Everything below concerns Deamidation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-04-15. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Peptides of this size are generally stable as dry solids but degrade in solution over time. The principal routes are hydrolysis of the peptide backbone and oxidation, with hydrolysis favoured by elevated temperature and extreme pH. Aqueous solutions held at room temperature can show measurable loss of purity within days, while frozen aliquots are considerably more durable. Because the sequence contains neither cysteine nor methionine, oxidation is less of a concern than for many other peptides, but pH control during handling still matters.
Typical storage for the lyophilized powder is −20 °C or lower, in a sealed container protected from light and moisture. Hygroscopic material should be allowed to equilibrate to room temperature before the vial is opened, which limits condensation on the contents. Working solutions are commonly divided into single-use aliquots and frozen to avoid repeated freeze-thaw cycles. Dilute solutions are more prone to adsorption onto plastic surfaces and to loss during filtration, so procedures that minimize transfers and use low-binding labware are preferable.
Reversed-phase high-performance liquid chromatography is the standard approach for assessing purity, usually with ultraviolet detection near 214 nm, where the peptide bond absorbs. Mass spectrometry, most often with electrospray ionization, confirms the molecular mass and helps reveal truncation or deletion byproducts. Amino acid analysis can verify composition, and counterion content is sometimes measured because peptides purified with trifluoroacetic acid retain variable amounts of that salt. Purity figures reported without a stated method and detection wavelength are difficult to interpret.
| 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 |
Laboratory-grade epitalon is typically supplied as a lyophilized powder. Purity is commonly assessed with reverse-phase high-performance liquid chromatography, often paired with mass spectrometry to confirm molecular identity. Amino acid analysis and peptide mapping can provide additional confirmation of sequence. Certificates of analysis for research materials frequently report purity above 95 percent, although the methods behind such figures vary between suppliers. The absence of a pharmacopeial monograph means that no single standardized assay defines the compound, so reported results depend on the analytical protocol chosen.
Storage recommendations center on limiting moisture, heat, and light. The dry powder is generally kept at minus 20 degrees Celsius, and some suppliers recommend minus 80 degrees for long-term archival. Once dissolved, solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles, which can promote aggregation or degradation. Aqueous stability depends on pH and concentration, and buffered saline is often preferred over plain water for biological work. Stability data specific to epitalon remain limited, so general peptide-handling practices are applied by analogy rather than from product-specific validation.
Because epitalon has no pharmacopoeial monograph, quality assessment depends on supplier documentation and independent testing. Certificates of analysis typically report a purity figure from a single chromatographic run, a measured mass and sometimes an appearance description, but methods and acceptance criteria are not harmonised across vendors. Third-party laboratories can repeat identity and purity measurements, and mismatches between labelled and measured peptide content have been described for research peptides generally. What constitutes adequate identity confirmation for a molecule of this size stays an open question, since mass agreement alone does not separate closely related sequences.
Identity testing for epitalon relies on reversed-phase high-performance liquid chromatography for purity and mass spectrometry for mass confirmation. Because the sequence contains no tryptophan or tyrosine, ultraviolet detection at 280 nanometres is insensitive, so chromatographic methods usually monitor absorbance near 214 nanometres, where the peptide backbone absorbs. Electrospray ionisation or matrix-assisted laser desorption/ionisation then checks the intact mass against the expected value near 390 daltons. Peptide mapping or amino acid analysis after acid hydrolysis can supplement these measurements, although such confirmatory work is seldom reported on commercial certificates of analysis.
The compound is generally presented as a synthetic fragment of epithalamin, a pineal gland extract investigated in the former Soviet Union from the 1970s onward. Vladimir Khavinson and colleagues in Saint Petersburg developed short peptides modelled on such extracts, and epitalon became the most widely cited of those sequences. Most primary reports appeared in Russian-language journals or in proceedings with limited international circulation. Independent replication in laboratories outside that network remains sparse, and much repeated secondary material traces back to a small number of originating groups.
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.
The Aviation Safety Reporting System (ASRS) collects voluntarily submitted aviation safety incident/situation reports from pilots, controllers and others. The ASRS uses reports to identify system deficiencies, issue alert messages, and produce two publications, CALLBACK, and ASRS Directline. The collected information is made available to the public, and is used by the FAA, NASA and other organizations working in research and flight safety.
Valence 3 is dominant in all subsequent elements up to lawrencium (with the exception of nobelium). Curium can be tetravalent in solids (fluoride, dioxide). Berkelium, along with a valence of +3, also shows the valence of +4, more stable than that of curium; the valence 4 is observed in solid fluoride and dioxide. The stability of Bk4+ in aqueous solution is close to that of Ce4+. Only valence 3 was observed for californium, einsteinium and fermium. The divalent state is proven for mendelevium and nobelium, and in nobelium it is more stable than the trivalent state. Lawrencium shows valence 3 both in solutions and solids. The redox potential
=== Autoimmune disease === This theory hypothesizes that autoantibodies that target the brain or elements of brain metabolism may cause or exacerbate autism. It is related to the maternal infection theory, except that it postulates that the effect is caused by the individual's own antibodies, possibly due to an environmental trigger after birth. It is also related to several other hypothesized causes; for example, viral infection has been hypothesized to cause autism via an autoimmune mechanism. Interactions between the immune system and the nervous system begin early during embryogenesis, and successful neurodevelopment depends on a balanced immune response. It is possible that aberrant immune activity during critical periods of neurodevelopment is part of the mechanism of some forms of autism. A small percentage of autism cases are associated with infection, usually before birth. Results from immune studies have been contradictory. Some abnormalities have been found in specific subgroups, and some of these have been replicated. It is not known whether these abnormalities are relevant to the pathology of autism, for example, by infection or autoimmunity, or whether they are secondary to the disease processes. As autoantibodies are found in diseases other than autism, and are not always present in autism, the relationship between immune disturbances and autism remains unclear and controversial.
== James Bond films == The former War Office building served as the filming location for the MI6 headquarters (M's office) in five James Bond 007 movies. The landmark building appears in Octopussy (1983), A View to a Kill (1985), The Living Daylights (1986), Licence to Kill (1989), Skyfall (2012), and Spectre (2015).
Bland cholestasis occurs when there is obstruction to bile flow in the absence of inflammation or biliary and hepatic injury, whereas these features are present in cholestatic hepatitis.Bland cholestasis is almost always caused by anabolic steroids or estrogen contraceptive use, while many drugs may cause cholestatic hepatitis, including penicillins, sulfonamides, rifampin, cephalosporins, fluoroquinolones, tetracyclines, and methimazole, among others. Antibiotics and antifungals that commonly cause DIC are penicillins, macrolides, trimethoprim/sulfamethoxazole, and tetracyclines. Due to its clavulanic acid component, penicillin amoxicillin-clavulanate is the most common culprit of cholestatic liver injury. Flucloxacillin, which is commonly prescribed in the UK, Sweden, and Australia, is another penicillin frequently implicated in DIC. Cholestasis induced by penicillins usually resolves after withdrawal. Macrolides with cholestatic potential include erythromycin, clarithromycin, and azithromycin, and prognosis is likewise favorable with these drugs. Trimethoprim/sulfamethoxazole (via its sulfonamide component) is the fourth most common antibiotic responsible for DILI in North America. However, DIC is comparatively less common with low-dose tetracyclines like doxycycline. Other cholestatic antimicrobials include the antifungal terbinafine, notable for its potential to cause life-threatening cholestatic injury, and quinolones (ciprofloxacin, levofloxacin), which have been linked to cholestatic hepatitis and vanishing bile duct syndrome.
Sources: en.wikipedia.org
==== NF-κB ==== NF-κB activation is initiated by DAG, the second, membrane bound product of PLCγ hydrolyzation of PIP2. DAG binds and recruits protein kinase C θ (PKCθ) to the membrane where it can activate the membrane bound scaffold protein CARMA1. CARMA1 then undergoes a conformational change which allows it to oligomerize and bind the adapter proteins BCL10, CARD domain and MALT1. This multi-subunit complex binds the ubiquitin ligase TRAF6. Ubiquitination of TRAF6 serves as scaffold to recruit NEMO, IκB kinase (IKK) and TAK1. TAK 1 phosphorylates IKK, which in turn phosphorylates the NF-κB inhibitor I-κB, leading to the ubiquitination and subsequent degradation of I-κB. I-κB blocks the NLS of NF-κB therefore preventing its translocation to the nucleus. Once I-κB is degraded, it cannot bind to NF-κB and the NLS of NF-κB becomes accessible for nuclear translocation.
Abiotrophy (loss in vitality of organ or tissue) Atrophy (reduced functionality of an organ, with decrease in the number or volume of cells) Hypertrophy (increase in the volume of cells or tissues) Hypotrophy (decrease in the volume of cells or tissues) Dystrophy (any degenerative disorder resulting from improper or faulty nutrition) Pseudohypertrophy (false enlargement of muscle)
== Laboratory measurement == The reference range for prothrombin time depends on the analytical method used, but is usually around 12–13 seconds (results should always be interpreted using the reference range from the laboratory that performed the test), and the INR in absence of anticoagulation therapy is 0.8–1.2. The target range for INR in anticoagulant use (e.g. warfarin) is 2 to 3. In some cases, if more intense anticoagulation is thought to be required, the target range may be as high as 2.5–3.5 depending on the indication for anticoagulation.
=== Prescribing restrictions === Isotretinoin is a teratogen; there is about a 20–35% risk for congenital defects in infants exposed to the drug in utero, and about 30–60% of children exposed to isotretinoin prenatally have been reported to show neurocognitive impairment. Because of this risk, there are strict controls prescribing isotretinoin to women who have potential to become (or be) pregnant while taking isotretinoin and many are strongly advised to terminate their pregnancies because of the 20-60% risk. Isotretinoin is also not recommended for use by breastfeeding women. In the United States, since March 2006, the dispensing of isotretinoin is run through the iPLEDGE program, under the direction of the Food and Drug Administration. Prescribers, pharmacists, and all people to whom the drug is prescribed need to register on the site and log information into it. Women with child-bearing potential must commit to using two forms of effective contraception simultaneously for the duration of isotretinoin therapy and for a month immediately preceding and a month immediately following therapy. Additionally, they must have two negative pregnancy tests 30 days apart and have negative pregnancy tests before each prescription is written. In most countries, isotretinoin can only be prescribed by dermatologists or specialist physicians; some countries also allow limited prescriptions by general practitioners and family doctors. In the United Kingdom and Australia, isotretinoin may be prescribed only by or under the supervision of a consultant dermatologist.
Sources: en.wikipedia.org
It was first advertised on television with the jingle "Brylcreem — A Little Dab'll Do Ya! Brylcreem — You'll look so debonair. Brylcreem — The gals'll all pursue ya; they'll love to run their fingers through your hair!". Another version was "Brylcreem—a little dab will do ya! Use more only if you dare; but watch out! The gals will all pursue ya! They'll love to run their fingers through your hair!" The jingle was created by Hanley M. Norins of the Young & Rubicam advertising agency. The television advertisement for Brylcreem included a cartoon animation of a man with (initially) shaggy hair, who happily has a little dab applied, and, miraculously, the hair combs and smooths itself. When the dry look became popular, partly inspired by the unoiled moptops of the Beatles, the last line was changed from "They'll love to run their fingers through your hair", to "They'll love the natural look it gives your hair". Subsequent television advertisements used the mottoes "Grooms without gumming" and later, in the 1970s, in the United Kingdom and Canada, "A little dab of Brylcreem on your hair gives you the Brylcreem bounce".
The band's second album, Powerglide (1972), was the first to feature this line-up. The Powerglide album art included a notable caricature of the band members drawn by Lore Shoberg. 1973's The Adventures of Panama Red included a Nelson-sung cover of Peter Rowan's "Panama Red" that steadily gained traction as an enduring FM radio staple. The album peaked at No. 55 in Billboard and, albeit as a sleeper hit, marked the band's commercial zenith; in 1979, it was certified gold by RIAA. In the mid-1970s, Radio Caroline adopted the song "On My Way Back Home" from the Gypsy Cowboy album as the station's theme tune. The song was well-suited to the station's album-oriented format of the time, and included the lyric "Flying to the sun, sweet Caroline". The New Riders of the Purple Sage continued touring and releasing albums throughout the late 1970s and early 1980s to an increasingly fallow reception; none of the albums that followed New Riders (1976) charted on the Billboard 200 in antipodal contrast to the widespread mainstream success of the outlaw country movement (exemplified by Willie Nelson and Waylon Jennings) and such second-wave country rock groups as The Eagles, Pure Prairie League, and Firefall. The band continued to open several Grateful Dead and Jerry Garcia Band shows in 1977 and 1978, including the final concert preceding the closure of Winterland Ballroom on December 31, 1978.
In a meta analysis looking at many different phytochemical effects on prostate cancer, two specific studies using mice observed [6]-gingerol compounds induced apoptosis in cancer cells by interfering with the mitochondrial membrane. There were also observed mechanisms associated with the disruption of G1 phase proteins to stop the reproduction of cancer cells which is also an associated benefit of other relevant anticancer studies. The main mechanism by which gingerol phytochemicals act on cancer cells seems to be protein disruption. The anti-carcinogenic activity of [6]-gingerol and [6]-paradol was analysed in a study observing the cellular mechanisms associated with mouse skin cancer which targeted the activator proteins associated with tumor initiation. Gingerol compounds inhibited the transformation of normal cells into cancer cells by blocking AP-1 proteins and when cancer did develop paradol encouraged apoptosis due to its cytotoxic activity. [6]-Gingerol exhibits cell cycle arrest capabilities, apoptotic action and enzyme-coupled cell signaling receptor degradation in cancer cells. Gingerol has been observed to stop proliferation through inhibiting the translation of Cyclin proteins necessary for replication during G1 and G2 phase of cell division. To promote apoptosis in cancer cells Cytochrome C is ejected from the mitochondria which ceases ATP production leaving a dysfunctional mitochondria.
This tunnel contains a set of tight binding pockets such that each side chain of the substrate peptide (P6 to P1') is bound in a complementary site (S6 to S1'). In particular, peptide side chain P6-Glu contacts a network of three hydrogen bonds; P5-Asn points into the solvent, making no specific interactions (hence the absence of substrate consensus at this position); P4-Leu is buried in a hydrophobic pocket; P3-Tyr is held in a hydrophobic pocket with a short hydrogen bond at the end; P2-Phe is also surrounded by hydrophobes including the face of the triad histidine; P1-Gln forms four hydrogen bonds; and P1'-Ser is only partly enclosed in a shallow hydrophobic groove.
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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.
The powder is normally kept at −20 °C or below in a sealed, moisture-protected container. Letting the vial reach room temperature before opening helps prevent condensation on the contents.