This is a working overview of pineal peptides, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-28. Anything still debated is marked as such rather than presented as settled.
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 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.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
| 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 |
The compound is generally presented as a synthetic fragment of epithalamin, a pineal gland extract investigated in the former Soviet Union from the 1970s onward. Vladimir Khavinson and colleagues in Saint Petersburg developed short peptides modelled on such extracts, and epitalon became the most widely cited of those sequences. Most primary reports appeared in Russian-language journals or in proceedings with limited international circulation. Independent replication in laboratories outside that network remains sparse, and much repeated secondary material traces back to a small number of originating groups.
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.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
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 four substrates of this enzyme are 4-aminobenzoic acid, reduced nicotinamide adenine dinucleotide (NADH), oxygen and a proton. Its products are 4-aminophenol, oxidised NAD+, water, and carbon dioxide. Nicotinamide adenine dinucleotide phosphate can be used as an alternative cofactor. The enzyme is a flavin-containing monooxygenase that uses molecular oxygen as oxidant and incorporates one of its atoms into the starting material. The systematic name of this enzyme class is 4-aminobenzoate,NAD(P)H:oxygen oxidoreductase (1-hydroxylating, decarboxylating). Other names in common use include 4-aminobenzoate hydroxylase, and 4-aminobenzoate monooxygenase. It uses flavin adenine dinucleotide as a cofactor.
=== Protein purification === Because of the mild elution conditions (biotin plus wash buffer) SBP-Tagged proteins can be generated in a relatively pure state with a single purification step. There are several relatively abundant mammalian proteins that inherently associate with the IMAC matrices that bind to the more commonly used Polyhistidine-tag (His-tag). For this reason non-IMAC purification protocols, including with the SBP-Tag, are often preferred for proteins that are expressed in mammalian cells.
Mathematical chemistry – area of study engaged in novel applications of mathematics to chemistry. It concerns itself principally with the mathematical modeling of chemical phenomena. Mechanochemistry – coupling of mechanical and chemical phenomena on a molecular scale. Molecular biology – study of interactions between the various systems of a cell. It overlaps with biochemistry. Petrochemistry – study of the transformation of petroleum and natural gas into useful products or raw materials. Phytochemistry – study of phytochemicals which come from plants. Radiochemistry – chemistry of radioactive materials. Sonochemistry – study of effect of sonic waves and wave properties on chemical systems. Synthetic chemistry – study of chemical synthesis.
In 2023, they released the album DJ E, their first album to be released under their Aymara name, Chuquimamani-Condori. The album received critical acclaim, landing at the #9 spot on Pitchfork's 2024 list entitled "The 100 Best Albums of the 2020s So Far". In 2025, Chuquimamani-Condori and their brother Joshua Chuquimia Crampton released a self-titled album under the name Los Thuthanaka (English: The Moths). The album received universal acclaim, and it was named as the best album of 2025 by Pitchfork. Their physical output to date has consisted solely of project studio or home studio recordings, with their first two LP's The Light That You Gave Me to See You (2013) and American Drift (2015), as well as EPs Bound Adam 2011 and Moth/Lake (2015) all being recorded in their Ford Ranger truck.
Glutathione S-transferase theta-1 is an enzyme that in humans is encoded by the GSTT1 gene. Glutathione S-transferase (GST) theta 1 (GSTT1) is a member of a superfamily of proteins that catalyze the conjugation of reduced glutathione to a variety of electrophilic and hydrophobic compounds. Human GSTs can be divided into five main classes: alpha, mu, pi, theta, and zeta. The theta class includes GSTT1 and GSTT2. The GSTT1 and GSTT2 share 55% amino acid sequence identity and both of them were claimed to have an important role in human carcinogenesis. The GSTT1 gene is located approximately 50kb away from the GSTT2 gene. The GSTT1 and GSTT2 genes have a similar structure, being composed of five exons with identical exon/intron boundaries.
Sources: en.wikipedia.org
Pharmacomicrobiomics is concerned with the interaction between drugs and the gut microbiome. Pharmacogenomics is the application of genomic technologies to drug discovery and further characterization of drugs related to an organism's entire genome. For pharmacology regarding individual genes, pharmacogenetics studies how genetic variation gives rise to differing responses to drugs. Pharmacoepigenetics studies the underlying epigenetic marking patterns that lead to variation in an individual's response to medical treatment.
== Relevance to immunology == Because fMet is present in proteins made by bacteria but not in those made by eukaryotes (other than in bacterially derived organelles), the immune system might use it to help distinguish self from non-self. Polymorphonuclear cells can bind proteins starting with fMet, and use them to initiate the attraction of circulating blood leukocytes and then stimulate microbicidal activities such as phagocytosis. Since fMet is present in proteins made by mitochondria and chloroplasts, more recent theories do not see it as a molecule that the immune system can use to distinguish self from non-self. Instead, fMet-containing oligopeptides and proteins appear to be released by the mitochondria of damaged tissues as well as by damaged bacteria, and can thus qualify as an "alarm" signal, as discussed in the Danger model of immunity. The prototypical fMet-containing oligopeptide is N-formylmethionine-leucyl-phenylalanine (FMLP) which activates leukocytes and other cell types by binding with these cells' formyl peptide receptor 1 (FPR1) and formyl peptide receptor 2 (FPR2) G protein coupled receptors (see also formyl peptide receptor 3). Acting through these receptors, the fMet-containing oligopeptides and proteins are part of the innate immune system; they function to initiate acute inflammation responses but under other conditions function to inhibit and resolve these responses. fMet-containing oligopeptides and proteins also function in other physiological and pathological responses.
== Types == Popliteal pterygium syndrome, a congenital condition affecting the face, limbs, or genitalia but named after the wing-like structural anomaly behind the knee. Pterygium (eye) or surfer's eye, a growth on the cornea of the eye. Pterygium colli or webbed neck, a congenital skin fold of the neck down to the shoulders. Pterygium inversum unguis or ventral pterygium, adherence of the distal portion of the nailbed to the ventral surface of the nail plate. Pterygium unguis or dorsal pterygium, scarring between the proximal nail fold and matrix.
Like all benzodiazepines, clonazepam is a GABA-positive allosteric modulator. One-third of individuals treated with benzodiazepines for longer than four weeks develop a dependence on the drug and experience a withdrawal syndrome upon dose reduction. High dosage and long-term use increase the risk and severity of dependence and withdrawal symptoms. Withdrawal seizures and psychosis can occur in severe cases of withdrawal, and anxiety and insomnia can occur in less severe cases of withdrawal. A gradual reduction in dosage reduces the severity of the benzodiazepine withdrawal syndrome. Due to the risks of tolerance and withdrawal seizures, clonazepam is generally not recommended for the long-term management of epilepsies. Increasing the dose can overcome the effects of tolerance, but tolerance to the higher dose may occur and adverse effects may intensify. The mechanism of tolerance includes receptor desensitization, down regulation, receptor decoupling, and alterations in subunit composition and in gene transcription coding. Tolerance to the anticonvulsant effects of clonazepam occurs in both animals and humans. In humans, tolerance to the anticonvulsant effects of clonazepam occurs frequently. Chronic use of benzodiazepines can lead to the development of tolerance with a decrease of benzodiazepine binding sites. The degree of tolerance is more pronounced with clonazepam than with chlordiazepoxide. In general, short-term therapy is more effective than long-term therapy with clonazepam for the treatment of epilepsy.
Sources: en.wikipedia.org
Eager to join this enterprise, Humboldt postponed plans to visit North America, instead preparing to travel from Cuba to South America, crossing the Isthmus of Panama and the Andes to Lima. He wrote to Baudin, proposing to join the expedition and offering to continue his journey independently if necessary. Humboldt’s decision to return to South America was influenced by scientific opportunities, such as the chance to study the Andes’ environmental effects on plant life and to meet the botanist José Celestino Mutis in Bogotá. This return also allowed for consolidation of previous research findings. During his time in Havana, Humboldt encountered the Scottish botanist John Fraser and his son, who had survived a shipwreck. Humboldt assisted them and arranged for Fraser’s son to join him in Mexico, though the latter chose to return to London. Fraser agreed to take two cases of Humboldt’s botanical specimens to England for safekeeping until they could be sent to Berlin. From Havana, Humboldt and Bonpland prepared to sail to Cartagena or Portobello, depending on conditions, intent on continuing their scientific exploration of South America.
The Covenant of Religious Socialists of Germany (Bund der Religiösen Sozialistinnen und Sozialisten Deutschlands, BRSD) is an organization of German Protestants who are working for a socialist society. It was founded in 1926 and was banned during the Nazi era (1933–1945), but reconstituted itself again, after the war.
By 1919, the company was able to commercialize production of citric acid from this source. The company developed expertise in fermentation technology as a result. These skills were applied to the deep-submergence mass production of penicillin, an antibiotic, during World War II in response to the need to treat injured Allied soldiers. The company also embarked on a global soil collection program related to improving production yields of penicillin which ultimately resulted in 135,000 samples. On June 2, 1942, the company incorporated under the Delaware General Corporation Law.
By 1980, the BSAP comprised about 46,000 personnel; 11,000 professionals (about 60% black), and the remainder reservists (mostly white). The organisation's rank structure was unique, with different levels of seniority existing for black and white officers respectively. Until 1976, black officers could rise no further than sub-inspector, while the commissioned ranks were all-white. Limitations on black aspirations were removed in 1976. The first promotion of African members to previously European-only ranks occurred on 21 October 1976 with 23 Sub-Inspectors and 8 Detective Sub-Inspectors, a week later, being promoted to Patrol Officers.
Mrs. Glover, the well-known Scientist, will receive applications for one week from ladies and gentlemen who wish to learn how to heal the sick without medicine, and with a success unequaled by any known method of the present day, at Dr. Kennedy's office, No. 71 South Common Street, Lynn, Mass. Lynn was a center of the shoe industry and most of Eddy's students were factory workers or artisans. She charged $100, raised a few weeks later to $300, for a three-week course of 12 lessons (reduced in 1888 to seven). Eddy based the lessons on a revised version of Quimby's "Questions and Answers" manuscript—now called "The Science of Man, by which the sick are healed, Embracing Questions and Answers in Moral Science"—and on three shorter manuscripts, "The Soul's Inquiry of Man", "Spiritualism", and "Individuality", which she had written for her classes. "Questions and Answers" began: "What is God?" The answer: "Principle, wisdom, love, and truth." Two books on mental healing appeared around that time that may have influenced Eddy's thinking: The Mental Cure (1869) and Mental Medicine (1872), both by Warren Felt Evans, another former patient of Quimby's. Eddy allowed her students to make copies of the manuscripts, but they were forbidden, under a $3,000 bond, from showing them to anyone. The students agreed to pay Eddy 10 percent annually of income derived from her work, and $1,000 if they failed to practice or teach it.
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 a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, often abbreviated AEDG. The molecule is linear and contains no modified residues, so it is fully described by its sequence.