AEDG peptide raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-04-25. Anything still debated is marked as such rather than presented as settled.
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.
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 appears in the literature primarily through a small number of research groups, most of them associated with the St. Petersburg Institute of Bioregulation and Gerontology. Publications describe cell culture experiments, animal studies, and a limited number of small human studies. Independent replication outside this network is sparse. As a result, reviews of the topic usually separate descriptive reports of observed effects from the question of whether those effects generalize, and they note the difficulty of comparing studies that use different preparations and endpoints.
Analytical characterization of epitalon relies on standard peptide methods. Reverse-phase high-performance liquid chromatography is used to assess purity, and mass spectrometry confirms identity by checking the observed mass against the expected value near 390 daltons. Amino acid analysis can verify composition. Because the peptide is short and hydrophilic, it elutes early on many reverse-phase columns, so method development often requires ion-pairing reagents to achieve adequate retention and resolution from related impurities.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
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.
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.
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.
== See also == Alleged Libyan financing in the 2007 French presidential election Disarmament of Libya Egyptian–Libyan War History of Libya under Muammar Gaddafi HIV trial in Libya Libya and weapons of mass destruction List of heads of state and government deposed by foreign powers in the 20th and 21st century List of heads of state and government who were assassinated or executed List of state leaders who died in office Pan Am Flight 103 SNC-Lavalin affair UTA Flight 772 West Berlin discotheque bombing
=== 1960s === 1960: Rosalyn Yalow received the Nobel Prize in Physiology or Medicine "for the development of radioimmunoassays of peptide hormones" along with Roger Guillemin and Andrew V. Schally who received it "for their discoveries concerning the peptide hormone production of the brain". 1962: Katherine Johnson performed the calculations for the NASA orbital mission, launching John Glenn as the first person into orbit and returning them safely. 1963: Maria Goeppert Mayer became the first American woman to receive a Nobel Prize in Physics; she shared the prize with J. Hans D. Jensen "for their discoveries concerning nuclear shell structure” and Eugene Paul Wigner "for his contributions to the theory of the atomic nucleus and the elementary particles, particularly through the discovery and application of fundamental symmetry principles". She was born in Poland, but became a U.S. citizen in 1933. 1965: Sister Mary Kenneth Keller became the first American woman to earn a Ph.D. in Computer Science. Her thesis was titled "Inductive Inference on Computer Generated Patterns."
Increasing temperature, which evens out the Boltzmann population of states. Conversely, low temperature NMR can sometimes yield better results than room-temperature NMR, providing the sample remains liquid. Saturation of the sample with energy applied at the resonant radiofrequency. This manifests in both CW and pulsed NMR; in the first case (CW) this happens by using too much continuous power that keeps the upper spin levels completely populated; in the second case (pulsed), each pulse (that is at least a 90° pulse) leaves the sample saturated, and four to five times the (longitudinal) relaxation time (5T1) must pass before the next pulse or pulse sequence can be applied. For single pulse experiments, shorter RF pulses that tip the magnetization by less than 90° can be used, which loses some intensity of the signal, but allows for shorter recycle delays. The optimum there is called an Ernst angle, after the Nobel laureate. Especially in solid state NMR, or in samples containing very few nuclei with spin (diamond with the natural 1% of carbon-13 is especially troublesome here) the longitudinal relaxation times can be on the range of hours, while for proton-NMR they are often in the range of one second. Non-magnetic effects, such as electric-quadrupole coupling of spin-1 and spin-3/2 nuclei with their local environment, which broaden and weaken absorption peaks. 14N, an abundant spin-1 nucleus, is difficult to study for this reason. High-resolution NMR instead probes molecules using the rarer 15N isotope, which has spin-1/2.
Cholesterol has 256 stereoisomers that arise from its eight stereocenters. Only two of the stereoisomers have biochemical significance: nat-cholesterol and ent-cholesterol (for natural and enantiomer, respectively). The only cholesterol stereoisomer to occur naturally is nat-cholesterol.
Sources: en.wikipedia.org
===== UPMC Lemieux Sports Complex ===== The UPMC Lemieux Sports Complex, opened in 2015 in Cranberry Township, is a 185,000 square feet (17,200 m2) contains both a comprehensive outpatient facility for UPMC Sports Medicine and the primary training facilities for the NHL's Pittsburgh Penguins, and the secondary venue for their ECHL affiliate, the Wheeling Nailers. The outpatient clinic includes orthopedic, primary care, physical therapy, concussion, imaging, and sports performance services. The training facility includes two-full-sized ice rinks, training and locker rooms, video review facility, and executive offices.
== Interactions == No interactions in humans have been described. Combining racecadotril with an ACE inhibitor can theoretically increase the risk for angioedema. Racecadotril and its main metabolites neither inhibit nor induce the liver enzymes CYP1A2, CYP2C9, CYP2C19, CYP2D6, and CYP3A4. They also do not induce UGT enzymes. This means that racecadotril has a low potential for pharmacokinetic interactions.
Cold boxes are typically used to carry vaccines around the area. It is a self-supporting container with insulation and ice-packs surrounding the interior to keep vaccines at low temperatures. Unlike the refrigerator, the cold box has limited time to maintain temperatures below +10 °C, normally 48–96 hours. It comes in many different types and shapes, and this storage is very useful for the transportation of vaccines in or out of the health facility.
Helena was an art installation by Marco Evaristti originally at the Trapholt museum in 2000. The art consisted of a room with 10 blenders, each of which contained a green swordtail (often misreported as goldfish). The fish were vulnerable to any visitor to the exhibit who chose to turn on a blender and kill them. During the exhibition two fish were killed in this way. Persons present at the initial exhibition of the installation noted that "numerous media representatives who were present... virtually encouraged the visitors to press the button in order to initiate a scandal". Legal complaints resulted in the blenders being unplugged, though the installation remained on display.
In France, Santo Daime won a court case allowing them to use the tea in early 2005; however, they were not allowed an exception for religious purposes, but rather for the simple reason that they did not perform chemical extractions to end up with pure DMT and harmala and the plants used were not scheduled. Four months after the court victory, the common ingredients of ayahuasca as well as harmala were declared stupéfiants, or narcotic schedule I substances, making the tea and its ingredients illegal to use or possess. In June 2019, Oakland, California, decriminalized natural entheogens. The City Council passed the resolution in a unanimous vote, ending the investigation and imposition of criminal penalties for use and possession of entheogens derived from plants or fungi. The resolution states: "Practices with Entheogenic Plants have long existed and have been considered to be sacred to human cultures and human interrelationships with nature for thousands of years, and continue to be enhanced and improved to this day by religious and spiritual leaders, practicing professionals, mentors, and healers throughout the world, many of whom have been forced underground." In January 2020, Santa Cruz, California, and in September 2020, Ann Arbor, Michigan, decriminalized natural entheogens.
Sources: en.wikipedia.org
=== Deficiency === Diminished secretion of LH can result in failure of gonadal function (hypogonadism). This condition is typically manifest in males as failure in production of normal numbers of sperm. In females, amenorrhea is commonly observed. Conditions with very low LH secretions include:
Gentle, non-irritating cleansers and moisturizers are often used alongside medicated treatments to maintain the skin barrier. The condition is common in infants within the first three months of age and adults aged 30 to 70 years. It is more common in males, African Americans, the immunocompromised (such as those with HIV), and those with Parkinson's disease.
=== 1962 === January 15: Indonesian Armed Forces starts to infiltrate into the Dutch overseas territory of western New Guinea as a part of Operation Trikora, the second and last confrontation between Indonesia and the Netherlands over imperialism. February 10: American pilot Francis Gary Powers is exchanged for senior KGB spy Colonel Rudolf Abel. February 20: John Glenn is launched into space aboard Friendship-7 becoming the first American to orbit the Earth. Despite having many delays in the launch itself, the flight is successful. July 1: Rwanda-Burundi becomes independent from Belgium. July 20: Neutralization of Laos is established by international agreement, but North Vietnam refuses to withdraw its personnel. August 2: Jamaica is granted independence by the UK. August 27: Mariner 2 is launched to make a flyby of Venus. August 31: Trinidad and Tobago was granted independence by the UK. September 8: Himalayan War: Chinese forces attack India, making claims on numerous border areas. September 26: the North Yemen Civil War begins between partisans of the Mutawakkilite Kingdom and supporters of the Yemen Arab Republic. October 9: Uganda becomes independent from the UK under Commonwealth status. October 16: Cuban Missile Crisis: the Soviets have secretly been installing military bases, including nuclear weapons, on Cuba, some 90 miles from the US mainland. Kennedy orders a "quarantine" (a naval blockade) of the island that intensifies the crisis and brings the US and the USSR to the brink of nuclear war. In the end, both sides reach a compromise.
=== DNA barcoding and genomics === DNA sequences derived from fungarium specimens can link preserved material to molecular characters used in identification and phylogenetic studies, extending the scientific value of collections beyond traditional morphological characters. Sequencing named fungarium specimens can also expand public reference-sequence databases, improving the interpretation of environmental fungal DNA that would otherwise remain unidentified or only insufficiently identified. DNA in historical specimens is often degraded into short fragments of 40–400 base pairs. Genetic quality is influenced by the specimen's age as well as past exposure to heat, chemicals, or moisture. Consequently, older specimens are less likely to yield uncontaminated internal transcribed spacer (ITS) sequences than more recent collections, often producing DNA from contaminant organisms instead. DNA degradation depends not only on age but also on how specimens were collected, dried, stored, and treated against pests, because historical methods often prioritized preservation of morphology rather than nucleic-acid integrity. Conventional PCR amplification and Sanger sequencing can be difficult or impossible for some specimens, including some type material, owing to fragmentation and contamination by exogenous fungal DNA.
Sources: en.wikipedia.org
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.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
Identity is normally confirmed by mass spectrometry, which checks the measured mass against the expected value near 390 daltons. Reverse-phase high-performance liquid chromatography is used alongside it to assess purity. Amino acid analysis can provide additional composition data.