The short version of pineal peptides fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-01-30 and is reviewed periodically as new material appears.
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.
The most widely cited claim is that epitalon activates telomerase and thereby extends telomere length. Supporting evidence comes largely from cultured human cells, where treatment was associated with increased telomerase activity and delayed replicative senescence. Telomerase activation is a biologically consequential effect, since the enzyme is largely silenced in most somatic cells. However, the route by which a short peptide would reach and act on the enzyme's regulatory machinery has not been established. Independent replication in human trials is scarce, so the link between cell-culture observations and whole-body aging remains an open question.
Human data are limited to small studies, often without the randomization, blinding, or control groups expected in contemporary clinical research. Reported outcomes have included changes in melatonin levels, immune markers, and subjective measures, but sample sizes were generally too small to support firm conclusions. Some reviews treat the peptide as promising while noting methodological weaknesses; others question whether the observed effects are specific. The compound is frequently discussed in longevity-focused communities, where enthusiasm often outpaces the published evidence. Separating established findings from speculation is therefore important when reading summaries of this research.
Epitalon emerged from research conducted in Saint Petersburg by Vladimir Khavinson and colleagues, who studied short peptides as potential regulators of aging. The work built on epithalamin, a pineal gland extract reported to influence neuroendocrine function. Epitalon was designed as a synthetic counterpart with a defined sequence, allowing reproducible experiments that extracts could not support. Early publications described effects on melatonin rhythms and lifespan in animal models. These findings circulated mainly in Russian-language journals during the 1990s, which limited their visibility among English-speaking researchers.
| 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 |
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.
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.
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.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
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.
Identity and purity of epitalon samples are normally established by reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, combined with mass spectrometry. The mass spectrum confirms the expected molecular ion and can reveal truncated or oxidised by-products. Amino acid analysis after acid hydrolysis verifies that the four residues are present in the expected ratio. Certificates typically report a purity figure taken from chromatographic peak area, expressed as a percentage of total integrated signal.
The three substrates of this enzyme are (E)-coniferyl aldehyde, oxidised nicotinamide adenine dinucleotide (NAD+), and water. Its products are ferulic acid, reduced NADH, and a proton. The enzyme can use nicotinamide adenine dinucleotide phosphate as an alternative cofactor. This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is coniferyl aldehyde:NAD(P)+ oxidoreductase.
Aflibercept: A human recombinant protein that aids in the treatment of oxaliplatin-resistant metastatic colorectal cancer, neo-vascular macular degeneration, and macular edema. Rilonacept: Reduces inflammation by preventing activation of IL-1 receptors to treat cryopyrin-associated periodic syndromes (CAPS). Alefacept: Regulated T-cell responses by selectively targeting effector memory T-cells to treat psoriasis vulgaris. Romiplostim: A peptibody that treats immune thrombocytopenia. Abatacept/Belatacept: Interferes with T-cell co-stimulation to treat autoimmune disorders like rheumatoid arthritis, psoriatic arthritis, and psoriasis. Denileukin-diftitox: Treats cutaneous lymphoma.
== Other animals == Extensive comparative anatomy work has been done to study the evolution of pancreatic islets across representatives of all major groups of vertebrates and a number of different invertebrates. Islet organs are absent in any invertebrate and primitive chordates (tunicates and lancelets). During the evolution of vertebrates, the cell types secreting peptides related to insulin, somatostatin, glucagon, and PP moved from the brain to the gastrointestinal track mucosa (insulin first in tunicates, all four in lancelets), and then migrated out sequentially to form an islet structure (insulin and somatostatin first in jawless fish, followed by glucagon in jawed cartilaginous fish, few or no PP in lobe-finned bony fish, numerous PP in some ray-finned bony fish, ghrelin detected in catfish). In birds, other peptide-secreting cells such as IGF-1, PYY, and adrenomedullin have been localized in the islets. Notably, American anglerfish pancreas — unlike those of mammals — has islets that are rich in endocrine cells and mostly free of pancreatic exocrine tissue, making them ideal sources of endocrine cells for research. It eventually enabled the isolation of the cDNA for preproglucagon, which contained the sequence for glucagon and two other glucagon-like peptides (GLP-1 and GLP-2).
In Egypt, Al-Azhar University was founded in 970 AD as a madrasa; it formally became a public university in 1961 and is one of the oldest institutions of higher education in the world. In the 20th century, Egypt opened many other public universities with government-subsidized tuition fees, including Cairo University in 1908, Alexandria University in 1912, Assiut University in 1928, Ain Shams University in 1957, Helwan University in 1959, Beni-Suef University in 1963, Zagazig University in 1974, Benha University in 1976, and Suez Canal University in 1989.
Sources: en.wikipedia.org
=== Single-molecule force spectroscopy === Single molecule techniques such as optical tweezers and AFM have been used to understand protein folding mechanisms of isolated proteins as well as proteins with chaperones. Optical tweezers have been used to stretch single protein molecules from their C- and N-termini and unfold them to allow study of the subsequent refolding. The technique allows the measurement of folding rates at single-molecule level; for example, optical tweezers have been recently applied to study folding and unfolding of proteins involved in blood coagulation. von Willebrand factor (vWF) is a protein with an essential role in blood clot formation process. It was discovered – using single molecule optical tweezers measurement – that calcium-bound vWF acts as a shear force sensor in the blood. Shear force leads to unfolding of the A2 domain of vWF, whose refolding rate is dramatically enhanced in the presence of calcium. It has also been shown that the simple src SH3 domain accesses multiple unfolding pathways under force.
== History == The founding of the Jere Ngoni Kingdom was precipitated by the Mfecane, a period of widespread instability and state formation in Southern Africa, caused by pre-existing trends of political centralisation which were catalysed by the effects of international trade, environmental instability, and European colonial expansion. An early state was the Ndwandwe led by Zwide; after Zwide defeated Dingiswayo's Mthethwa c. 1816, the Mthethwa state disintegrated and some groups were incorporated into Ndwandwe. Zwide next engaged the expanding Zulu led by Shaka, but was defeated in battle c. 1819. Following this defeat, Zwangendaba (one of Ndwandwe's Indunas) led his group on a long-distance migration northwards, and they became known as the Jere Ngoni (separate from the Maseko Ngoni). Zwangendaba initially settled around the Mkomati River (north of Delagoa Bay), but fled north after clashing with other rulers such as Soshangane, Nxaba, and Mzilikazi. Zwangendaba entered onto the Zimbabwean Plateau and raided the Rozvi Empire for several years, before crossing the Zambezi in 1835. He left some troops behind with a relative of his (Nyamazana) who later killed the Rozvi king. In 1840 Zwangendaba's forces massacred many Tonga for allegedly causing him illness, and they captured many Chewa and Tumbuka. The Ngoni later reached the Ufipa Plateau, where in the late 1840s Zwangendaba died.
Plasmids are double-stranded extra chromosomal and generally circular DNA sequences that are capable of replication using the host cell's replication machinery. Plasmid vectors minimalistically consist of an origin of replication that allows for semi-independent replication of the plasmid in the host. Plasmids are found widely in many bacteria, for example in Escherichia coli, but may also be found in a few eukaryotes, for example in yeast such as Saccharomyces cerevisiae. Bacterial plasmids may be conjugative/transmissible and non-conjugative:
== Technology == CIM monoliths are made of porous methacrylate polymers composed of interconnected channels that range in size from 1-6 μm. It is these channels that account for the media separation power and flow characteristics and ability to purify large biomolecules, such as large proteins, immunoglobulins, plasmid DNA and viruses with their activity intact. Components to be separated are conveyed to the active groups located on the surface of the channels by bulk flow of the mobile phase. Since the channels are interconnected, there is no diffusion, no dead end pores, no void volume and no stagnant zones to slow down the transport between the stationary and mobile phase. Consequently, monolithic columns have flow independent resolution and binding capacity. They exhibit low back pressure, even at very high flow rates. In this way, the purification time can be significantly decreased, resulting in a pronounced reduction of the purification process costs.
Narrated by Miriam Margolyes, directed by Karl Sabbagh, made by Skyscraper Productions with KCTS 5 October The Mystery of Anastasia, an Equinox Special, about Anna Anderson; the Romanovs were murdered in Siberia on 17 July 1918; the Forensic Science Service at Aldermaston; forensic scientist William R. Maples; Peter Kurth; David Ellen, of Scotland Yard; Gleb Botkin; Peter Vanezis, Regius Professor of Forensic Medicine (Glasgow) and ears; former Danish ambassador to Germany Herluf Zahle; Ernest Louis, Grand Duke of Hesse hired detective Martin Knopf, who found Anna Anderson's possible name; Geoff Oxley, and facial recognition computing looking at Frances; Patrick Lincoln of London Hospital Medical College, and heredity of blood groups, and the A2 blood group; Peter French, who researched pronunciation; pathologist Hunt MacMillan III and Peter Gill of the Forensic Science Service (Birmingham); in Charlottesville in June 1994; David Enoch (psychiatrist) of the Royal Liverpool University Hospital; the Duke of Edinburgh provided a blood sample to prove mitochondrial DNA, as he was related to Anastasia; Prince Rostislav Rostislavovich Romanov (1938-1999), father of Prince Rostislav Romanov (born 1985); Kevin Sullivan of the Forensic Service; Anna Anderson was not Anastasia, according to mitochondrial DNA of the Duke of Edinburgh.
Sources: en.wikipedia.org
== Education and career == She received her PhD degree from the University of Glamorgan (now the University of South Wales) in 2003. She currently works Director of Research & Development in Aneurin Bevan Health Board.
Newer methods, such as plasma polymerization do not fit neatly into either category. Synthetic polymerization reactions may be carried out with or without a catalyst. Laboratory synthesis of biopolymers, especially of proteins, is an area of intensive research.
Local fruits are quite common (including mangoes, papayas, and bananas) and fresh vegetables (including cassava and sweet potatoes). Mealtime is a communion for families and schools and some businesses close at midday for lunch, reopening later in the afternoon.
Treponema pallidum pallidum is a motile spirochete that is generally acquired by close sexual contact, entering the host via breaches in squamous or columnar epithelium. The organism can also be transmitted to a fetus by transplacental passage during the later stages of pregnancy, giving rise to congenital syphilis. The helical structure of T. p. pallidum allows it to move in a corkscrew motion through mucous membranes or enter minuscule breaks in the skin. In women, the initial lesion is usually on the labia, the walls of the vagina, or the cervix; in men, it is on the shaft or glans of the penis. It gains access to the host's blood and lymph systems through tissue and mucous membranes. In more severe cases, it may gain access to the host by infecting the skeletal bones and central nervous system of the body. Despite effective antibiotic treatment since the mid twentieth century, this infection has been emerging globally in the last few decades. In 2021, approximately 6 million new infections occurred globally. In laboratory cultures, some contemporary variants of T. p. pallidum strains have been failing to respond to the second line antibiotic azithromycin. This phylogenetic divergence and global presence point to the emergence of a pandemic strain cluster. In addition to phylogenetic divergence, the switch to confidential record keeping resulted in an overall decrease in quality of tracking and recording disease prevalence. The incubation period for a T. p. pallidum infection is usually around 21 days, but can range from 10 to 90 days.
These early structural studies were not followed up until recent years with the renewed interest in bottromycin. The structure was confirmed in the 1980s and 1990s to be a cyclic iminopeptide based on NMR studies, with a linear side chain connected to the macrocycle via an amidine linkage. Its absolute stereochemistry, however, was not characterized until 2009. Stereochemistry at carbon 18 and 25 was proposed by comparing predicted conformers obtained using molecular dynamics to experimental constraints obtained through NMR experiments. Stereochemistry at carbon 43 was confirmed by comparing 1H NMR of authentic hydrolysis product to a chemically synthesized sample of the same fragment. Finally, optical rotation, 1H NMR, and HRMS experiments of chemically synthesized bottromycin matched that of biologically produced bottromycin. The three-dimensional solution structure of bottromycin A2 was solved by NMR in 2012. The overall structure was obtained with good resolution (RMSD 0.74±0.59 Å), with a RMSD of 0.09±0.06 Å for the macrocycle. In this study, it was proposed that the methylated proline residue contributed to the restricted conformation of the macrocycle. The methylated proline and β-OMe alanine residues were found to be on the same face of bottroymycin A2 and it was suggested that this characteristic contributed to binding of bottromycin to the ribosomal A site.
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.
Vladimir Khavinson and colleagues at research institutes in Saint Petersburg developed and studied the peptide. Their program examined short peptides as regulators of aging and neuroendocrine function. Epitalon was one of several compounds produced by that group.