If you have been reading about epithalamin 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 2025-11-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
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 compound is generally presented as a synthetic fragment of epithalamin, a pineal gland extract investigated in the former Soviet Union from the 1970s onward. Vladimir Khavinson and colleagues in Saint Petersburg developed short peptides modelled on such extracts, and epitalon became the most widely cited of those sequences. Most primary reports appeared in Russian-language journals or in proceedings with limited international circulation. Independent replication in laboratories outside that network remains sparse, and much repeated secondary material traces back to a small number of originating groups.
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.
Dissolution is usually performed in water or a suitable aqueous buffer, and the resulting liquid is divided into single-use portions before freezing. Freeze-thaw cycling is a recognised source of loss for short peptides, since each cycle can encourage aggregation or adsorption onto container walls. Working solutions are generally kept cold and used within a short window, although published stability data specific to epitalon are thin. Containers should be marked with concentration and date, and solutions examined for cloudiness before use.
Identity is normally established by reversed-phase high-performance liquid chromatography combined with mass spectrometry, a pairing that separates components and confirms molecular mass at once. Purity is quoted as a percentage from the chromatogram, and figures above ninety-five percent are a frequent commercial specification. Amino acid analysis or sequencing supplies further confirmation when required. Because many short peptides behave similarly under chromatography, retention time alone does not establish sequence; the mass measurement is what separates one tetrapeptide from another, and certificates should report both.
Short peptides such as AEDG are normally supplied as a freeze-dried solid and are kept dry, cold, and shielded from light. Holding at minus twenty degrees Celsius is common for the long term, while a refrigerator suffices for brief periods before use. The material takes up moisture to some degree, so containers should stay sealed and be allowed to reach room temperature before opening, which limits condensation on the contents. Repeated warming and cooling of a single container is discouraged because it admits water and can lower the amount of intact peptide.
| 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 |
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
Lyophilised epitalon is generally held at minus twenty degrees Celsius in a sealed container kept dry and dark. Cooler conditions are sometimes recommended for long-term archives. The solid takes up moisture readily enough that repeated opening of a vial introduces water, so dividing a batch into smaller portions before storage lowers degradation risk. Aqueous solutions are less durable than the dry powder and are usually prepared shortly before use, then kept cold and shielded from light to slow hydrolysis and oxidation.
Verification of research-grade material involves comparing a supplier chromatogram against an in-house reference, checking the observed mass against the calculated value, and where possible confirming residue order by tandem mass spectrometry or enzymatic peptide mapping. Purity claims should be read alongside the method used to obtain them, because detection wavelength and integration settings alter the result. Batch-specific data, rather than a generic grade statement, is the informative part of a certificate.
In 2009, Lilly pleaded guilty for illegally marketing antipsychotic medication Zyprexa and agreed to pay a $1.415 billion penalty that included a criminal fine of $515 million, the largest ever in a healthcare case and the largest criminal fine for an individual corporation ever imposed in a US criminal prosecution of any kind at the time. Eli Lilly has faced many lawsuits from people who claimed they developed diabetes or other diseases after taking olanzapine (branded Zyprexa), an antipsychotic medication, as well as by various governmental entities, insurance companies, and others. Internal documents provided to The New York Times revealed that Lilly had downplayed the risks of Zyprexa. According to the documents, 16 percent of people taking Zyprexa gained more than 66 pounds in their first year, a much larger figure than Eli Lilly had shared with doctors. In 2006, Lilly paid $700 million to settle around 8,000 of these lawsuits, and in early 2007, Lilly settled around 18,000 suits for $500 million, which brought the total Lilly had paid to settle suits related to the drug to $1.2 billion. In March 2008, Lilly settled a suit with the state of Alaska, and in October 2008, Lilly agreed to pay $62 million to 32 states and the District of Columbia to settle suits brought under state consumer protection laws. In 2009, four sales representatives for Eli Lilly filed separate qui tam lawsuits against the company for illegally marketing Zyprexa for uses not approved by the Food and Drug Administration.
These are drugs whose primary effects are thought to be mediated by different neurotransmitter systems (dopamine for stimulants, serotonin for antidepressants), but many also increase levels of norepinephrine in the brain. Amphetamine, for example, is a stimulant that increases release of norepinephrine as well as dopamine. Monoamine oxidase A inhibitors (MAO-A) are antidepressants that inhibit the metabolic degradation of norepinephrine as well as serotonin and dopamine. In some cases it is difficult to distinguish the norepinephrine-mediated effects from the effects related to other neurotransmitters.
=== Venezuela === Early on 3 September, tributes containing photos, videos and names of the deceased began to appear on social media. There was no response from the Maduro administration for four hours after the strike was announced; Freddy Ñáñez, the Venezuelan communications minister, was the first Venezuelan official to address the strike. He stated that the footage of the attack was fake. Inhabitants of San Juan de Unare disagree with this version. During his regular TV show on 3 September, Diosdado Cabello, Venezuela's Minister of Interior, Justice and Peace, characterized the strike as "fake news" "invented" by the US as a cover for regime change. In the TV segment, he called the killings extrajudicial murders. Cabello later said that Venezuelan investigations determined none of the 11 people killed were members of Tren de Aragua. A neighbor of one of the missing people disagreed with this version. The next day, on 4 September, Attorney General Tarek William Saab said the attack never occurred. Maduro accused the US of threatening regime change with the strike and build up of naval forces in the area. He said there were no criminal connections to drug traffickers. Delcy Rodríguez, the vice president of Venezuela, asked on 8 September, "How can there be a drug cartel if there's no drugs here?" In November 2025, Yván Gil, Venezuela's foreign minister, issued a statement saying that "Venezuela categorically, firmly, and absolutely rejects the new and ridiculous fabrication by the Secretary of the U.S.
== Self-replication == "Molecular assemblers" have been confused with self-replicating machines. To produce a practical quantity of a desired product, the nanoscale size of a typical science fiction universal molecular assembler requires an extremely large number of such devices. However, a single such theoretical molecular assembler might be programmed to self-replicate, constructing many copies of itself. This would allow an exponential rate of production. Then, after sufficient quantities of the molecular assemblers were available, they would then be re-programmed for production of the desired product. However, if self-replication of molecular assemblers were not restrained then it might lead to competition with naturally occurring organisms. This has been called ecophagy or the grey goo problem. One method of building molecular assemblers is to mimic evolutionary processes employed by biological systems. Biological evolution proceeds by random variation combined with culling of the less-successful variants and reproduction of the more-successful variants. Production of complex molecular assemblers might be evolved from simpler systems since "A complex system that works is invariably found to have evolved from a simple system that worked. . . . A complex system designed from scratch never works and can not be patched up to make it work. You have to start over, beginning with a system that works." However, most published safety guidelines include "recommendations against developing ... replicator designs which permit surviving mutation or undergoing evolution".
Sources: en.wikipedia.org
The most common side effects reported with vortioxetine are nausea, vomiting, constipation, and sexual dysfunction, among others. With the exceptions of nausea and sexual dysfunction, these side effects were reported by less than or equal to 10% of study participants given vortioxetine. Significant percentages of placebo-treated participants also report these side effects. Discontinuation of treatment due to adverse effects in clinical trials was 8% with vortioxetine versus 3% with placebo. Sexual dysfunction, such as decreased libido, abnormal orgasm, delayed ejaculation, and erectile dysfunction, are well-known side effects of SSRIs and serotonin–norepinephrine reuptake inhibitors (SNRIs). In clinical trials, sexual dysfunction occurred more often with vortioxetine than with placebo and appeared to be dose-dependent. Incidence of treatment-emergent sexual dysfunction as measured with the Arizona Sexual Experience Scale (ASEX) were 14 to 20% for placebo and 16 to 34% for vortioxetine over a dosage range of 5 to 20 mg/day. The incidence of sexual dysfunction with vortioxetine was similar to that with the SNRI duloxetine, which had an incidence of 26 to 28% at the used dosage of 60 mg/day. However, treatment-emergent sexual dysfunction caused by a prior SSRI was better improved by switching to vortioxetine than by switching to the SSRI escitalopram. In another study, vortioxetine at a dosage of 10 mg/day though not at 20 mg/day produced less sexual dysfunction than the SSRI paroxetine.
Pauses a rule issued under the Biden administration to cancel student loans if schools engaged in deceptive recruiting; Caps unsubsidized student loans for graduate students at $20,500 per year and $100,000 lifetime; Caps student loans for students seeking professional degrees, such as medical school or law school, at $50,000 per year and $200,000 lifetime, and eliminates graduate PLUS loans; Establishes a lifetime student loan borrowing limit of $257,000; Restructures income-based repayment programs; and Expands Pell Grants to cover workforce-training programs.
His observations culminated in the Political Essay on the Island of Cuba, a comprehensive geographic study examining the island’s physical and economic conditions, as well as the social realities of slavery. Published in 1828, the work was notable for its data and its condemnation of slavery, resonating during the Latin American independence movements. If the legislation of the Antilles and the condition of the colored population does not experience some salutary change, and if discussion without action is continued, the political power may well pass into the hands of that class which holds the might of labor, the will to throw off the yoke Humboldt also analyzed demographic data. In Cumana, he had recorded 6,000 people of color among 110,000 white and Creole residents. In Havana, government archives revealed that more than 2,130,000 Africans had been forcibly transported to British Caribbean territories over the previous century. In 1806, the slave trade involved 53,000 sales in British dominions and 15,000 in the United States. Humboldt estimated that from 1670 to 1825, nearly five million Africans were brought to the West Indies, not counting deaths during the Middle Passage. He was deeply affected by the realities of slavery, expressing indignation and advocating for strict enforcement of anti-slavery laws. He hoped that anti-slavery principles would spread southward in the Americas. The journey through Cuba was shortened when Humboldt received news of Captain Baudin’s French scientific expedition, expected on the Peruvian coast within a year.
=== Khartoum massacre === In early June 2019, following al-Burhan's and Hemedti's visits to the Egyptian, UAE and Saudi leaders, the Sudanese Security Forces and Rapid Support Forces, including Janjaweed militias, led by al-Burhan and his deputy cracked down on peaceful protests in Sudan, starting with the 3 June Khartoum massacre. Human rights groups said that peaceful protesters were killed and about forty of the bodies were thrown in the river Nile, hundreds were tortured, violated and raped in the streets of Khartoum. Al-Burhan's talks with the opposition on forming a combined government were then cancelled. During the days that followed, the TMC arrested several of the opposition leaders. Iyad el-Baghdadi interpreted the decision-making by the TMC under al-Burhan's leadership as being strongly influenced by the general context of the Saudi, UAE and Egyptian leaders being afraid of democratic movements. Mahmoud Elmutasim, a political activist and doctor who graduated from the University of Khartoum, similarly stated that Saudi Arabia and the UAE are opposed to the existence of democracies in the Middle East, since if "the idea of democracy itself [should] ever take root, or become widespread in the Middle East," then it would constitute a threat to the governmental systems of Saudi Arabia and the UAE.
== Function == MECP2 protein is found in all cells in the body, including the brain, acting as a transcriptional repressor and activator, depending on the context. However, the idea that MECP2 functions as an activator is relatively new and remains controversial. In the brain, it is found in high concentrations in neurons and is associated with maturation of the central nervous system (CNS) and in forming synaptic contacts.
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.
Reversed-phase high-performance liquid chromatography is run alongside mass spectrometry. The chromatogram separates components and gives a purity figure, while the mass spectrum confirms that the measured molecular mass matches the expected sequence. Neither measurement on its own is treated as sufficient.