The short version of epitalon fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-10-08. Anything still debated is marked as such rather than presented as settled.
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.
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 published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
| 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 |
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
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.
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.
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.
== Kendrick mass == The Kendrick mass is a mass obtained by multiplying the measured mass by a numeric factor. The Kendrick mass is used to aid in the identification of molecules of similar chemical structure from peaks in mass spectra. The method of stating mass was suggested in 1963 by the chemist Edward Kendrick. According to the procedure outlined by Kendrick, the mass of CH2 is defined as 14.000 Da, instead of 14.01565 Da. The Kendrick mass for a family of compounds
==== Pharmacokinetics of urea derivatives ==== Regorafenib and sorafenib reach mean peak plasma level in about 3 or 4 hours after a single oral dose. A high-fat meal decreases their absorption, while a low-fat meal may increase it, in comparison to taking the drugs in a fasting condition. In vitro protein binding is 99,5% for both drugs. The drugs are mainly metabolized in the liver by oxidative metabolism of CYP3A4, and glucuronidized by UGT1A9. Their half-life ranges from 20 to 48 hours. Most of the administered dose should be out of the system in around 14 days. The drugs are mostly excreted in faeces, around 70-80%, but also in urine.
== Signs and symptoms == Binge eating is the core symptom of BED; however, not everyone who binge eats meets qualifications for BED. An individual may occasionally binge eat without experiencing many of the negative physical, psychological, or social effects of BED. This may be considered disordered eating rather than a clinical disorder. Precisely defining binge eating can be problematic; however, binge eating episodes in BED are generally described as having the following potential features:
The book presented her observations from more than 300 experiments over the span of five years, during which she attempted to discover factors necessary for the preservation of beef, eggs, and other foods. Her work was recommended for royal privilege by fellow chemist Pierre-Joseph Macquer. c. 1775: French explorer, herbalist and botanist Jeanne Baret becomes the first woman to circumnavigate the globe. c. 1775: French chemist, scientific artist and translator, Marie-Anne Paulze Lavoisier began working with her husband chemist Antoine Lavoisier. She was instrumental in the 1789 publication of her husband’s groundbreaking Elementary Treatise on Chemistry, which presented a unified view of chemistry as a field, as she drew diagrams of all the equipment used, and kept strict records that lent validity to the findings. She also translated and critiqued Richard Kirwan's 'Essay on Phlogiston and the Constitution of Acids' which led to the discovery of oxygen gas. 1776: At the University of Bologna, Italian physicist Laura Bassi became the first woman appointed as chair of physics at a university. 1776: German astronomer Christine Kirch received a respectable salary of 400 Thaler for calendar-making. See also her sister Margaretha Kirch 1782–1791: French chemist and mineralogist Claudine Picardet translated more than 800 pages of Swedish, German, English and Italian scientific papers into French, enabling French scientists to better discuss and utilize international research in chemistry, mineralogy and astronomy. c.
Evaporated milk is made from fresh, homogenised milk from which 60% of the water has been removed. After the water has been removed, the product is chilled, stabilised, sterilised and packaged. It is commercially sterilised at 240–245 °F (116–118 °C) for 15 minutes. A slightly caramelised flavor results from the high heat process (Maillard reaction), and it is slightly darker in colour than fresh milk. The evaporation process concentrates the nutrients and the food energy (kcal); unreconstituted evaporated milk contains more nutrients and calories than does fresh milk per unit volume.
Sources: en.wikipedia.org
=== Differential Diagnosis === While Kwashiorkor is primarily characterized by edema, growth failure, and dermatitis, it can sometimes be misdiagnosed as Acrodermatitis Enteropathica (AE), as both conditions present with similar dermatological symptoms. However, AE is caused by zinc deficiency, not protein deficiency, and is associated with a significant decrease in serum zinc levels. Unlike kwashiorkor, which is diagnosed based on clinical signs like edema and low serum albumin levels, AE requires additional diagnostic tests, such as zinc uptake tests and genetic screening, to differentiate it from other disorders with similar symptoms. Therefore, while both conditions can present with dermatitis, the underlying etiology helps distinguish the two.
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.
== Adverse effects == Adverse effects of teicoplanin are usually limited to local effects or hypersensitivity reactions. While there is potential for nephrotoxicity and ototoxicity, the incidence of such organ toxicity is rare if recommended serum concentrations are successfully maintained.
Isolated cataplexy unto itself (i.e., in the absence of characteristically associated narcolepsy), admittedly a rare condition There is anecdotal and tentative, as-yet-undocumented information suggesting that clomipramine may address certain core features of hyperacusis, and possibly misophonia. In the case of hyperacusis, this appears to be especially the case at doses > 150 mg/d. As-with obsessive-compulsive disorder, a full response to any one dose may not be experienced for up to 12–16 weeks. Although lithium is most-associated with the treatment of bipolar disorder (where it is known for its general mood-stabilising features and to be especially useful in treating and preventing mania), it may have a certain place in the management of treatment-resistant depression (which is often of higher severity than other depressions which have not been addressed with ECT). In these cases it is often prescribed alongside SSRIs (e.g., fluoxetine, paroxetine), venlafaxine and various of the tricyclics (e.g., clomipramine, amitriptyline, nortriptyline, maprotiline), which is why it may feature sometimes in the discussion of depression being managed with clomipramine. Lithium also significantly reduces the long-term risk of suicide in general. In any case, it is not necessary to have a diagnosis of bipolar affective disorder (manic-depressive illness), or even to be considered to have subtle elements of it ("soft bipolarity"), to benefit from lithium in the context of treatment with clomipramine.
Sources: en.wikipedia.org
The bills of the 117th United States Congress list includes proposed federal laws that were introduced in the 117th United States Congress. The United States Congress is the bicameral legislature of the federal government of the United States consisting of two houses: the lower house known as the House of Representatives and the upper house known as the Senate. The House and Senate are equal partners in the legislative process—legislation cannot be enacted without the consent of both chambers. Once a bill is approved by one house, it is sent to the other which may pass, reject, or amend it. For the bill to become law, both houses must agree to identical versions of the bill. After passage by both houses, a bill is enrolled and sent to the president for signature or veto. Bills from the 117th Congress that have successfully completed this process become public laws, listed as Acts of the 117th United States Congress.
In order to remove the thin and well preserved skin slices and strips from the donor, surgeons use a special surgical instrument called a dermatome. This usually produces a split-thickness skin graft, which contains the epidermis with only a portion of the dermis. The dermis left behind at the donor site contains hair follicles and sebaceous glands, both of which contain epidermal cells which gradually proliferate out to form a new layer of epidermis. The donor site may be extremely painful and vulnerable to infection. There are several ways to treat donor site pain. These include subcutaneous anesthetic agents, topical anesthetic agents, and certain types of wound dressings.
=== Structure === The MTRR gene is associated with a family of electron transferases known as the Ferredoxin-NADP(+) reductase (FNR) family. Found in 15 primates and over 16 tissues in humans, MTRR is 34 kb long. The gene comprises 15 exons and includes numerous cytolosic mitochondrial mRNA isoforms. Multiple cofactor binding sites assist in the maintenance of MTR activity via reductive remethylation. All binding domains involve selective and non-covalent interactions except the flavodoxin_1 domain.
In this method, the proteins migrate first into a collecting gel with neutral pH, in which they are concentrated and then they migrate into a separating gel with basic pH, in which the actual separation takes place. Stacking and separating gels differ by different pore size (4-6 % T and 10-20 % T), ionic strength and pH values (pH 6.8 or pH 8.8). The electrolyte most frequently used is an SDS-containing Tris-glycine-chloride buffer system. At neutral pH, glycine predominantly forms the zwitterionic form, at high pH the glycines lose positive charges and become predominantly anionic. In the collection gel, the smaller, negatively charged chloride ions migrate in front of the proteins (as leading ions) and the slightly larger, negatively and partially positively charged glycinate ions migrate behind the proteins (as initial trailing ions), whereas in the comparatively basic separating gel both ions migrate in front of the proteins. The pH gradient between the stacking and separation gel buffers leads to a stacking effect at the border of the stacking gel to the separation gel, since the glycinate partially loses its slowing positive charges as the pH increases and then, as the former trailing ion, overtakes the proteins and becomes a leading ion, which causes the bands of the different proteins (visible after a staining) to become narrower and sharper - the stacking effect. For the separation of smaller proteins and peptides, the TRIS-Tricine buffer system of Schägger and von Jagow is used due to the higher spread of the proteins in the range of 0.5 to 50 kDa.
Both the first and second dimensions of 2DE are adaptable and easily modified to enhance proteome coverage as necessary (e.g. to focus on specific pI ranges, or to best resolve lower or higher MW species). This flexibility and adaptability further complements the additional analytical capacity enabled by excision and third electrophoretic separations of primary gel regions, as well as the subsequent deep imaging of the primary gel to expand the dynamic range of detection to even very low abundance proteoforms. Generally straightforward data analysis. High quality iTDP analyses are fully enabled by established mid-range LC/MS systems; while advanced and/or specialized systems continue to drive throughput and/or sequence coverage, these are not essential to enabling iTDP analyses. Western blotting after 2DE can also be used to capitalize on the availability of high-quality antibodies. Indeed, this was one of the first approaches to identify multiple variants (i.e. proteoforms) of a given protein in the same sample. Criteria to ensure the highest quality (quantitative) western blots are well-established if not always widely followed. The primary focus of the iTDP approach is the comprehensiveness of analyses (i.e. depth) and thus data quality, rather than high throughput. "It is not the rate or volume of data generated but rather the quality that ultimately matters".
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.
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.