Epithalamin is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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 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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
=== Cardiac === In dermatomyositis, patients can develop myocarditis and cardiac conduction system abnormalities which may be detected if the patient undergoes special testing. However, these abnormalities typically have no symptoms or clinical consequences. More rarely, these abnormalities can cause greater issues and lead to arrhythmias, heart failure, or damage to heart valves. For those dermatomyositis patients who do have cardiac symptoms caused by the disease, their clinical course may be much worse than usual.
=== Railways === Caledonian Railway (Scotland) Commonwealth Railways (Australia) Central Railway (India) Chiltern Railways (England) China Railway, or China Railway Corporation, a national corporation in the People's Republic of China Consolidated Rail Corporation (Conrail), US Copper Range Railroad
== Chief Justices of Aden Colony == James Taylor Lawrence (1938–1942; died 1944) Charles Theodore Abbott (1940–41; acting and afterwards in Federation of Malaya) Geoffrey Barkitt Whitcombe Rudd (1944; acting and afterwards in Kenya) Ronald Knox-Mawer (1952; acting and afterwards in Fiji) Ralph Abercrombie Campbell (1956–1960; afterwards Chief Justice of the Bahamas, 1960) Richard Lyle Le Gallais (1960–1963)
== Etymology == The word poison was first recorded in English around the year 1200, meaning "a deadly potion or substance". It derives from the Old French poison or puison (12th century; Modern French: poison), originally meaning "a drink", particularly a medicinal one. By the 14th century, the term had come to signify "a (magic) potion" or "poisonous drink". These uses trace back to the Latin word potionem (nominative: potio), meaning "a drinking" or "a drink", and more specifically "a poisonous drink", as seen in the writings of Cicero. The Latin root comes from the verb potare, meaning "to drink". The use of poison as an adjective in the form poisonous dates back to the 1520s. The practice of using poison in combination with plant names began in the 18th century. For example, the term poison oak was first recorded in 1743, and poison ivy appeared in usage by 1784. The expression poison gas was first used during World War I in 1915.
Sources: en.wikipedia.org
The serous membrane (or serosa) is a smooth epithelial membrane of mesothelium lining the contents and inner walls of body cavities, which secrete serous fluid to allow lubricated sliding movements between opposing surfaces. The serous membrane that covers internal organs (viscera) is called visceral, while the one that covers the cavity wall is called parietal. For instance the parietal peritoneum is attached to the abdominal wall and the pelvic walls. The visceral peritoneum is wrapped around the visceral organs. For the heart, the layers of the serous membrane are called parietal and visceral pericardium. For the lungs they are called parietal and visceral pleura. The visceral serosa of the uterus is called the perimetrium. The potential space between two opposing serosal surfaces is mostly empty except for the small amount of serous fluid. The Latin anatomical name is tunica serosa. Serous membranes line and enclose several body cavities, also known as serous cavities, where they secrete a lubricating fluid which reduces friction from movements. Serosa is entirely different from the adventitia, a connective tissue layer which binds together structures rather than reducing friction between them. The serous membrane covering the heart and lining the mediastinum is referred to as the pericardium, the serous membrane lining the thoracic cavity and surrounding the lungs is referred to as the pleura, and that lining the abdominopelvic cavity and the viscera is referred to as the peritoneum.
The common death adder (Acanthophis antarcticus) is a highly venomous snake species with a 50–60% untreated mortality rate. It is also the fastest striking venomous snake in the world. A death adder can go from a strike position, to strike and envenoming their prey, and back to strike position again, in less than 0.15 seconds. The SC LD50 value is 0.4 mg/kg and the venom yield per bite can range anywhere from 70–236 mg. Unlike other snakes that flee from approaching humans crashing through the undergrowth, common death adders are more likely to sit tight and risk being stepped on, making them more dangerous to the unwary bushwalker. They are said to be reluctant to bite unless actually touched.
Aleme Eshete observes that “the ‘Mahal Safari’ movement may be taken as the first signal that alerted the Ethiopian Government of a Bolshevik-type popular movement,” indicating that the term later took on broader political connotations.
== Research directions == Primary sclerosing cholangitis (PSC) is one of the most common cholestatic liver diseases, yet treatment options remain limited. Treatment for primary biliary cholangitis (PBC) is often done with ursodeoxycholic acid (UDCA) and with no other suitable alternative, it poses a problem for those that are not responsive to (UDCA). However, with advancing technology in the molecular biochemistry field and higher understanding of bile acid regulation, novel pharmacological treatments have been considered. For patients with primary biliary cholangitis, current guidelines recommend about 13–15 mg/kg of ursodeoxycholic acid as a first line treatment. This drug stimulates biliary bicarbonate secretion, improves survival without having to resort to a liver transplantation, and is very well tolerated—making it an ideal treatment. However, around 40% of patients with primary biliary cholangitis are not responsive to UDCA. Obeticholic acid has been approved by the US Food and Drug Administration for PBC in 2016 after experiments found beneficial improvements for the liver in half of patients with inadequate response to UDCA. Primary sclerosing cholangitis is a challenging liver disease as treatment options are limited. There is still uncertainty about the efficacy of ursodeoxycholic acid for PSC and researchers offer conflicting recommendations. One study found UDCA had improved biochemical functions but did lower the rate for death or transplant-free survival.
6'-deoxychalcone synthase (EC 2.3.1.170) is an enzyme that catalyzes the synthesis of the polyketide, isoliquiritigenin, from one unit of coumaroyl-CoA and three of malonyl-CoA. The enzyme requires reduced nicotinamide adenine dinucleotide phosphate (NADPH) to activate its substrate. It is present in Glycyrrhiza echinata (Russian licorice) and other leguminous plants, where it is part of the pathway to phytoalexins such as the flavanone, liquiritigenin.
Sources: en.wikipedia.org
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.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
It is a four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine. The chain is unmodified and contains only standard proteinogenic residues, which makes it straightforward to produce by solid-phase synthesis and to characterise by standard peptide methods.