The short version of Pineal peptide fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-03-26. Anything still debated is marked as such rather than presented as settled.
The molecule is a short, linear, hydrophilic peptide that dissolves readily in water or aqueous buffer. Its principal chemical liabilities are hydrolytic rather than oxidative, since it contains no cysteine, methionine, or tryptophan residues. The aspartate–glycine step is a recognised site for aspartimide formation under mildly acidic or basic conditions, generating isoaspartate and succinimide-related products over time. Desiccated lyophilised powder held at −20 °C is comparatively stable, whereas dilute solutions degrade faster and are best frozen as single-use aliquots rather than thawed repeatedly.
No pharmacopoeial monograph exists for this peptide, so quality rests on the supplier's internal specifications and on whatever independent testing a purchaser arranges. Certificates of analysis differ widely in which tests they report and in the limits applied. The counter-ion introduced during purification, commonly acetate or trifluoroacetate, changes the net peptide content of a given mass of powder, so two samples of equal weight may not contain equal amounts of the active sequence. Third-party laboratories can verify purity, identity, residual solvents, and counter-ion content for a fee, which makes documentation more informative than labelling.
Verification of a sample usually begins with reversed-phase high-performance liquid chromatography, which resolves the peptide from truncated sequences and other impurities and expresses purity as a percentage of total peak area. Mass spectrometry by electrospray ionisation or matrix-assisted laser desorption supplies an independent check, because the measured mass can be compared against the theoretical value for AEDG. Amino acid analysis or tandem mass spectrometry sequencing can confirm residue order. Each of these methods answers a different question: a purity figure does not establish identity, and an identity match does not establish how much of the material is intact peptide.
Epitalon is a synthetic tetrapeptide whose sequence is alanine-glutamate-aspartate-glycine, written in single-letter code as AEDG. The four residues are joined by three peptide bonds, giving a linear backbone with no branching and no disulfide bridges. Its calculated molecular mass for the free form is approximately 390.3 daltons, a figure that rises when the compound is supplied as an acetate or trifluoroacetate salt. Because the chain is short, the molecule is defined entirely by its residue order rather than by any folded three-dimensional structure.
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.
| Property | Value | Notes |
|---|---|---|
| Identity confirmation | Electrospray or MALDI mass spectrometry | Observed mass compared with theoretical 390.35 Da |
| Purity specification | 95 percent or greater by RP-HPLC | Common convention for research-grade peptide |
| Counter-ion | Acetate or trifluoroacetate | Affects net peptide content of a weighed sample |
| Solution storage | −80 °C as single-use aliquots | Repeated freeze–thaw cycles accelerate loss |
| Main degradation route | Aspartimide formation at Asp-Gly | Produces isoaspartate and related species |
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.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
Freeze-dried epitalon is normally kept at minus twenty degrees Celsius in a sealed, desiccated container, protected from light. Short excursions at ambient temperature during shipping are generally tolerated, but repeated warming and cooling cycles encourage moisture uptake, which shortens shelf life. Once dissolved, the peptide is far less stable than the solid: aqueous solutions are subject to hydrolysis and to deamidation at the aspartate and glutamate residues. Working solutions are therefore held refrigerated and used within days, and repeated freezing and thawing of the same vial is best avoided.
Modeled on Europe's Christkindlmarkt, in 2002 Bryant Park introduced the Holiday Shops in an effort to liven up the park space during the winter. Initially slow to gain traction, the Holiday Shops became a fixture of the Manhattan holiday scene in 2005 by adding an ice-skating rink. The Shops also include a Norway Spruce tree, as well as a standalone dining and event space. Sponsored by Bank of America, Winter Village can be set up within two weeks. In September 2016, Bryant Park Corporation announced market makers Urbanspace as the new operator for the Holiday Shops, which grew from 80 boutiques in 2002 to over 170 in 2018. In 2018, Urbanspace also took over management of the rinkside eatery, rebranding it as The Lodge. The Gothamist wrote in 2024 that visitors had mixed views of Winter Village; though tourists and some New Yorkers liked Winter Village's shops and food stands, detractors felt that the shops were overcrowded.
Andre Francis Palmer is an American engineer who is the Associate Dean for research in the College of Engineering and the Fenburr Ohio Eminent Scholar and Professor of Chemical and Biomolecular Engineering at Ohio State University. He is an expert on hemoglobin-based oxygen carriers and biomaterials used in transfusion medicine.
Shulman proposed that lipid-induced insulin resistance results from the accumulation of sn-1,2-diacylglycerol (DAG) in the plasma membrane, which activates novel protein kinase C (nPKC) isoforms—PKCθ in skeletal muscle and PKCε in liver and white adipose tissue—impairing insulin signaling. Shulman's lab explored interventions such as weight loss, thiazolidinediones, adiponectin, leptin, and liver-targeted mitochondrial protonophores to reverse insulin resistance by lowering plasma membrane DAG and inhibiting the nPKC pathway. He also pioneered 13C and 31P NMR methods to measure ATP synthesis and mitochondrial oxidation in vivo. His team identified age-related declines in mitochondrial fat oxidation linked to insulin resistance in elderly individuals, and in insulin-resistant offspring of people with T2D. They showed that chronic AMPK activation drives mitochondrial biogenesis via increased expression of PGC-1α. Shulman used 13C NMR to quantify rates of hepatic glycogenolysis and gluconeogenesis, showing that the latter accounts for over half of fasting hepatic glucose production following an overnight fast overturning the Cahill hypothesis that hepatic glycogenolysis accounts for >90% of glucose production in humans following an overnight fast.
Sources: en.wikipedia.org
== Other uses == Some chemotherapy drugs are used in diseases other than cancer, such as in autoimmune disorders, and noncancerous plasma cell dyscrasia. In some cases they are often used at lower doses, which means that the side effects are minimized, while in other cases doses similar to ones used to treat cancer are used. Methotrexate is used in the treatment of rheumatoid arthritis (RA), psoriasis, ankylosing spondylitis and multiple sclerosis. The anti-inflammatory response seen in RA is thought to be due to increases in adenosine, which causes immunosuppression; effects on immuno-regulatory cyclooxygenase-2 enzyme pathways; reduction in pro-inflammatory cytokines; and anti-proliferative properties. Although methotrexate is used to treat both multiple sclerosis and ankylosing spondylitis, its efficacy in these diseases is still uncertain. Cyclophosphamide is sometimes used to treat lupus nephritis, a common symptom of systemic lupus erythematosus. Dexamethasone along with either bortezomib or melphalan is commonly used as a treatment for AL amyloidosis. Recently, bortezomid in combination with cyclophosphamide and dexamethasone has also shown promise as a treatment for AL amyloidosis. Other drugs used to treat myeloma such as lenalidomide have shown promise in treating AL amyloidosis. Chemotherapy drugs are also used in conditioning regimens prior to bone marrow transplant (hematopoietic stem cell transplant). Conditioning regimens are used to suppress the recipient's immune system in order to allow a transplant to engraft.
=== Possible exception === Although not sanctioned by IUPAC, uranocene, with two cyclooctatetraene rings sandwiching a uranium atom is sometimes classified as a metallocene. Some "metallocene" complexes of actinides have been reported where there are three cyclopentadienyl ligands for a monometallic complex, all three of them bound η5. In barocene (Cp2Ba) and manganocene, the aromatic rings are not parallel Titanocene dichloride (Cp2TiCl2) is yet another common violation of the IUPAC guidelines.
== Transportation == UPS operates over 119,000 delivery vehicles worldwide, ranging from bicycles to tractor-trailer trucks. In a long-running company policy to avoid advertisement or endorsement of a vehicle manufacturer, all external manufacturer emblems and badging are removed when a vehicle enters service (whenever possible). The typical lifespan of a UPS ground vehicle is 20–25 years (or more), lasting until the structural integrity is compromised. The company does not re-sell any of its ground vehicles. As such, retired vehicles are almost always stripped of reusable parts before being sent to be crushed/broken up. Prior to scrapping, UPS trucks and trailers have all company branding painted over and are assigned an ADA (Automotive Destruction Authorization) number and must be crushed under the supervision of UPS Automotive personnel, which records the vehicle's destruction. The only exception to this policy are vehicles taken off the road for internal company use; package cars (repainted white) are used for various purposes (typically at large hubs); older semi tractors sometimes see use as terminal tractors.
On July 21, 1945, Second Lieutenant Mario López Portillo along with another pilot from 311th Squadron crashed into a mountain nearby, dying in the process. The casualties of these pilots would be a serious blow to 201st Squadron, meanwhile, the fifth force moved to Okinawa to continue harassment attacks on the Japanese. The Mexican Expeditionary Air Force was assigned to the service group of 311th Squadron, and on August 24, it carried out an escort mission to a convoy north of the Philippine Sea to prevent Japanese attacks. After intense fighting and losing companions, the mission had been accomplished. The atomic bombings of the cities of Hiroshima and Nagasaki occurred on the 6th and 9th of August, 1945. Given these attacks, further losses on all fronts, and the Soviet invasion of Manchuria also on August 9, the Empire of Japan finally offered its unconditional surrender on August 15, 1945, which was formalized with a solemn signature on September 2 in Tokyo Bay. During their involvement in the war, Mexican troops were credited with putting 30,000 Japanese soldiers out of action and destroying held buildings, vehicles, tanks, anti-aircraft machine guns, emplaced machine guns, and ammunition depots. Douglas MacArthur, Supreme Command Allied Forces in Southwest Pacific Area, was impressed with the work performed by the squadron. Years later, it was announced that the Mexican troops were going to combat in the European Theater.
Sources: en.wikipedia.org
Mass spectrometry provides the identity check, because the observed mass is compared with the theoretical mass of the AEDG sequence. Chromatography separates and quantifies impurities but does not by itself prove which peptide is present. The two techniques are normally used together.
Yes. Trifluoroacetate and acetate ions remain associated with the peptide after purification, so a weighed quantity of powder contains less peptide than the nominal mass suggests. Certificates that report net peptide content rather than raw weight are more directly comparable between suppliers.
Dilute aqueous solutions are less stable than the dry powder and are usually aliquoted and frozen to avoid repeated freeze–thaw cycles. Lyophilised material is best stored desiccated at −20 °C, protected from light. Working solutions are typically prepared fresh from a frozen aliquot.
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.