A practical reference on tuftsin: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-10-28. Anything still debated is marked as such rather than presented as settled.
Lyophilized Selank, the dry powder form, is generally stored frozen at minus 20 degrees Celsius or colder for long-term keeping. The solid is hygroscopic and should stay sealed, dry, and protected from light. Once dissolved, the peptide is less stable and is usually held refrigerated at 2 to 8 degrees Celsius for short periods. Repeated freezing and thawing is avoided because it can promote aggregation and loss of activity. Buffers and pH choice also affect how long a solution remains usable.
Solubility behavior is a practical concern for handling. Selank dissolves readily in water and in common aqueous buffers, which simplifies preparation of working solutions. The choice of solvent, ionic strength, and pH can influence aggregation over time, particularly at higher concentrations. Aqueous solutions are typically sterile-filtered before use. Because stability depends on several variables, storage and handling notes should be treated as general guidance rather than fixed rules, and specific values are best confirmed against a certificate of analysis for each batch.
Characterization of Selank in a laboratory setting relies on standard peptide methods. Reverse-phase high-performance liquid chromatography separates the target from related impurities and provides a purity figure, commonly reported as 95 percent or higher. Mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, confirms the molecular mass and helps detect truncation or modification. Amino acid analysis can verify composition when a sequence-level check is needed. These techniques together establish identity and purity for a given lot.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Solubility | Freely soluble in water | Also in aqueous buffers |
| Typical purity (HPLC) | 95 percent or higher | Lot-dependent |
| Dry powder storage | Minus 20 degrees Celsius | Sealed, dry, protected from light |
| Solution storage | 2 to 8 degrees Celsius | Short-term use |
| Identity confirmation | Mass spectrometry | ESI or MALDI-TOF |
Lyophilised material kept dry at minus 20 degrees Celsius or colder is the most stable form, and suppliers commonly state a shelf life of two years or more under those conditions. Once dissolved, degradation accelerates through hydrolysis and deamidation, particularly at alkaline pH or elevated temperature. Working solutions are usually divided into single-use aliquots to avoid repeated freeze-thaw cycles. The choice of reconstitution solvent affects both stability and the ionic strength of the final preparation.
Reverse-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres is the standard purity method. Mass spectrometry, typically electrospray ionisation, confirms identity through the expected mass-to-charge pattern. Amino acid analysis can verify composition independently. Chiral purity requires separate techniques such as derivatisation followed by chromatographic separation, and such data are rarely reported for research-grade material.
Quantification in biological matrices relies on liquid chromatography coupled to tandem mass spectrometry with stable-isotope internal standards. Low plasma concentrations and adsorption to container surfaces both complicate measurement. Solid-phase extraction is often needed to reduce matrix interference before injection. Reported limits of quantification differ widely between laboratories, which makes direct comparison of pharmacokinetic results difficult and limits meta-analysis.
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.
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 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.
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.
Purity assessment relies mainly on reverse-phase high-performance liquid chromatography with ultraviolet detection. Because the peptide lacks a strong chromophore, detection often uses backbone absorbance near 214 nm. Identity is confirmed by mass spectrometry, typically electrospray ionization or matrix-assisted laser desorption, comparing the measured mass against the expected value. Amino acid analysis can verify composition after acid hydrolysis. Diastereomer content and residual counterions are reported less often, although both can influence biological assays.
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.
A story with Frazier Tharpe for GQ, published on June 2, 2025, started by stating that Clipse were unimpressed with the current state of mainstream hip-hop. The brothers gave Stove God Cooks and Future as exceptions. Pusha T lamented the feelings of loneliness and need to play "industry games" that came with his solo career, revealed that he was already becoming disillusioned with his former boss West during the 2019 recording sessions for Jesus Is King, and criticized West for his perceived character flaws. He also denied being a bad friend to West. The story of Clipse's dispute with Def Jam Recordings was told for the first time in this interview. Also included were comments about Drake suing Universal Music Group ("The suing thing is bigger than some rap shit. I just don't rate you.") and more details about the album: tracks "Mike Tyson", "POV", "F.I.C.O.", and features from Stove God Cooks and Lamar. After the release of "So Be It", GQ published a follow-up article (with unused excerpts from the interview) in which the song was discussed, including lyrics from Pusha T which diss Travis Scott. Another interview with Andre Gee for Rolling Stone was published on June 9. Clipse elaborated on their distribution deal with Roc Nation and announced a nationwide United States tour, planned to take place across twenty-five shows from August 3 to September 10.
== Applications == Alpha emitters such as actinium-225 are favored in cancer treatment because of the short range (a few cell diameters) of alpha particles in tissue and their high energy, rendering them highly effective in targeting and killing cancer cells—specifically, alpha particles are more effective at breaking DNA strands. The 10-day half-life of 225Ac is long enough to facilitate distribution, but short enough that little remains in the body months after treatment. Additionally, each decay of 225Ac to 209Bi nets four high-energy alpha particles, greatly increasing its potency. Despite its limited availability, several clinical trials have been completed, demonstrating the effectiveness of 225Ac in targeted alpha therapy. Complexes including 225Ac—such as antibodies labeled with 225Ac—have been tested to target various types of cancer, including leukemia, prostate carcinoma, and breast carcinoma in humans. For example, one experimental 225Ac-based drug has shown effectiveness against acute myeloid leukemia without harming the patient. Further clinical trials of other drugs are underway such as the SatisfACtion trial (NCT04597411), a Phase I/II, open-label, multi-center study that is evaluating 225Ac-PSMA-R2 in patients with metastatic hormone-sensitive prostate cancer (mHSPC) and metastatic castration-resistant prostate cancer (mCRPC).
Steroidal antiandrogens are antiandrogens that resemble steroid hormones like testosterone and progesterone in chemical structure. They are the most commonly used antiandrogens in transgender women. Spironolactone (Aldactone), which is relatively safe and inexpensive, is the most frequently used antiandrogen in the United States. Cyproterone acetate (Androcur), which is unavailable in the United States, is widely used in Europe, Canada, and the rest of the world. Medroxyprogesterone acetate (Provera, Depo-Provera), a similar medication, is sometimes used in place of cyproterone acetate in the United States.
Sources: en.wikipedia.org
In fact, the aggregation of a protein generates a variety of aggregates, all of which are likely to be toxic to some degree. A wide variety of biochemical, physiological and cytological perturbations has been identified following the exposure of cells and animals to such species, independently of their identity. The oligomers have also been reported to interact with a variety of molecular targets. Hence, it is unlikely that there is a unique mechanism of toxicity or a unique cascade of cellular events. The misfolded nature of protein aggregates causes a multitude of aberrant interactions with a multitude of cellular components, including membranes, protein receptors, soluble proteins, RNAs, small metabolites, etc.
Epithelia control the secretion of hormones into the circulatory system, as well as the secretion of sweat, mucus, enzymes, and other products that are delivered by ducts Epithelial membranes include the serous membrane (which lines body cavities), cutaneous membrane (i.e. the skin), and mucous membrane (which lines the interior of hollow organs). Other functions of epithelial cells include diffusion, filtration, secretion, selective absorption, and transcellular transport.
=== Cleaning of cork === Natural cork is a suberin based natural polymer foam that can have unpleasant substances which are responsible for the loss of quality in wine. The leading substance is 2,4,6 trichloroanisole (TCA), which can be detected at concentrations as low as 2 ng/l in the wine. Supercritical CO2 is used at industrial scale to remove this substance and guarantee that the wine retains its full quality.
In October 2014, Shankar announced the production of an unofficial spin-off online series based on the Dark Judges that would be released later that month. The animated miniseries was titled Judge Dredd: Superfiend and all its six episodes were released on 27 October 2014 on YouTube. In March 2015, Garland said that a direct sequel would likely not happen in the near future, at least not with the crew involved in the original film. In 2016, Urban said that "conversations are happening" regarding a Dredd continuation on streaming services Netflix or Amazon Prime. In an interview in May 2016, Urban said that while the film's "mishandled" marketing strategy and "unfortunate" box office performance meant that it was "problematic" to try to make a sequel, "the success it has achieved in all post-theatrical mediums has definitely strengthened the argument in favour of a sequel." In May 2017, a television series named Judge Dredd: Mega-City One was announced to be in development by IM Global Television and Rebellion. In August 2017, Urban stated he was in discussion to star in the series. The series was eventually put on hold due to the pandemic back in 2020. Rebellion CEO Jason Kingsley explained to Radio Times back in 2020, "I want there to be a sequel [to Dredd]. We've got the rights back so we can do it, we've just got to get rid of this virus thing that's going on at the moment, and then hopefully things can kick off in all sorts of different areas of making film and TV, it's just– it's all very messed up at the moment for everybody".
Sources: en.wikipedia.org
CPA is available in the form of oral tablets alone (higher-dose; 10 mg, 50 mg, 100 mg) or in combination with ethinylestradiol or estradiol valerate (low-dose; 1 or 2 mg CPA) and in the form of ampoules for intramuscular injection (higher-dose; 100 mg/mL, 300 mg/3 mL; brand name Androcur Depot). The higher-dose formulations are used to treat prostate cancer and certain other androgen-related indications while the low-dose formulations which also have an estrogen are used as combined birth control pills and are used in menopausal hormone therapy for the treatment of menopausal symptoms.
=== SARS-CoV-2 === Rapamycin has been proposed as a treatment for severe acute respiratory syndrome coronavirus 2 insofar as its immunosuppressive effects could prevent or reduce the cytokine storm seen in very serious cases of COVID-19. Moreover, inhibition of cell proliferation by rapamycin could reduce viral replication.
Sulfur dioxide is used as an antioxidant in some dried fruits to protect their color and flavor. For example, in golden raisins, dried peaches, apples, and apricots, sulfur dioxide is used to keep them from losing their light color by blocking browning reactions that darken fruit and alter their flavor. Over the years, sulfur dioxide and sulfites have been used by many populations for a variety of purposes. Sulfur dioxide was first employed as a food additive in 1664, and was later approved for such use in the United States as far back as the 1800s. Sulfur dioxide, while harmless to healthy individuals, can induce asthma when inhaled or ingested by sensitive people. The U.S. Food and Drug Administration (FDA) estimates that one out of every hundred people is sulfite-sensitive, and about 5% of asthmatics are also at risk of suffering an adverse reaction. Given that about 10% of the population has asthma, this figure translates to 0.5% of the whole population with potential for sulfite-sensitivity. These individuals make up the subgroup of greatest concern and are largely aware of the need to avoid sulfite-containing foods. Consequently, the FDA requires food manufacturers and processors to disclose the presence of sulfiting agents in concentrations of at least 10 parts per million. In Taipei, Taiwan, a 2010 city health survey found one-third of tested dried fruit products failed health standard tests, most having excessive amounts of sodium cyclamate, some at levels 20 times higher than the legal limit.
Sources: en.wikipedia.org
Reverse-phase HPLC is the usual method and gives a percentage purity value. Mass spectrometry then confirms the molecular mass. Together they provide a basic identity and purity profile for a lot.
Freeze-dried material is kept frozen, often at minus 20 degrees Celsius, and protected from light and moisture. Dissolved peptide is refrigerated for short-term use. Repeated freeze-thaw cycles are avoided.
A certificate of analysis typically lists purity by HPLC, the confirmed mass, appearance, and sometimes water or counter-ion content. It documents results for a specific batch. Details vary by supplier.
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.