This is a working overview of AEDG, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-11-12. Anything still debated is marked as such rather than presented as settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
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.
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four-residue sequence |
| Molar mass | About 390.35 g/mol | Free peptide, counter-ion not included |
| Appearance | White to off-white powder | Lyophilised solid from aqueous solution |
| Water solubility | Freely soluble | Short, polar peptide chain |
| Common synonyms | AEDG; epithalone | Catalogues use the names interchangeably |
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.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
OR is the root name (Olfactory Receptor superfamily) n = an integer representing a family (e.g., 1-56) whose members have greater than 40% sequence identity, X = a single letter (A, B, C, ...) denoting a subfamily (>60% sequence identity), and m = an integer representing an individual family member ("isoform", in the sense of a paralog). For example, OR1A1 in the first isoform of subfamily A of olfactory receptor family 1. Members belonging to the same subfamily of olfactory receptors (>60% sequence identity) are likely to recognize structurally similar odorant molecules. In the HUGO scheme, families 1–14 are assigned to gamma ORs and families 51–56 are assigned to alpha and beta ORs (beta is only present as a pseudogene). The HUGO scheme only covers type 1 ORs. The type 2 OR-family proteins found in humans include GPR148 of the theta-1 subclade and a pseudogene of the kappa family.
X-ray diffraction studies of microcrystals revealed atomistic details of core region of amyloid, although only for simplified peptides having a length remarkably shorter than that of peptides or proteins involved in disease. The crystallographic structures show that short stretches from amyloid-prone regions of amyloidogenic proteins run perpendicular to the filament axis, consistent with the "cross-β" feature of amyloid structure. They also reveal a number of characteristics of amyloid structures – neighboring β-sheets are tightly packed together via an interface devoid of water (therefore referred to as dry interface), with the opposing β-strands slightly offset from each other such that their side-chains interdigitate. This compact dehydrated interface created was termed a steric-zipper interface. There are eight theoretical classes of steric-zipper interfaces, dictated by the directionality of the β-sheets (parallel and anti-parallel) and symmetry between adjacent β-sheets. A limitation of X-ray crystallography for solving amyloid structure is represented by the need to form microcrystals, which can be achieved only with peptides shorter than those associated with disease. Although bona fide amyloid structures always are based on intermolecular β-sheets, different types of "higher order" tertiary folds have been observed or proposed. The β-sheets may form a β-sandwich, or a β-solenoid which may be either β-helix or β-roll. Native-like amyloid fibrils in which native β-sheet containing proteins maintain their native-like structure in the fibrils have also been proposed.
The central nervous system (CNS), comprising the brain and spinal cord. Nerves that transmit signals from the CNS are called motor nerves. Nerves that exit from the brain are called cranial nerves while those exiting from the spinal cord are called spinal nerves. The peripheral nervous system (PNS), comprising mainly nerves, enclosed bundles of axons. The PNS is divided into: The somatic nervous system, which links the brain and spinal cord to sensory receptors and skeletal muscle. The autonomic nervous system, which is subdivided into: The sympathetic nervous system. The parasympathetic nervous system. The enteric nervous system, which controls the gastrointestinal system. The neurovascular unit comprises the cells and vasculature channels within the nervous system that regulate cerebral blood flow.
Sources: en.wikipedia.org
== Case Study: Ocean Euxinia == Because green-pigmented green sulfur bacteria require higher light intensities than their brown-pigmented counterparts, the presence of chlorobactane in the rock record has been used as key evidence in interpretations for a very shallow euxinic layer in the ocean. The euxinic zone may have changed depth in the ocean at various points in Earth's history, such as with the advent of an oxygenated atmosphere around 2.45 billion years ago and the shallowing of the oxic zone within the last six kyr.
changes, most probably the behaviors of people in the community have changed from their normal patterns before the outbreak, or the disease has mutated to a new form. Costive massive detection and isolation of susceptible close contacts have effects on reducing
28 April: Education Minister Erica Stanford announces that the New Zealand Government will invest $53 million in covering teachers' registration and practising certificate fees over the next three years. The Ministry for Primary Industries lifts biosecurity restrictions at a Mainland Poultry farm in Otago where the H7N6 avian influenza strain was detected in late 2024. 29 April: Mayor of Wellington Tory Whanau confirms she will not contest the 2025 Wellington mayoral election and endorses Andrew Little. Fonterra confirms it will close its Hamilton canning and packing facility in July 2025, affecting 120 jobs. 30 April: New Zealand–Philippines relations: Defence Minister Judith Collins signs a visiting forces agreement with her Philippine counterpart, Gilbert Teodoro, in Manila. Education Minister Erica Stanford and Finance Minister Nicola Willis confirm that the NZ Government will introduce financial literacy into the primary school curriculum from 2027. Justice Minister Paul Goldsmith announces that the NZ Government will reinstate a blanket ban on prisoners voting.
Sources: en.wikipedia.org
== Work == During his career, Roderich Süssmuth worked in the field of peptide synthesis, addressing current research questions from both a chemical perspective (natural product synthesis) and a biological perspective, particularly with regard to new classes of active compounds with activity against fungi, bacteria, and viruses. Compounds derived from plant-pathogenic bacteria such as Xanthomonas albilineans play an important role, including albicidin, which is an inhibitor of plant gyrase and also a highly potent antibacterial agent. He elucidated the structure of the antibacterial compound albicidin, investigated its biosynthesis, developed the total synthesis of the peptide, and studied a range of bacterial resistance factors, mostly from plant-associated bacteria. Another example is the recent elucidation of a lipopeptide from Burkholderia sp., which exhibits pronounced activity against plant-pathogenic fungi. Another area of research involves fungal toxins of the death cap mushroom, phalloidin and amanitin, for which total syntheses were developed and, with the ansamer concept, a novel non-classical atropisomerism was described.
== In cooking == Many thickening agents require extra care in cooking. Some starches lose their thickening quality when cooked for too long or at too high a temperature; on the other hand, cooking starches too short or not hot enough might lead to an unpleasant starchy taste or cause water to seep out of the finished product after cooling. Also, higher viscosity causes foods to burn more easily during cooking. As an alternative to adding more thickener, recipes may call for reduction of the food's water content by lengthy simmering. When cooking, it is generally better to add thickener cautiously; if over-thickened, more water may be added but loss of flavour and texture may result. Food thickening can be important for people facing medical issues with chewing or swallowing, as foods with a thicker consistency can reduce the chances of choking, or of inhalation of liquids or food particles, which can lead to aspiration pneumonia.
=== Ethnicity === The total prevalence of glaucoma is about the same in North America and Asia, but the prevalence of angle-closure glaucoma is four times higher in Asia than in North America. In the United States, glaucoma is more common in African Americans, Latinos, and Asian-Americans.
=== Surgery === A surgery of any type inherently carries more risks when done on a patient who has (especially moderate to severe) OI. Skeletal deformities and dentinogenesis imperfecta may hinder access to the airway. Use of, and weaning off of, mechanical ventilation is also more challenging to carry out on patients with OI. During the procedure itself or the healing process, defective OI collagen may lead to bleeding diatheses. The safety of anesthesia is also of more concern among patients with OI, with anesthetic complications 5.6x more likely to occur when the patient has OI type III. A unique concern of anesthesia in OI is perioperative fracture—fractures sustained due to patient transfer and airway access techniques that, while routine when a patient's bones are strong, may cause injury with brittle OI bones. As an example, due to a 1972 report of a humerus fracture from a sphygmomanometer cuff sustained in an OI patient during surgery, blood pressure monitoring protocols are often modified for patients with OI, with neonatal size cuffs and machine settings being used even in adults; further, the least deformed of the patient's limbs is preferred to receive the cuff.
Sources: en.wikipedia.org
It is a synthetic tetrapeptide built from alanine, glutamate, aspartate and glycine. The four residues are joined by standard peptide bonds, giving a linear chain rather than a branched structure.
The name derives from epithalamin, a pineal gland extract studied in the former Soviet Union. Researchers proposed that short fragments of that extract carried the biological activity of interest.
No major regulatory agency has approved it as a medicine. It is handled as a research chemical, and products sold under this name are not standardised drugs with defined clinical labelling.
The peptide contains four residues in the order alanine, glutamate, aspartate and glycine, abbreviated AEDG. The chain is linear and held together by three peptide bonds. Its calculated mass for the uncharged free form is about 390.3 daltons.