If you have been reading about pineal peptides and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-08-29. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 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.
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.
The four residues give epitalon a molecular formula of C14H22N4O9 and a molecular weight near 390.35 daltons. The presence of two acidic residues, glutamate and aspartate, makes the free peptide strongly acidic, while the alanine and glycine ends provide neutral, nonpolar character. This combination produces a molecule with substantial water solubility. Because there are no cysteine, methionine, or tryptophan residues, the peptide lacks the most common oxidation-sensitive side chains, which simplifies handling compared with many longer peptides.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four residues, linear chain |
| Residue sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Calculated mass | 390.3 daltons | Value for the free, uncharged form |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility | Freely soluble in water | Often handled as a salt form |
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.
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.
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.
== Development == Episode Two was the second in a planned trilogy of shorter episodic games that would continue the story of Half-Life 2 (2004). It was developed simultaneously with Episode One (2006) by a team led by David Speyrer. This schedule of simultaneous development aided them in streamlining the story between the two games to create an immersive story. The technology used was the same for both games, allowing the development teams to quickly fix any technical problems that might arise from either game; this happened often because of the multi-platform release. The team originally planned the ending to feature a comical sequence with Lamarr, Kleiner's pet headcrab, floating in space outside the rocket Gordon launches into space; however, Valve president Gabe Newell requested killing off a major character to create a cliffhanger for Episode Three. On July 13, 2006, Valve announced that Episode Two would be released on Xbox 360 and PlayStation 3 in addition to Windows. Valve handled the development for the PC and Xbox 360, while Electronic Arts (EA) worked on the PlayStation 3 version. It was announced on September 7, 2007, that the PlayStation 3 version would be delayed because the EA studio behind the game was in the United Kingdom, away from Valve's development team, and therefore lagged behind in its schedule. According to Valve's marketing director, Doug Lombardi, the Xbox 360, PlayStation 3 and Windows versions would be identical in functionality and performance. An audio commentary is also featured, as in Episode One and Lost Coast.
The 70 kilodalton heat shock proteins (Hsp70s or DnaK) are a family of conserved ubiquitously expressed heat shock proteins. Proteins with similar structure exist in virtually all living organisms and play crucial roles in the development of cancer, neurodegeneration, apoptosis, regulating sleep, and much more. Intracellularly localized Hsp70s are an important part of the cell's machinery for protein folding, performing chaperoning functions, and helping to protect cells from the adverse effects of physiological stresses. Additionally, membrane-bound Hsp70s have been identified as a potential target for cancer therapies and their extracellularly localized counterparts have been identified as having both membrane-bound and membrane-free structures. There is lot of potential in the Hsp70 protein as a key therapeutic target for developing new drugs for the treatment of sleep disorders, cancer, neurodegeneration, and other related pathological conditions.
Each subunit has a molecular weight of about 16,000 daltons, for a total molecular weight of the tetramer of about 64,000 daltons (64,458 g/mol). Thus, 1 g/dL=0.1551 mmol/L. Hemoglobin A is the most intensively studied of the hemoglobin molecules. In human infants, the fetal hemoglobin molecule is made up of 2 α chains and 2 γ chains. The γ chains are gradually replaced by β chains as the infant grows. The four polypeptide chains are bound to each other by salt bridges, hydrogen bonds, and the hydrophobic effect.
=== 547th Volksgrenadier Division === The 547th Volksgrenadier Division continued fighting under the 4th Army in Lithuania and, during the following month, retreated with the 4th Army to East Prussia, remaining there until January 1945. The unit was destroyed near Zinten in February 1945. The remnants of the division were distributed among other divisions. The infantry elements were transferred to the 170th Infantry Division.
ASBMB Avanti Award for Lipid Research (1998) Elected to the American Academy of Arts and Sciences (1999) Heinrich Wieland Prize for Lipid Research (2000) Elected to the National Academy of Sciences (2001) Caledonian Prize from the Royal Society of Edinburgh (2002) Pezcoller-AACR International Award for Cancer Research (2005) Rolf Luft Award of the Karolinska Institute (2009) Pasrow Prize for Cancer Research (2011) Breakthrough Prize in Life Sciences (2013) Jacobaeus Prize for Diabetes Research, from the Karolinska Institute (2013) Elected to the Institute of Medicine of the National Academies (2014) AACR Princess Takamatsu Memorial Lectureship (2015) Ross Prize in Molecular Medicine (2015) Canada Gairdner International Award (2015) Elected to European life sciences academy EMBO (2015) The Association of American Cancer Institutes Distinguished Scientist Award (2015) Thomson Reuter's "The World's Most Influential Scientific Minds 2015". The Wolf Prize in Medicine (2016) The Hope Funds Award of Excellence in Basic Science (2016) Louisa Gross Horwitz Prize (2019) He appeared in the 60 Minutes program "Is sugar toxic?".
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where v = 1/ρ is the specific volume of the fluid element. One can think of ∇ ∙ u as a measure of flow compressibility. Sometimes the negative sign is included in the term. The term 1/ρ2∇ρ × ∇p is the baroclinic term. It accounts for the changes in the vorticity due to the intersection of density and pressure surfaces. The term ∇ × (∇ ∙ τ/ρ) accounts for the diffusion of vorticity due to the viscous effects. The term ∇ × B provides for changes due to external body forces. These are forces that are spread over a three-dimensional region of the fluid, such as gravity or electromagnetic forces. (As opposed to forces that act only over a surface (like drag on a wall) or a line (like surface tension around a meniscus).
log(Ka) = log(K0a) + ρσ. Ka is the dissociation constant of a substituted compound, K0a is the dissociation constant when the substituent is hydrogen, ρ is a property of the unsubstituted compound and σ has a particular value for each substituent. A plot of log(Ka) against σ is a straight line with intercept log(K0a) and slope ρ. This is an example of a linear free energy relationship as log(Ka) is proportional to the standard free energy change. Hammett originally formulated the relationship with data from benzoic acid with different substituents in the ortho- and para- positions: some numerical values are in Hammett equation. This and other studies allowed substituents to be ordered according to their electron-withdrawing or electron-releasing power, and to distinguish between inductive and mesomeric effects. Alcohols do not normally behave as acids in water, but the presence of a double bond adjacent to the OH group can substantially decrease the pKa by the mechanism of keto–enol tautomerism. Ascorbic acid is an example of this effect. The diketone 2,4-pentanedione (acetylacetone) is also a weak acid because of the keto–enol equilibrium. In aromatic compounds, such as phenol, which have an OH substituent, conjugation with the aromatic ring as a whole greatly increases the stability of the deprotonated form.
=== Infections === Recent studies indicate that the chorionic villi may be susceptible to bacterial and viral infections. Recents findings indicate that ureaplasma parvum can infect the chorionic villi tissues of pregnant women, thereby impacting pregnancy outcome. DNA from JC polyomavirus and Merkel cell polyomavirus has been detected in chorionic villi from pregnant women and women affected by miscarriage. DNA from BK polyomavirus has also been detected in the same tissues but to a lesser extent.
Efforts are ongoing to find medications that either return the ability to make dystrophin or utrophin. Other efforts include trying to block the entry of calcium ions into muscle cells. Recent reports have revealed gut microbiome dysbiosis influencing muscle pathophysiology through the immune system of dystrophin‐deficient mice and managing of gut dysbiosis with sodium butyrate supplementation (NaB) in mdx mice is reported with rescuing muscle strength and halting inflammation. In human clinical studies, epigenetic manipulation as a potential mechanism through gut microbiome balancing yielding clinically encouraging outcome have been reported, warranting further in-depth evaluation in this direction.
Sources: en.wikipedia.org
== Epidemiology == Fibromyalgia is estimated to affect 1.8% of the population. German Federal Ministry of Health guidance is that about 2% of adults in Germany suffer from fibromyalgia. Information about FM prevalence in many parts of the world is limited by lack of information and by differing diagnosis standards. A 2024 study found more patients met fibromyalgia proxy criteria than were clinically diagnosed with fibromyalgia, implying that fibromyalgia is underdiagnosed. Historically, diagnosed FM cases have been between 4%-20% male. As a result historically most FM research has focused on women. There has been debate about whether men experience differences in FM symptoms compared to women. Men may be relatively underdiagnosed, perhaps because they interact with medical services over chronic pain less than women do. The genetic architecture of fibromyalgia is nearly identical between males and females.
In the BG system the pound is a basic unit from which the unit of mass (the slug) is defined by Newton's second law, whereas in the EE system the units of force and mass (the pound-force and pound-mass respectively) are defined independently through the second law using the proportionality constant gc. Kinematic viscosity has units of square feet per second (ft2/s) in both the BG and EE systems. Nonstandard units include the reyn (lbf·s/in2), a British unit of dynamic viscosity. In the automotive industry the viscosity index is used to describe the change of viscosity with temperature. The reciprocal of viscosity is fluidity, usually symbolized by
A polyamide is a polymer with repeating units linked by amide bonds. Polyamides occur both naturally and artificially. Examples of naturally occurring polyamides are proteins, such as wool and silk. Artificially made polyamides can be made through step-growth polymerization or solid-phase synthesis yielding materials such as nylons, aramids, and sodium polyaspartate. Synthetic polyamides are commonly used in textiles, automotive industry, carpets, kitchen utensils and sportswear due to their high durability and strength. The transportation manufacturing industry is the major consumer, accounting for 35% of polyamide (PA) consumption.
Registered voters: 125,090 valid: 104,941 turnout: 84% The West Prussian plebiscite area remained with Germany and became part of the new West Prussia Government Region, which was annexed to East Prussia in 1922.
== Research == A major focus of his research is analytical separations theory and its application. His research group develops analytical techniques for molecular recognition and molecularly selective microextractions, and utilizes “green” separation procedures using aqueous solutions and nonvolatile polymeric systems. They have developed thin films for solid-phase micro extraction (SPME). Weber develops electrochemical detectors for use with liquid chromatography techniques. An important area of application is the identification of peptides, which help to control the body. Some of the systems which neuropeptides influence include pain, mood, social and emotional behavior, responses to stress, and memory. Understanding how peptides affect neurochemistry and other biological systems has important implications for medicine and pharmaceutical development. Dipeptides can be present in the brain at sub-picomole levels. To work effectively at this level, techniques must be highly sensitive and selective. Weber and his colleagues work on techniques to sample minute quantities from brain fluid and from single living cells. They are developing specialized sampling protocols with the goal of obtaining minute amounts of material from living organisms with minimal damage.
Sources: en.wikipedia.org
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.
Epithalamin refers to a crude preparation derived from bovine pineal tissue, which contains many components. Epitalon is a single synthetic tetrapeptide identified from that material and produced by chemical synthesis. The two names are sometimes confused because early reports treated the synthetic peptide as an active fragment of the extract.
It has been registered for clinical use in Russia, where it is associated with a small family of short peptides. In most other jurisdictions it is not an approved medicine and is traded as a research chemical. Regulatory status varies by country and changes over time.
Epitalon is a synthetic tetrapeptide composed of four amino acids: alanine, glutamate, aspartate, and glycine. It is written as Ala-Glu-Asp-Gly. The free peptide has a molecular weight of about 390 daltons and is normally supplied as a lyophilized powder.