epithalamin comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-01-03. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not an approved drug | Marketed in most countries as a research chemical |
| Main literature language | Russian and English | Early reports concentrated in Russian journals |
| Typical stated purity | ≥95% by HPLC | Supplier declaration, seldom independently verified |
| Principal studied endpoint | Telomerase activity in vitro | Measured in cultured human cells |
| Reported administration routes | Subcutaneous, intranasal | Described in exploratory use reports |
Regulatory status varies by country and is not harmonized. Epitalon is not an approved drug in major Western jurisdictions. In some countries it is sold as a research chemical, and in others it has appeared in products marketed for other categories. This inconsistent status means that purity, labeling accuracy, and documentation differ widely between suppliers, and verification of identity and purity through independent analysis is the usual way buyers assess a given lot.
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.
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.
The proposed relationship between epitalon and pineal function is a central part of its background. Khavinson's group reported that short peptides corresponding to regions of larger pineal proteins could influence gene expression in cells. Epitalon was framed as a synthetic analogue of an active fragment rather than a direct isolation product. Whether the tetrapeptide reproduces the effects of the parent extract is an open question, because comparative studies are limited and the parent extract itself is not a single defined substance.
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
=== Diagnosis === In 2010, a team from New York described detection of PrPSc in sheep's blood, even when initially present at only one part in one hundred billion (10−11) in sheep's brain tissue. The method combines amplification with a novel technology called surround optical fiber immunoassay (SOFIA) and some specific antibodies against PrPSc. The technique allowed improved detection and testing time for PrPSc. In 2014, a human study showed a nasal brushing method that can accurately detect PrP in the olfactory epithelial cells of people with CJD.
=== Lego peptides / Ionic self-complementary peptides === These peptides are approximately 5 nm in size and have 16 amino acids. The class of Lego peptides has the unique characteristics of having two distinct surfaces being either hydrophobic or hydrophilic, similar to the pegs and holes of Lego blocks. The hydrophobic side promotes self-assembly in water and the hydrophilic side has a regular arrangement of charged amino-acid residues, which in turn brings about a defined pattern of ionic bonds. The arrangement of the residues can be classified according to the order of the charges; Modulus I has a charge pattern of + − + − + −, modulus II + + − − + + − −, and modulus III + + + − − − + + +, and so on. The peptides self-assemble into nanofibers approximately 10 nm long in the presence of alkaline cations or an addition of peptide solution. The fibers form ionic interactions with each other to form checkerboard-like matrices, which develop into a scaffold hydrogel with a high water content of larger than 99.5–99.9% and pores of 10–200 nm in diameter. These hydrogels allow neurite outgrowth and therefore can be used as scaffolds for tissue engineering.
Primary structure: the amino acid sequence. A protein is a polyamide. Secondary structure: regularly repeating local structures stabilized by hydrogen bonds. The most common examples are the α-helix, β-sheet and turns. Because secondary structures are local, many regions of distinct secondary structure can be present in the same protein molecule. Tertiary structure: the overall shape of a single protein molecule; the spatial relationship of the secondary structures to one another. Tertiary structure is generally stabilized by nonlocal interactions, most commonly the formation of a hydrophobic core, but also through salt bridges, hydrogen bonds, disulfide bonds, and even post-translational modifications. The term "tertiary structure" is often used as synonymous with the term fold. The tertiary structure is what controls the basic function of the protein. Quaternary structure: the structure formed by several protein molecules (polypeptide chains), usually called protein subunits in this context, which function as a single protein complex. Quinary structure: the signatures of protein surface that organize the crowded cellular interior. Quinary structure is dependent on transient, yet essential, macromolecular interactions that occur inside living cells. Proteins are not entirely rigid molecules. In addition to these levels of structure, proteins may shift between several related structures while they perform their functions.
Sources: en.wikipedia.org
=== Pharmacodynamics === Dimethocaine and structurally related local anesthetics such as cocaine and procaine inhibit the uptake of dopamine (DA) by blocking dopamine transporters (DAT). The dopamine transporter controls the dynamics of the neurotransmitter dopamine. This neurotransmitter controls many functions including movement, cognition and mood. Drugs such as cocaine and dimethocaine induce dopamine overflow by inhibiting dopamine transporters and thus creating a euphoric effect. In addition to inhibiting dopamine uptake, dimethocaine was also shown to inhibit the binding of CFT, a different dopamine uptake inhibitor. These inhibitory properties are responsible for the stimulatory effects of dimethocaine on the central nervous system. Both in vivo and in vitro measurements of dopamine transporter activity showed that dimethocaine is a potent and efficacious dopaminergic reuptake inhibitor (also called a dopamine indirect agonist). These effects were mainly observed in the nucleus accumbens, a region in the basal forebrain. Comparison of the pharmacological potencies of different local anesthetics revealed the following potency order: cocaine > dimethocaine > tetracaine > procaine > chloroprocaine Furthermore, the administration of dimethocaine has been shown to lead to antinociceptive responses at nontoxic doses in mice. These responses are suggested to be at least partially caused by the effects of dimethocaine on the central nervous system.
== Mechanism of action == The mechanism of action of methyldopa is not fully clear. It may reduce the dopaminergic and serotonergic transmission in the central and peripheral nervous system and it indirectly affects norepinephrine (noradrenaline) synthesis by way of inhibiting dopamine synthesis. Methyldopa acts on alpha-2 adrenergic receptors, which are found on the pre synaptic nerve terminal. This inhibits the release of norepinephrine from the presynaptic neuron. The S-enantiomer of methyldopa is a competitive inhibitor of the enzyme aromatic L-amino acid decarboxylase (LAAD), which converts L-DOPA into dopamine. L-DOPA can cross the blood–brain barrier and thus methyldopa may have similar effects. LAAD converts it into alpha-methyldopamine, a false precursor to norepinephrine, which in turn reduces synthesis of norepinephrine in the vesicles. Dopamine beta hydroxylase (DBH) converts alpha-methyldopamine into alpha-methylnorepinephrine, which is an agonist of the presynaptic α2-adrenergic receptor causing inhibition of neurotransmitter release. Methyldopa has been found to be a monoamine depleting agent.
== Early life and education == Shaw was born in South Boston, and also grew up in Brookline, Massachusetts. Her mother was from South Boston. Shaw's parents divorced when she was four years old. She grew up in a single-mother home with an older half-brother, who owns a bar in Boston. Shaw attended Michael Driscoll School and Brookline High School. At Michael Driscoll, Shaw played full court streetball at a nearby neighborhood park. Shaw said that basketball was a constant of her childhood, and she incorporated it into the pilot and third episode of SMILF. After receiving a scholarship in her junior year, Shaw transferred to the private school Milton Academy in Milton, Massachusetts, where she graduated in 2000. In 2007, she graduated from Barnard College with a degree in literature.
Often, the Senate adopts unanimous consent agreements imposing time limits. In other cases, for example, for the budget process, limits are imposed by statute. However, the right to unlimited debate is generally preserved. Within the United States, the Senate is sometimes referred to as "world's greatest deliberative body".
Sources: en.wikipedia.org
Leucine-rich repeat protein SHOC-2 is a protein that in humans is encoded by the SHOC2 gene. This protein was initially identified in Caenorhabditis elegans as SUR-8/SOC2 and was found to be a critical positive regulator of the ERK1/2 signaling pathway that integrates the Ras and RAF components of the ERK1/2 pathway into a multiprotein complex. Specifically, SHOC2 tethers RAS and PP1C proteins and in close proximity to RAF to dephosphorylate “S259” to enable MAPK signaling. The best-studied role of SHOC2 is in modulating signals of the extracellular signal-regulated kinase 1 and 2 (ERK1/2) pathway by forming a holophosphatase complex that activates RAF proteins.
Vortioxetine is well-absorbed when taken orally and has an oral bioavailability of 75%. It is systemically detectable after a single oral dose by 0.781 hours. Peak levels of vortioxetine are reached within 7 to 11 hours post-dose with single or multiple doses. Steady-state levels of vortioxetine are generally reached within 2 weeks of administration, with 90% of individuals reaching 90% of steady state after 12 days of administration. Steady-state peak levels of vortioxetine with doses of 5, 10, and 20 mg/day were 9, 18, and 33 ng/mL, respectively. The accumulation index of vortioxetine (area-under-the-curve levels after a single dose versus at steady state) is 5 to 6. A loading dose given intravenously has been found to achieve steady-state levels more rapidly with oral vortioxetine therapy. The pharmacokinetics of vortioxetine are known to be linear and dose proportional over a range of 2.5 to 75 mg for single doses and 2.5 to 60 mg for multiple doses. Food has no influence on the pharmacokinetics of vortioxetine. The apparent volume of distribution of vortioxetine is large and ranges from 2,500 to 3,400 L after single or multiple doses of 5 to 20 mg vortioxetine, with extensive extravascular distribution. The plasma protein binding of vortioxetine is approximately 98 or 99%, with about 1.25 ± 0.48% free or unbound. Vortioxetine is extensively metabolized by oxidation via cytochrome P450 enzymes and subsequent glucuronidation via UDP-glucuronosyltransferase.
==== Metabolism and elimination ==== Hepatic – the primary metabolite is 4-carboxypyrazole (about 80 to 85% of an administered dose). Other metabolites include the pyrazoles 4-hydroxymethylpyrazole and the N -glucuronide conjugates of 4-carboxypyrazole and 4-hydroxymethylpyrazole. Following multiple doses, fomepizole rapidly induces its own metabolism via the cytochrome P450 mixed-function oxidase system. In healthy volunteers, 1.0 to 3.5% of an administered dose was excreted unchanged in the urine. The metabolites also are excreted unchanged in the urine. Fomepizole is dialyzable.
Sources: en.wikipedia.org
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.
The most reproducible biochemical observation comes from cultured cells, where the peptide was reported to raise telomerase activity. Whether this translates into measurable health effects in animals or humans is not established.
It is offered as a research chemical for laboratory use, which places it outside the approval pathways applied to medicines. Buyers should expect documentation to differ between suppliers.
It is a synthetic tetrapeptide. Its sequence was derived from research on peptide fractions of bovine pineal extract, and the intact AEDG sequence has not been demonstrated as an abundant free peptide in human tissue.