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 2025-10-13 and is reviewed periodically as new material appears.
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.
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.
Epitalon is a synthetic tetrapeptide with the residue sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its monoisotopic mass is approximately 390.35 daltons, and it is usually supplied as a lyophilised trifluoroacetate or acetate salt. The compound was derived from a pineal gland extract called epithalamin, a heterogeneous preparation investigated in the former Soviet Union. Researchers associated with the Saint Petersburg Institute of Bioregulation and Gerontology described the tetrapeptide as a constituent fragment of that extract. Commercial material is offered as a laboratory reagent rather than as a finished pharmaceutical product.
Literature searches for this compound must account for several spelling variants. Indexing databases contain epitalon, epithalon, epithalone, and AEDG, and relevant records are scattered across Russian-language and English-language journals that do not consistently cross-cite. Early publications describe the parent extract as a mixture of many peptides, whereas later work addresses the single synthetic tetrapeptide. That shift in nomenclature complicates comparison between studies, because extract data and tetrapeptide data are sometimes cited interchangeably. A search strategy omitting the alternate spellings will return an incomplete set of references.
| 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 |
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.
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.
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The adrenergic receptors were discovered Henry Hallett Dale in 1906 and the α- and β-adrenergic receptors were differentiated by Raymond P. Ahlquist in 1948. In 1967, the β-adrenergic receptors were further differentiated into the β1- and β2-adrenergic receptors by Alonzo M. Lands. The first beta blocker to be developed was dichloroisoprenaline, based on structural modification of the β-adrenergic receptor agonist isoprenaline (isoproterenol). It was described by C. E. Powell and I. H. Slater in 1958. However, dichloroisoprenaline had significant partial agonism and sympathomimetic activity and hence was not a pure antagonist. James Black and John Stephenson described pronethalol (nethalide; ICI-38,174; Alderlin) as a purely antagonistic beta blocker in 1962. But pronethalol suffered from off-target activity and associated side effects and toxicity. As such, it did not enter widespread use and was soon discontinued. In 1964, Black and colleagues published on propranolol (ICI-45,520; Inderal), which did not have the problems of earlier beta blockers. It was introduced for medical use under the brand name Inderal the same year and became the first widely used beta blocker. Since the introduction of propranolol, there have been three generations of beta blockers with different pharmacological properties, with numerous beta blockers having been developed and introduced for medical use.
Nalfurafine (INN, USAN; brand name Remitch; former developmental code names TRK-820, AC-820, MT-9938) is an antipruritic (anti-itch drug) that is marketed in Japan for the treatment of uremic pruritus in individuals with chronic kidney disease undergoing hemodialysis. It activates the κ-opioid receptor (KOR) and is potent, selective, and centrally active. It was the first selective KOR agonist approved for clinical use. It has also been dubiously referred to as the "first non-narcotic opioid drug" in history.
Comprehensive diet programs, providing counseling and targets for calorie intake, are more efficient than dieting without guidance ("self-help"), although the evidence is very limited. The National Institute for Health and Care Excellence devised a set of essential criteria to be met by commercial weight management organizations to be approved.
Sources: en.wikipedia.org
Amy Beth Schumer (born June 1, 1981) is an American stand-up comedian, actress, writer, producer, and director. Schumer ventured into comedy in the early 2000s before appearing as a contestant on the fifth season of the NBC reality competition series Last Comic Standing in 2007. From 2013 to 2016, she was the creator, co-producer, co-writer, and star of the Comedy Central sketch comedy series Inside Amy Schumer, for which she received a Peabody Award and was nominated for five Primetime Emmy Awards, winning Outstanding Variety Sketch Series in 2015. Schumer wrote and made her film debut in a starring role in Trainwreck (2015) earning a nomination for the Golden Globe Award for Best Actress – Motion Picture Comedy or Musical. She then starred in the comedy films Snatched (2017), and I Feel Pretty (2019). She created, produced and starred in the HBO documentary series Expecting Amy (2020), and the Hulu comedy-drama series Life & Beth (2022–2024). She made her Broadway debut in Steve Martin's Meteor Shower for which she earned a Tony Award nomination for Best Actress in a Play. Schumer has earned two Grammy Award nominations for Best Comedy Album for Amy Schumer: Live at the Apollo, and Best Spoken Word Album for narrating her memoir, The Girl with the Lower Back Tattoo (2016).
=== Sponges === The skeleton of sponges consists of microscopic calcareous or siliceous spicules. The demosponges include 90% of all species of sponges. Their "skeletons" are made of spicules consisting of fibers of the protein spongin, the mineral silica, or both. Where spicules of silica are present, they have a different shape from those in the otherwise similar glass sponges.
It was agreed to by a previous Progressive Conservative government after DynaLIFE appealed AHS's contractual arrangement for provision of lab services with Sonic Healthcare, an Australian company. Sonic would have provided these services in Edmonton and northern Alberta starting in October 2014, but the contract was cancelled through DynaLIFE's successful appeal. The provincial government announced on December 5, 2022, that the public Alberta Precision Laboratories (APL) was going to be replaced by the private, for-profit DynaLIFE in providing community lab services in Alberta's large municipalities. By early January 2023, wait times had increased for blood tests that used to be routine and rapid. A University of Calgary assistant professor in health law questioned DynaLIFE's cut backs on "staffing or hours".
== Role of crotonyl-CoA in transcription == Post-translational modification of histones either by acetylation or crotonylation is important for the active transcription of genes. Histone crotonylation is regulated by the concentration of crotonyl-CoA which can change based on environmental cell conditions or genetic factors.
Angiomas: These are vascular tumours, including haemangioma, lymphangioma, venus varix. Angiomas are difficult to classify as previously they were considered hamartomas, benign tumour-like malformations but there is debate if they are developmental abnormality, true benign tumour or hamartoma, or can be either. Haemangiomas are common in the oral mucosa but can occur in other structures such as salivary glands, and can be congenital or develop in childhood. Congenital lesions can resolve spontaneously (involute) but those that develop later usually continue to slowly grow. They are usually dark red-purple or blue, soft, sometimes fluctuant and painless. They commonly blanch on pressure. Usually solitary, they can occur as part of syndromes such as Sturge–Weber syndrome affecting the trigeminal nerve. They are at risk of trauma with subsequent excessive bleeding, thrombosis or calcification. Lymphangiomas are far less common in the oral mucosa, usually appearing on the tongue, less commonly the lip at birth or in infancy. They are colourless to pale pink and may be nodular projections or resemble "frog spawn" domes. They can cause macroglossia (enlargement of the tongue). Venous varix, like varicose vein, usually appear in older people on the lower lip as a blue-purple lump.
Sources: en.wikipedia.org
The protein in cow's milk is approximately 20% whey and 80% casein. The protein in human milk is approximately 60% whey and 40% casein. The protein fraction in whey constitutes approximately 10% of the total dry solids in whey. This protein is typically a mixture of beta-lactoglobulin (~65%), alpha-lactalbumin (~25%), bovine serum albumin (~8%) (see also serum albumin), and immunoglobulins. The third largest fragment of whey protein isolate derived from sweet whey is glycomacropeptide or GMP. However, GMP lacks the secondary structure necessary for it to be classified as a protein and is considered a long amino acid chain. These peptides are all soluble in water in their native forms.
The tallest and heaviest dinosaur known from good skeletons is Giraffatitan brancai (previously classified as a species of Brachiosaurus). Its remains were discovered in Tanzania between 1907 and 1912. Bones from several similar-sized individuals were incorporated into the skeleton now mounted and on display at the Museum für Naturkunde in Berlin; this mount is 12 meters (39 ft) tall and 21.8 to 22.5 meters (72 to 74 ft) long, and would have belonged to an animal that weighed between 30000 and 60000 kilograms (70000 and 130000 lb). The longest complete dinosaur is the 27 meters (89 ft) long Diplodocus, which was discovered in Wyoming in the United States and displayed in Pittsburgh's Carnegie Museum of Natural History in 1907. The longest dinosaur known from good fossil material is Patagotitan: the skeleton mount in the American Museum of Natural History in New York is 37 meters (121 ft) long. The Museo Municipal Carmen Funes in Plaza Huincul, Argentina, has an Argentinosaurus reconstructed skeleton mount that is 39.7 meters (130 ft) long.
As a standard method for analysis, mass spectrometers have reached other planets and moons. Two were taken to Mars by the Viking program. In early 2005 the Cassini–Huygens mission delivered a specialized GC-MS instrument aboard the Huygens probe through the atmosphere of Titan, the largest moon of the planet Saturn. This instrument analyzed atmospheric samples along its descent trajectory and was able to vaporize and analyze samples of Titan's frozen, hydrocarbon covered surface once the probe had landed. These measurements compare the abundance of isotope(s) of each particle comparatively to earth's natural abundance. Also on board the Cassini–Huygens spacecraft was an ion and neutral mass spectrometer which had been taking measurements of Titan's atmospheric composition as well as the composition of Enceladus' plumes. A Thermal and Evolved Gas Analyzer mass spectrometer was carried by the Mars Phoenix Lander launched in 2007. Mass spectrometers are also widely used in space missions to measure the composition of plasmas. For example, the Cassini spacecraft carried the Cassini Plasma Spectrometer (CAPS), which measured the mass of ions in Saturn's magnetosphere.
=== Bioactive === The first sign of porous silicon as a bioactive material was found in 1995. In the conducted study, it was found that hydroxyapatite growth was occurring on porous silicon areas. It was then suggested that "hydrated microporous Si could be a bioactive form of the semiconductor and suggest that Si itself should be seriously considered for development as a material for widespread in vivo applications." Another paper published the finding that porous silicon may be used a substrate for hydroxyapatite growth either by simple soaking process or laser-liquid-solid interaction process. Since then, in-vitro studies have been conducted to evaluate the interaction of cells with porous silicon. A 1995 study of the interaction of B50 rat hippocampal cells with porous silicon found that B50 cells have clear preference for adhesion to porous silicon over untreated surface. The study indicated that porous silicon can be suitable for cell culturing purposes and can be used to control cell growth pattern.
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 based on epithalamin, a peptide-rich preparation obtained from pineal gland tissue and studied in the former Soviet Union. Researchers later identified the tetrapeptide AEDG as a constituent fragment of that material. Modern supplies are produced by chemical synthesis rather than tissue extraction.