Epithalamin comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-07-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 |
|---|---|---|
| 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 |
The proposed relationship between epitalon and pineal function is a central part of its background. Khavinson's group reported that short peptides corresponding to regions of larger pineal proteins could influence gene expression in cells. Epitalon was framed as a synthetic analogue of an active fragment rather than a direct isolation product. Whether the tetrapeptide reproduces the effects of the parent extract is an open question, because comparative studies are limited and the parent extract itself is not a single defined substance.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
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.
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.
Under the leadership of Alcide De Gasperi the Italian Christian Democrats defeated the powerful Communist–Socialist alliance in the elections of 1948, with covert support from the United States. Outside of Europe, the United States also began to express interest in the development of many other countries, so that they would not fall under the sway of Eastern Bloc communism. In his January 1949 inaugural address, Truman declared for the first time in US history that international development would be a key part of US foreign policy. The resulting program later became known as the Point Four Program because it was the fourth point raised in his address.
Recent research shows promising results in mortality and morbidity reductions when a state integrates drug monitoring programs with health information technologies and shares data through a centralized platform. The Substance Use-Disorder Prevention that Promotes Opioid Recovery and Treatment for Patients and Communities Act or the SUPPORT for Patients and Communities Act was introduced by the US House of Representatives on June 22, 2018, and was advanced on June 22, 2018. The bill includes Medicare and Medicaid reform in order to improve treatment, recovery, and prevention efforts while also strengthening the fight against synthetic drugs like fentanyl. In September 2018, the US Senate approved the SUPPORT for Patients and Communities Act (H.R. 6). The committee reached a final agreement on terms of the bill on September 25, 2018. The final agreement included provisions from multiple other acts, such as The Opioid Crisis Response Act of 2018, The Helping to End Addiction and Lessen (HEAL) Substance Use Disorders Act of 2018, and the Synthetics Trafficking and Overdose Prevention (STOP) Act of 2018. The House and The Senate passed the final draft on September 28 and October 3, respectively. President Donald Trump signed the package into law on October 28, 2018. In July 2019, English multinational consumer goods corporation Reckitt Benckiser, parent of US pharmaceutical company Indivior, agreed to pay $1.4 billion to the U.S.
The first organ ever induced and made in the lab was the bladder, which was created in 1999. By 2014, there had been various tissues regenerated by the 3D printer and these tissues included: muscle, vagina, penis and the thymus. In 2014, a conceptual human lung was first bioengineered in the lab. In 2015, the lab robustly tested its technique and regenerated a pig lung. The pig lung was then successfully transplanted into a pig without the use of immunosuppressive drugs. In 2015, researchers developed a proof of principle biolimb inside a laboratory; they also estimated that it would be at least a decade for any testing of limbs in humans. The limb demonstrated fully functioning skin, muscles, blood vessels and bones. In April 2019, researchers 3D printed a human heart. The prototype heart was made by human stem cells but only to the size of a rabbit's heart. In 2019, the researchers hoped to one day place a scaled up version of the heart inside humans.
== See also == Indian Institute of Remote Sensing Intel Research Lablets Remote sensing in mobile telecommunications NODE platform Quality control system (QCS) for web and papers SWARM Wireless sensor network nodes
==== Vertebrates ==== For the wood frog (Rana sylvatica), in the winter, as much as 45% of its body may freeze and turn to ice. "Ice crystals form beneath the skin and become interspersed among the body's skeletal muscles. During the freeze, the frog's breathing, blood flow, and heartbeat cease. Freezing is made possible by specialized proteins and glucose, which prevent intracellular freezing and dehydration." The wood frog can survive up to 11 days frozen at -4 °C. Other vertebrates that survive at body temperatures below 0 °C include painted turtles (Chrysemys picta), gray tree frogs (Hyla versicolor), moor frogs (Rana arvalis), box turtles (Terrapene carolina - 48 hours at -2 °C), spring peeper (Pseudacris crucifer), garter snakes (Thamnophis sirtalis- 24 hours at -1.5 °C), the chorus frog (Pseudacris triseriata), Siberian salamander (Salamandrella keyserlingii - 24 hours at -15.3 °C), European common lizard (Lacerta vivipara) and Antarctic fish such as Pagothenia borchgrevinki. Antifreeze proteins cloned from such fish have been used to confer frost-resistance on transgenic plants. Hibernating Arctic ground squirrels may have abdominal temperatures as low as −2.9 °C (26.8 °F), maintaining subzero abdominal temperatures for more than three weeks at a time, although the temperatures at the head and neck remain at 0 °C or above.
Sources: en.wikipedia.org
== NatB phenotypes == Studying the effect of mutations in the NAA20 gene and the NAA25 gene in human cells have shown similar cellular phenotypes, among others that downregulating NatB activity reduce the cytoskeleton stability by affecting the actin microfilaments and focal adhesion. By knocking out either the NAA20 or NAA25 gene, the same was observed in human cells as in yeast cells; reduction of actin microfibrils, as well as reduction of focal adhesions in the cell. The findings in this study also indicated that human NatB is more likely to acetylate MQ- protein N-termini at a higher rate than yeast NatB. Meaning that NatB is important for maintaining the structure and movement of the cell. NatB might also be linked to proteins involved in cellular growth, as knockdown of both NAA20 and NAA25 resulted in a decrease in cell proliferation. Knocking down either NAA20 or NAA25 however resulted in decrease in cell proliferation, more cell death or cells locked in the interphase stage (G0/G1), respectively. NatB has also been studied in mouse embryonic fibroblasts (MEFs) cells by knocking out the NAA20 gene, and as in human and yeast, cell proliferation decreased, as well as actin cytoskeleton and disorganization of and decrease in focal adhesion. DNA replication was also negatively affected, probably causing senescence in the cells.
== Applications == Affibody molecules can be used for protein purification, enzyme inhibition, research reagents for protein capture and detection, diagnostic imaging and targeted therapy. The second generation of Affibody molecule, ABY-025, binds selectively to HER2 receptors with picomolar affinity. These Affibody molecules are in clinical development for tumor diagnosis. Anti-HER2 Affibody molecule, fused with albumin binding domain (ABD), denoted as ABY-027, labeled with Lutetium-177 provided reduction of renal and hepatic uptake of radioactivity in mice xenografts.. Further preclinical research evaluated an optimised version of the same ABD-fused Affibody, reporting an improved therapeutic effect in combination with trastuzumab. In October 2025, a refined variant of the ABD-fused Affibody molecule targeting HER2, radiolabelled with Lutetium-177, entered clinical trials to assess its safety, biodistribution and tolerability in patients with metastatic breast cancer. Recently, anti-ZEGFR Affibody ZEGFR:2377 labeled with technetium-99m was successfully used to visualize ZEGR expressing tumor in mice xenograft also.
In addition to power and ground, these provide connections for data-in, data-out, clock and sometimes a strobe signal. These are connected in a daisy chain, which allows individual LEDs in a long LED strip light to be easily controlled by a microcontroller. Data sent to the first LED of the chain can control the brightness and color of each LED independently of the others. They are used where a combination of maximum control and minimum visible electronics are needed such as strings for Christmas and LED matrices. Some even have refresh rates in the kHz range, allowing for basic video applications. These devices are known by their part number (WS2812 being common) or a brand name such as NeoPixel. Filament An LED filament consists of multiple LED chips connected in series on a common longitudinal substrate that forms a thin rod reminiscent of a traditional incandescent filament. These are being used as a low-cost decorative alternative for traditional light bulbs that are being phased out in many countries. The filaments use a rather high voltage, allowing them to work efficiently with mains voltages. Often a simple rectifier and capacitive current limiting are employed to create a low-cost replacement for a traditional light bulb without the complexity of the low voltage, high current converter that single die LEDs need. Usually, they are packaged in bulb similar to the lamps they were designed to replace, and filled with inert gas at slightly lower than ambient pressure to remove heat efficiently and prevent corrosion.
Complement component 1s (EC 3.4.21.42, C1 esterase, activated complement C1s, complement C overbar 1r, C1s) is a protein involved in the complement system. C1s is part of the C1 complex. In humans, it is encoded by the C1S gene. C1s cleaves C4 and C2, which eventually leads to the production of the classical pathway C3-convertase.
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 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.