Telomerase induction 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.
Last reviewed on 2026-05-04. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
（TG:@pojiaai）Epitalon is a synthetic linear tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. It emerged from work on epithalamin, a peptide fraction prepared from bovine pineal tissue, and was designed as a short, chemically defined analogue of that extract. Early publications came mainly from Russian laboratories studying pineal peptides and aging-related endpoints. The compound appears in the literature under several spellings, including epithalon and epithalone, which complicates systematic searching. Its small size makes solid-phase assembly and routine analytical characterization straightforward.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
| 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 |
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.
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.
According to the assessment of Andrey Illarionov, the actions of the peacekeeping battalion commanded by Timerman triggered the hot phase of armed hostilities. In 2017, Timerman said that he got transferred to the 135th Regiment of the 58th Army in Prokhladny, Kabardino-Balkarian Republic in 2007. He knew that the situation was tense in South Ossetia and "Armed hostilities were practiced at the training center at the Sernovodsk training ground." He arrived in South Ossetia on 31 May 2008.
==== Pancreatic beta cells ==== People with Type 1 diabetes lose the function of insulin-producing beta cells within the pancreas. In a 2007 publication of experiments, scientists have been able to coax embryonic stem cells to turn into beta cells in the lab. In theory, if the beta cell is transplanted successfully, they will be able to replace malfunctioning ones in a diabetic patient. There are adverse effects of high glucose concentrations on stem cell therapy, however.
=== Measuring instruments === Many devices are used to measure the pressure in a vacuum, depending on what range of vacuum is needed. Hydrostatic gauges (such as the mercury column manometer) consist of a vertical column of liquid in a tube whose ends are exposed to different pressures. The column will rise or fall until its weight is in equilibrium with the pressure differential between the two ends of the tube. The simplest design is a closed-end U-shaped tube, one side of which is connected to the region of interest. Any fluid can be used, but mercury is preferred for its high density and low vapour pressure. Simple hydrostatic gauges can measure pressures ranging from 1 torr (100 Pa) to above atmospheric. An important variation is the McLeod gauge which isolates a known volume of vacuum and compresses it to multiply the height variation of the liquid column. The McLeod gauge can measure vacuums as high as 10−6 torr (0.1 mPa), which is the lowest direct measurement of pressure that is possible with current technology. Other vacuum gauges can measure lower pressures, but only indirectly by measurement of other pressure-controlled properties. These indirect measurements must be calibrated via a direct measurement, most commonly a McLeod gauge. The kenotometer is a particular type of hydrostatic gauge, typically used in power plants using steam turbines. The kenotometer measures the vacuum in the steam space of the condenser, that is, the exhaust of the last stage of the turbine.
Neanderthals collected non-functional, uniquely-shaped objects, namely shells, fossils, and gems. It is unclear if these objects were simply picked up for their aesthetic qualities, or if some symbolic significance was applied to them. Some shells may have been painted. Gibraltarian palaeoanthropologists Clive and Geraldine Finlayson suggested that Neanderthals used various bird parts as artistic media, especially black feathers. A 2020 study found evidence of a 3-ply cord fragment made from conifer inner-bark fibres at Abri du Maras, France, which can be used to knit light items, such as strings for hanging beads. 115,000-year-old perforated shell beads from Cueva Antón were possibly strung together to make a necklace. There are several instances of nondescript engravings and scratches on flints, bones, pebbles, and stone slabs — as of 2014, 63 purported engravings have been reported from 27 different European and Middle Eastern Lower-to-Middle Palaeolithic sites. It is debated if these were made with symbolic intent. Neanderthals may have produced finger flutings on the walls of La Roche-Cotard over 57,000 years ago. Neanderthals used ochre, a clay earth pigment. It is unclear if this constitutes evidence of artmaking because, while modern humans have used red ochre for decorative or symbolic colouration, they have also used ochre as medicine, hide tanning agent, food preservative, and insect repellent.
Nuclear warfare and weapons are staple elements of speculative fiction. The War Game by Peter Watkins is a docudrama depicting a hypothetical nuclear attack on Britain. Fail Safe, directed by Sidney Lumet, is a 1964 Cold War techno-thriller presenting a dramatization of an unintended nuclear escalation triggered by a mechanical failure.
Sources: en.wikipedia.org
RB-101 is a drug that acts as an enkephalinase inhibitor, which is used in scientific research. RB-101 is a prodrug which acts by splitting at the disulfide bond once inside the brain, to form two selective enzyme inhibitors and blocking both types of the zinc-metallopeptidase enkephalinase enzymes. This inhibits the breakdown of the endogenous opioid peptides known as enkephalins. These two enzymes, aminopeptidase N (APN) and neutral endopeptidase 24.11 (NEP), are responsible for the breakdown of both kinds of enkephalin naturally found in the body, and so RB-101 causes a buildup of both Met-enkephalin and Leu-enkephalin. These peptides act primarily at the delta opioid receptor, although they also stimulate the mu opioid receptor to some extent through a delta-opioid receptor mediated interaction with another peptide cholecystokinin, and the enzyme-inhibiting effects of RB-101 thus produce indirect stimulation of both of these opioid receptor subtypes. This causes RB-101 to be strongly synergistic with cholecystokinin antagonists, such as proglumide. Unlike the more commonly used enkephalinase inhibitor racecadotril, which only acts peripherally and has antidiarrheal effects, RB-101 is able to enter the brain, and thus produces a range of effects, acting as an analgesic, anxiolytic and antidepressant. The antidepressant and anxiolytic actions are thought to be mediated through the delta opioid receptor, while the analgesic effects most likely result from a mix of mu and delta activity.
Aryl nitriles can be synthesized via the Sandmeyer reaction of diazonium salts with copper(I) cyanide or by the Rosenmund-von Braun reaction (direct reaction of an aryl bromide with copper(I) cyanide). Conversion of thiocyanate with aromatic carboxylic acids, known as Letts nitrile synthesis, can be carried out using potassium thiocyanate; lead thiocyanate generally provides higher yields. Aryl iodides can be converted into aromatic nitriles under palladium catalysis with trimethylsilyl cyanide. For example, iodobenzene reacts with trimethylsilyl cyanide in the presence of tetrakis(triphenylphosphine)palladium(0) (Pd(PPh3)4) to form benzonitrile. Another palladium-catalyzed route (also employing Pd(PPh3)4) is the decarbonylation of aromatic acyl cyanides. Palladium-catalyzed cyanation of aryl chlorides with potassium cyanide or potassium hexacyanidoferrate(II) has likewise been reported. Quinones can react with trimethylsilyl cyanide to give silylated cyanohydrins, which are subsequently aromatized using phosphorus tribromide. A further approach involves reaction of aryl Grignard or aryllithium reagents with dimethylmalonitrile. Aromatic nitriles are often prepared in the laboratory from the aniline via diazonium compounds. This is the Sandmeyer reaction. It requires transition metal cyanides.
A cream is an emulsion of oil and water in approximately equal proportions. It penetrates the stratum corneum outer layer of skin wall. Cream is thicker than lotion, and maintains its shape when removed from its container. It tends to be moderate in moisturizing tendency. For topical steroid products, oil-in-water emulsions are common. Creams have a significant risk of causing immunological sensitization due to preservatives and have a high rate of acceptance by patients. There is a great variation in ingredients, composition, pH, and tolerance among generic brands.
== Research == The UNC School of Medicine operates eleven centers and institutes for research which conduct basic, translational, and clinical work, including the Cell and Molecular Physiology and Genetics Department, the Marsico Lung Institute, and the Lineberger Cancer Research Center. Much of the School's research is conducted in collaboration with other UNC schools and programs, including the UNC Eshelman School of Pharmacy and the UNC Gillings School of Global Public Health. There are also many collaborations between UNC and nearby universities, including Duke University and North Carolina State University. The latter partnership led to the creation of the Lampe Joint Department for Biomedical Engineering, a shared department focused on biomedical engineering and innovation founded in 2003. In 2024, the school received US$649 million in research funding, approximately 74% of which came from the National Institutes of Health. Two researchers at UNC have been awarded Nobel Prizes: Oliver Smithies (2007 Nobel Prize in Medicine or Physiology) for his work on gene targeting and knockout mice, and Aziz Sancar (2015 Nobel Prize in Chemistry) for his work mapping the cellular mechanisms responsible for DNA repair.
Sources: en.wikipedia.org
==== Fc regions ==== Fc's ability to bind Fc receptors is important because it allows antibodies to activate the immune system. Fc regions are varied: they exist in numerous subtypes and can be further modified, for example with the addition of sugars in a process called glycosylation. Changes in the Fc region can alter an antibody's ability to engage Fc receptors and, by extension, will determine the type of immune response that the antibody triggers. For example, immune checkpoint blockers targeting PD-1 are antibodies designed to bind PD-1 expressed by T cells and reactivate these cells to eliminate tumors. Anti-PD-1 drugs contain not only a Fab region that binds PD-1 but also an Fc region. Experimental work indicates that the Fc portion of cancer immunotherapy drugs can affect the outcome of treatment. For example, anti-PD-1 drugs with Fc regions that bind inhibitory Fc receptors can have decreased therapeutic efficacy. Imaging studies have further shown that the Fc region of anti-PD-1 drugs can bind Fc receptors expressed by tumor-associated macrophages. This process removes the drugs from their intended targets (i.e. PD-1 molecules expressed on the surface of T cells) and limits therapeutic efficacy. Furthermore, antibodies targeting the co-stimulatory protein CD40 require engagement with selective Fc receptors for optimal therapeutic efficacy. Together, these studies underscore the importance of Fc status in antibody-based immune checkpoint targeting strategies.
Some methods of creating a trophy mount do not involve preserving the actual body of the animal. Instead, detailed photos and measurements are taken of the animal so a taxidermist can create an exact replica in resin or fiberglass that can be displayed in place of the real animal. No animals are killed in the creation of this type of trophy mount. One situation where this is practiced is in the world of sport fishing where catch and release is becoming increasingly prevalent. Reproduction mounts are commonly created for (among others) trout, bass, and large saltwater species such as the swordfish and blue marlin. Another situation where reproduction trophies are created is when endangered species are involved. Endangered and protected species, such as the rhinoceros, are hunted with rifles loaded with tranquilizer darts rather than real bullets. While the animal is unconscious, the hunter poses for photos with the animal while it is measured for the purpose of creating a replica, or to establish what size of prefabricated fiberglass trophy head can be purchased to most closely approximate the actual animal. The darted animal is not harmed. The hunter then displays the fiberglass head on the wall in lieu of the real animal's head to commemorate the experience of the hunt.
Electrospray ionization is the ion source of choice to couple liquid chromatography with mass spectrometry (LC-MS). The analysis can be performed online, by feeding the liquid eluting from the LC column directly to an electrospray, or offline, by collecting fractions to be later analyzed in a classical nanoelectrospray-mass spectrometry setup. Among the numerous operating parameters in ESI-MS, for proteins, the electrospray voltage has been identified as an important parameter to consider in ESI LC/MS gradient elution. The effect of various solvent compositions (such as TFA or ammonium acetate, or supercharging reagents, or derivitizing groups) or spraying conditions on electrospray-LCMS spectra and/or nanoESI-MS spectra. have been studied.
== Research == As of 2025, the department has 162 researchers, including 110 post-graduate researchers, 50 postdoctoral researchers and 49 research groups. Research spans four divisions including cellular and molecular pathology, immunology, microbiology and parasitology and virology.
A 2018 meta-analysis found no higher risk of breast cancer with 5α-reductase inhibitors. Sexual and mood side effects, such as erectile dysfunction, loss of libido, depression, and reduced semen volume occur in as many as 4.8% of patients taking 5α-reductase inhibitors including dutasteride. In affected men, semen volume is decreased an average of 30%, with a smaller subgroup of patients also experiencing a decrease of sperm motility of 6 to 12%. Sperm shape and function are unaffected and the impact on male fertility is unknown. These negative effects reverse by 3–4 months after discontinuation of the drug. In a study of 6,729 men with benign prostatic hyperplasia (BPH, a condition where the prostate grows unassociated with cancer), 9% had erectile dysfunction (compared to 5.7% treated with a placebo), 3.3% experienced decreased sex drive (vs 1.6% of placebo), and 1.9% had enlarged breasts (vs 1% of placebo). These effects were noted to resolve over time, with many fewer men reporting any adverse effects by the end of the 4-year study. The rate of discontinuation of the drug due to adverse effects was less than 5%. A subset of men affected by sexual and mood side effects report persistent loss of libido, depression, and erectile dysfunction for several years after discontinuing treatment.
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.
It is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, often abbreviated AEDG. The molecule is linear and contains no modified residues, so it is fully described by its sequence.