This is a working overview of tuftsin, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-07-25. Anything still debated is marked as such rather than presented as settled.
Laboratory work relies on standard behavioral paradigms. Rodents are tested in the elevated plus maze, open field, and passive avoidance tasks, with outcomes compared against diazepam or vehicle controls. Intranasal dosing is used most often because it bypasses first-pass metabolism, though intraperitoneal and intravenous routes also appear in published protocols. Biochemical endpoints include tissue BDNF concentrations, cytokine levels, and monoamine metabolites. Human data are limited to small Russian trials reporting reduced anxiety scores; most were not prospectively registered, and few employed independent outcome assessment.
Measuring peptide exposure inside the brain is technically difficult. Selank is degraded rapidly in plasma, and assays must separate intact peptide from fragments, which favors targeted mass spectrometry over immunoassays alone. Reported half-lives are short, on the order of minutes, so effects observed hours later are attributed to downstream signaling rather than to the parent compound. Blood-brain barrier permeability is debated and rarely quantified directly. Gaps include absent dose-response characterization, inconsistent reporting of purity, and almost no pharmacokinetic data from human participants.
Selank is studied chiefly as an animal-model anxiolytic with proposed secondary effects on memory and immune signaling. Reported mechanisms include modulation of the GABA-A receptor complex, inhibition of enkephalin-degrading enzymes, and shifts in monoamine turnover within limbic structures. Some experiments describe increased expression of brain-derived neurotrophic factor in the hippocampus after repeated dosing. No single molecular target has been confirmed, and the peptide does not bind any receptor with the selectivity typical of a conventional small-molecule drug. Mechanism therefore remains a set of hypotheses rather than an established pathway.
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.
| Property | Value | Notes |
|---|---|---|
| Principal proposed target | GABA-A receptor complex | Hypothesis derived mainly from animal pharmacology |
| Common behavioral assay | Elevated plus maze | Rodent test for anxiety-like behavior |
| Reported molecular marker | Hippocampal BDNF expression | Measured by immunoassay or mRNA quantification |
| Typical dosing route | Intranasal | Chosen to reduce first-pass metabolism |
| Reported plasma half-life | Minutes | Based on limited peptide stability data |
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.
Reported activity for Selank centers on anxiolytic and nootropic effects. Russian clinical reports describe use in anxiety and in cognitive or attention-related complaints. Most of this evidence comes from studies conducted by the same research groups that developed the peptide. Independent replication in other countries remains limited, and no major Western regulatory agency has approved the compound for any indication. The gap between local reports and external verification is a recurring point in discussions of the peptide.
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.
Lyophilized material is generally stable for extended periods when kept dry at or below minus twenty degrees Celsius. Working solutions are less stable, and common practice is to aliquot and freeze them so that repeated freeze-thaw cycles are avoided. Aqueous solutions are sensitive to pH extremes and to microbial growth, so short-term storage at refrigerator temperature is typical. Oxidation and hydrolysis are the principal degradation routes. Reconstitution with sterile water or a mild buffer is standard, and solutions should be protected from light.
Regulatory treatment varies by jurisdiction. In Russia the compound is a registered prescription product, while in the European Union and the United States it is generally handled as a research chemical without a marketing authorization. Suppliers therefore operate outside pharmaceutical oversight, and buyers rely on supplier documentation for purity and identity claims. Chain of custody and third-party testing are the main verification tools. Analysts note that the absence of a pharmacopoeial monograph for research-grade material limits standardization across vendors.
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.
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.
The phenomenon of multiple nuclear copies of mitochondrial tRNA (tRNA-lookalikes) has been observed in many higher organisms from human to the opossum suggesting the possibility that the lookalikes are functional. In humans, cytoplasmic tRNA genes can be grouped into 49 families according to their anticodon features. These genes are found on all chromosomes, except the 22 and Y chromosome. High clustering on 6p is observed (140 tRNA genes), as well as on chromosome 1. The HGNC, in collaboration with the Genomic tRNA Database (GtRNAdb) and experts in the field, has approved unique names for human genes that encode tRNAs. Typically, tRNA genes from Bacteria are shorter (mean = 77.6 bp) than those from Archaea (mean = 83.1 bp) and eukaryotes (mean = 84.7 bp). The mature tRNA follows an opposite pattern, with tRNAs from Bacteria being usually longer (median = 77.6 nt) than tRNAs from Archaea (median = 76.8 nt), with eukaryotes exhibiting the shortest mature tRNAs (median = 74.5 nt).
=== Act 2 === Lucinda, a runaway slave, rifles through the pockets of the dead chain gang prisoners. Inman regains consciousness and awakens, which startles her. Lucinda frees Inman, who resumes his journey. Back at Black Cove Farm, Stobrod and his traveling companion Pangle still rely upon Ruby and Ada for sustenance. Stobrod tries to convince Ruby that he is a changed man, but Ruby remains skeptical. Inman meets Sara, a war widow, who is trying to comfort her baby. Inman helps her, gains her trust, and is invited to spend the night. At Black Cove Farm, Teague appears, with a copy of the newspaper that lists the names of deserters, on which Ruby sees her father's name. The next morning, Inman and Sara react quickly when Union soldiers appear. At a campfire in the woods, Teague and his men confront Stobrod and Pangle, shoot them and leave them for dead. Ada finds the two men, and expresses compassion for Stobrod ("I feel sorry for you"). Ada later goes hunting in the woods. There, she and Inman reunite. The other characters whom Inman has encountered on his odyssey appear to Inman, and urge him to tell Ada about his adventures ("Tell her of the slave you met"; "Tell her how the boat went down"). The couple affirms their pledge to each other. Teague continues his pursuit. Ada and Inman consummate their love, on their final night together. Eventually, Teague and the Home Guard track down Inman. In the final battle, Inman is killed.
Cut flowers have become a part of international trade and an active economic engine in a number of tropical countries (for instance in Kenya). Research and markets has estimated that the cut flower global market will reach a size of US$50.1 billion by 2030 from its current estimate of US$33.3 billion for 2022. Roses are projected to increase at a 5.9% compound annual growth rate, while chrysanthemum and gerbera will increase by 5.3% over the next eight years. Royal FloraHolland in Aalsmeer, Netherlands, is the largest flower market in the world. Flowers with a value of over US$4 billion pass through the market each year. In 2019, the export value of cut flowers was €4,200 million from the EU, Colombia exports were €1,235 million, Ecuador exports were €721 million, Kenya exports were €487 million and Ethiopia exports were €180 million, while US exports were only €14 million compared to €1,052 million in imports. Union Fleur, a European international flower trade association, represents the interests of Austria, Colombia, Denmark, Ethiopia, Germany, Italy, Kenya, Netherlands, Sweden, Turkey, Uganda, and the United States. Most of Royal FloraHolland exports go to European neighbors. Cut flower exports from China rose from US$71.4 million in 2011 to US$162.1 million in 2022, primarily from Yunnan Province where there are 300,000 farmers cultivating 1.5 million hectares of flowers. Overall production is much higher because 90% of flowers are sold in China. Most cut flowers are sold through the Dounan Flower Market in Kunming, Yunnan, China.
Sources: en.wikipedia.org
A cilium (fine hair) which projects above the surface and acts as a trigger. Spirocysts do not have cilia. A tough capsule, the cnida, which houses the thread, its payload and a mixture of chemicals that may include venom or adhesives or both. ("cnida" is derived from the Greek word κνίδη, which means "nettle") A tube-like extension of the wall of the cnida that points into the cnida, like the finger of a rubber glove pushed inwards. When a cnidocyte fires, the finger pops out. If the cell is a venomous nematocyte, the "finger"'s tip reveals a set of barbs that anchor it in the prey. The thread, which is an extension of the "finger" and coils round it until the cnidocyte fires. The thread is usually hollow and delivers chemicals from the cnida to the target. An operculum (lid) over the end of the cnida. The lid may be a single hinged flap or three flaps arranged like slices of pie. The cell body, which produces all the other parts. It is difficult to study the firing mechanisms of cnidocytes as these structures are small but very complex. At least four hypotheses have been proposed:
In the morning of 8 October, Hezbollah fired rockets and shells at the Shebaa Farms region in support of Hamas's attack onto Israel; in response, the Israel Defense Forces (IDF) fired artillery shells and a drone into southern Lebanon. Two Lebanese children were reportedly injured by broken glass. The next day, Israel exchanged a series of airstrikes on southern Lebanon near the towns of Marwahin, Ayta ash Shab and Dhayra in the Bint Jbeil district. This was after numerous Palestinian militants infiltrated the Israeli border, which Hezbollah denied involvement with. The Palestinian Islamic Jihad militia claimed responsibility for the armed infiltration. The IDF killed at least two perpetrators (likely Palestinians), while a third returned to Lebanon. A Hezbollah media source announced three of Hezbollah's members died in the IDF retaliation. Hezbollah fired rockets and artillery in retaliation. During the clashes, two Israeli soldiers and Lt. Col Alim Abdallah, Deputy Commander of the IDF's 300th Brigade, were killed and another three were wounded. On 11 October, Hezbollah fired anti-tank missiles at an IDF position and claimed to have produced casualties. In response, the IDF shelled the area where the attack was launched. The Lebanese-Italian hospital in Tyre admitted three injured civilians. The IDF ordered residents of northern Israel to seek shelter following reports of drones being launched from southern Lebanon. A Patriot missile was launched to intercept a suspicious projectile, after which the IDF found that the object in question was not a drone.
Although PI3K is the major mode of Akt activation, other tyrosine or serine/threonine kinases have been shown to activate Akt directly, in response to growth factors, inflammation or DNA damage. These can function even when PI3K activity is inhibited. Other studies have shown Akt can be activated in response to heat shock or increases in cellular Ca2+ concentration, via Ca2+/Calmodulin-dependent protein kinase kinase (CAMKK).
Sources: en.wikipedia.org
Promising innovations relating to global challenges are demonstrated: an overview of "the nascent industry of AI-designed drugs" (1 June), after moderators of the Web content aggregation-based platform Reddit strike against the site's introduction of API pricing and the ensuing closing of several mobile client apps, several novel decentralized open source aggregation platforms gain substantial numbers of users – most notably Lemmy and Kbin which can synchronize their posts via interoperability (12 June), the first upgrade of the Global Earthquake Model data for disaster risk reduction is reported (13 June), first approval for two cultured meat products in the U.S. and two of the first worldwide (21 June), transgenic soya beans containing pig protein (Piggy Sooy) are reported (28 June), a new type of glass (LionGlass) that is substantially more damage-resistant and more sustainable is reported (30 June).
=== Unnatural amino acid incorporation === Cell-free systems have also been used to incorporate unnatural amino acids. Shimizu et al. were able to change a stop codon to a sense codon by omitting the RF1 release factor, indicating ability to insert desired amino acids in unnatural situations. This is of use in systems where working inside a cell is problematic, such as the process of amino acid metabolism preventing specific labelling of amino acids that would be useful in multidimensional NMR spectroscopy. Kigawa et al.were able to successfully label amino acids in a cell-free system where amino acid metabolism was no longer present, thus making such systems useful to NMR studies.
=== French === During the war, there were many instances of war rapes against Vietnamese civilians by French soldiers. This occurred in Saigon, alongside robberies and killings, following the return of the French in August 1945. Vietnamese women were also raped by French soldiers in northern Vietnam in 1948, following the defeat of the Viet Minh, including in Bảo Hà, Bảo Yên District, Lào Cai province and Phu Lu. This led to 400 French-trained Vietnamese defecting to the Viet Minh in June 1948. French killings of Vietnamese civilians were reported, many of them were caused by the tendency of Viet Minh troops to hide among civilian settlements. One of the largest massacres by French troops was the Mỹ Trạch massacre of November 29, 1947, in which French soldiers killed over 200 women and children. Regarding this massacre and other atrocities during the conflict, Christopher Goscha wrote in The Penguin History of Modern Vietnam:Rape became a disturbing weapon used by the Expeditionary Corps, as did summary executions. Young Vietnamese women who could not escape approaching enemy patrols smeared themselves with any stinking thing they could find, including human excrement. Decapitated [sic] heads were raised on sticks, bodies were gruesomely disemboweled, and body parts were taken as 'souvenirs'; Vietnamese soldiers of all political color also committed such acts. The non-communist nationalist singer, Phạm Duy, wrote a bone-chilling ballad about the mothers of Gio Linh village in central Vietnam, each of whom had lost a son to a French Army massacre in 1948.
=== 1970s === 1975: Chien-Shiung Wu, born in China but having become an American citizen in 1954, became the first female president of the American Physical Society. 1976: Margaret Burbidge, born in England, was named as the first female president of the American Astronomical Society. 1977: Rosalyn Yalow received the Nobel Prize in Physiology or Medicine "for the development of radioimmunoassays of peptide hormones"; she shared it with Roger Guillemin and Andrew V. Schally "for their discoveries concerning the peptide hormone production of the brain." 1978: Anna Jane Harrison became the first female president of the American Chemical Society. 1978: Mildred Cohn served as the first female president of the American Society for Biochemistry and Molecular Biology, then called the American Society of Biological Chemists.
Sources: en.wikipedia.org
Intranasal administration predominates in both animal and human research because it avoids hepatic first-pass metabolism. Injectable and intraperitoneal routes appear in animal work mainly for comparison.
Behavioral endpoints include time spent in open arms of the elevated plus maze and avoidance latencies. Biochemical endpoints include BDNF concentration, cytokine levels, and monoamine metabolite ratios in brain tissue.
Most published studies are small, originate from a limited number of laboratories, and lack independent replication. Dose-response relationships, measured brain exposure, and long-term outcomes are not well characterized.
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.