived from the original (PDF) on 2013-12-26. Retrieved 25 December 2013.
==== Gold mining ==== Artisanal small-scale gold miners are at high risk to exposure of metal toxicants. While there is a wide array of hard metals that are toxic, mercury poses the greatest risk from inhalation and ingestion from environmental contamination.
Flagella are rigid protein structures, about 20 nanometres in diameter and up to 20 micrometres in length, that are used for motility. Flagella are driven by the energy released by the transfer of ions down an electrochemical gradient across the cell membrane. Fimbriae (sometimes called "attachment pili") are fine filaments of protein, usually 2–10 nanometres in diameter and up to several micrometres in length. They are distributed over the surface of the cell, and resemble fine hairs when seen under the electron microscope. Fimbriae are believed to be involved in attachment to solid surfaces or to other cells, and are essential for the virulence of some bacterial pathogens. Pili (sing. pilus) are cellular appendages, slightly larger than fimbriae, that can transfer genetic material between bacterial cells in a process called conjugation where they are called conjugation pili or sex pili (see bacterial genetics, below). They can also generate movement where they are called type IV pili. Glycocalyx is produced by many bacteria to surround their cells, and varies in structural complexity: ranging from a disorganised slime layer of extracellular polymeric substances to a highly structured capsule. These structures can protect cells from engulfment by eukaryotic cells such as macrophages (part of the human immune system). They can also act as antigens and be involved in cell recognition, as well as aiding attachment to surfaces and the formation of biofilms. The assembly of these extracellular structures is dependent on bacterial secretion systems.
== Research == There is ongoing research into several potential benefits of candesartan beyond established indications. Candesartan is being investigated for its neuroprotective and anti-inflammatory properties. In an early Alzheimer's disease mouse model, candesartan significantly reduced amyloid burden and inflammation and it is being examined as a potential treatment for early Alzheimer's. Rat models indicate that candesartan may have neuroprotective benefits that mitigate certain central mechanisms of ageing and senescence. Additionally, candesartan has shown potential therapeutic applications as an anti-anxiety agent. In a double-blind, placebo-controlled, randomized study, candesartan induced regression of left ventricular hypertrophy, and improved both LV function and exercise tolerance with no side effects in patients with non-obstructive hypertrophic cardiomyopathy. The unique anti-oxidative and anti-inflammatory effects of Candesartan are shown to offer superior renoprotection of chronic renal inflammation, and in ultrahigh doses and in a multidrug context, could be investigated as potentially inducing remission of chronic kidney disease.
Note that most commonly used lac or lac-derived promoters are based on the lacUV5 mutant which is insensitive to catabolite repression. This mutant allows for expression of protein under the control of the lac promoter when the growth medium contains glucose since glucose would inhibit gene expression if wild-type lac promoter is used. Presence of glucose nevertheless may still be used to reduce background expression through residual inhibition in some systems. Examples of E. coli expression vectors are the pGEX series of vectors where glutathione S-transferase is used as a fusion partner and gene expression is under the control of the tac promoter, and the pET series of vectors which uses a T7 promoter. It is possible to simultaneously express two or more different proteins in E. coli using different plasmids. However, when 2 or more plasmids are used, each plasmid needs to use a different antibiotic selection as well as a different origin of replication, otherwise one of the plasmids may not be stably maintained. Many commonly used plasmids are based on the ColE1 replicon and are therefore incompatible with each other; in order for a ColE1-based plasmid to coexist with another in the same cell, the other would need to be of a different replicon, e.g. a p15A replicon-based plasmid such as the pACYC series of plasmids. Another approach would be to use a single two-cistron vector or design the coding sequences in tandem as a bi- or poly-cistronic construct.
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.