A practical reference on epithalamin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-10-13. Anything still debated is marked as such rather than presented as settled.
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.
Stability depends strongly on pH, temperature and the presence of oxygen and trace metals. Cleavage of the backbone proceeds faster under neutral to alkaline conditions, whereas acidic solutions tend to slow that reaction. The aspartate and glutamate side chains can undergo deamidation or imide formation over time, generating closely related impurities. Published stability data specific to epitalon are sparse, so the usable life of a given solution is best regarded as an open question that depends on buffer composition, concentration and storage temperature.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography with ultraviolet detection, frequently near 214 nanometers where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the observed molecular mass and helps separate the intact peptide from truncated or modified forms. Amino acid analysis or tandem mass spectrometry can establish residue order. Purity is commonly quoted as an area percentage, yet such values are method-dependent, and comparisons between laboratories require matching column, gradient and detection wavelength.
Laboratory handling begins with dissolution of the lyophilized powder in water or a suitable aqueous buffer. The dry solid is the more stable form, so stock solutions are generally prepared only when required and kept cold afterwards. Repeated freezing and thawing of a solution is avoided because it encourages aggregation and gradual loss of the intact chain. Diluents and containers are selected to limit adsorption of a short peptide onto plastic surfaces and to reduce microbial growth in aqueous preparations.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Computed for the free acid of Ala-Glu-Asp-Gly |
| Molecular mass | About 390.35 g/mol | Free peptide; salt forms shift the value |
| Appearance | White to off-white solid | Typical of short peptides after freeze-drying |
| Solubility class | Freely soluble in water | Aqueous buffers are also commonly used |
| Common synonyms | Epitalon, epithalone, AEDG | AEDG is the single-letter sequence |
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.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
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.
（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.
Other techniques for determining the dosage of CPA have validated this extrapolation, for instance affinity studies and prostatic CPA levels. The affinity of CPA for the AR is around 20-fold lower than that of DHT, and an excess of CPA levels of around 20 to 30 times those of DHT would hence be expected to maximally neutralize androgen signaling. In accordance, different publications have stated based on preclinical experiments that a 2- to 5-fold excess of CPA can inhibit the effects of testosterone by 50%, a 3- to 10-fold excess of CPA can reduce the effects of "potent androgens" (presumably testosterone and/or DHT) by 50%, and a 10-fold excess of CPA can inhibit the effects of testosterone by "almost 100%". High-dose CPA has been found to achieve prostatic levels that are at least 30-fold those of DHT. One study found that levels of CPA in the prostate gland in men being treated with 200 mg/day oral CPA were about 28 times those of DHT. In accordance with the preceding findings, it has been stated that oral doses of CPA of at least 300 mg/day may achieve a combined androgen blockade action in the treatment of prostate cancer. At a dosage of CPA of 100 mg/day in men with prostate cancer, circulating levels of CPA (e.g., 350 ng/mL) are on the order of 200-fold higher than circulating levels of testosterone (e.g., 100 ng/dL). In men who have undergone orchiectomy, 50 mg/day oral CPA results in a 500-fold excess of circulating CPA relative to circulating testosterone.
== Sources == This article incorporates text from a free content work. Licensed under Creative Commons Attribution (license statement/permission). Text taken from Late Professor P N Saxena: A teacher of excellence, Rahman, SZ; Khan, RA (Nov 2010), J Pharmacol Pharmacother.
In 2014, when Russia-United States and Russia-NATO relations worsened over the Annexation of Crimea, the Russian state-owned television channel Russia 1 stated that "Russia is the only country in the world that is really capable of turning the USA into radioactive ash." U.S. Secretary of Defense Ash Carter considered proposing deployment of ground-launched cruise missiles in Europe that could pre-emptively destroy Russian weapons. In August 2017, North Korea warned that it might launch mid-range ballistic missiles into waters within 18 to 24 miles (29 to 39 km) of Guam, following an exchange of threats between the governments of North Korea and the United States. Escalating tensions between North Korea and the United States, including threats by both countries that they could use nuclear weapons against one another, prompted a heightened state of readiness in Hawaii. The perceived ballistic missile threat broadcast all over Hawaii on 13 January 2018 was a false missile alarm. In October 2018, the former Soviet leader Mikhail Gorbachev commented that U.S. withdrawal from the Intermediate-Range Nuclear Forces Treaty is "not the work of a great mind" and that "a new arms race has been announced". In early 2019, more than 90% of world's 13,865 nuclear weapons were owned by Russia and the United States. In 2019, Vladimir Putin warned that Russia would deploy nuclear missiles in Europe if the United States deployed intermediate-range nuclear missiles there.
== Research career == Garcia's research integrates approaches in structural biology, biochemistry and protein engineering to understand how cell surface receptors sense environmental cues through the engagement of extracellular ligands, and transduce signals. The overarching theme of the laboratory is to elucidate the structural and mechanistic basis of receptor activation in systems relevant to human disease, and to exploit this information to design and engineer new molecules with therapeutic properties. Thus there is a close integration of basic science discovery with translation. Garcia's laboratory at Stanford has published numerous scientific articles describing the molecular structure and signaling mechanisms of proteins important for immunity, neurobiology and development.
Sources: en.wikipedia.org
Christian missions also became an important way for spreading Western-style music in Meiji era. In the sixteenth century Portuguese missionaries introduced the first Western-style music to Japan: sacred choral music, music for organ, flute, harp, trumpet, violin, alto, double bass. However, soon Christianity, along with its institutions, was banned. In the Meiji era, the ban of Christianity was lifted. Thus, Catholic, Orthodox and Protestant missionaries started actively preaching, and the introduction of sacred music became an integral part of their activities. The Orthodox mission introduced traditional choral music in Japan. The great impact in the choral music development was made by musicians such as conductors Iacob Tihai (served in the Orthodox mission from 1874 to 1886) and Dmytro Livovsky (served in the Orthodox mission from 1880 to 1921). They organized the first traditional choirs in Holy Resurrection Cathedral in Tokyo (known as Nikolai-do), taught music in Tokyo Theological Seminary, completed and published the first musical score collections, and educated the first Japanese choir conductors and music teachers. Among them are Roman Chiba, Alexey Obara, Innokentiy Kisu, Yakov Maedako, Petr Tokairin, Ioan Nakashima, Moisei Kawamura, Ioan Owata, Pavel Isiya, Vasiliy Takeda, Andrey Abe, Alexandr Komagai, Fedor Minato, Alexey Sawabe, Luka Orit. All of them became Orthodox Christians and adopted Christian names.
As the leader of the Cure Alzheimer's Fund's Alzheimer's Genome Project, Tanzi several other AD genes, most notably, CD33, reported in 2008 with Lars Bertram, in the American Journal of Human Genetics. In that study, Tanzi reported the first family-based genome-wide association study of AD, which most notably to the identification of the first innate immune microglial AD gene, CD33, which encodes a cell-surface receptor on monocytes and microglia. In 2013, Tanzi and Dr. Ana Griciuc first reported in Neuron that increased expression of CD33 in microglial cells in AD brain and showed that a protective CD33 gene variant was associated with reductions in CD33 expression and Abeta levels in AD brain. Importantly, they showed CD33 inhibits microglial phagocytosis and clearance of Abeta and induces pro-inflammatory cytokine release leading to neuroinflammation. They also elucidated the molecular mechanism by which sialic acid binds to CD33 to induce neuroinflammation. In a follow-up study published in Neuron in 2019, Tanzi and Griciuc compared the neuroinflammatory effects of the CD33 gene to another AD-associated innate immune gene, TREM2. Knockout of CD33 in AD mice attenuated amyloid-beta pathology and improved cognition while knockout of TREM2 led to opposite effects. They then showed that TREM2 functions downstream of CD33 and that crosstalk between CD33 and TREM2 involves the neuroinflammation-related IL-1beta/IL-1RN axis cluster.
== Further reading == D. R. Nässel (2002). "Neuropeptides in the nervous system of Drosophila and other insects: multiple roles as neuromodulators and neurohormones". Progress in Neurobiology. 68 (1): 1–84. doi:10.1016/S0301-0082(02)00057-6. PMID 12427481. S2CID 24447517.
== Environmental behavior == Simple substituted pyridines vary significantly in environmental fate characteristics, such as volatility, adsorption, and biodegradation. Dipicolinic acid is among the least volatile, least adsorbed by soil, and most rapidly degraded of the simple pyridines. A number of studies have confirmed dipicolinic acid is biodegradable in aerobic and anaerobic environments, which is consistent with the widespread occurrence of the compound in nature. With a high solubility (5g/liter) and limited sorption (estimated Koc = 1.86), utilization of dipicolinic acid as a growth substrate by microorganisms is not limited by bioavailability in nature.
== Causes == Heinz bodies are formed by damage to the hemoglobin component molecules, usually through oxidative damage by administered drugs, or from an inherited mutation (i.e. change of an internal amino acid residue). As a result, an electron from the hemoglobin is transferred to an oxygen molecule, which creates a reactive oxygen species (ROS) that can cause severe cell damage leading to premature cell lysis. Damaged cells are cleared by macrophages in the spleen, where the precipitate and damaged membrane are removed, leading to characteristic "bite cells". The denaturing process is irreversible and the continual elimination of damaged cells leads to Heinz body anemia. There are several pathways leading to the hemoglobin damage.
Sources: en.wikipedia.org
Be in the region of the binding energy curve where a fission chain reaction is possible (i.e., above radium) Have a high probability of fission on neutron capture Release more than one neutron on average per neutron capture. (Enough of them on each fission, to compensate for non-fissions and absorptions in non-fuel material) Have a reasonably long half-life Be available in suitable quantities.
Calcium ions are one type of second messengers and are responsible for many important physiological functions including muscle contraction, fertilization, and neurotransmitter release. The ions are normally bound or stored in intracellular components (such as the endoplasmic reticulum(ER)) and can be released during signal transduction. The enzyme phospholipase C produces diacylglycerol and inositol trisphosphate, which increases calcium ion permeability into the membrane. Active G-protein open up calcium channels to let calcium ions enter the plasma membrane. The other product of phospholipase C, diacylglycerol, activates protein kinase C, which assists in the activation of cAMP (another second messenger).
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Sources: en.wikipedia.org
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.
Epitalon and epithalon both circulate, and the difference reflects transliteration of a name coined in Russian-language publications. Reference to the extract it derives from, epithalamin, explains the shared stem. Databases and suppliers are inconsistent, so a search for one spelling alone may miss relevant entries.
No. Epithalamin is a multi-component preparation obtained from pineal tissue, and its exact composition is not fully characterised. Epitalon is a single defined tetrapeptide described as a short synthetic counterpart of that extract, so the two are related in origin but not interchangeable in identity.
The dry powder is typically held at -20 degrees Celsius or lower, protected from light and moisture. Allowing a sealed vial to reach room temperature before opening reduces condensation on its contents. Conditions stated on a supplier certificate of analysis take precedence over general guidance.