This is a working overview of epithalamin, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-04-03 and is reviewed periodically as new material appears.
The compound is described in the literature as a derivative of epithalamin, a preparation obtained from bovine pineal tissue. Work on this peptide family was carried out mainly by a research group in Saint Petersburg beginning in the 1980s, and the substance was later registered for clinical use in Russia under the name Epitalon. Outside that region it is generally treated as a research chemical rather than an approved medicine. Statements about its biological activity rest on a relatively small number of studies, and independent replication remains limited.
In its supplied form epitalon is a white to off-white powder, usually lyophilized and often hygroscopic. It dissolves readily in water and in aqueous buffers, and it is commonly handled as the acetate or trifluoroacetate salt to improve stability during purification and drying. The amide backbone is labile in aqueous media, so solutions are less durable than the dry solid. Handling notes in the chemical literature therefore emphasize keeping the powder dry, cool and shielded from light until it is dissolved.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic tetrapeptide | Four residues, linear chain |
| Residue sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG |
| Calculated mass | 390.3 daltons | Value for the free, uncharged form |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility | Freely soluble in water | Often handled as a salt form |
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
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 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.
== Clinical significance in humans == Eccentric hypertrophy is a type of hypertrophy in which the walls and chamber of a hollow organ undergo growth, resulting in an overall increase in size and volume. It is most commonly described in the left ventricle of the heart. Sarcomeres are added in series, as for example in dilated cardiomyopathy (in contrast to hypertrophic cardiomyopathy, a type of concentric hypertrophy, where sarcomeres are added in parallel).
E0: normal ear E1: Minor hypoplasia and cupping with all structures present E2: Absence of external auditory canal with variable hypoplasia of the auricle E3: Malposition of the lobule with absent auricle, lobular remnant usually inferior anteriorly displaced Facial nerve
==== Metal-free organic cavity modifiers ==== Most examples of MOF-based catalysis make use of metal ions or atoms as active sites. Among the few exceptions are two nickel- and two copper-containing MOFs synthesized by Rosseinsky and co-workers. These compounds employ amino acids (L- or D-aspartate) together with dipyridyls as struts. The coordination chemistry is such that the amine group of the aspartate cannot be protonated by added HCl, but one of the aspartate carboxylates can. Thus, the framework-incorporated amino acid can exist in a form that is not accessible for the free amino acid. While the nickel-based compounds are marginally porous, on account of tiny channel dimensions, the copper versions are clearly porous. The Rosseinsky group showed that the carboxylic acids behave as Brønsted acidic catalysts, facilitating (in the copper cases) the ring-opening methanolysis of a small, cavity-accessible epoxide at up to 65% yield. Superior homogeneous catalysts exist however. Kitagawa and co-workers have reported the synthesis of a catalytic MOF having the formula [Cd(4-btapa)2(NO3)2]. The MOF is three-dimensional, consisting of an identical catenated pair of networks, yet still featuring pores of molecular dimensions. The nodes consist of single cadmium ions, octahedrally ligated by pyridyl nitrogens. From a catalysis standpoint, however, the most interesting feature of this material is the presence of guest-accessible amide functionalities. The amides are capable of base-catalyzing the Knoevenagel condensation of benzaldehyde with malononitrile.
Despite the fact that consistories in Freemasonry are only meant to administer the higher degrees, the Consistory believed it had authority to manage the Blue Lodges. The Supreme Council, despite being designed to administer the 33rd degree, had started chartering new Lodges without consulting the Grand Lodge of Colon. On May 22, 1860, Restauracion Lodge No. 4 was chartered in Jiguaní. In 1861, Amor Fraternal No. 5, Segunda Prudencia No. 6, and Dicipulos de Salomon No. 7 were chartered. In 1862, Fe Masonica Lodge was formed in Havana by members of Amor Fraternal.
=== Kidney transplant === SIUT is performing deceased organ donation since two decades as one person loses his fight to live every 3 minutes due to end stage organ failure in the country. First renal transplant was performed at SIUT Chablani Medical Center, Sukkur on Sunday 28 April 2019.
Sources: en.wikipedia.org
Sickle cell disease is a group of diseases caused by a mutation in a subunit of hemoglobin, a protein found in red blood cells responsible for transporting oxygen. The most dangerous of the sickle cell diseases is known as sickle cell anemia. Sickle cell anemia is the most common homozygous recessive single gene disorder, meaning the affected individual must carry a mutation in both copies of the affected gene (one inherited from each parent) to experience the disease. Hemoglobin has a complex quaternary structure and is composed of four polypeptide subunits – two A subunits and two B subunits. Patients with sickle cell anemia have a missense or substitution mutation in the gene encoding the hemoglobin B subunit polypeptide chain. A missense mutation means the nucleotide mutation alters the overall codon triplet such that a different amino acid is paired with the new codon. In the case of sickle cell anemia, the most common missense mutation is a single nucleotide mutation from thymine to adenine in the hemoglobin B subunit gene. This changes codon 6 from encoding the amino acid glutamic acid to encoding valine. This change in the primary structure of the hemoglobin B subunit polypeptide chain alters the functionality of the hemoglobin multi-subunit complex in low oxygen conditions. When red blood cells unload oxygen into the tissues of the body, the mutated haemoglobin protein starts to stick together to form a semi-solid structure within the red blood cell.
As mentioned before, microneedles have also been explored for local targeted drug delivery at other drug delivery sites, such as the gastrointestinal, ocular, vascular etc., of which, ocular, vaginal and gastrointestinal have shown increasingnly convincing outcomes where they serve as a more efficient, localised drug delivery system, without the drawbacks of systemic exposure/toxicity. The major goal of any microneedle design is to penetrate the skin's outermost layer, the stratum corneum (10-15μm). Microneedles are long enough to cross the stratum corneum but not so long that they stimulate nerves which are located deeper in the tissues and therefore cause little to no pain. Research has shown that there is a limit on the type of drugs that can be delivered through intact skin. Only compounds with a relatively low molecular weight, like the common allergen nickel (130 Da), can penetrate the skin. Compounds that weigh more than 500 Da cannot penetrate the skin.
== Examples == ornithine translocase (SLC25A15), associated with ornithine translocase deficiency. carnitine-acylcarnitine translocase (SLC25A20), associated with carnitine-acylcarnitine translocase deficiency. Translocase of outer mitochondrial membrane 40 (TOMM40), a protein encoded by the TOMM40 gene, whose alleles differentially impact the risk for Alzheimer's disease
=== Crohn's disease === Three phenotypes, or categories of disease, are present in Crohn's disease: stricturing disease (which causes narrowing of the bowel), penetrating disease (which causes fistulae or abnormal connections of the bowel), and inflammatory disease (which primarily causes inflammation).
Sources: en.wikipedia.org
Moderate pain, which improves on elevation (unlike arterial ulcers which worsen with elevation) Irregular, sloping edges Associated oedema, due to increased hydrostatic pressure, which contributes to 'atrophie blanche' 'Atrophie blanche', localised loss of skin pigmentation due to death of erythrocytes and scarring Lipodermatosclerosis, a hardening of the skin which can lead to an "inverted champagne bottle" appearance to the leg Associated superficial varicose veins or "ankle flare", a collection of small, dark, engorged superficial veins
The company had originally been incorporated as Tim Donut Limited. By the 1990s, the company name had changed to The TDL Group Ltd. This was an effort by the company to diversify the business, removing the primary emphasis on donuts, and continuing the expansion of the menu options as consumer tastes broadened. Some older locations retain signage with the company's name, including a possessive apostrophe, despite the fact that the official styling of the company's name has been Tim Hortons without an apostrophe for at least a decade. The company had removed the apostrophe after signs using the apostrophe was interpreted by some to be breaking the language sign laws of the province of Quebec in 1993. The removal of the apostrophe allowed the company to have one common sign image across Canada. Although a number of Quebec locations have bilingual menu boards, the decision to have both Canadian official languages represented is left to the discretion of individual franchise owners. Some Quebec locations have French-only menu boards. It is the strong recommendation to all the Quebec restaurants from the TDL Group Corporation that they post menu boards in both English and French in accordance with the standards being enforced by the Office québécois de la langue française.
Secretary of Defense Pete Hegseth said, "We devastated the Iranian nuclear program, but it's worth noting that the operation did not target Iranian troops or the Iranian people." On June 22, Trump said that since the Islamic regime in control of Iran has failed to make Iran great, it should be replaced to "Make Iran Great Again". Later, he posted on social media that their constant anger, hostility, and despair have only led them to ruin. The path they're on offers no hope, only more hardship, "I wish the leadership of Iran would realize that you often get more with honey than you do with vinegar".
=== Resolution === The inflammatory response must be actively terminated when no longer needed to prevent unnecessary "bystander" damage to tissues. Failure to do so results in chronic inflammation, and cellular destruction. Resolution of inflammation occurs by different mechanisms in different tissues. Mechanisms that serve to terminate inflammation include:
=== Identification of a suitable chain === Consult the saw's manual to determine which chain/bar combinations are compatible with the saw. A given saw will usually accept a number of different bars and chains.
Sources: en.wikipedia.org
The peptide contains four residues in the order alanine, glutamate, aspartate and glycine, abbreviated AEDG. The chain is linear and held together by three peptide bonds. Its calculated mass for the uncharged free form is about 390.3 daltons.
Epithalamin refers to a crude preparation derived from bovine pineal tissue, which contains many components. Epitalon is a single synthetic tetrapeptide identified from that material and produced by chemical synthesis. The two names are sometimes confused because early reports treated the synthetic peptide as an active fragment of the extract.
It has been registered for clinical use in Russia, where it is associated with a small family of short peptides. In most other jurisdictions it is not an approved medicine and is traded as a research chemical. Regulatory status varies by country and changes over time.
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.