The short version of tuftsin fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-11-21. Anything still debated is marked as such rather than presented as settled.
Proposed mechanisms centre on the GABAergic system. Animal and tissue studies report changes in GABA-A receptor expression and reduced activity of GABA transaminase, the enzyme that degrades GABA. Effects on monoamine turnover, including serotonin and dopamine pathways, are also described, and a separate line of work links the peptide to increased expression of brain-derived neurotrophic factor in hippocampal tissue. Most of these findings come from rodent models and cell preparations. How the individual observations combine into a single coherent mode of action is not settled.
Pharmacokinetic data are sparse and largely derived from animal work. After intranasal administration the peptide appears in plasma within minutes, and reported half-lives are short, on the order of minutes to tens of minutes. Degradation proceeds through ordinary proteolytic cleavage into constituent amino acids and smaller fragments. Direct evidence that intact Selank reaches brain tissue in meaningful amounts is limited, and the extent of blood-brain barrier penetration is debated. Some authors argue that fragments, not the parent peptide, carry much of the observed activity.
Published clinical work is concentrated in Russian-language journals and generally involves small samples without independent replication. Systematic reviews in English note the shortage of randomised, placebo-controlled trials and the difficulty of verifying methods from translated reports. Outcome measures vary between studies, which complicates pooling of results. Interest in the compound as a cognitive or anxiolytic agent therefore rests on a thinner evidence base than the volume of citations suggests. Replication in well-powered trials with preregistered endpoints would be needed before firm conclusions about efficacy can be drawn.
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.
Most published work on selank originates from a small number of research groups in the Russian Federation. A large share of that record appears in Russian-language journals, which limits access for readers who rely on English-indexed databases. Independent replication by laboratories outside the original research network is sparse in publicly available sources. This concentration of origin and language is a frequently noted feature when the compound is summarized in broader reviews of synthetic peptides.
| Property | Value | Notes |
|---|---|---|
| Primary route studied | Intranasal | Also examined parenterally in animal work |
| Reported plasma half-life | Minutes to tens of minutes | Values vary widely between reports |
| Main model systems | Rodent behavioural and cell assays | Human trials are few and small |
| Principal proposed targets | GABA-A receptor, GABA transaminase | Monoamine and neurotrophic pathways also reported |
| Evidence grade | Preliminary | Limited independent replication |
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.
Reversed-phase high-performance liquid chromatography is the standard technique for estimating peptide purity. The result is a peak-area percentage, which describes how much of the detected material elutes as the main peak in one run. Mass spectrometry confirms the molecular mass and can reveal truncated, adducted, or otherwise modified species. Amino acid analysis or tandem mass spectrometry can address sequence fidelity when identity is in doubt. None of these measurements, taken alone, establishes that a sample is fit for any specific purpose.
Selank is a synthetic heptapeptide developed in Russia during the 1990s. Researchers at the Institute of Molecular Genetics of the Russian Academy of Sciences designed it as a stabilized analog of tuftsin, a naturally occurring immunomodulatory tetrapeptide. The compound has been studied primarily for its reported anxiolytic and nootropic effects. It remains largely unknown in Western pharmacology and is not approved as a medicine by major regulators such as the FDA or the EMA.
The primary structure of Selank is Thr-Lys-Pro-Arg-Pro-Gly-Pro, corresponding to the molecular formula C33H57N11O9 and a monoisotopic mass of roughly 751.9 daltons. The N-terminal threonine and the arginine residue in the fourth position are shared with tuftsin, which carries the sequence Thr-Lys-Pro-Arg. The three additional residues at the C-terminus, Pro-Gly-Pro, extend the chain and are associated with greater resistance to enzymatic degradation. This extension also separates Selank from the shorter parent peptide.
Naming conventions place Selank in the same research family as Semax, another Russian-developed peptide investigated for cognitive effects. The two compounds share a lineage but differ in sequence and in the biological systems proposed as their targets. Semax descends from ACTH fragments, whereas Selank descends from tuftsin. Publications sometimes identify Selank by its full peptide sequence or by laboratory codes rather than one uniform trade name. Because replication outside Russia is limited, reports on its properties are best read alongside the study design and the purity of the material tested.
Characterization of Selank in laboratory settings relies on standard peptide analytical techniques. Reverse-phase high-performance liquid chromatography separates the peptide from related impurities and degradation products, while mass spectrometry confirms molecular identity through accurate mass measurement. Amino acid analysis and peptide sequencing verify the primary structure when reference material is unavailable. Because Selank is a short chain, fragmentation-based analysis produces a diagnostic ion pattern that supports confident identification.
Peptide stability depends strongly on temperature, moisture, and pH. Lyophilized Selank is generally most stable when stored cold and dry, with freezer temperatures commonly used for long-term storage. In solution, the compound is susceptible to hydrolysis and to microbial growth if it is not handled aseptically. The C-terminal proline-rich extension appears to slow enzymatic cleavage relative to tuftsin, though quantitative degradation rates vary with the matrix and the conditions tested. Published stability data specific to Selank remain sparse.
Quality assessment of Selank samples typically combines purity determination with identity confirmation and counter-ion analysis. Purity is usually reported as a percentage by chromatographic area, with values above 95 percent often quoted for research-grade material. Water content and residual solvents are checked in lyophilized batches because they affect both stability and accurate mass determination. A reported purity figure does not by itself establish that a sample is the intended sequence, so orthogonal methods are needed to rule out sequence isomers or truncation products.
There are two tiers of local government covering Wilmslow, at parish (town) and unitary authority level: Wilmslow Town Council and Cheshire East Council. The town council is based at the Parish Hall on Cliff Road.
Directed by Jessie Nelson with musical direction by Lance Horne, the musical was workshopped at the Royal National Theatre and commissioned by the National Theatre Connections. He wrote the music and lyrics to the 2013 musical adaptation of American Psycho, which opened at the Almeida Theatre in London, and was later staged on Broadway in 2016. In 2013, Sheik wrote the music for the musical adaptation of the novel Because of Winn-Dixie, which premiered at the Arkansas Repertory Theatre. Dixie was a collaboration with then-director John Tartaglia and Nell Benjamin, who wrote the book and lyrics. The musical ran at the Goodspeed Opera House in East Haddam, Connecticut from July 2019 to September 2019, directed by John Rando. In 2015, Sheik wrote the musical thriller Noir with Kyle Jarrow. It premiered as part of New York Stage and Film's season in July to August 2015 at the Powerhouse Theater at Vassar College. Inspired by live radio plays and classic film noir, the musical was directed by Rachel Chavkin. In 2016, he prepared the music for the Shakespeare Theatre Company (Washington, D.C.) production of The Taming of the Shrew, described in The Washington Post as "an assortment of preexisting songs by singer-songwriter Duncan Sheik".
The global abundance of 2H in plants is in the following order: phenylpropanoids > carbohydrates > bulk material > hydrolyzable lipids > steroids. In plants, δDs of carbohydrates, which typically range around −70‰ to −140‰, are good indicators of the photosynthetic metabolism. Photosynthetically produced hydrogen which is bound to carbon backbones is ~100‰–170‰ more D-depleted than the water in plant tissues. Heterotrophic processing of carbohydrates involves isomerization of triose phosphates and interconversion between fructose-6-phosphate and glucose-6-phosphate. These cellular processes promote the exchange between organic H and H2O within the plant tissues leading to around 158‰ of D-enrichment of those exchanged sites. The δD of C3 plants such as sugar beet, orange and grape ranges from −132‰ to −117‰, and that of C4 plants such as sugar cane and maize ranges from −91‰ to −75‰. The δD of Crassulacean acid metabolism (CAM) such as pineapple is estimated at around −75‰. Sugar beet and sugar cane contain sucrose, and maize contain glucose. Orange and pineapple are the sources of glucose and fructose. The deuterium content of the sugars from the above plant species are not distinctive. In C3 plants, hydrogen attached to carbons in 4 and 5 positions of the glucose typically comes from NADPH in the photosynthetic pathway, and is found to be more D-enriched. Whereas in C4 plants, hydrogen attached to carbons 1 and 6 positions is more D-enriched. D-enrichment patterns in CAM species tend to be closer to that in C3 species.
Sources: en.wikipedia.org
The cells undergo freeze-drying, the dehydration being the basic cause of freezing injury. The rate of cooling has been shown to influence the frost resistance of tissues, but the actual rate of freezing will depend not only on the cooling rate, but also on the degree of supercooling and the properties of the tissue. Sakai (1979a) demonstrated ice segregation in shoot primordia of Alaskan white and black spruces when cooled slowly to 30 °C to -40 °C. These freeze-dehydrated buds survived immersion in liquid nitrogen when slowly rewarmed. Floral primordia responded similarly. Extraorgan freezing in the primordia accounts for the ability of the hardiest of the boreal conifers to survive winters in regions when air temperatures often fall to -50 °C or lower. The hardiness of the winter buds of such conifers is enhanced by the smallness of the buds, by the evolution of faster translocation of water, and an ability to tolerate intensive freeze dehydration. In boreal species of Picea and Pinus, the frost resistance of 1-year-old seedlings is on a par with mature plants, given similar states of dormancy.
4-HO-MET binds to various serotonin receptors and is known to act as an agonist of the serotonin 5-HT2A, 5-HT2B, 5-HT2C, and 5-HT1A receptors. It is thought that the hallucinogenic effects of serotonergic psychedelics like 4-HO-MET are mediated by serotonin 5-HT2A receptor activation.
==== The Mariam Appeal ==== In 1998, Galloway founded the Mariam Appeal which was intended, according to its website's welcome page in 1999, "to campaign against sanctions on Iraq which are having disastrous effects on the ordinary people of Iraq". The campaign was named after Mariam Hamza, a child flown by the fund from Iraq to Britain to receive treatment for leukaemia. The intention was to raise awareness of the suffering and death of hundreds of thousands of other Iraqi children, due to poor health conditions and lack of suitable medicines and facilities, and to campaign for the lifting of the Iraq sanctions that many maintained were responsible for that situation. In 1999, Galloway was criticised for spending Christmas in Iraq with Tariq Aziz, who was Iraq's Deputy Prime Minister. In a 17 May 2005 hearing of the United States Senate Committee on Homeland Security and Governmental Affairs Permanent Subcommittee on Investigations, Galloway stated that he had many meetings with Aziz, and characterised their relationship as friendly. He said at another occasion that he and Aziz met more than ten times. During the 2003 invasion of Iraq, the fund received scrutiny after a complaint that Galloway used some donated money to pay for his travel expenses. He responded by stating that the expenses were incurred in his capacity as the appeal's chairman. Although the Mariam Appeal was never a registered charity and never intended to be such, it was investigated by the Charity Commission.
On 21 March 2020, Bukele imposed a 30-day nationwide lockdown in an effort to combat the pandemic. During the lockdown, 4,236 people were arrested by the National Civil Police for violating the lockdown order; 70 were arrested before the lockdown order became public. The arrestees were quarantined in a "containment center". Human rights organizations such as Human Rights Watch criticized the arrests, citing instances of arbitrary arrests and abuse by police. Amid April 2020 lockdowns in the country's prisons and published images of prisoners lined up in cramped positions, Human Rights Watch called the prisons' living conditions "inhumane" (particularly in light of the pandemic). On 27 May 2020, the United States donated 250 ventilators to El Salvador. During a press conference where Bukele received the ventilators, he said that he took hydroxychloroquine as prophylaxis and added that "most of the world's leaders use [hydroxychloroquine] as a prophylaxis". Bukele inaugurated the Hospital El Salvador, the largest hospital in Latin America used exclusively for treating cases of COVID-19 at the site of the former International Center for Fairs and Conventions, on 22 June 2020. The hospital had a capacity of 400 beds, 105 intensive-care units, and 295 intermediate-care units staffed by 240 doctors. In August 2020, the hospital's capacity was increased by 575 beds. It began treating conditions other than COVID-19 by June 2022.
Sources: en.wikipedia.org
The neuroendocrine system is an integrated system composed of neurons, glands and non-endocrine tissues, and the hormones and neurochemicals they produce and receive collectively regulate physiological or behavioral state.
== Afferent inputs == The PVN receives afferent inputs from many brain regions and different parts of the body, by hormonal control. Among these, inputs from neurons in structures adjacent to the anterior wall of the third ventricle (the "AV3V region") carry information about the electrolyte composition of the blood, and about circulating concentrations of such hormones as angiotensin and relaxin, to regulate the magnocellular neurons. Inputs from the brainstem (the nucleus of the solitary tract) and the ventrolateral medulla carry information from the heart and stomach. Inputs from the hippocampus to the CRH neurones are important regulators of stress responses. Inputs from neuropeptide Y-containing neurons in the arcuate nucleus coordinate metabolic regulation (via TRH secretion) with regulation of energy intake. Specifically, the projections from the arcuate nucleus seem to exert their effect on appetite via MC4R-expressing oxytocinergic cells of the PVN. Inputs from suprachiasmatic nucleus about levels of lighting (circadian rhythms). Inputs from glucose sensors within the brain stimulate release of vasopressin and corticotropin-releasing hormone from parvocellular neurosecretory cells.
== Clinical significance == Tumorigenesis in mammary glands can be induced biochemically by abnormal expression level of circulating hormones or local ECM components, or from a mechanical change in the tension of mammary stroma. Under either of the two circumstances, mammary epithelial cells would grow out of control and eventually result in cancer. Almost all instances of breast cancer originate in the lobules or ducts of the mammary glands.
Sources: en.wikipedia.org
Reports describe modulation of GABA signalling, changes in monoamine turnover and effects on neurotrophic factor expression. These observations come mainly from animal and cell studies. A single unifying mechanism has not been demonstrated.
The peptide enters plasma rapidly and is broken down by ordinary proteases into amino acids and shorter fragments. Reported half-lives are short. Whether meaningful amounts of the intact molecule reach the brain is an open question.
Most clinical reports are small, published in Russian and not independently replicated. English-language reviews highlight the absence of large randomised trials. Conclusions about efficacy should be treated as provisional.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, designed as a metabolically stabilized analogue of the endogenous tetrapeptide tuftsin. It has been studied mainly against anxiety-related and cognitive endpoints rather than as an approved medicine in most jurisdictions.