If you have been reading about heptapeptide and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-05-18. Numbers and descriptions here follow the published literature rather than marketing material.
Animal studies have examined behaviour in tests of anxiety, memory retention and stress response, and several report changes in neurotrophic or neurotransmitter-related markers. The human evidence base is much smaller, consisting mainly of short trials conducted in Russia with limited reporting in English-language journals. Sample sizes are modest and outcome measures vary between studies, so the findings are best described as preliminary. Independent replication under modern trial standards has not been widely reported.
Outside its country of origin the compound is generally handled as a research chemical rather than an approved medicine. No regulatory approval from the United States Food and Drug Administration or the European Medicines Agency has been granted for human use. Identity and purity are normally checked by reverse-phase high-performance liquid chromatography, with mass spectrometry used to confirm the molecular mass. Lyophilised material is stored cold and desiccated, and repeated freeze-thaw cycles are avoided.
Published clinical evidence is limited. Most controlled trials were conducted in Russia, enrolled modest numbers of participants, and appeared in Russian-language journals, which restricts independent verification. Reported outcomes include lower anxiety scores, improved attention and memory measures, and changes in fatigue ratings. Reviews written in English note methodological limitations such as small samples and inconsistent endpoints. Whether the compound produces clinically meaningful benefit relative to established anxiolytics is therefore an open question rather than an established finding.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences as a structural analogue of tuftsin, a naturally occurring tetrapeptide fragment of the immunoglobulin heavy chain. The added Pro-Gly-Pro tail was intended to slow enzymatic degradation and extend biological activity. In Russia it is registered as an anxiolytic nasal preparation, while regulators elsewhere have not approved it for clinical use.
Proposed mechanisms centre on modulation of the GABAergic system, with reports of altered expression of genes related to GABA-A receptor subunits and changed monoamine turnover. Some studies describe inhibition of enkephalinase, the enzyme that degrades endogenous enkephalins, which may prolong opioid peptide signalling. Effects on brain-derived neurotrophic factor and on cytokine expression have also been reported. These findings come largely from animal models and small human studies, and the precise primary target remains unresolved.
| Property | Value | Notes |
|---|---|---|
| Common route | Intranasal | Also injected in some animal work |
| Solubility class | Freely soluble in water | Solid form is hygroscopic |
| Typical storage | About -20 degrees Celsius | Keep desiccated and dark |
| Purity method | Reverse-phase HPLC | Reported as area percent |
| Confirmatory method | Mass spectrometry | Verifies expected molecular mass |
Reported pharmacological effects center on reduced anxiety-like behavior in animal models and on measures of memory and learning. Proposed contributing mechanisms include modulation of GABAergic signaling, shifts in monoamine turnover, and changes in the activity of enzymes that degrade neuropeptides. Effects on the expression of genes linked to neuroplasticity have also been described. No single molecular target is widely accepted, and whether the behavioral findings arise from one pathway or several remains an open question.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was designed as a stabilized analogue of tuftsin, a naturally occurring tetrapeptide fragment derived from the immunoglobulin heavy chain. The additional Pro-Gly-Pro segment at the carboxyl terminus is intended to slow enzymatic cleavage. The compound is usually described in the literature as a synthetic peptide with anxiolytic and cognitive-related activity, a label that reflects a research context rather than an approved therapeutic category.
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.
Essentially, making it difficult for a clinician to use troponin elevation diagnostically in this patient group. After stenting and related PCI procedures, troponin levels do return to standard levels once the stent has 'settled' and is no longer causing localized cardiac muscle inflammation. In patients with non-severe asymptomatic aortic valve stenosis and no overt coronary artery disease, the increased troponin T (above 14 pg/mL) was found associated with an increased 5-year event rate of ischemic cardiac events (myocardial infarction, percutaneous coronary intervention, or coronary artery bypass surgery). Troponins are also increased in patients with heart failure, where they also predict mortality and ventricular rhythm abnormalities. They can rise in inflammatory conditions such as myocarditis and pericarditis with heart muscle involvement (which is then termed myopericarditis). Troponins can also indicate several forms of cardiomyopathy, such as dilated cardiomyopathy, hypertrophic cardiomyopathy or (left) ventricular hypertrophy, peripartum cardiomyopathy, Takotsubo cardiomyopathy, or infiltrative disorders such as cardiac amyloidosis. Heart injury with increased troponins also occurs in cardiac contusion, defibrillation and internal or external cardioversion. Troponins are commonly increased in several procedures such as cardiac surgery and heart transplantation, closure of atrial septal defects, percutaneous coronary intervention, or radiofrequency ablation.
Bhagat Singh Thind stands as a significant milestone in U.S. legal history, shedding light on the intricate intersections of immigration, citizenship, and racial identity. It serves as a poignant reminder of the biases entrenched within immigration laws and the complexities of racial classifications in American society.
Arthrogryposis multiplex due to muscular dystrophy. Arthrogryposis ectodermal dysplasia other anomalies, also known as Cote Adamopoulos Pantelakis syndrome, Trichooculodermovertebral syndrome, TODV syndrome and Alves syndrome. Arthrogryposis epileptic seizures migrational brain disorder. Arthrogryposis IUGR thoracic dystrophy, also known as Van Bervliet syndrome. Arthrogryposis-like disorder, also known as Kuskokwim disease. Arthrogryposis-like hand anomaly and sensorineural deafness. Arthrogryposis multiplex congenita CNS calcification. Arthrogryposis multiplex congenita distal (AMCD), also known as X-linked spinal muscular atrophy type 2. Gordon syndrome, also known as distal arthrogryposis type 3. Arthrogryposis multiplex congenita, distal type 2A, also known as Freeman–Sheldon syndrome. Arthrogryposis multiplex congenita, distal type 2B, also known as Sheldon–Hall syndrome. Arthrogryposis multiplex congenita neurogenic type (AMCN). This particular type of AMC has been linked to the AMCN gene on locus 5q35. Arthrogryposis multiplex congenita pulmonary hypoplasia, also with a large number of synonyms. Arthrogryposis multiplex congenita whistling face, also known as Illum syndrome. Arthrogryposis multiplex congenita, distal type 1 (AMCD1). Arthrogryposis multiplex with deafness, inguinal hernias, and early death. This syndrome is suspected to be inherited in an X-linked or autosomal recessive fashion. There were only three reported cases with all three patients dead. Arthrogryposis ophthalmoplegia retinopathy, also known as Oculomelic amyoplasia.
=== Criticism of vaping bans === Vaping is much less harmful than smoking, and critics of vaping bans say that they incentivize people to return to smoking. Such arguments have featured in debates over national and subnational vaping restrictions. In Australia, federal reforms that took effect on 1 July 2024 restricted legal sales of vapes to pharmacies and banned the commercial supply of disposable and non-therapeutic vapes; critics, including industry groups and criminology experts, warned that the restrictions could expand an illicit market for vaping products if demand persisted while legal access narrowed. In the United Kingdom, government impact assessment work and contemporaneous media coverage around the planned 2025 ban on sales of single-use vapes included warnings that some vapers could revert or relapse to smoking tobacco. Subsequent reporting in The BMJ scrutinized widely circulated claims that a disposable-vape ban would result in approximately 200,000 additional smokers. Additionally, San Francisco's chief economist, Ted Egan, when discussing the San Francisco vaping ban said that the city's ban on e-cigarette sales would increase smoking as vapers switch to combustible cigarettes. Critics of smoking bans stress the absurdity of criminalizing the sale of a safer alternative to tobacco while tobacco continues to be legal. In New Zealand, critics responded to a March 2024 ban on disposable e-cigarettes, stating that banning disposables could drive some people return to smoking and encourage a black market for unregulated vaping products.
=== 2016–present: Suspension and move to Melbourne === Hibberd, along with 33 other Essendon players, was found guilty of using a banned performance-enhancing substance, thymosin beta-4, as part of Essendon's sports supplements program during the 2012 season. He and his teammates were initially found not guilty in March 2015 by the AFL Anti-Doping Tribunal, but a guilty verdict was returned in January 2016 after an appeal by the World Anti-Doping Agency. He was suspended for two years which, with backdating, ended in November 2016; as a result, he served approximately fourteen months of his suspension and missed the entire 2016 season. After speculation surrounding whether he would return to Essendon once his suspension was finished, he confirmed in August that he wanted to be traded to another club for a "fresh start" despite being contracted to Essendon until the end of 2017 and he nominated Melbourne as his preferred destination in September. He was officially traded to Melbourne in October.
Sources: en.wikipedia.org
== Activities == The activity in Chromatography spans HPLC, LC/MS, FPLC, MPLC - GC, GC/MS, GPC, GFC - RMN - AA, IR, ICP, UV – SPE. Interchim notably introduced new generation silica chromatography media (UptiSphere that has become a standard worldwide, Strategy, Atoll). The activity in Fine Chemistry deals with compounds libraries (Chirals, Fluorines, Building blocks for Combi-Chemistry) and flash chromatography. Interchim developed a unique flash chromatography system (PuriFlashEvo430 - integrated functions). The activity in BioSciences focuses on Immunodetection, Biochemistry, Electrophoresis and Cell Assays. Interchim manufactures protein assays (BC Assay, Coo Assay), superior fluorescent dyes known as FluoProbes, Cell Assays reagents and kits (i.e. FluoProbes indicators, high sensitive viability assay UptiBlue) and an innovate transfection agent UptiFectin.
The LAL test is a major source of animal product dependence in the biomedical industry, and a challenge to the Three Rs of science in relation to the use of animals in testing. With reports of higher-than anticipated mortality rates it has been considered more ethical to devise alternatives to the test. Since 2003, a recombinant protein substitute for use in the LAL test has been commercially available. Named the recombinant factor C (rFC) assay, it is based on the same Limulus clotting factor C protein, but produced by genetically modified insect cells (the specific factor C sequence used does not necessarily come from the Atlantic horseshoe crab). Instead of emulating the whole clotting pathway, rFC tests let factor C cleave a synthetic fluorogenic substrate, so that the sample lights up when endotoxin activates the factor. Since it does not contain factor G, (1,3)-β-D-glucan will not cause false-positives. As of 2018, available evidence shows that the rFC test is no worse than the LAL test. The adoption of the rFC test was slow, which began to change in 2012 when the US FDA and the European health ministry acknowledged it as an accepted alternative. Its lack of mention in Pharmacopeias remained an issue, as there was no good standard for running the test in production. In 2016, it was added to the European Pharmacopoeia. A patent on rFC also limited adoption until its expiration in 2018.
Any substance, other than food, that is used to prevent, diagnose, treat or relieve symptoms of a disease or abnormal condition. Also refers to a substance that alters mood or body function, or that can be habit-forming or addictive, especially a narcotic. (NCI) Drug–drug interaction
Soy was most likely domesticated 6,000–9,000 years ago in the region between the Yellow River and the Huai River in China. The earliest documented evidence for the use of Glycine of any kind comes from charred plant remains of wild soybean recovered from Jiahu in Henan province, a Neolithic site occupied between 9,000 and 7,800 years ago. An abundance of archaeological charred soybean specimens have been found accumulated around this region. Soybeans became an important crop by the Zhou dynasty (c. 1046–256 BC) in China. According to an ancient Chinese myth, in 2853 BC, the legendary Emperor Shennong of China proclaimed that five plants were sacred: soybeans, rice, wheat, barley, and millet. Early Chinese records mention that soybeans were a gift from the region of the Yangtze River delta and Southeast China. However, there is no archaeological evidence that soybeans were domesticated in southern China, and it appears that soy was unknown there prior to the Han dynasty. The oldest preserved soybeans resembling modern varieties in size and shape were found in archaeological sites in Korea dated about 1000 BC. Radiocarbon dating of soybean samples recovered through flotation during excavations at the Early Mumun period Okbang site in Korea indicated soybeans were cultivated as a food crop in around 1000–900 BC. Soybeans from the Jōmon period in Japan from 3000 BC are also significantly larger than wild varieties. The earliest Japanese textual reference to the soybean is in the classic Kojiki (Records of Ancient Matters), which was completed in 712 CE.
. Carbonyl groups are common to many classes of organic compounds and are also a part of many larger functional groups. 2. An inorganic or organometallic coordination complex with carbon monoxide as a ligand (e.g. a metal carbonyl).
Sources: en.wikipedia.org
=== Parts and cleavages === Transcript variant 1 of PIDD1 mRNA in humans, produces a full-length PIDD1 protein consisting of 910 amino acids, with a molecular weight of about 100 kDa. This protein can be broken down into three parts: a 48 kDa N-terminal fragment called PIDD-N, and two C-terminal fragments, PIDD-C (51 kDa) and PIDD-CC (37 kDa). These cleavages occur at positions S446 and S588 through an autoproteolytic process that resembles proteins like inteins or nucleoporin Nup98 undergo self-cleavage. These proteins contain a conserved HSF tripeptide framework that enables a hydrophilic attack of the hydroxyl-group within the serine residue on the preceding peptide bond, converting it into an ester bond that is susceptible to cleavage by an additional nucleophile. The cleavage of full-length PIDD1 (FL-PIDD1) into PIDD-C or PIDD-CC seems to occur constitutively, meaning it happens regularly, which makes FL-PIDD1 levels remain low even when p53 is activated. However, the observation that PIDD-C accumulates before PIDD-CC in response to DNA damage supports the idea that PIDD-C is the primary form generated from FL-PIDD1.
==== Main link ==== The DisplayPort main link is used for transmission of video and audio. The main link consists of a number of unidirectional serial data channels which operate concurrently, called lanes. A standard DisplayPort connection has 4 lanes, though some applications of DisplayPort implement more, such as the Thunderbolt 3 interface which implements up to 8 lanes of DisplayPort. In a standard DisplayPort connection, each lane has a dedicated set of twisted-pair wires, and transmits data across it using differential signaling. This is a self-clocking system, so no dedicated clock signal channel is necessary. Unlike DVI and HDMI, which vary their transmission speed to the exact rate required for the specific video format, DisplayPort only operates at a few specific speeds; any excess bits in the transmission are filled with "stuffing symbols". In DisplayPort versions 1.0–1.4a, the data is encoded using ANSI 8b/10b encoding prior to transmission. With this scheme, only 8 out of every 10 transmitted bits represent data; the extra bits are used for DC balancing (ensuring a roughly equal number of 1s and 0s). As a result, the rate at which data can be transmitted is only 80% of the physical bitrate. The transmission speeds are also sometimes expressed in terms of the "Link Symbol Rate", which is the rate at which these 8b/10b-encoded symbols are transmitted (i.e. the rate at which groups of 10 bits are transmitted, 8 of which represent data). The following transmission modes are defined in version 1.0–1.4a:
== Reading == Cook, T. R.; Zheng, Y.; Stang, P. J. (2013). "Metal-organic frameworks and self-assembled supramolecular coordination complexes: Comparing and contrasting the design, synthesis, and functionality of metal-organic materials". Chem. Rev. 113 (1): 734–77. doi:10.1021/cr3002824. PMC 3764682. PMID 23121121.{{cite journal}}: CS1 maint: multiple names: authors list (link) Desiraju, G. R. (2013). "Crystal engineering: From molecule to crystal". J. Am. Chem. Soc. 135 (27): 9952–67. Bibcode:2013JAChS.135.9952D. doi:10.1021/ja403264c. PMID 23750552. Seto, C. T.; Whitesides, G. M. (1993). "Molecular self-assembly through hydrogen bonding: Supramolecular aggregates based on the cyanuric acid-melamine lattice". J. Am. Chem. Soc. 115 (3): 905–916. Bibcode:1993JAChS.115..905S. doi:10.1021/ja00056a014.{{cite journal}}: CS1 maint: multiple names: authors list (link)
=== Pheochromocytoma === Metirosine is primarily used to reduce these symptoms in patients with pheochromocytoma. It is contraindicated for the treatment of essential hypertension. Pheochromocytoma is a rare neuroendocrine tumor that results in the release of too much epinephrine and norepinephrine, hormones that control heart rate, metabolism, and blood pressure. AMPT was used in the 1960s for preoperative pharmacological control of catecholamine overexpression that causes hypertension and other arterial and cardiac abnormalities. The use of AMPT to treat Pheochromocytoma prior to surgery was discontinued due to its extensive side effects.
Sources: en.wikipedia.org
Most published work uses intranasal application, either as drops or as a nasal spray. Injection routes appear in a smaller set of animal experiments. Oral use is uncommon in the literature because peptide breakdown and poor absorption limit this route.
Reported human trials are few, brief and originate mainly from one country. They describe effects on anxiety-related measures, but sample sizes are small and reporting is limited. The results are widely regarded as preliminary rather than confirmed.
Reverse-phase liquid chromatography is used to assess purity and separation of related impurities. Mass spectrometry confirms that the observed molecular mass matches the expected peptide. A certificate of analysis from the supplier is the usual document of record.
It is a seven-amino-acid peptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, produced by chemical synthesis rather than extracted from biological tissue. Its design is based on tuftsin, a natural immunomodulatory tetrapeptide. The C-terminal Pro-Gly-Pro segment is a common stabilising motif in short regulatory peptides.