Telomerase induction raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-10-28 and is reviewed periodically as new material appears.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Calculated from the four residues with three water losses |
| Molecular mass | About 390.35 g/mol | Monoisotopic mass near 390.14, used for mass-spectrometric identification |
| Peptide sequence | Ala-Glu-Asp-Gly | Single-letter form AEDG; no disulfide bonds or modified residues |
| Appearance | White to off-white solid | Supplied as a dried powder |
| Isoelectric point | Around 4 | Estimated from aspartate and glutamate side-chain pKa values |
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 peptide is a synthetic analogue of epithalamin, a preparation extracted from bovine pineal glands. Investigators sought a short, chemically defined molecule that would reproduce some of the endocrine and gerontological observations attributed to the glandular extract. Proposed mechanisms centre on induction of telomerase activity, an effect reported in cultured human somatic cells in the early 2000s, together with influences on melatonin secretion and neuroendocrine regulation. Those mechanisms remain incompletely characterised, and the reported telomerase response has not been consistently reproduced by independent groups working in comparable systems.
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 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.
Descended from Howard Fisher of the Fisher Brothers, owners of Fisher Body, from 1919 a part of General Motors, she has served as president of the General Motors Foundation and as executive director of global community relations and government relations at GM. She married Representative John Dingell in 1981. She had grown up as a Republican, but became a Democrat soon after marrying Dingell. Their marriage lasted 38 years until her husband's death on February 7, 2019, at the age of 92. Like her husband, she is a Catholic. She is a member of the Democratic National Committee from Michigan and chaired Vice President Al Gore's campaign in Michigan in 2000. In 2004, she also helped secure the Michigan Democratic primary and general election vote for John Kerry in Michigan. In November 2006, Dingell was elected to Wayne State University's board of governors. Dingell and Senator Carl Levin were proponents of moving up Michigan's presidential primary before February 5 in an attempt to garner greater political influence for Michigan during the 2008 Democratic primaries. This resulted in Michigan almost losing its delegates' votes in the Democratic National Convention. When Carl Levin announced his retirement from the U.S. Senate at the end of his term in 2015, Dingell indicated that she was interested in running for his seat. When former Michigan Governor Jennifer Granholm declined to run for the seat, a Politico writer declared Dingell to be one of the front-runners for the Democratic nomination, alongside Representative Gary Peters. She chose not to run, and Peters won the seat.
=== Closure === McDonald's announced on May 23, 2025, that the CosMc's concept would cease operations at all five remaining locations (four in Texas and one in Illinois). The company indicated that starting one month later, the rewards program, mobile ordering and app would no longer function, and rolling closures of the physical locations would begin. Citing learnings from proofs of concepts at the pilot locations, they expect to test some of the most successful beverage concepts at several mainline McDonald's restaurants. CEO Chris Kempczinski stated that the concept was “quarantining the complexity in a stand-alone concept.” He also stated that brand contradiction, absence of experience, and a steep loss in revenue and sales were the reasons why the concept was shutting down.
The decrease of MDMA was thought to be partly due to the seizure of 33 tonnes of sassafras oil, the precursor to MDMA, in Cambodia in June 2008, which could have been used to make 245 million doses of MDMA. According to John Ramsey, a toxicologist at St George's, University of London, the emergence of mephedrone was also related to the UK government banning the benzylpiperazine class of drugs in December 2009. gamma-Butyrolactone (GBL), another previously "legal high", was also banned in August 2009 despite concerns it would be replaced by other drugs. By December 2009, mephedrone was available on at least 31 websites based in the UK, and by March 2010, there were at least 78 online shops, half of which sold amounts of less than 200 grams and half that also sold bulk quantities. The price per gram varied from £9.50 to £14. Between July 2009 and February 2010, UK health professionals accessed the National Poisons Information Service's (NPIS) entry on mephedrone 1664 times and made 157 telephone inquiries; the requests increased month on month over this period. In comparison, over a similar time period, the entries for cocaine and MDMA were accessed approximately 2400 times. After mephedrone was made illegal, the number of inquiries to the NPIS fell substantially, to only 19 in June 2010. Media organisations, including the BBC and The Guardian, incorrectly reported mephedrone was commonly used as a plant fertiliser. In fact, sellers of the drug described it as "plant food" because it was illegal to sell the compound for human consumption.
Abdurozik Savriqul Muhammadroziqi (Tajik: Абдурозиқ Савриқул Муҳаммадрозиқӣ, [æbdurɑˈzɯq sævrɯˈqul muˌɦæmːædrɑzɯˈqiː], born 23 September 2003), known professionally as Abdu Rozik, is a Tajikistani playback singer and social media influencer based in Dubai, UAE. In 2022, he participated in Bigg Boss 16 and later in Laughter Chefs – Unlimited Entertainment 2. As a child, Rozik was diagnosed with dwarfism, a growth hormone deficiency which could be cured with appropriate medical treatment. However, his family could not afford to have him treated, leading to his stunted growth. Due to his family's poverty, Rozik was often out of school. He sang for tips in markets and on streets of Panjakent in Tajikistan; along with his family, Rozik also had a beloved pet cat named Renzo, a British Shorthair, who brought him a lot of joy during difficult times.
Sources: en.wikipedia.org
== Side effects and contraindications == The withdrawal of troglitazone has led to concerns of the other thiazolidinediones also increasing the incidence of hepatitis and potential liver failure, an approximately 1 in 20,000 individual occurrence with troglitazone. Because of this, the FDA recommends two to three month checks of liver enzymes for the first year of thiazolidinedione therapy to check for this rare but potentially catastrophic complication. To date, 2008, the newer thiazolidinediones, rosiglitazone and pioglitazone have been free of this problem. The main side effect of all thiazolidinediones is water retention, leading to edema, generally a problem in less than 5% of individuals, but a big problem for some and potentially, with significant water retention, leading to a decompensation of potentially previously unrecognized heart failure. Therefore, thiazolidinediones should be prescribed with both caution and patient warnings about the potential for water retention/weight gain, especially in patients with decreased ventricular function (NYHA grade III or IV heart failure). Though older studies suggested there may be an increased risk of coronary heart disease and heart attacks with rosiglitazone, pioglitazone treatment, in contrast, has shown significant protection from both micro- and macro-vascular cardiovascular events and plaque progression. These studies led to a period of Food and Drug Administration advisories (2007 – 2013) that, aided by extensive media coverage, led to a substantial decrease in rosiglitazone use.
==== Issue of citizenship ==== The report further stated that Russian citizenship, given to the vast part of Abkhaz and Ossetians can not be considered "legally binding under international law" and "the purportedly naturalised persons from South Ossetia and Abkhazia are not Russian nationals in terms of international law." The commission concluded that Abkhaz and South Ossetians legally were citizens of Georgia since 1993, and had not lost their Georgian citizenship at the time of the conflict. The commission also concluded: "The large-scale naturalisations of residents of South Ossetia and Abkhazia with no other factual connection to Russia must be equated to so-called collective (ex lege) naturalisations of foreign residents", which was prohibited. The commission concluded that the creation of Russian citizens in Georgia massively "may be a basis (or rather a pretext) for military intervention", and would amount as a violation of Georgia's sovereignty. The commission concluded that some parts of the Russian Law on Citizenship violated a territorial sovereignty of Georgia. The commission made conclusions that Russian "passportisation" was a meddling in Georgian affairs and demonstrated that Russia was the bad neighbour. The commission stated that humanitarian obstacles caused by Russia to the residents of Abkhazia and South Ossetia "do not justify the large-scale naturalisation of Georgian citizens." The commission stated that "Russia is not allowed under international law to issue passports directly in South Ossetia and Abkhazia, and to pay pensions there".
==== Disadvantages ==== Low solubility Short half-life Sometimes phospholipid undergoes oxidation and hydrolysis-like reaction Leakage and fusion of encapsulated drug/molecules Production cost is high Fewer stables
=== Treatment process === Preliminary testing, preferably on a like textile, is essential to establish a conservation strategy that effectively stabilizes the object through minimal intervention. Treatment starts with the selection of a compatible adhesive and support substrate. The material options are the same as those used for stitching methods. Silk crepeline is popular because it is more pliable than polyester crepeline (Stabiltex), but paper can also be a suitable support depending on the object. Substrata can be dyed to match the color of the textile being consolidated. Surface preparation involves adhesive application by brush, roller, sponge, or spraying in a fume-extraction booth. The prepared substrate is then placed adhesive side down over the textile and covered with absorbent blotting paper that is pinned or weighted. Methods of affixing the adhesive support to the textile artifact include spatula or flat iron, vacuum hot table, vacuum cold-lining, solvent activation, and direct wet or semi-dry application. For instance, cellulose and starch-coated paper can be activated with steam vapor and applied to the textile through vacuum cold-lining creating a bond with the underlying material.
=== Allergic asthma reactions === Asthma may be atopic (i.e., symptoms triggered by allergens) or non-atopic (i.e., symptoms triggered by non-allergenic factors such as cold air). The studies reported here relate to allergen-induced asthma. Mice fed a diet that lowers their SC-FAs levels and then given intranasal injections of dust mite extract developed dust mite allergy asthma reactions to the injections. Their respiratory tract airways had increased numbers of eosinophils and goblet cells as well as excessive levels of mucus; their lung tissue levels of interleukin-4, interleukin-5, interleukin-13, and interleukin-17A and serum immunoglobulin E levels were elevated; and their airway resistance response to a bronchial challenge test was high. In contrast, mice fed a diet that increased their SC-FAs levels developed less of these responses to the extract. Furthermore, mice on the SC-FA lowering diet that were given propionic acid also had far less of these responses to the mite extract. And, Ffar3 (but not Ffar2) gene knockout mice on the low SF-FA diet did not show rises in their lung airway eosinophil levels in response to the mite extract (this was the only parameter of asthma reported in the knockout studies). These finding implicate propionic acid and FFAR3 in the suppression of asthma allergic reactions to mite extract in mice. A second study investigated the effects that an inulin-rich diet (which raises bodily SC-FA levels) feed to rats had on their offsprings' development of asthma. Pregnant rats were feed a normal or inulin-rich diet for 1 week.
Sources: en.wikipedia.org
An academic discipline – one with academic departments, curricula and degrees; national and international societies; and specialized journals. A scientific field (a branch of science) – widely recognized category of specialized expertise within science, and typically embodies its own terminology and nomenclature. Such a field will usually be represented by one or more scientific journals, where peer-reviewed research is published. There are several chemistry-related scientific journals. A natural science – one that seeks to elucidate the rules that govern the natural world using empirical and scientific method. A physical science – one that studies non-living systems. A biological science – one that studies the role of chemicals and chemical processes in living organisms. See Outline of biochemistry.
In molecular biology, RNA polymerase (abbreviated RNAP or RNApol), or more specifically DNA-directed/dependent RNA polymerase (DdRP), is an enzyme that catalyzes the chemical reactions that synthesize RNA from a DNA template strand. Along with the enzyme helicase, RNAP locally opens the double-stranded DNA so that one strand of the exposed nucleotides can be used as a template for the synthesis of RNA, a process called transcription. A transcription factor and its associated transcription mediator complex must be attached to a DNA binding site called a promoter region before RNAP can initiate the DNA unwinding at that position. RNAP not only initiates RNA transcription, it also guides the nucleotides into position, facilitates attachment and elongation, has intrinsic proofreading and replacement capabilities, and termination recognition capability. RNAP can produce different types of RNA, including: Messenger RNA (mRNA)
What Is Raynaud's Disease at the National Heart, Lung, and Blood Institute Questions and Answers About Raynaud's Phenomenon at the National Institutes of Health Bakst R, Merola JF, Franks AG, Sanchez M (October 2008). "Raynaud's Phenomenon: Pathogenesis and Management". Journal of the American Academy of Dermatology. 59 (4): 633–53. doi:10.1016/j.jaad.2008.06.004. PMID 18656283.
=== Splitting of water === The bound metal ion, plus a glutamate-histidine pair, activates and splits a water molecule from the surrounding solution. This generates a hydroxide ion within the active site.
Sources: en.wikipedia.org
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.
It is not recognised as an endogenous peptide hormone. The four-residue sequence can appear inside larger proteins and in digestive fragments of dietary protein, but no dedicated pathway producing it as a signalling molecule has been identified.
Several cell-culture reports describe increased telomerase activity after treatment, measured by enzyme assays or by transcript levels. Results differ between cell types and laboratories, and measured telomere lengthening has been reported in some studies but not in others, which leaves the physiological relevance open.
It is a synthetic tetrapeptide built from alanine, glutamate, aspartate and glycine. The four residues are joined by standard peptide bonds, giving a linear chain rather than a branched structure.