tetrapeptide raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-04-06 and is reviewed periodically as new material appears.
The compound is generally described as a synthetic analogue of a fragment isolated from a pineal gland extract. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology introduced it during the 1980s and 1990s while studying short peptides from animal tissue. The original extract, called epithalamin, is a heterogeneous mixture, whereas epitalon is a single defined sequence. That distinction matters because findings reported for the extract are not automatically findings about the pure tetrapeptide, and claims about broader biological effects remain a separate question from the chemical identity described here.
Residue composition is the property that most cleanly separates verified material from mislabelled samples. Alanine, glutamate, aspartate and glycine appear in that order from the N-terminus, and the two acidic residues sit in the middle of the chain. Because the peptide is short, it can be produced by solid-phase synthesis and characterised by mass spectrometry without ambiguity. Any reported sample whose measured mass departs substantially from 390 daltons is a different compound or a degraded mixture rather than epitalon.
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 |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four constituent residues |
| Molecular mass | About 390.35 Da | Monoisotopic value, confirmed by mass spectrometry |
| Residue sequence | Ala-Glu-Asp-Gly | Read from the N-terminus to the C-terminus |
| Common synonyms | Epithalon; AEDG | Both forms appear in reference catalogues |
| Net charge near neutral pH | Negative | Two acidic side chains give a low isoelectric point |
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 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.
== History == Physicians historically used odors as a diagnostic indicator to judge a patient's health. Hippocrates saw the breath of patients as a potential indicator in around 400 BCE. Galen, Avicenna, and other physicians considered urine scent alongside color, density, sediments, and more in urinalysis. Urine with a sweet odor was diagnosed as possessing dominating sanguine humor relative to the other three humors; pungent odor as an excessive amount of bile; and foul odor as the presence of ulcers in the urinary tract or development of putrefactive fever, a fever occurring in the humors. VOCs are currently deemed as noninvasive diagnostic biomarkers with the potential for point-of-care (POC) testing and long-term monitoring.
Cyproheptadine is used to treat allergic reactions (specifically hay fever). There is evidence supporting its use for allergies, but second generation antihistamines such as ketotifen and loratadine have shown equal results with fewer side effects. It is also used as a preventive treatment against migraine. In a 2013 study the frequency of migraine was dramatically reduced in patients within 7 to 10 days after starting treatment. The average frequency of migraine attacks in these patients before administration was 8.7 times per month, this was decreased to 3.1 times per month at 3 months after the start of treatment. This use is on the label in the UK and some other countries. It is also used off-label in the treatment of cyclical vomiting syndrome in infants; the only evidence for this use comes from retrospective studies. Cyproheptadine is sometimes used off-label to improve akathisia in people on antipsychotic medications. It is used off-label to treat various dermatological conditions, including psychogenic itch, drug-induced hyperhidrosis (excessive sweating), and prevention of blister formation for some people with epidermolysis bullosa simplex. One of the effects of the drug is increased appetite and weight gain, which has led to its use (off-label in the USA) for this purpose in children who are wasting as well as people with cystic fibrosis.
== Preparation methods == Bean chips may be deep-fried or baked, and may be seasoned. A method of preparation uses dehulled, soaked beans that are blended with vegetable oil, salt, and a thickening agent. Using this method, the mixture is formed into a dough which is then steamed, after which the dough is sliced and the pieces are fried.
According to Google patent search, Masliah's name appears on 28 patents, including several patents filed by Prothena Biosciences, as well as earlier patents filed in conjunction with UCSD for drugs that target synucleopathies. Research trials on the drugs cerebrolysin and minzasolmin were also found to be based on questionable data from Masliah's lab. Masliah co-authored 21 papers on the pig brain extract cerebrolysin, eight of which have been discovered to have issues. Cerebrolysin is marketed as containing "neurotrophic peptides" but researchers using high performance liquid chromatography found that it does not contain peptides, and is largely composed of amino acids and salt, with some trace protein fragments. Some of the fraudulent papers on cerebrolysin co-authored by Masliah appear to have been quite influential in boosting interest in cerebrolysin, which is used today in countries like Russia to treat stroke, dementia, and other conditions. Masliah received funding for many of his cerebrolysin studies from the maker of cerebrolysin, EVER Pharma, and collaborated with Herbert Moessler, former general manager at EVER Pharma, who incidentally has 19 of his own papers flagged for anomalies. Moessler and Masliah started a company, Neuropore, to investigate the drug minzasolmin in 2008. On December 16, 2024 UCB reported that a phase II clinical trial on minzasolmin involving 496 people showed that minzasolmin failed to demonstrate superiority over placebo in both primary and secondary endpoints. Masliah has not publicly commented on any of the findings against him.
=== Osteoarthrtitis pain === As of 2012, the evidence was inconclusive as to whether SAM can mitigate the pain of osteoarthritis; clinical trials that had been conducted were too small from which to generalize.
Sources: en.wikipedia.org
== Africa == In countries such as Kenya, Lesotho, Mauritius, Nigeria, South Africa, Zambia, and Zimbabwe centenarians are often celebrated upon reaching their 100th Birthday by the locals and government. Former Senegalese President, Abdoulaye Wade, turned 100 on 29 May 2026, becoming the first state leader in West African history to become a centenarian.
Arsenic trioxide exerts its toxicity primarily through the induction of oxidative stress, disruption of cellular energy production, and interference with key protein functions. One major mechanism involves the generation of reactive oxygen species (ROS), leading to oxidative modifications of cellular biomolecules, organelle damage, and ultimately cell death. Arsenic trioxide also inhibits critical cellular enzymes such as pyruvate dehydrogenase, thereby disrupting mitochondrial ATP production and cellular respiration, which results in energy failure and can trigger both necrotic and apoptotic cell death. Furthermore, it can interfere with DNA repair processes by inhibiting enzymes involved in base and nucleotide excision repair and by interacting with protein structures such as zinc fingers in repair proteins. In cardiac tissues, arsenic trioxide disrupts ion channel function, notably by blocking the hERG potassium channel and altering calcium channel activity, which can lead to prolonged QT intervals and arrhythmias, sometimes causing fatal cardiac events. The broad range of affected signaling and metabolic pathways helps explain the widespread multi-organ toxicity associated with arsenic trioxide exposure.
Glutamate is used at the great majority of fast excitatory synapses in the brain and spinal cord. It is also used at most synapses that are "modifiable", i.e. capable of increasing or decreasing in strength. Modifiable synapses are thought to be the main memory-storage elements in the brain. Excessive glutamate release can overstimulate the brain and lead to excitotoxicity causing cell death resulting in seizures or strokes. Excitotoxicity has been implicated in certain chronic diseases including ischemic stroke, epilepsy, amyotrophic lateral sclerosis, Alzheimer's disease, Huntington disease, and Parkinson's disease. GABA is used at the great majority of fast inhibitory synapses in virtually every part of the brain. Many sedative/tranquilizing drugs act by enhancing the effects of GABA. Glycine is the primary inhibitory neurotransmitter in the spinal cord. Acetylcholine was the first neurotransmitter discovered in the peripheral and central nervous systems. It activates skeletal muscles in the somatic nervous system and may either excite or inhibit internal organs in the autonomic system. It is the main neurotransmitter at the neuromuscular junction connecting motor nerves to muscles. The paralytic arrow-poison curare acts by blocking transmission at these synapses. Acetylcholine also operates in many regions of the brain as neuromodulatory, but uses different types of receptors, including nicotinic and muscarinic receptors. Dopamine has a number of important functions in the brain. This includes critical role in the reward system, motivation and emotional arousal.
== Alternative carbon fixation pathways == RuBisCO is important biologically because it catalyzes the primary chemical reaction by which inorganic carbon enters the biosphere. While many autotrophic bacteria and archaea fix carbon via the reductive acetyl CoA pathway, the 3-hydroxypropionate cycle, or the reverse Krebs cycle, these pathways are relatively small contributors to global carbon fixation compared to that catalyzed by RuBisCO. Phosphoenolpyruvate carboxylase, unlike RuBisCO, only temporarily fixes carbon. Reflecting its importance, RuBisCO is the most abundant protein in leaves, accounting for 50% of soluble leaf protein in C3 plants (20–30% of total leaf nitrogen) and 30% of soluble leaf protein in C4 plants (5–9% of total leaf nitrogen). Given its important role in the biosphere, the genetic engineering of RuBisCO in crops is of continuing interest (see below).
Sources: en.wikipedia.org
Molecular diagnostics are used to identify infectious diseases such as chlamydia, influenza virus and tuberculosis; or specific strains such as H1N1 virus or SARS-CoV-2. Genetic identification can be swift; for example a loop-mediated isothermal amplification test diagnoses the malaria parasite and is rugged enough for developing countries. But despite these advances in genome analysis, in 2013 infections are still more often identified by other means—their proteome, bacteriophage, or chromatographic profile. Molecular diagnostics are also used to understand the specific strain of the pathogen—for example by detecting which drug resistance genes it possesses—and hence which therapies to avoid. In addition, assays based on metagenomic next generation sequencing can be implemented to identify pathogenic organisms without bias.
== Other uses == The synthesis of 6-acetyl-1,2,3,4-tetrahydropyridine, an important bread aroma compound, starting from 2-piperidone was accomplished using t-boc anhydride. (See Maillard reaction). The first step in this reaction sequence is the formation of the carbamate from the reaction of the amide nitrogen with boc anhydride in acetonitrile using DMAP as a catalyst.
The process continued until 1817, when Sertürner published his results after thirteen years of research and a nearly disastrous trial on himself and three boys. The great advantage of purified morphine was that a patient could be treated with a known dose—whereas with raw plant material, as Gabriel Fallopius once lamented: "if soporifics are weak they do not help; if they are strong they are exceedingly dangerous". Morphine was the first pharmaceutical isolated from a natural product, and this success encouraged the isolation of other alkaloids: by 1820, isolations of noscapine, strychnine, veratrine, colchicine, caffeine, and quinine were reported. Morphine sales began in 1827, by Heinrich Emanuel Merck of Darmstadt, and helped him expand his family pharmacy into the Merck KGaA pharmaceutical company. Codeine was isolated in 1832 by Pierre Jean Robiquet. The use of diethyl ether and chloroform for general anesthesia began in 1846–1847, and rapidly displaced the use of opiates and tropane alkaloids from Solanaceae due to their relative safety. Heroin, the first semi-synthetic opioid, was first synthesized in 1874, but was not pursued until its rediscovery in 1897 by Felix Hoffmann at the Bayer pharmaceutical company in Elberfeld, Germany. From 1898 to 1910 heroin was marketed as a non-addictive morphine substitute and cough medicine for children. Because the lethal dose of heroin was viewed as a hundred times greater than its effective dose, heroin was advertised as a safer alternative to other opioids.
Sources: en.wikipedia.org
It is a four-amino-acid peptide built from alanine, glutamate, aspartate and glycine in that order. Its formula is C14H22N4O9, and it is made by chemical synthesis rather than extracted from tissue. The synthetic peptide is a single defined molecule, unlike the pineal extracts it is often compared with.
No. The two spellings refer to the same tetrapeptide, and the difference reflects transliteration from Russian. Laboratories and catalogues use both forms interchangeably. The material is also indexed as AEDG, taken from the one-letter codes of its residues.
Epithalamin is a mixed preparation derived from animal pineal tissue and contains many peptides. Epitalon is one synthetic sequence chosen for study from that broader mixture. Statements about one do not transfer directly to the other.
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.