This is a working overview of Epithalamin, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-24. Anything still debated is marked as such rather than presented as settled.
Identity and purity are checked by reversed-phase high-performance liquid chromatography, usually with ultraviolet detection near 214 nanometres, where the peptide bond absorbs. Mass spectrometry confirms the expected mass and reveals whether truncation products or adducts are present. Acid hydrolysis followed by amino acid analysis gives the residue ratio, which should approximate one alanine, one glutamate, one aspartate and one glycine. Counter-ions such as acetate or trifluoroacetate remain in the dried product and lower net peptide content, so a stated purity figure on a label does not by itself describe how much peptide a vial holds.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
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 |
|---|---|---|
| Storage temperature, solid | Approximately -20 C | Sealed, desiccated, protected from light |
| Typical identity method | Electrospray mass spectrometry | Protonated ion expected near 391 |
| Typical purity method | Reversed-phase HPLC | Ultraviolet detection near 214 nm |
| Common synonyms | Epithalon, epithalone, AEDG | Spelling variants appear in supplier catalogues |
| Solution stability | Days at 2-8 C | Hydrolysis and deamidation limit shelf life |
No national medicines regulator has approved epitalon as a therapeutic product. It is generally distributed as a research chemical, and in some jurisdictions selling peptides for human consumption without approval is restricted or prohibited. Certificates of analysis accompanying commercial material vary in which tests are performed, and independent verification of identity and purity is uncommon. Statements about anti-ageing or disease-prevention benefits on vendor pages are marketing claims rather than regulatory findings, a distinction that shapes how the compound is discussed in scientific and popular sources alike.
The most frequently cited laboratory finding is that AEDG increased telomerase activity and extended telomere length in cultured human somatic cells. That work used fetal fibroblast strains and reported changes in enzyme activity alongside altered division counts. Replication by unrelated groups has been limited, and the published record is largely a single-laboratory series rather than a multi-centre programme. The result supports a hypothesis about peptide influence on gene expression in cell culture; it does not by itself establish an effect on telomere length in living animals or in people.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
Rasburicase, sold under the brand name Elitek in the US and Fasturtec in the EU, is a medication that helps to clear uric acid from the blood. It is a recombinant version of urate oxidase, an enzyme that metabolizes uric acid to allantoin. Urate oxidase is known to be present in many mammals but does not naturally occur in humans. Rasburicase is produced by a genetically modified Saccharomyces cerevisiae strain. The complementary DNA (cDNA) coding for rasburicase was cloned from a strain of Aspergillus flavus. Rasburicase (Q00511) is a tetrameric protein with identical subunits. Each subunit is made up of a single 301 amino acid polypeptide chain with a molecular mass of about 34 kDa. The drug product is a sterile, white to off-white, lyophilized powder intended for intravenous administration following reconstitution with a diluent. Elitek (rasburicase) is supplied in 3 mL and 10 mL colorless, glass vials containing rasburicase at a concentration of 1.5 mg/mL after reconstitution. It is on the World Health Organization's List of Essential Medicines.
{\displaystyle Q={\begin{pmatrix}{-(a\pi _{C}+b\pi _{G}+c\pi _{T})}&a\pi _{C}&b\pi _{G}&c\pi _{T}\\a\pi _{A}&{-(a\pi _{A}+d\pi _{G}+e\pi _{T})}&d\pi _{G}&e\pi _{T}\\b\pi _{A}&d\pi _{C}&{-(b\pi _{A}+d\pi _{C}+f\pi _{T})}&f\pi _{T}\\c\pi _{A}&e\pi _{C}&f\pi _{G}&{-(c\pi _{A}+e\pi _{C}+f\pi _{G})}\end{pmatrix}}}
In the 1950s, the French established secret commando groups based on loyal Montagnard ethnic minorities referred to as "partisans" or "maquisards", called the Groupement de Commandos Mixtes Aéroportés (Composite Airborne Commando Group or GCMA), later renamed Groupement Mixte d'Intervention (GMI, or Mixed Intervention Group), directed by the SDECE counter-intelligence service. The SDECE's "Service Action" GCMA used both commando and guerrilla techniques and operated in intelligence and secret missions from 1950 to 1955. Declassified information about the GCMA includes the name of its commander, famous Colonel Roger Trinquier, and a mission on April 30, 1954, when Jedburgh veteran Captain Sassi led the Meo partisans of the GCMA Malo-Servan in Operation Condor during the siege of Dien Bien Phu. In 1951, Adjutant-Chief Vandenberghe from the 6th Colonial Infantry Regiment (6e RIC) created the "Commando Vanden" (aka "Black Tigers", aka "North Vietnam Commando #24") based in Nam Định. Recruits were volunteers from the Thổ people, Nùng people and Miao people. This commando unit wore Việt Minh black uniforms to confuse the enemy and used techniques of the experienced Bo doi (Bộ đội, regular army) and Du Kich (guerrilla unit). Việt Minh prisoners were recruited in POW camps. The commando was awarded the Croix de Guerre des TOE with palm in July 1951; however, Vandenberghe was betrayed by a Việt Minh recruit, commander Nguien Tinh Khoi (308th Division's 56th Regiment), who assassinated him (and his Vietnamese fiancée) with external help on the night of January 5, 1952.
=== Free-interface diffusion === This technique brings together protein and precipitation solutions without premixing them, but instead, injecting them through either sides of a channel, allowing equilibrium through diffusion. The two solutions come into contact in a reagent chamber, both at their maximum concentrations, initiating spontaneous nucleation. As the system comes into equilibrium, the level of supersaturation decreases, favouring crystal growth.
== Research == Cannabinoid receptors are found widely expressed in islets of Langerhans, and several studies have investigated specific distribution and mechanisms of CB1 versus CB2 receptors in relation to pancreatic endocrine functions, where they play an important homeostatic role, as endocannabinoids modulate pancreatic β-cells function, proliferation, and survival, as well as insulin production, secretion, and resistance.
Sources: en.wikipedia.org
Typically, people have fewer than 36 repeats in the polyQ region, which results in the normal production and cytoplasmic localization of the huntingtin. However, 36 or more repeats result in the production of a mutant huntingtin (mHTT), which causes degeneration of medium spiny neurons. Regions of the brain have differing amounts and reliance on these types of neurons and are affected accordingly. Generally, the number of CAG repeats is related to how much this process is affected, and accounts for about 60% of the variation of the age of the onset of symptoms. The remaining variation is attributed to the environment and other genes that modify the mechanism of HD. About 36 to 39 repeats result in a reduced-penetrance form of the disease, with a much later onset and slower progression of symptoms. In some cases, the onset may be so late that symptoms are never noticed. With very large repeat counts (more than 60), HD onset can occur below the age of 20, known as juvenile HD. Juvenile HD is typically of the Westphal variant that is characterized by slowness of movement, rigidity, and tremors. This accounts for about 7% of HD carriers.
=== Spinal drainage theory === Some studies have proposed that issues with the spinal venous drainage system may cause a CSF leak. According to this theory, dural holes and intracranial hypotension are symptoms caused by low venous pressure in the epidural space. When leg muscles pump blood towards the heart, and pressure in the inferior vena cava vein becomes negative, the network of epidural veins is overdrained, causing CSF to be aspirated into the epidural space. True leaks can form at weak points in the spinal meninges. Therefore, the observed CSF hypotension is a result of CSF hypovolemia and reduced epidural venous pressure.
Its use may increase the risk of seizures due to unopposed alpha-adrenergic stimulation, but some studies suggest naloxone may not significantly increase risk of seizure in acute overdose. For suspected serotonin syndrome, cyproheptadine, a serotonin antagonist, is considered an effective antidote. The incidence of tramadol-related overdose deaths has been on the rise in certain regions. For instance, Northern Ireland has reported an increased frequency of such cases. In 2013, England and Wales recorded 254 tramadol-related deaths, while Florida reported 379 cases in 2011. In 2011, 21,649 emergency room visits in the United States were related to tramadol. The likely explanation for these observations is due to increase in frequency of prescriptions and use due to easier access due to lighter regulatory scheduling by authorities but this is starting to change. In 2021, Health Canada announced tramadol would be added to Schedule I of the Controlled Drugs and Substances Act and to the Narcotic Control Regulations due to tramadol being suspected of having contributed to 18 reported deaths in Canada between 2006 and 2017.
The inauguration of Richard Nixon in January led to a reevaluation of the U.S. role in the war. U.S. forces peaked at 543,000 in April. U.S. military strategy remained relatively unchanged from the offensive strategy of 1968 until the Battle of Hamburger Hill in May which led to a change a more reactive approach. The U.S. and South Vietnam agreed on a policy of Vietnamization with South Vietnamese forces being expanded and equipped to take over more of the ground combat from the departing Americans which began to withdraw in late June without any reciprocal commitment by the North Vietnamese. The morale of U.S. ground forces began to fray with increasing racial tensions and the first instances of fragging and combat refusal. The antiwar movement in the U.S. continued to grow and public opinion turned increasingly antiwar when the Mỹ Lai massacre was revealed in November.
=== Urea cycle disorders === Disorders of the distal urea cycle, such as citrullinemia, argininosuccinic aciduria and argininemia are included in newborn screening programs in many jurisdictions that using tandem mass spectrometry to identify key amino acids. Proximal urea cycle defects, such as ornithine transcarbamylase deficiency and carbamoyl phosphate synthetase deficiency are not included in newborn screening panels because they are not reliably detected using current technology, and also because severely affected infants will present with clinical symptoms before newborn screening results are available. Some regions claim to screen for HHH syndrome (hyperammonemia, hyperornithinemia, homocitrullinuria) based on the detection of elevated ornithine levels in the newborn screening dried blood spot, but other sources have shown that affected individuals do not have elevated ornithine at birth.
Sources: en.wikipedia.org
GAVI, officially Gavi, the Vaccine Alliance (previously the GAVI Alliance, and before that the Global Alliance for Vaccines and Immunization) is a public–private global health partnership with the goal of increasing access to immunization in poor countries. It is the largest organisation distributing donations of money towards vaccines; from 1990 to 2016, more than a third of donor money for immunisation was channelled through Gavi. Gavi supports the immunization of almost half the world's children. Gavi has helped immunize over 760 million children, preventing over 13 million deaths worldwide, helping increase diphtheria vaccine coverage in supported countries from 59% in 2000 to 81% in 2019, contributing to reducing child mortality by half. It also seeks to improve the economics of vaccines, negotiating bulk prices, supporting price discrimination, and reducing the commercial risks that manufacturers face when selling vaccines to the poor and developing vaccines. It also provides funding to strengthen health systems and train health workers across the developing world, though the effectiveness of its health-system-strengthening programs is disputed. Along with Global Health Initiatives (GHIs) in general, Gavi was described as innovative, effective, and less bureaucratic than multilateral government institutions like the WHO. Gavi programmes may produce quantified results within an election cycle, which is appealing to parties locked in an election cycle.
Aerated chocolate is chocolate that has undergone foaming. It has a lower density than other types of chocolate, and a smoother mouthfeel as it melts. Aerated chocolate was first brought to market in 1935 by the British chocolate maker Rowntree's under the brand Aero. Although Rowntree patented the manufacturing process, other chocolate makers quickly began making their own products, and today several manufacturers make aerated chocolates. Aerated chocolate can be divided into four types. The most common, seen in Aero, has large bubbles and is produced under a vacuum, or by beating gas into liquid chocolate under pressure. Aerated chocolate with tiny bubbles uses the same beating gas method but with nitrogen. Aerated chocolates containing long tubes of air are extruded rather than moulded. The final type is an aerated chocolate with low fat content, held together by a skeleton of solid particles. They are made by first dissolving sugar, then forming an emulsion with other ingredients. It finally undergoes evaporation and drying or freeze drying to reduce the water content.
== June 8, 1915 (Tuesday) == Battle of Hébuterne — The Germans regrouped to slow the French advance and recaptured their second line by the end of the day. Born: Kayyar Kinhanna Rai, Indian poet, known for his poems and activism work for an independent India; in Kayyar, British India (present-day India) (d. 2015) Ruth Stone, American poet, recipient of 2002 National Book Award and 2002 Wallace Stevens Award for the poetry collection In the Galaxy; in Roanoke, Virginia, United States (d. 2011)
transcript of unknown function (TUF) Any RNA transcript whose function is unclear. Such transcripts may include functional non-coding RNAs which have not yet been studied in detail as well as spurious transcripts without any definite function. The DNA sequences from which TUFs are transcribed are generally located in intergenic or intronic regions of the genome. See also junk RNA.
Sources: en.wikipedia.org
The solid is kept cold, dry and dark, typically at minus twenty degrees Celsius, in a sealed container with desiccant. Dissolved material is kept refrigerated and used promptly. Freezing and thawing a solution repeatedly is avoided because it accelerates degradation.
Reversed-phase chromatography with ultraviolet detection gives a purity percentage, while mass spectrometry confirms identity. Amino acid analysis checks the residue composition. Buyers typically request a certificate of analysis showing these measurements for the specific lot.
It is not authorised as a medicine in the United States or the European Union. Material is sold there as a research chemical or cosmetic ingredient. Some related short peptides are registered drugs in Russia, which is a distinct national situation rather than a general approval.
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.