anxiolytic is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-07-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
The compound has a calculated molecular weight near 751.9 daltons and carries a net positive charge at physiological pH because of its arginine residue. It dissolves freely in water and in common aqueous buffers, and typically appears as a white or off-white lyophilized powder. The amide backbone makes the molecule susceptible to peptidases, which limits oral use and favors intranasal or parenteral routes. Nomenclature in the literature varies: the substance is also described by the sequence abbreviation TP-7 and by a Russian trade designation.
Regulatory status differs sharply by region. Selank holds a Russian marketing authorization, where it is supplied mainly as nasal drops, while authorities elsewhere have not approved it for medical use. Material sold internationally is therefore usually labeled as a research chemical rather than a medicine. Peer-reviewed publications come predominantly from Russian laboratories, and sample sizes are generally small. Whether the compound produces comparable effects under independent, well-controlled replication remains an open question that the broader literature has not settled.
Selank is a synthetic heptapeptide developed in Russia as a structural analogue of tuftsin, a naturally occurring immunomodulatory tetrapeptide. Its sequence, Thr-Lys-Pro-Arg-Pro-Gly-Pro, keeps the tuftsin core at the N-terminus and appends a Pro-Gly-Pro tail. Researchers at the Institute of Molecular Genetics in Moscow synthesized the compound during the 1990s while searching for peptides with combined anxiolytic and immunomodulatory activity. The added tail was intended to resist enzymatic cleavage and prolong the molecule's presence in circulation.
Clinical evidence comes mainly from small studies conducted in Russia, several of which were open-label or lacked robust blinding. Reported outcomes include lower anxiety scores, changes in attention measures, and effects on asthenic states following illness. Sample sizes are typically in the tens of participants, and independent replication outside the region is scarce. Reviews published in English generally note the limited methodological quality of the underlying trials. Whether the compound produces clinically meaningful effects under rigorous conditions remains unresolved.
Proposed mechanisms center on modulation of the GABA system, but no single molecular target has been confirmed. Rodent studies report changes in GABA-A receptor expression and in the turnover of serotonin, dopamine, and norepinephrine in several brain regions. Increases in brain-derived neurotrophic factor and its receptor have also been described after repeated administration. These findings come largely from animal models, and the degree to which they describe human neurochemistry remains an open question. The mechanism is best characterized as multi-system and not fully resolved.
Pharmacokinetic data are limited. Like most short peptides, Selank is vulnerable to plasma and tissue peptidases, and its measured half-life in circulation is short, on a minutes scale. The Pro-Gly-Pro tail slows this degradation but does not eliminate it. Intranasal administration is the route described in most reports, with absorption through the nasal mucosa and a hypothesized path into the central nervous system that avoids the blood-brain barrier. Direct measurements of human brain exposure are unavailable, so distribution claims rest on inference from animal work.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analog of the tetrapeptide tuftsin |
| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro | Reported consistently across pharmacopoeial descriptions |
| Appearance | White to off-white lyophilized powder | Typical form of research-grade material |
| Solubility | Freely soluble in water | Aqueous buffers; poor in nonpolar solvents |
| Typical storage temperature | -20 degrees Celsius | Lyophilized powder; protect from moisture |
Tuftsin, the parent structure, is a naturally occurring immunomodulatory tetrapeptide released from the Fc region of immunoglobulin G by spleen enzymes. Selank extends this four-residue sequence with three additional amino acids. The stated rationale is that the added tail slows enzymatic breakdown and may influence receptor interactions. How the full heptapeptide behaves at the molecular level is not firmly established, and proposed mechanisms often involve indirect modulation of neurotransmitter or immune signaling rather than a single defined target.
Selank is a synthetic heptapeptide developed in Russia. Its sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, a seven-residue chain built around the natural tetrapeptide tuftsin. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences first described the compound in the mid-1990s. The design combined the tuftsin core with an added Pro-Gly-Pro tail, a modification intended to extend the molecule's stability in biological fluids. Published work on the peptide has appeared mainly in Russian-language journals.
Dry powder is normally held at -20 degrees Celsius or lower, in a sealed container with desiccant and protection from light. Reconstituted solutions are usually kept at 2 to 8 degrees Celsius for short periods and frozen for longer ones. Proline residues at several positions are generally associated with some resistance to peptidase attack, but chemical stability still declines at neutral to alkaline pH and at elevated temperature. Exact shelf-life figures are product-specific and are not standardised across suppliers.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, with mass spectrometry used to confirm molecular mass and sequence information. Amino acid analysis and peptide mapping may supplement these methods. Certified reference standards are scarce, and many commercial lots are sold as research chemicals without a pharmacopoeial monograph. Regulatory treatment differs by country: Selank is a registered prescription medicine in Russia, while in the European Union and the United States it is not an approved drug and may fall under research-chemical or unapproved-product frameworks.
Selank is a hydrophilic peptide and dissolves readily in water and in aqueous buffers. The lyophilised powder is typically a white to off-white solid. Because short peptides are prone to hydrolysis and oxidation, handling benefits from limiting exposure to heat, moisture and strong light. Working solutions are commonly prepared in sterile water or saline, and repeated freeze-thaw cycles are avoided to reduce aggregation and loss of activity. These practices reflect general laboratory convention rather than published stability specifications.
Lyophilized selank is normally supplied as a dry powder and is considered stable for extended periods when kept cold and dry. Moisture uptake is the main practical threat, because absorbed water promotes both hydrolysis and aggregation in the solid state. Vials are usually warmed to room temperature before opening so that condensation does not form on the powder. Supplier documentation commonly specifies -20 °C for routine storage, with -80 °C used for material intended to be archived for years.
Once dissolved, the peptide is markedly less stable than the dry powder. Aqueous solutions are subject to backbone hydrolysis and to microbial growth when they are handled without sterile technique. Buffered solutions near neutral pH are common for short-term laboratory work, while acidic conditions are sometimes used to improve solubility. Analytical laboratories generally prepare working solutions fresh rather than storing them, and a residual water film left in a reopened vial can seed degradation even when the container appears dry.
The Dharampal Satyapal Group (DS Group) is a privately held Indian FMCG conglomerate. Established in 1929, and headquartered in Noida, Uttar Pradesh. The company operates across multiple sectors including food and beverages, confectionery, tobacco, hospitality, and luxury retail.
=== September === September 15, 2011 Canada The St. Thomas Assembly plant was closed permanently after decades of providing employing to the region of St. Thomas, Ontario; resulting in the loss of roughly 1,400 good-paying jobs.
=== Kidney === Regenerative capacity of the kidney has been recently explored. The basic functional and structural unit of the kidney is nephron, which is mainly composed of four components: the glomerulus, tubules, the collecting duct and peritubular capillaries. The regenerative capacity of the mammalian kidney is limited compared to that of lower vertebrates. In the mammalian kidney, the regeneration of the tubular component following an acute injury is well known. Recently regeneration of the glomerulus has also been documented. Following an acute injury, the proximal tubule is damaged more, and the injured epithelial cells slough off the basement membrane of the nephron. The surviving epithelial cells, however, undergo migration, dedifferentiation, proliferation, and redifferentiation to replenish the epithelial lining of the proximal tubule after injury. Recently, the presence and participation of kidney stem cells in the tubular regeneration has been shown. However, the concept of kidney stem cells is currently emerging. In addition to the surviving tubular epithelial cells and kidney stem cells, the bone marrow stem cells have also been shown to participate in regeneration of the proximal tubule, however, the mechanisms remain controversial. Studies examining the capacity of bone marrow stem cells to differentiate into renal cells are emerging. Like other organs, the kidney is also known to regenerate completely in lower vertebrates such as fish. Some of the known fish that show remarkable capacity of kidney regeneration are goldfish, skates, rays, and sharks.
Historically, Japanese consumption of animal products primarily focused on seafood. Influenced by Buddhist precepts against killing (sesshō) and the Shinto reverence for rice cultivation, meat from mammals and birds was often considered impure (kegare) and rarely eaten. Although domesticated chickens arrived in Japan during the Yayoi period, imperial edicts, such as those by Emperor Tenmu and Emperor Shōmu, forbade the killing and eating of certain animals, including chickens, and eggs were likely avoided as well. During the Sengoku period and Edo period, contact with Europeans, particularly in Western Japan, introduced meat-eating habits and the consumption of eggs. Namban confectionery using eggs, such as castella and bōro, also arrived. An early dish resembling TKG, called Tamago meshi (玉子飯, egg rice), appears in the 1805 cookbook Shirōto Hōchō (素人包丁, Amateur Cooking). It involved pouring beaten egg over cooked rice and steaming it. In 1838, records from the Nabeshima clan (Onji Nikki) mention "Odonburi Namatamago" (御丼 生玉子, bowl of rice [with] raw egg) being served to guests. The first person known to have eaten TKG in its modern, raw form was Kishida Ginkō (1833–1905), a pioneering journalist, around 1877. He reportedly recommended the dish to others. According to a 1927 magazine article describing Ginkō's habits, he seasoned it with salt and chili pepper (bansho). Eggs were a luxury during the food shortages after World War II, but became widely affordable from the 1950s onwards. TKG then gained popularity for its taste and nutritional value.
The emergence of ornithology as a scientific discipline began in the 18th century, when Mark Catesby published his two-volume Natural History of Carolina, Florida, and the Bahama Islands, a landmark work which included 220 hand-painted engravings and was the basis for many of the species Carl Linnaeus described in the 1758 Systema Naturae. Linnaeus' work revolutionised bird taxonomy by assigning every species a binomial name, categorising them into different genera. However, ornithology did not emerge as a specialised science until the Victorian era—with the popularization of natural history, and the collection of natural objects such as bird eggs and skins. This specialization led to the formation in Britain of the British Ornithologists' Union in 1858. In 1859, the members founded its journal The Ibis. The sudden spurt in ornithology was also due in part to colonialism. At 100 years later, in 1959, R. E. Moreau noted that ornithology in this period was preoccupied with the geographical distributions of various species of birds.
Sources: en.wikipedia.org
Evidence contradicts Neel's hypothesis in studies of the Pima Indians, which suggest that individuals with higher insulin sensitivity tended to have higher weights, whereas those with insulin resistance tended to weigh less on average within this demographic. Modern hypotheses propose that insulin metabolism serves as a socio-ecological adaptation, with insulin serving as the mechanism for allocating energy to different body components and insulin sensitivity being an adaptation to regulate this energy allocation. The Behavioral Switch Hypothesis suggests that insulin resistance leads to two methods of altering reproductive and behavioral strategies. These strategies are termed "r to K" and "soldier to diplomat". The "r to K" strategy involves directing insulin through the placenta to the fetus, resulting in weight gain in the fetus but not the mother, indicating an increase in parental investment (K strategy). In the "soldier to diplomat" strategy, the insensitivity of skeletal muscle to insulin could redirect glucose to the brain, which does not require insulin receptors. This has been shown to enhance cognitive development across various studies.
The biosynthesis of melatonin in animals involves a sequence of enzymatic reactions starting with L-tryptophan, which can be synthesized through the shikimate pathway from chorismate, found in plants, or obtained from protein catabolism. The initial step in the melatonin biosynthesis pathway is the hydroxylation of L-tryptophan's indole ring by the enzyme tryptophan hydroxylase, resulting in the formation of 5-hydroxytryptophan (5-HTP). Subsequently, 5-HTP undergoes decarboxylation, facilitated by pyridoxal phosphate and the enzyme 5-hydroxytryptophan decarboxylase, yielding serotonin. Serotonin, an essential neurotransmitter, is further converted into N-acetylserotonin by the action of serotonin N-acetyltransferase, using acetyl-CoA. The final step in the pathway involves the methylation of N-acetylserotonin's hydroxyl group by hydroxyindole O-methyltransferase, with S-adenosyl methionine as the methyl donor, to produce melatonin. In bacteria, protists, fungi, and plants, the synthesis of melatonin also involves tryptophan as an intermediate but originates indirectly from the shikimate pathway. The pathway commences with D-erythrose 4-phosphate and phosphoenolpyruvate, and in photosynthetic cells, additionally involves carbon dioxide. While the subsequent biosynthetic reactions share similarities with those in animals, there are slight variations in the enzymes involved in the final stages.
=== Role in kidney pathology === Membranous glomerulonephritis is a serious human disease that can be treated with ACTH, which is a known agonist of MC1R. In a rat model of nephritis it was found that treatment with a different agonist of MC1R improved aspects of kidney morphology and reduced proteinuria, which may help explain the benefit of ACTH in humans.
== History == Prosenjit Choudhury was, at the time, a culinary expert at Sayaji Hotels. While working at the hotel, he introduced the concept of live grills similar to Korean barbecue in order to enhance the buffet experience to avoid cold appetisers. This idea proved to be popular and with the support of Sajid Dhanani, the managing director of Sayaji Hotels, Choudhury established the first outlet at Pali Hill in Mumbai, India in 2006. The brand had expanded to cities such as New Delhi and Bengaluru by 2008. After Sajid Dhanani's death in 2012, his brother Kayum Dhanani took over the business. The company opened its 100th outlet in 2018. The company offered its IPO in 2021. The IPO raised ₹453 crore (US$52 million), with ₹180 crore as fresh capital for expansion and debt repayment, and ₹273 crore as an offer for sale by existing investors. The stock was reported to perform poorly, due to factors such as the COVID-19 pandemic's impact on the restaurant market, weakening sales and increased competition. An Indian Express article highlighted how the buffet business was stalling due to new customer trends, affecting the growth of Barbeque Nation. As of 2022, the company owns an 86.57% stake in Red Apple Kitchen Consultancy Private Limited, which manages an Italian restaurant chain, Toscano.
A partial vacuum may be generated by increasing the volume of a container. To continue evacuating a chamber indefinitely without requiring infinite growth, a compartment of the vacuum can be repeatedly closed off, exhausted, and expanded again. This is the principle behind a positive displacement pump, for example the manual water pump. Inside the pump, a mechanism expands a small sealed cavity to reduce its pressure below that of the atmosphere. Because of the pressure differential, some fluid from the chamber (or the well, in our example) is pushed into the pump's small cavity. The pump's cavity is then sealed from the chamber, opened to the atmosphere, and squeezed back to a minute size. More sophisticated systems are used for most industrial applications, but the basic principle of cyclic volume removal is the same:
Sources: en.wikipedia.org
Selank is a synthetic seven-amino-acid peptide modeled on tuftsin, a fragment of the immunoglobulin G heavy chain. It was designed in Russia to combine anxiolytic and immunomodulatory properties in one molecule.
The first four residues of Selank reproduce the tuftsin sequence Thr-Lys-Pro-Arg. A Pro-Gly-Pro extension at the C-terminus was added to slow enzymatic breakdown and extend residence time.
It holds marketing authorization in Russia, where nasal drop formulations are sold. No equivalent approval exists in the European Union, the United States, or most other countries.
Reports describe effects on GABA-A receptor expression, monoamine turnover, and neurotrophic factor levels. These are proposed mechanisms drawn mainly from animal models. No single molecular target has been established.