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 2025-08-30 and is reviewed periodically as new material appears.
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.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
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.
| 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.
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.
Epitalon is a synthetic tetrapeptide whose four residues are alanine, glutamate, aspartate and glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9 and its monoisotopic mass is near 390.35 daltons. The peptide carries two acidic side chains, so it is neutral to negatively charged in most aqueous buffers. Published reference summaries usually list it under both spellings, epitalon and epithalon, and treat the two names as the same material.
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.
=== Media preparation and washing units === The washing unit provides cleaning services for laboratory glassware and plasticware. It handles laundering of work clothing and decontamination of genetically modified organism (GMO) waste and hazardous laboratory waste. The media preparation unit prepares cultivation media and solutions for tissue culture. It produces bacteriological media and agar plates.
CPA is metabolized primarily by hydroxylation via CYP3A4, forming the major active metabolite 15β-hydroxycyproterone acetate. This metabolite circulates at concentrations approximately twice those of CPA, and has similar antiandrogen activity to that of CPA but only 10% of its activity as a progestogen. As a result, the co-administration of CPA with drugs which inhibit CYP3A4 may increase its potency as a progestogen. Some CPA is reportedly metabolized by hydrolysis into cyproterone and acetic acid. However, unlike many other steroid esters, CPA is not extensively hydrolyzed, and much of the pharmacological activity of the drug is attributable to CPA itself in its unchanged form. Cyproterone has approximately one-third the potency of CPA as an antiandrogen and is devoid of progestogenic activity. The elimination half-life of oral CPA is relatively long at approximately 1.6 to 2.2 days (38 to 53 hours), but possibly as long as 3.6 to 4.3 days (86 to 100 hours). The half-life of 15β-OH-CPA with oral administration of CPA is 2.6 days. The elimination half-life of CPA is prolonged in obese patients, which may be due to relatively greater storage of CPA in fat. The elimination half-life of CPA is also longer in older individuals; it is approximately twice as long in elderly men than in younger men (95 hours and 45 hours, respectively). When given via depot intramuscular injection, CPA has an elimination half-life of 3 to 4.3 days while 15β-OH-CPA has a half-life of 5.2 days. The duration of action of a single intramuscular injection of CPA is about 14 to 20 days.
In 2022, the University of North Carolina established two student awards in his name, funded in part by gifts from Wadden and his sister, Anne Wadden Peck: one for training in clinical and health psychology and another for distinguished research in behavioral medicine and health psychology.
Conduction velocity The speed at which an action potential travels along a nerve fiber. It is influenced by factors such as axon diameter and myelination. Consciousness A state of awareness of self and the environment. In neuroscience, it involves the coordinated activity of multiple brain regions, particularly the thalamocortical system. Corpus callosum The largest white matter structure in the brain, consisting of a thick band of axons that connects the left and right cerebral hemispheres. Cortical column A vertically organized group of neurons in the cerebral cortex that processes the same type of information, such as orientation or location in space. It is a basic functional unit of the cortex. Cortical plasticity The ability of the cerebral cortex to adapt and reorganize in response to experience, learning, or injury. Corticospinal tract A major descending pathway from the motor cortex to the spinal cord that mediates voluntary motor control, especially fine movements of the limbs. Creutzfeldt–Jakob disease (CJD) A rare and fatal neurodegenerative disorder caused by misfolded prion proteins. It leads to rapid cognitive decline, motor dysfunction, and ultimately death. Critical period A developmental window during which the nervous system is particularly sensitive to certain environmental stimuli, crucial for proper development of functions such as vision and language. Cross modal plasticity The ability of one sensory modality to reorganize and compensate in another’s absence (e.g., visual cortex being recruited for touch in individuals who are blind).
==== Behavioral consequences ==== The hyperactivity and difficulties in emotional regulation found in pediatric patients (children) are not reported in adults. OSA in adults is nevertheless associated with personality changes and automatic behavior. The biggest impact of OSA is the excessive daytime sleepiness (EDS), reported in approximately 30% of OSA patients. EDS can be caused by the disturbance of sleep quality, the insufficient sleep duration or the sleep fragmentation and it is responsible for further complications as it may lead to depressive symptoms, impairments of social life and decreased effectiveness at work. Studies have shown that those consequences of EDS can be improved following a CPAP treatment.
Sources: en.wikipedia.org
== Society and culture == Many societies have a system for organ donation, in which a living or deceased donor's organ are transplanted into a person with a failing organ. The transplantation of larger solid organs often requires immunosuppression to prevent organ rejection or graft-versus-host disease. There is considerable interest throughout the world in creating laboratory-grown or artificial organs.
Paper-based microfluidic devices are proposed to provide portable, cheap, and user-friendly medical diagnostic systems. Paper based microfluidics rely on the phenomenon of capillary penetration in porous media. To tune fluid penetration in porous substrates such as paper in two and three dimensions, the pore structure, wettability and geometry of the microfluidic devices can be controlled while the viscosity and evaporation rate of the liquid play a further significant role. Many such devices feature hydrophobic barriers on hydrophilic paper that passively transport aqueous solutions to outlets where biological reactions take place. Paper-based microfluidics are considered as portable point-of-care biosensors used in a remote setting where advanced medical diagnostic tools are not accessible. Current applications include portable glucose detection and environmental testing, with hopes of reaching areas that lack advanced medical diagnostic tools.
== Inhibition == Although cartilage breakdown is important for the metabolic process and removing dead cells, unregulated degradation can cause illness. The regulatory mechanisms in place are inhibitory proteins known as tissue inhibitors of metalloproteinases. A large contributor to the inhibition is TIMP3 halting enzymes ADAMTS4 and ADAMTS5. In order for TIMP3 to conduct its functions it binds to negatively charged components of the extracellular matrix allowing it to remain localized where aggrecan degradation occurs. The inhibition has been shown to be more of a reactionary response instead of a precautionary action. It increases its expression when conditions such as osteoarthritis is present. Along with the natural inhibition of TIMP3 scientist are conducting research to create synthetic inhibitors. This is a work in progress as the main issue is the inhibitors are not specific enough and are blocking other enzymes.
In 2002, the Nobel Prize in Chemistry was awarded to John Bennett Fenn for the development of electrospray ionization (ESI) and Koichi Tanaka for the development of soft laser desorption and their application to the ionization of biological macromolecules, especially proteins.
Sources: en.wikipedia.org
=== Effects on sugar absorption and insulin secretion === Gymnemic acid compounds in Gymnema sylvestre can also attach to receptors on the intestinal walls, helping to reduce absorption of sugar molecules in the gut. This process can lower blood sugar and promote insulin secretion and release. However, its antidiabetic properties were not confirmed in rats.
== Career and research == In 1981, Busslinger joined the lab of Richard A. Flavell at the MRC Institute Mill Hill in London as a postdoctoral fellow. There, he discovered that a single nucleotide mutation in the first intron of the β-globin gene causes β+-thalassemia and that DNA methylation of promoter sequences prevents gene transcription. In 1983, Busslinger became a Group Leader at the Institute of Molecular Biology II of the University of Zurich. Here, he discovered a new set of histone genes of the sea urchin and identified a tissue-specific transcription factor (TSAP) as an essential regulator of these genes, which later turned out to be a member of the Paired box (Pax)-containing transcription factor family. In 1987, Max Birnstiel recruited Busslinger to join the newly founded Research Institute of Molecular Pathology (IMP) in Vienna, Austria, as one of the first Senior Scientists. In 1996, Busslinger was appointed Professor at the University of Vienna. In 2007, he became the IMP's Director of Academic Affairs and, in 2013, Scientific Deputy Director. At the IMP, Busslinger changed his research focus from sea urchin embryogenesis to B cell immunology, which was promoted by the identification of a B-cell-specific transcription factor as a mammalian homologue of the sea urchin regulator TSAP. Protein purification and sequencing identified the B-cell-specific transcription factor as Pax5, and gene inactivation in the mouse defined Pax5 an essential regulator of B cell development.
The American National Library of Medicine also stated in an article in 2018 that the consequences of FGM/C have both physiological and psychological complications, including short- and long-term complications. The method in which the procedure is performed may determine the extent of the short-term complications. If the process was completed using unsterile equipment, no antiseptics, and no antibiotics, the victim may have increased risk of complications. Primary infections include staphylococcus infections, urinary tract infections, excessive and uncontrollable pain, and hemorrhaging. Infections such as human immunodeficiency virus (HIV), Chlamydia trachomatis, Clostridium tetani, and herpes simplex virus (HSV) 2 are significantly more common among women who underwent Type 3 mutilation compared with other categories.
== History after 1936 == Moniz rapidly disseminated his results through articles in the medical press and a monograph in 1936. Initially, however, the medical community appeared hostile to the new procedure. On 26 July 1936, one of his assistants, Diogo Furtado, gave a presentation at the Parisian meeting of the Société Médico-Psychologique on the results of the second cohort of patients leucotomised by Lima. Sobral Cid, who had supplied Moniz with the first set of patients for leucotomy from his own hospital in Lisbon, attended the meeting and denounced the technique, declaring that the patients who had been returned to his care post-operatively were "diminished" and had experienced a "degradation of personality". He also claimed that the changes Moniz observed in patients were more properly attributed to shock and brain trauma, and he derided the theoretical architecture that Moniz had constructed to support the new procedure as "cerebral mythology." At the same meeting the Parisian psychiatrist, Paul Courbon, stated he could not endorse a surgical technique that was solely supported by theoretical considerations rather than clinical observations. He also opined that the mutilation of an organ could not improve its function and that such cerebral wounds as were occasioned by leucotomy risked the later development of meningitis, epilepsy and brain abscesses.
=== DNA testing === After a disease-causing mutation has been identified in an index case (which is not always accomplished conclusively), the main task is genetic identification of carriers within a pedigree, a sequential process known as "cascade testing". Family members with the same mutation may show different severities of disease, a phenomenon known as "variable penetrance". As a result, some may remain asymptomatic, with little lifelong evidence of disease. Nevertheless, their children remain at risk of inheriting the disorder and potentially being more severely affected.
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.
It is based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.