AEDG raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-01-31 and is reviewed periodically as new material appears.
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.
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.
Animal and clinical reports appear mainly in Russian-language journals from the 1990s and 2000s, covering endpoints such as melatonin rhythm, lifespan in aged rodents, and retinal function. Many of these papers involve small groups, lack blinding or placebo comparison, and are difficult to retrieve through indexed databases. Review articles published in English generally summarise the claims without reanalysing the underlying data. Because no large randomised trial exists, the clinical importance of these reported effects stays unresolved and is properly described as an open question.
No national medicines regulator has approved epitalon as a therapeutic product. It is generally distributed as a research chemical, and in some jurisdictions selling peptides for human consumption without approval is restricted or prohibited. Certificates of analysis accompanying commercial material vary in which tests are performed, and independent verification of identity and purity is uncommon. Statements about anti-ageing or disease-prevention benefits on vendor pages are marketing claims rather than regulatory findings, a distinction that shapes how the compound is discussed in scientific and popular sources alike.
The most frequently cited laboratory finding is that AEDG increased telomerase activity and extended telomere length in cultured human somatic cells. That work used fetal fibroblast strains and reported changes in enzyme activity alongside altered division counts. Replication by unrelated groups has been limited, and the published record is largely a single-laboratory series rather than a multi-centre programme. The result supports a hypothesis about peptide influence on gene expression in cell culture; it does not by itself establish an effect on telomere length in living animals or in people.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Synthetic tetrapeptide, four residues |
| Nominal mass | Approximately 390 Da | Free peptide; salt forms differ |
| Appearance | White to off-white powder | Commonly supplied lyophilised |
| Solubility class | Freely soluble in water | Also dissolves in aqueous buffer |
| Typical storage | −20 °C, desiccated | Cold packs used during transport |
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 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.
Reversed-phase high-performance liquid chromatography is the standard approach for assessing purity, usually with ultraviolet detection near 214 nm, where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the molecular mass and helps reveal truncation or deletion byproducts. Amino acid analysis can verify composition, and counterion content is sometimes measured because peptides purified with trifluoroacetic acid retain variable amounts of that salt. Purity figures reported without a stated method and detection wavelength are difficult to interpret.
Material sold for research use varies widely in documented quality. A useful verification package includes a certificate of analysis that states peptide content rather than only net weight, the chromatographic method and column used, and a mass spectrum consistent with the expected mass. Independent testing by a third-party laboratory is occasionally reported. Statements of identity resting only on a supplier label provide little assurance, and the gap between nominal mass and actual peptide content can be substantial once counterions and residual water are counted.
Architecture of the nucleus – Interaction of actin with alpha II-spectrin and other proteins are important for maintaining proper shape of the nucleus. Transcription – Actin is involved in chromatin reorganization, transcription initiation and interaction with the transcription complex. Actin takes part in the regulation of chromatin structure, interacting with RNA polymerase I, II and III. In Pol I transcription, actin and myosin (MYO1C, which binds DNA) act as a molecular motor. For Pol II transcription, β-actin is needed for the formation of the preinitiation complex. Pol III contains β-actin as a subunit. Actin can also be a component of chromatin remodelling complexes as well as pre-mRNP particles (that is, precursor messenger RNA bundled in proteins), and is involved in nuclear export of RNAs and proteins. Regulation of gene activity – Actin binds to the regulatory regions of different kinds of genes. Actin's ability to regulate gene activity is used in the molecular reprogramming method, which allows differentiated cells return to their embryonic state. Translocation of the activated chromosome fragment from under membrane region to euchromatin where transcription starts. This movement requires the interaction of actin and myosin. Integration of different cellular compartments. Actin is a molecule that integrates cytoplasmic and nuclear signal transduction pathways. An example is the activation of transcription in response to serum stimulation of cells in vitro.
==== Carcinogenesis and mutagenesis ==== In people receiving immunosuppressants to reduce transplant graft rejection, an increased risk of malignancy (cancer) is a recognised complication. The most common cancers are non-Hodgkin's lymphoma and skin cancers. The risk appears to be related to the intensity and duration of treatment.
=== 1979 === January 1: The United States and China normalize diplomatic relations. January 7: Vietnam deposes the Khmer Rouge and installs a pro-Vietnam, pro-Soviet government known as the People's Republic of Kampuchea. January 16: The Iranian Revolution ousts the pro-Western Shah, Mohammed Reza Pahlavi, and installs a theocracy under Grand Ayatollah Ruhollah Khomeini. The Central Treaty Organization dissolves as a result. February 17: Sino-Vietnamese War, China launches a punitive attack on Vietnam to punish it for invading Cambodia February 22: Saint Lucia becomes independent from the UK. February 24: A war broke out between Yemen Arab Republic and South Yemen. May 4: Margaret Thatcher is elected Prime Minister of the United Kingdom, becoming the first female to lead a major Western democracy. May 9: Civil war breaks out in El Salvador between Marxist-led insurgents and the U.S.-backed government. June 2: Pope John Paul II begins his first pastoral visit to his native Poland. June 18: U.S. President Jimmy Carter and Soviet leader Leonid Brezhnev sign the SALT II agreement, outlining limitations and guidelines for nuclear weapons. July 3: President Carter signs the first directive for financial aid to opponents of the pro-Soviet regime in Kabul, Afghanistan. July 16: Saddam Hussein becomes President of Iraq after Ahmed Hassan al-Bakr steps down. July 17: Marxist-led Sandinista revolutionaries overthrow the U.S.-backed Somoza dictatorship in Nicaragua. The Contra insurgency begins shortly thereafter.
== Etymology == The origin of the gly- and glu- prefixes for glycols and sugars is from Ancient Greek γλυκύς glukus which means sweet. Glycérine was coined c. 1811 by Michel Eugène Chevreul to denote what was previously called "sweet principle of fat" by its discoverer Carl Wilhelm Scheele. Chevreul's term was borrowed into English c. 1838, and during the 20th century it was displaced by an 1872 term glycerol that incorporates the -ol suffix common to alcohols.
Sources: en.wikipedia.org
Cannabis had been decriminalised by the Prayut government in 2022, with the move being most supported by the Bhumjaithai Party (BJT) as one of its flagship policies. The Pheu Thai party had run in 2023 on an anti-drug policy and opposed the use of cannabis except for medical use and, under Srettha, had proposed legislation aimed at restricting the use of cannabis. The party's stance on cannabis thus led to tension with the BJT – creating a rift between the two parties which remained in a coalition when Paetongtarn became prime minister. The Thai government had hoped that decriminalising cannabis would turn it into a cash crop. A lack of laws governing cannabis were blamed for the rise in illegal distribution and the creation of a saturated market. Shortly after becoming prime minister, the Ministry of Public Health proposed a new bill on 12 September 2024 restricting cannabis to medical and research reasons. It also proposed the establishment of a Cannabis Control Board (CCB) to regulate the industry. The bill did not pass and Paetongtarn pledged that the government would not reverse its policy on cannabis again. However, by 2025, tourists smuggling cannabis out from Thailand was on the rise. Somsak Thepsuthin, the Minister of Public Health, listed in May that Hong Kong, India, Pakistan and the United Kingdom were the main destinations. On 22 May, the Paetongtarn government announced it planned to introduce new restrictions limiting cannabis usage to individuals (including foreigners) with medical prescriptions from doctors.
== Early life == Margaret Ruth Kidder, one of five children, was born on October 17, 1948, in Yellowknife, Northwest Territories, the daughter of Jocelyn Mary "Jill" (née Wilson), a history teacher from British Columbia, and Kendall Kidder, an American explosives expert and engineer originally from New Mexico. She was of Welsh and English descent. Kidder was born in Yellowknife because of her father's employment, which required the family to live in remote locations. Her father subsequently served as the manager of the Yellowknife Telephone Company from 1948 to 1951. She had one sister, Annie, who is an actress and executive director of the People for Education charity, and three brothers: John, Michael, and Peter. Two of her siblings married notable Canadians: Annie married actor Eric Peterson and John married politician Elizabeth May. Kidder's niece Janet Kidder is also an actress. Recalling her childhood in northern Canada, Kidder said: "We didn't have movies in this little mining town. When I was 12, my mom took me to New York [City] and I saw Bye Bye Birdie, with people singing and dancing, and that was it. I knew I had to go far away. I was clueless, but I [have done] okay." In addition to Yellowknife, she also spent some time growing up in Labrador City, Newfoundland and Labrador. Kidder became interested in politics at a young age, which she credited to debates which her parents had over the dinner table; her mother had socialist leanings, while her father was a conservative Republican.
== History == The first ion funnel was created in 1997 in the Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory by the researchers in Richard D. Smith's lab. The ion funnel was implemented to replace the ion transmission-limited skimmer for more efficient ion capture in an ESI source. Many characteristics of the ion funnel are attributed to the stacked ring ion guide, however, the disks of an ion funnel vary in diameter down its long axis. There is a portion at the base of the ion funnel in which a series of cylindrical ring electrodes have decreasing diameters, which enables the ion cloud entering the ion funnel to be spatially dispersed. This allows for efficient transfer of the ion cloud through the conductance limiting orifice at the exit as the ion cloud becomes focused to a much smaller radial size. The DC electric field serves to push ions through the funnel. For positive ions, the front plate of the funnel has the most positive DC voltage, and subsequent plates have gradually decreasing DC components, providing added control. RF and DC electric fields are co-applied with a pseudopotential created with alternating RF polarities on adjacent electrodes. This “pseudo-potential” radially confines ions and causes instability in ions with a lower m/z (mass to charge ratio) while ions with a higher m/z are focused to the center of the funnel. The initial ion funnel design used in the Smith research lab proved inefficient for collecting ions with low m/z.
IGN appreciated Bloodlines' rewarding exploration outside the main story, and The New York Times and GameSpy praised its "wonderfully imaginative" missions. Reviewers noted that later parts of the game were disappointing, delivering repetitive combat-focused missions with regenerating enemies, abandoning dialogue and stealth and punishing players who build characters with more social skills than combat abilities. GameSpy said that it had never seen a role-playing game so affected by player actions with everything, from clan choice and character build to actions in missions, influencing future options and dialogue. Its writing was consistently praised by reviewers. The narrative was considered deep, successfully using White Wolf's Vampire: The Masquerade content. Eurogamer said that it had the best script the website had ever seen in a video game, and others described it as a superbly crafted tale of conspiracies, underworld subterfuge, fun and intrigue. Reviewers appreciated the use of adult themes, such as sex and death, in the storyline of a contemporary video game, which no other games had tackled with similar effectiveness. The mature themes succeeded without being gratuitous or exploitative, and were explored honestly and intelligently by a knowledgeable writer. The game's characters were praised for their memorable, developed personalities, with most major characters possessing their own backstory and presented as living people instead of ciphers.
=== Other illnesses === According to a 2020 meta-analysis of 48 clinical trials, Pioglitazone and Roux-en-Y gastric bypass surgery were the two most effective treatments for non-alcoholic steatohepatitis; the analysis' authors based this conclusion on improvements to the non-alcoholic fatty liver disease scores of trial participants. A 2021 meta-analysis of three clinical trials found that Pioglitazone had not been proven effective to treat Alzheimer's disease.
Sources: en.wikipedia.org
== Metabolism/Biotransformation == Quisqualic acid enters the body through different routes, such as ingestion, inhalation, or injection. The ADME (absorption, distribution, metabolism and excretion) process has been studied by means of various animal models in the laboratory. Absorption: quisqualic acid is a small and lipophilic molecule, thus is expected to be rapid. It is predicted to be absorbed in the human intestine and from then it circulates to the blood brain barrier. Analysis of amino acid transport systems is complex by the presence of multiple transporters with overlapping specificity. Since glutamate and quisqualic acid are similar, it is predicted that sodium/potassium transport in the gastrointestinal tract is the absorption site of the acid. Distribution: knowing the receptors it binds to, it can be readily predicted where the acid is present such as: hippocampus, basal ganglia, olfactory regions. Metabolism: quisqualic acid is thought to be metabolized in the liver by oxidative metabolism carried out by cytochrome P450 enzymes, Glutathione S-transferase (detoxifying agents). A study showed that the exposure to quisqualic acid revealed that P450, GST were involved. It is also confirmed by using admetSAR tool to evaluate chemical ADMET properties. Its metabolites are thought to be NMDA and quinolinic acid. Excretion: Mostly, as a rule of thumb, amino acids undergo transamination/deamination in the liver. Thus amino acids are converted into ammonia and keto acids, which are eventually excreted via the kidneys.
Most photosynthetic organisms are photoautotrophs, which means that they are able to synthesize food directly from carbon dioxide and water using energy from light. However, not all organisms use carbon dioxide as a source of carbon atoms to carry out photosynthesis; photoheterotrophs use organic compounds, rather than carbon dioxide, as a source of carbon. In plants, algae, and cyanobacteria, photosynthesis releases oxygen. This oxygenic photosynthesis is by far the most common type of photosynthesis used by living organisms. Some shade-loving plants (sciophytes) produce such low levels of oxygen during photosynthesis that they use all of it themselves instead of releasing it to the atmosphere. Although there are some differences between oxygenic photosynthesis in plants, algae, and cyanobacteria, the overall process is quite similar in these organisms. There are also many varieties of anoxygenic photosynthesis, used mostly by bacteria, which consume carbon dioxide but do not release oxygen or which produce elemental sulfur instead of molecular oxygen. Carbon dioxide is converted into sugars in a process called carbon fixation; photosynthesis captures energy from sunlight to convert carbon dioxide into carbohydrates. Carbon fixation is an endothermic redox reaction. In general outline, photosynthesis is the opposite of cellular respiration: while photosynthesis is a process of reduction of carbon dioxide to carbohydrates, cellular respiration is the oxidation of carbohydrates or other nutrients to carbon dioxide.
At the end of the 1896 season, Essendon, along with seven other clubs, formed the Victorian Football League. Essendon's first VFL game was in 1897 against Geelong at Corio Oval in Geelong. Essendon won its first VFL premiership by winning the 1897 VFL finals series in a round-robin event. Essendon again won the premiership in 1901, defeating Collingwood in the Grand Final. The club won successive premierships in 1911 and 1912 over Collingwood and South Melbourne, respectively.
One example at the tissue level showed the involvement of MC1R in the normal and pathological development of articular cartilage in the mouse knee. In this study the authors compared normal mice with mice completely lacking MC1R. Even without experimental induction of osteoarthritis, mice without MC1R had less articular cartilage (as shown by the red staining in the image). After experimental induction of osteoarthritis, the defect caused by MC1R was more pronounced.
In its open, inactive form, the active site structure forms a loop while one subunit adopts an asymmetric open conformation and the other adopts a quasi-open conformation. This conformation enables isocitrate to bind the active site, inducing a closed conformation that also activates IDH1. In its closed, inactive form, the active site structure becomes an α-helix that can chelate metal ions. An intermediate, semi-open form features this active site structure as a partially unraveled α-helix. There is also a type 1 peroxisomal targeting sequence at its C-terminal that targets the protein to the peroxisome.
Sources: en.wikipedia.org
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.
No endogenous peptide with this exact sequence has been described as a circulating hormone or signalling molecule. The tetrapeptide was designed as a synthetic analogue based on fragments observed in pineal preparations. Any activity discussed in the literature therefore refers to administered material rather than to a natural pool of the compound.
It is not an approved medicine in major jurisdictions and does not appear in the major pharmacopoeias. Material is usually distributed as a research chemical or laboratory reagent. Such labelling places handling responsibility on the purchaser and does not indicate that a regulatory body has reviewed the substance.
Small studies with human participants have been reported, chiefly in Russian-language journals, but they are limited in size and design. No large randomised controlled trial with published results is available.