A practical reference on Tuftsin analog: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-03-17 and is reviewed periodically as new material appears.
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 not a naturally occurring peptide and has no known endogenous counterpart in human physiology. Russian-language sources frequently call it TP-7, while English-language sources use the name Selank almost exclusively. Database indexing is uneven, partly because early reports appeared in regional journals that are not widely cataloged. Some summaries describe the material as a tuftsin analog and others as a synthetic heptapeptide; the labels overlap rather than conflict. Citing the primary sequence resolves ambiguity more reliably than the research or trade name alone.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, written TKPRPGP in one-letter notation. Its structure consists of the immunomodulatory tetrapeptide tuftsin, Thr-Lys-Pro-Arg, extended at the carboxyl terminus by a Pro-Gly-Pro segment. The molecular formula is commonly given as C33H57N11O9, corresponding to a monoisotopic mass near 751.4 Da and an average molecular mass near 751.9 Da. All seven residues are proteinogenic amino acids, and the molecule carries no modified side chains or non-natural linkages.
| 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 |
Peptide bonds in selank are susceptible to hydrolysis under strongly acidic or basic conditions, and the terminal proline residues are vulnerable to exopeptidase activity in biological samples. Lyophilized powder stored dry at -20 °C typically remains stable for extended periods, whereas aqueous solutions degrade faster and may lose measurable purity within days to weeks depending on pH, temperature, and microbial load. Repeated freeze-thaw cycles promote aggregation and adsorption to container surfaces. For analytical work, solutions are usually prepared fresh, kept cold, and used within a single working day.
Handling follows standard practice for research peptides. Material is weighed in a low-humidity environment because the powder absorbs atmospheric moisture. Purity is reported as the percentage area of the main peak in a chromatogram, with specifications commonly set at 95 percent or higher; values below that threshold indicate the presence of truncated or modified species. Residual trifluoroacetate from purification is often present and may affect mass balance. Certificates of analysis should state the analytical method, the column and gradient used, and the lot-specific retention time so that results can be compared across suppliers.
Published work on this peptide almost always uses intranasal delivery, with drops or a spray applied to the nasal mucosa. Some animal experiments have used subcutaneous or intraperitoneal injection, and a smaller number have compared routes directly. Oral administration is not a focus of the literature, because short peptides of this size are broken down by digestive enzymes and cross intestinal barriers poorly. How much of an intranasal dose reaches the bloodstream intact in humans remains an open question.
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.
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.
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.
The plant is stemless and usually produces several rosettes consisting of wiry, lax, grasslike, flattened leaves. Leaves, up to 1 meter long and 12mm wide (3+1⁄3 feet x ~1⁄2 inch), have margins bearing many small, close-together, skin-cutting teeth. Inflorescences are panicle type and up to 35cm long (~14 inches) atop scapes up to 70cm tall (~2+1⁄3 feet) Flowers are functionally male or female, the males with larger stamens, the females with better developed pistils, but both types have both stamens and pistils. Flowers have six yellow-green tepals up to 2.5mm long (~2+1⁄3 inch) Fruits are winged, slightly inflated capsules up to 10 mm tall and 11mm wide (~1⁄3 inch).
Melamine is used to manufacture melamine-formaldehyde resin, a type of plastic known for its flame-retardant properties and commonly employed in countertops, dry-erase boards, etc. It has also been employed as a non-protein nitrogen, appearing in soy meal, corn gluten meal and cottonseed meal used in cattle feed. Melamine is known to cause kidney failure and kidney stones in humans and animals when it reacts with cyanuric acid inside the body. The use of melamine in food production is not approved by the World Health Organization (WHO) or national authorities. Melamine is nitrogen-rich, so it is sometimes illegally added to food products to increase their apparent protein content. The Kjeldahl and Dumas methods used to test for protein levels fail to distinguish between nitrogen in melamine and naturally occurring nitrogen in amino acids, allowing the protein levels to be falsified. Introduced into milk, it can help conceal fraudulent dilution with water. Melamine adulteration of food products also made headlines when pet food was recalled in Europe and the U.S. in 2007.
In the heart it can cause myocardial infarction In the brain, it can cause a transient ischemic attack (TIA), and, in prolonged blood obstruction, stroke. Blockage of arteries that supply arms or legs may result in necrosis and gangrene Temporary or permanent decrease or loss of other organ functions In septic embolism, there can be infection of the affected tissue or even septic shock, potentially leading to gangrene and sepsis
=== Mycorrhizal associations === Boletus edulis is mycorrhizal—it is in a mutualistic relationship with the roots of plants (hosts), in which the fungus exchanges nitrogen and other nutrients extracted from the environment for fixed carbon from the host. Other benefits for the plant are evident: in the case of the Chinese chestnut, the formation of mycorrhizae with B. edulis increases the ability of plant seedlings to resist water stress, and increases leaf succulence, leaf area, and water-holding ability. The fungus forms a sheath of tissue around terminal, nutrient-absorbing root tips, often inducing a high degree of branching in the tips of the host, and penetrating into the root tissue, forming, to some mycologists, the defining feature of ectomycorrhizal relationships, a hartig net. The ectomycorrhizal fungi are then able to exchange nutrients with the plant, effectively expanding the root system of the host plant to the furthest reaches of the symbiont fungi. Compatible hosts may belong to multiple families of vascular plants that are widely distributed throughout the Northern Hemisphere; according to one 1995 estimate, there are at least 30 host plant species distributed over more than 15 genera. Examples of mycorrhizal associates include Chinese red pine, Mexican weeping pine, Scots pine, Norway spruce, Coast Douglas-fir, mountain pine, and Virginia pine. The fungus has also been shown to associate with gum rockrose, a pioneer early stage shrub that is adapted for growth in degraded areas, such as burned forests.
M-phase inducer phosphatase: CDC25A; CDC25B; CDC25C; Dual specificity protein phosphatase: DUSP; DUSP1; DUSP2; DUSP4; DUSP5; DUSP6; DUSP7; DUSP10; DUSP16, aka MKP7; Thiosulfate:glutathione sulfurtransferase: KAT, now known as "TSTD1"; Adenylyltransferase and sulfurtransferase: MOCS3; 3-mercaptopyruvate sulfurtransferase: MPST, also known as "TSTD2" Not an enzyme: TBCK; TSGA14; Ubiquitin carboxyl-terminal hydrolase: USP8; Unknown activity: TSTD3
Sources: en.wikipedia.org
==== Narcolepsy ==== Narcolepsy is a chronic sleep-wake disorder that is associated with excessive daytime sleepiness, cataplexy, and sleep paralysis. Patients with narcolepsy are diagnosed as either type 1 or type 2, with only the former presenting cataplexy symptoms. Type 1 narcolepsy results from the loss of approximately 70,000 orexin-releasing neurons in the lateral hypothalamus, leading to significantly reduced cerebrospinal orexin levels; this reduction is a diagnostic biomarker for type 1 narcolepsy. Lateral hypothalamic orexin neurons innervate every component of the ascending reticular activating system (ARAS), which includes noradrenergic, dopaminergic, histaminergic, and serotonergic nuclei that promote wakefulness. Amphetamine's therapeutic mode of action in narcolepsy primarily involves increasing monoamine neurotransmitter activity in the ARAS. This includes noradrenergic neurons in the locus coeruleus, dopaminergic neurons in the ventral tegmental area, histaminergic neurons in the tuberomammillary nucleus, and serotonergic neurons in the dorsal raphe nucleus. Dextroamphetamine, the more dopaminergic enantiomer of amphetamine, is particularly effective at promoting wakefulness because dopamine release has the greatest influence on cortical activation and cognitive arousal, relative to other monoamines. In contrast, levoamphetamine may have a greater effect on cataplexy, a symptom more sensitive to the effects of norepinephrine and serotonin.
== Notable environmental chemists == Joan Berkowitz Paul Crutzen (Nobel Prize in Chemistry, 1995) Philip Gschwend Alice Hamilton John M. Hayes Charles David Keeling Ralph Keeling Mario Molina (Nobel Prize in Chemistry, 1995) James J. Morgan Clair Patterson Roger Revelle Sherry Roland (Nobel Prize in Chemistry, 1995) Robert Angus Smith Susan Solomon Werner Stumm Ellen Swallow Richards Hans Suess John Tyndall
United Parcel Service, Inc. (UPS) is an American multinational shipping-and-receiving and supply chain management company founded in 1907. Originally known as the American Messenger Company specializing in telegraphs, UPS has expanded to become a Fortune 500 company and one of the world's largest shipping couriers. UPS today is primarily known for its ground shipping services as well as the UPS Store, a retail chain which assists UPS shipments and provides tools for small businesses. UPS offers air shipping on an overnight or two-day basis and delivers to post office boxes through UPS Mail Innovations and UPS Ground Saver. UPS is the largest courier company in the world by revenue, with annual revenues around US$85 billion in 2020, ahead of competitors DHL and FedEx. UPS's main international hub, UPS Worldport in Louisville, Kentucky, is the fifth busiest airport in the world by cargo traffic based on preliminary statistics from ACI, and the third busiest in the U.S. The company is one of the largest private employers in the United States. As of 2023, UPS is third in U.S. parcel volumes shipped since 2015, trailing the United States Postal Service and Amazon.
=== Marinating swordfish === A traditional method marinating swordfish is to soak the swordfish into sake kasu. Normally, marinating food ingredients in sake kasu can increase the amount of inosine-monophosphate thus increasing the umami flavor of the dish. Soaking swordfish in sake kasu will decrease the amount of inosine-monophosphate in the swordfish and increase the level of inosine and the amount of inosine-monophosphate in the sake kasu marinade.
Sources: en.wikipedia.org
In English, it can also be called sea mustard. In Chinese, it is called qúndài cài (裙带菜) or hǎidài yá (海帶芽). In French, it is called wakamé or fougère des mers ('sea fern'). In Korean, it is called miyeok (미역).
== Causes == The cause of prediabetes is multifactorial and is known to have contributions from lifestyle and genetic factors. Ultimately prediabetes occurs when control of insulin and blood glucose in the body becomes abnormal, also known as insulin resistance. Risk factors for developing prediabetes include being overweight or obese, physical inactivity, an unhealthy diet, a family history of diabetes, having a genetic predisposition to prediabetes or diabetes, older age, and women who have a history of gestational diabetes or of giving birth to high birth weight infants (greater than 9 pounds or 4.1 kg). The increasing rates of prediabetes and diabetes suggest that lifestyle and/or environmental factors contribute to prediabetes. It remains unclear which dietary components are causative and risk is likely influenced by genetic background. Increasing physical activity and following a healthy diet can reduce the risk of progressing to type 2 diabetes.
Proglucagon is a protein that is a precursor of glucagon and several other components. It is cleaved from preproglucagon. Proglucagon is generated in the alpha cells of the pancreas and in the intestinal L cells in the distal ileum and colon. Preproglucagon in humans is encoded by the GCG gene and is composed of 180 amino-acid residues.
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.
The sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro, written TKPRPGP in one-letter code. It combines the tetrapeptide tuftsin with a carboxyl-terminal Pro-Gly-Pro extension. This full sequence identifies the molecule more precisely than the research name.