A practical reference on epithalamin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-09-22. Anything still debated is marked as such rather than presented as settled.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
Reported biological findings come mainly from cell culture and rodent experiments. Those studies describe changes in telomerase catalytic subunit expression, melatonin rhythm amplitude, and antioxidant enzyme activity after peptide exposure. Human data are sparse and consist of small trials with limited blinding and inconsistent endpoints. The proposed mechanisms remain hypotheses rather than established facts, and there is no consensus on whether effects observed in animals carry over to people. Independent replication outside the original research groups is limited, which is a recognised gap in the published literature.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four amino acid residues |
| Residue sequence | Ala-Glu-Asp-Gly | Abbreviated AEDG |
| Approximate mass | 390.35 Da | Monoisotopic, free base form |
| Parent preparation | Epithalamin extract | Derived from pineal tissue |
| Common spelling variants | Epithalon, epithalone, AEDG | Affects literature retrieval |
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.
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.
The history of anorexia begins with descriptions of religious fasting dating from the Hellenistic era and continuing into the medieval period. The medieval practice of self-starvation by women, including some young women, in the name of religious piety and purity is sometimes referred to as anorexia mirabilis. The earliest medical descriptions of anorexic illnesses are generally credited to English physician Richard Morton in 1689. Etymologically, anorexia is a term of Greek origin: an- (ἀν-, prefix denoting negation) and orexis (ὄρεξις, "appetite"), translating literally to "a loss of appetite". In and of itself, this term does not have a harmful connotation, e.g., exercise-induced anorexia simply means that hunger is naturally suppressed during and after sufficiently intense exercise sessions. It is the adjective nervosa that indicates the functional and non-organic nature of the disorder, but this adjective is also often omitted when the context is clear. Despite the literal translation of anorexia, the feeling of hunger in anorexia nervosa is frequently present and the pathological control of this instinct is a source of satisfaction for the patients. The term "anorexia nervosa" was coined in 1873 by Sir William Gull, one of Queen Victoria's personal physicians. Gull published a seminal paper providing a number of detailed case descriptions of patients with anorexia nervosa. In the same year, French physician Ernest-Charles Lasègue similarly published details of a number of cases in a paper entitled De l'Anorexie hystérique.
To "save succeeding generations from the scourge of war, which twice.. brought untold sorrow to mankind", the United Nations Charter was passed in 1945, and the Bretton Woods Conference set up a new system of integrated World Banking, finance and trade. Also, the Council of Europe, formed by the Treaty of London 1949, adopted a European Convention on Human Rights, overseen by a new transnational court in Strasbourg in 1950. Already in 1946, Winston Churchill, who had been defeated as UK Prime Minister in 1945, had called for a "United States of Europe", though this did not mean the UK would sever its ties to the Commonwealth. In 1950, the French Foreign Minister Robert Schuman proposed that, beginning with integration of French and German coal and steel production, there should be "an organisation open to the participation of the other countries of Europe", where "solidarity in production" would make war "not merely unthinkable, but materially impossible". The 1951 Treaty of Paris created the first European Coal and Steel Community (ECSC), signed by France, West Germany, Belgium, the Netherlands, Luxembourg and Italy, with Jean Monnet as its president. Its theory was simply that war would be impossibly costly if ownership and production of every country's economy was mixed together. It established an Assembly (now the European Parliament) to represent the people, a Council of Ministers for the member states, a Commission as the executive, and a Court of Justice to interpret the law.
Various types of genital piercings can be inserted in the clitoris area. The clitoris piercing passes through the clitoral glans proper. However, performing this piercing depends heavily on anatomy and only a small percentage of people are anatomically suited for it (i.e., a sufficiently developed glans clitoridis is needed). The term "clit piercing" therefore often refers to the more common clitoral hood piercing. These are usually channeled in the form of vertical piercings, and, to a lesser extent, horizontal piercings. The triangle piercing is a very deep horizontal hood piercing and is done behind the clitoris as opposed to in front of it. For styles such as the Isabella piercing, which passes through the clitoral shaft but is placed deep at the base, they provide unique stimulation and still require the proper genital build. The Isabella starts between the clitoral glans and the urethra, exiting at the top of the clitoral hood; this piercing is highly risky concerning the damage that may occur because of intersecting nerves. (See Clitoral index.)
In this pathway, adenylate kinase combines two ADP molecules to make ATP and AMP; AMP is then deaminated, producing inosine monophosphate (IMP) and ammonia (NH3) as part of purine nucleotide cycle. Physicians may also check resting levels of creatine kinase, which are moderately increased in 90% of patients. In some, the level is increased by multitudes - a person without GSD-V will have a CK between 60 and 400IU/L, while a person with the syndrome may have a level of 5,000 IU/L at rest, and may increase to 35,000 IU/L or more with muscle exertion. This can help distinguish McArdle's syndrome from carnitine palmitoyltransferase II deficiency (CPT-II), a lipid-based metabolic disorder that prevents fatty acids from being transported into mitochondria for use as an energy source. Also, serum electrolytes and endocrine studies (such as thyroid function, parathyroid function, and growth hormone levels) will also be completed. Urine studies are required only if rhabdomyolysis is suspected. Urine volume, urine sediment, and myoglobin levels would be ascertained. If rhabdomyolysis is suspected, serum myoglobin, creatine kinase, lactate dehydrogenase, electrolytes, and renal function will be checked. Physicians may also conduct an exercise stress test to test for an inappropriately rapid heart rate (sinus tachycardia) in response to exercise. Due to the rare nature of the disease, the inappropriate rapid heart rate in response to exercise may be misdiagnosed as inappropriate sinus tachycardia (which is a diagnosis of exclusion).
Sources: en.wikipedia.org
The regeneration fibers must cross the injury site and regeneration through the proximal or retrograde area of degeneration may require several weeks. Then the neuritis tip progresses down the distal site, such as the wrist or hand. Proximal lesion may grow distally as fast as 2 to 3 mm per day and distal lesion as slowly as 1.5 mm per day. Regeneration occurs over weeks to years.
=== Subcellular localization === C3orf62 is predicted to be localized in the nucleus. The k-nearest neighbors algorithm predicts C3orf62 to be classified as follows: k=9/23; 69.6% nuclear, 13.0% mitochondrial, 13.0% cytoskeletal, 4.3% cytoplasmic.
The first step in the NADP-ME type C4 pathway is the conversion of pyruvate (Pyr) to phosphoenolpyruvate (PEP), by the enzyme Pyruvate phosphate dikinase (PPDK). This reaction requires inorganic phosphate and ATP plus pyruvate, producing PEP, AMP, and inorganic pyrophosphate (PPi). The next step is the carboxylation of PEP by the PEP carboxylase enzyme (PEPC) producing oxaloacetate. Both of these steps occur in the mesophyll cells: pyruvate + Pi + ATP → PEP + AMP + PPi PEP + CO2 → oxaloacetate PEPC has a low KM for HCO−3 — and, hence, high affinity, and is not confounded by O2 thus it will work even at low concentrations of CO2. The product is usually converted to malate (M), which diffuses to the bundle-sheath cells surrounding a nearby vein. Here, it is decarboxylated by the NADP-malic enzyme (NADP-ME) to produce CO2 and pyruvate. The CO2 is fixed by RuBisCo to produce phosphoglycerate (PGA) while the pyruvate is transported back to the mesophyll cell, together with about half of the phosphoglycerate (PGA). This PGA is chemically reduced in the mesophyll and diffuses back to the bundle sheath where it enters the conversion phase of the Calvin cycle. For each CO2 molecule exported to the bundle sheath the malate shuttle transfers two electrons, and therefore reduces the demand of reducing power in the bundle sheath.
Potassium-40 (40K) is a long lived and the main naturally occurring radioactive isotope of potassium, with a half-life of 1.248 billion years. It makes up about 117 ppmTooltip parts-per-million of natural potassium, making that mixture very weakly radioactive. The half-life is much shorter than the age of Earth, meaning this fraction was significantly larger earlier in Earth's history. Potassium-40 undergoes four different paths of radioactive decay, including all three main types of beta decay:
==== United Kingdom ==== Insulin, and all other medications, are supplied free of charge to people who use it to manage their diabetes by the National Health Services of the countries of the United Kingdom.
Sources: en.wikipedia.org
== Physical properties == In the solid state, racemic mixtures may have different physical properties from either of the pure enantiomers because of the differential intermolecular interactions (see Biological Significance section). The change from a pure enantiomer to a racemate can change its density, melting point, solubility, heat of fusion, refractive index, and its various spectra. Crystallization of a racemate can result in separate (+) and (−) forms, or a single racemic compound. However, in liquid and gaseous states, racemic mixtures will behave with physical properties that are identical, or near identical, to their pure enantiomers.
Not all wavelengths of light can support photosynthesis. The photosynthetic action spectrum depends on the type of accessory pigments present. For example, in green plants, the action spectrum resembles the absorption spectrum for chlorophylls and carotenoids with absorption peaks in violet-blue and red light. In red algae, the action spectrum is blue-green light, which allows these algae to use the blue end of the spectrum to grow in the deeper waters that filter out the longer wavelengths (red light) used by above-ground green plants. The non-absorbed part of the light spectrum is what gives photosynthetic organisms their color (e.g., green plants, red algae, purple bacteria) and is the least effective for photosynthesis in the respective organisms.
There was worse to follow, with various Essendon players publicly blaming each other for a poor performance against Richmond, and then, with dissension still rife in the ranks, the side plummeted to an unexpected and humiliating 28-point loss to VFA premiers Footscray in a special charity match played a week later in front of 46,100 people, in aid of Dame Nellie Melba's Limbless Soldiers' Appeal Fund, purportedly (but not officially) for the championship of Victoria. The club's fortunes dipped alarmingly—and persistently. Indeed, after finishing third in the 1926 season, it was to be 14 years later—in 1940—before Essendon would even contest another finals series.
A ligand-targeted liposome (LTL) is a nanocarrier with specific ligands attached to its surface to enhance localization for targeted drug delivery. The targeting ability of LTLs enhances cellular localization and uptake of these liposomes for therapeutic or diagnostic purposes. LTLs have the potential to enhance drug delivery by decreasing peripheral systemic toxicity, increasing in vivo drug stability, enhancing cellular uptake, and increasing efficiency for chemotherapeutics and other applications. Liposomes are beneficial in therapeutic manufacturing because of low batch-to-batch variability, easy synthesis, favorable scalability, and strong biocompatibility. Ligand-targeting technology enhances liposomes by adding targeting properties for directed drug delivery.
Vectorial synthesis is synthesis of exported proteins by ribosomes in which the ribosome-nascent chain complex is bound directly to the endoplasmic reticulum (ER) and the nascent peptide chain moves through the ER membrane as it emerges from the ribosome.
Sources: en.wikipedia.org
It is based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.
No. Epithalamin is a heterogeneous extract containing many peptides, while epitalon is a single synthesised tetrapeptide. Publications sometimes treat findings from the two as equivalent, which is a common source of confusion. Their compositions differ and they are not interchangeable in analytical terms.
Most published work uses cell cultures or rodents because those models are faster and less costly to run. The few human trials that have been reported are small, and several lack control groups or blinding. This restricts what can reasonably be concluded about effects in people.
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.