If you have been reading about AEDG 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.
Updated 2026-03-25. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
The compound is generally described as a synthetic analogue of a fragment isolated from a pineal gland extract. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology introduced it during the 1980s and 1990s while studying short peptides from animal tissue. The original extract, called epithalamin, is a heterogeneous mixture, whereas epitalon is a single defined sequence. That distinction matters because findings reported for the extract are not automatically findings about the pure tetrapeptide, and claims about broader biological effects remain a separate question from the chemical identity described here.
Residue composition is the property that most cleanly separates verified material from mislabelled samples. Alanine, glutamate, aspartate and glycine appear in that order from the N-terminus, and the two acidic residues sit in the middle of the chain. Because the peptide is short, it can be produced by solid-phase synthesis and characterised by mass spectrometry without ambiguity. Any reported sample whose measured mass departs substantially from 390 daltons is a different compound or a degraded mixture rather than epitalon.
| 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 |
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
The four residues give epitalon a molecular formula of C14H22N4O9 and a molecular weight near 390.35 daltons. The presence of two acidic residues, glutamate and aspartate, makes the free peptide strongly acidic, while the alanine and glycine ends provide neutral, nonpolar character. This combination produces a molecule with substantial water solubility. Because there are no cysteine, methionine, or tryptophan residues, the peptide lacks the most common oxidation-sensitive side chains, which simplifies handling compared with many longer peptides.
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 parent extract epithalamin was characterised as a low-molecular-weight fraction of pineal tissue rather than a single defined chemical entity. Researchers fractionated it and tested successive fragments for activity, a screening approach typical of peptide discovery work in that era. Epitalon emerged from that process as one of the shorter sequences of interest. Because the original extract was never fully resolved into individual components, claims about which constituent drives a given effect rest on inference. This distinction matters when reading older reports that attribute extract observations to the tetrapeptide itself.
Vasopressin is released into the brain in a circadian rhythm by neurons of the suprachiasmatic nucleus. Vasopressin released from posterior pituitary is associated with nausea. Recent evidence suggests that vasopressin may have analgesic effects. The analgesia effects of vasopressin were found to be dependent on both stress and sex.
Sildenafil protects cyclic guanosine monophosphate (cGMP) from degradation by cGMP-specific phosphodiesterase type 5 (PDE5) in the corpus cavernosum. Nitric oxide (NO) in the corpus cavernosum of the penis binds to guanylate cyclase receptors, which results in increased levels of cGMP, leading to smooth muscle relaxation (vasodilation) of the intimal cushions of the helicine arteries. This smooth muscle relaxation leads to vasodilation and increased inflow of blood into the spongy tissue of the penis, causing an erection. Robert F. Furchgott, Ferid Murad, and Louis Ignarro won the Nobel Prize in Physiology or Medicine in 1998 for their independent study of the metabolic pathway of nitric oxide in smooth muscle vasodilation. The molecular mechanism of smooth muscle relaxation involves the enzyme CGMP-dependent protein kinase, also known as PKG. This kinase is activated by cGMP and it phosphorylates multiple targets in the smooth muscle cells, namely myosin light chain phosphatase, RhoA, IP3 receptor, phospholipase C, and others. Overall, this results in a decrease in intracellular calcium and desensitizing proteins to the effects of calcium, engendering smooth muscle relaxation. Sildenafil is a potent and selective inhibitor of cGMP-specific phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and increased penile response to sexual stimulation.
=== Azerbaijani === In Azerbaijani, which is an agglutinative language, there is theoretically no limit on word compounding.An example is the 42-letter word Elektrikləşdirdiklərimizdənsinizmişcəsinə; pronounced [elektɾiklæʃdiɾdiklæɾimizˈdænsinizmiʃdʒæsinæ] , which translates to "As if you were from those ones we have electrified". There is a shorter more well-known 32-long word, which is a tongue twister, too — Elektrikləşdirilmişlərdənsinizmi?; pronounced [elektɾiklæʃdiɾilmiʃlæɾˈdænsinizmi] meaning "Are you from the ones who are electrified?".
== Definition == In vitro (Latin for "in glass"; often not italicized in English usage) studies are conducted using components of an organism that have been isolated from their usual biological surroundings. As the name suggests, in vitro experiments, colloquially "test-tube experiments", are traditionally done in glass labware, using test tubes, flasks, Petri dishes, etc. The exact scope of in vitro depends on what is considered to be in vivo (experiments done on whole living beings), and in turn what is considered to be a "whole" living being:
Sources: en.wikipedia.org
Aspergillopepsin I (EC 3.4.23.18, Aspergillus acid protease, Aspergillus acid proteinase, Aspergillus aspartic proteinase, Aspergillus awamori acid proteinase, Aspergillus carboxyl proteinase, carboxyl proteinase, Aspergillus kawachii aspartic proteinase, Aspergillus saitoi acid proteinase, pepsin-type aspartic proteinase, Aspergillus niger acid proteinase, sumizyme AP, proctase P, denapsin, denapsin XP 271, proctase) is an enzyme. This enzyme catalyses the following chemical reaction
=== Pharmacokinetics === Orally administered endoxifen is rapidly absorbed and systemically available. The time to peak (Tmax) is between 4.5 and 6 hours after oral administration. It is not metabolized by cytochrome P450 enzymes. The half-life (t½) life of endoxifen is 52.1 to 58.1 hours.
The history of molecular biology begins in the 1930s with the convergence of various, previously distinct biological and physical disciplines: biochemistry, genetics, microbiology, virology and physics. With the hope of understanding life at its most fundamental level, numerous physicists and chemists also took an interest in what would become molecular biology. In its modern sense, molecular biology attempts to explain the phenomena of life starting from the macromolecular properties that generate them. Two categories of macromolecules in particular are the focus of the molecular biologist: 1) nucleic acids, among which the most famous is deoxyribonucleic acid (or DNA), the constituent of genes, and 2) proteins, which are the active agents of living organisms. One definition of the scope of molecular biology therefore is to characterize the structure, function and relationships between these two types of macromolecules. This relatively limited definition allows for the estimation of a date for the so-called "molecular revolution", or at least to establish a chronology of its most fundamental developments.
OXT decreases pancreatic islet hypertrophy. OXT has antioxidant and anti-inflammatory effects. Pancreatic islet inflammation is an important factor in the pathogenesis of diabetes. The protection of β-cells from death is considered as a new therapeutic target. The hypoglycaemic effect, stimulatory effect on insulin secretion and sensitivity, and improvement of pancreatic islet cells after OXT administration, strongly suggested that OXT might be a therapeutic target for treating diabetes Deficits in OXT or its receptor developed hyperleptinemia and late-onset obesity with increases in abdominal fats and fasting plasma triglycerides The balance of leptin and adiponectin in diabetic patients can be used as a predictor of insulin resistance and a useful indicator for the choice of drug to treat diabetes mellitus Oxytocin levels:
=== EC 1.11.2 Peroxygenase === EC 1.11.2.1: unspecific peroxygenase EC 1.11.2.2: myeloperoxidase EC 1.11.2.3: plant seed peroxygenase EC 1.11.2.4: fatty-acid peroxygenase EC 1.11.2.5: 3-methyl-L-tyrosine peroxygenase EC 1.11.2.6: L-tyrosine peroxygenase
Sources: en.wikipedia.org
=== Age-Related and Pathological Changes === Deposition of secondary cementum may alter the diameter and shape of the apical foramen over time. Pathological conditions such as periodontal diseases can cause widening or resorption of the apical foramen.
Water treatment is any process that improves the quality of water to make it appropriate for a specific end-use. The end use may be drinking, industrial water supply, irrigation, river flow maintenance, water recreation or many other uses, including being safely returned to the environment. Water treatment removes contaminants and undesirable components, or reduces their concentration so that the water becomes fit for its desired end-use. This treatment is crucial to human health and allows humans to benefit from both drinking and irrigation use. Advanced water treatment methods have been developed in recent decades due to increased concerns about new pollutants like microplastics, pharmaceuticals, and per- and polyfluoroalkyl substances (PFAS). These include advanced oxidation processes, membrane filtration, and adsorption-based techniques utilizing materials like tailored nanomaterials and activated carbon. Additionally, energy efficiency, resource recovery, and sustainability in water treatment systems are receiving more attention, especially in areas where water is scarce and environmental demands are growing.
== Ghana, Togo, Ivory Coast and Tanzania == Mohamed Ibn Chambas - lawyer, diplomat, politician and academic. Special Representative of the secretary-general and head of the United Nations Office for West Africa (UNOWA); First Executive Secretary of ECOWAS, former Deputy Foreign Secretary and Deputy Minister of Education, Ghana Tidjane Thiam - Former CEO of Prudential and Credit suisse, First African CEO of a Fortune Global 500 company, former Minister Of planning and National Development, Member Olympics committee, Côte d'Ivoire. Cheick Ousmane Diakité - Imam, president of the Higher Council of Imams, Mosques and Islamic Affairs of Côte d'Ivoire (Cosim). Ahmed Ramadan - politician and former chairman of People's National Convention (PNC). Father of Second Lady of Ghana Iddrisu Baba Said Sinare - former member of parliament, former ambassador to Egypt and Saudi Arabia, Ghana. Samira Bawumia - Politician, Second Lady of Ghana Mohammed Adamu Ramadan - Politician and member of the NDC, Ghana. Barry Moussa Barqué - Politician held multiple ministerial positions, including: Mines, Energy, Foreign Affairs, Finance Etc., Special Adviser to the president with the rank of Minister, current president of the National Assembly Togo. Ramata Ly-Bakayoko - Professor of pediatric dentistry, First female president of the University Félix-Houphouët-Boigny, former Minister of Higher Education and Scientific Research, Minister of Women, Families and Children, Ivory Coast. Aboudramane Sangaré - former minister of foreign affairs, Ivory Coast.
The Individualized Quality Control Plan (IQCP) is a quality management system consisting of a Risk Assessment (RA), Quality Control Plan (QCP), and Quality Assessment (QA), under the US Clinical Laboratory Improvement Amendments (CLIA) federal regulatory standards. It is designed to enable regulated medical laboratories to manage the frequency of their quality control. Beginning Jan 1, 2016, US laboratories under CLIA performing non-waived testing were required to either perform two levels of controls daily or implement an IQCP. An IQCP may be less stringent than CLIA, but not less stringent than the manufacturers recommendation. IQCPs were introduced in 2013 enabling a transition period. An IQCP is based on a laboratory's own data and includes a risk assessment of potential errors in the preanalytical, analytical, and postanalytical phases and the likelihood and impact of potential patient harm for each error.
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.
It is a four-amino-acid peptide built from alanine, glutamate, aspartate and glycine in that order. Its formula is C14H22N4O9, and it is made by chemical synthesis rather than extracted from tissue. The synthetic peptide is a single defined molecule, unlike the pineal extracts it is often compared with.