Tuftsin analogue comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-02-05. Numbers and descriptions here follow the published literature rather than marketing material.
Proposed mechanisms center on modulation of the GABA system, but no single molecular target has been confirmed. Rodent studies report changes in GABA-A receptor expression and in the turnover of serotonin, dopamine, and norepinephrine in several brain regions. Increases in brain-derived neurotrophic factor and its receptor have also been described after repeated administration. These findings come largely from animal models, and the degree to which they describe human neurochemistry remains an open question. The mechanism is best characterized as multi-system and not fully resolved.
Pharmacokinetic data are limited. Like most short peptides, Selank is vulnerable to plasma and tissue peptidases, and its measured half-life in circulation is short, on a minutes scale. The Pro-Gly-Pro tail slows this degradation but does not eliminate it. Intranasal administration is the route described in most reports, with absorption through the nasal mucosa and a hypothesized path into the central nervous system that avoids the blood-brain barrier. Direct measurements of human brain exposure are unavailable, so distribution claims rest on inference from animal work.
Clinical evidence comes mainly from small studies conducted in Russia, several of which were open-label or lacked robust blinding. Reported outcomes include lower anxiety scores, changes in attention measures, and effects on asthenic states following illness. Sample sizes are typically in the tens of participants, and independent replication outside the region is scarce. Reviews published in English generally note the limited methodological quality of the underlying trials. Whether the compound produces clinically meaningful effects under rigorous conditions remains unresolved.
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 |
|---|---|---|
| Route studied | Intranasal | Predominant route in published reports |
| Circulation stability | Short, minutes scale | Peptidases cleave it; the tail slows the process |
| Analytical method | RP-HPLC with mass spectrometry | Used for identity and purity assessment |
| Reported outcome domains | Anxiety and cognitive measures | Derived from small, mostly regional trials |
| Regulatory status | Marketed in Russia | Availability outside that market is limited |
Identity and purity of selank are established with reversed-phase high-performance liquid chromatography coupled to mass spectrometry. The peptide elutes from C18 columns with acetonitrile gradients in water containing trifluoroacetic acid or formic acid, and detection is usually performed by ultraviolet absorbance near 214 nm. Electrospray ionization in positive mode gives a doubly protonated ion near m/z 377, consistent with a mass of about 752 Da. Amino acid analysis or tandem mass spectrometry of fragment ions confirms the sequence. Because the molecule has no aromatic residues, it lacks a usable 280 nm chromophore, so low-wavelength detection or mass spectrometry is required.
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.
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.
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.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, frequently abbreviated as TKPRPGP. It was designed as a structural analogue of tuftsin, a naturally occurring tetrapeptide released by enzymatic cleavage of the immunoglobulin heavy chain. The two additional proline residues at the C-terminal end extend the parent chain and change how the molecule behaves in solution. The free peptide has a calculated molecular mass of approximately 751.9 g/mol and is generally supplied as a lyophilised white to off-white powder.
Development work on the compound began in the 1980s and 1990s at the Institute of Molecular Genetics in Moscow, within the same research programme that produced the peptide Semax. Early investigators sought a tuftsin derivative with improved resistance to enzymatic breakdown and with activity in the central nervous system after peripheral administration. Most of the primary literature from this period was published in Russian, a factor that still shapes how easily the findings can be checked by outside groups.
Naming for this compound is not fully standardised in English sources. The spelling Selanc appears in some transliterations, and catalogue entries may instead list the peptide sequence itself as the identifier. Reference material sometimes groups it with other short synthetic peptides studied for behavioural effects, which can create confusion when citations are compared. Distinguishing the exact sequence from related tuftsin analogues is therefore a practical first step when reviewing any dataset or specification sheet.
=== Depression === Characterized by loss of neuroplasticity, depression is a common mood disorder causing persistent negative emotions and changes in lifestyle. Intranasal delivery of relaxin-3 mimetics demonstrated significant anti-depressant activity in behavior paradigms of rat models. Delivering a thermoresponsive hydrogel loaded with berberine intranasally exhibited high bioavailability in hippocampus and anti-depressant activity.
== See also == Capnocytophaga canimorsus Gangrene Mucormycosis, a rare fungal infection that can resemble necrotizing fasciitis (See type IV NF listing above) Noma (disease) Toxic shock syndrome Vibrio vulnificus
Design qualification (DQ)- Demonstrates that the proposed design (or the existing design for an off-the-shelf item) will satisfy all the requirements that are defined and detailed in the User Requirements Specification (URS). Satisfactory execution of the DQ is a mandatory requirement before construction (or procurement) of the new design can be authorised. Installation qualification (IQ) – Demonstrates that the process or equipment meets all specifications, is installed correctly, and all required components and documentation needed for continued operation are installed and in place. Operational qualification (OQ) – Demonstrates that all facets of the process or equipment are operating correctly. Performance qualification (PQ) – Demonstrates that the process or equipment performs as intended in a consistent manner over time. Component qualification (CQ) – is a relatively new term developed in 2005. This term refers to the manufacturing of auxiliary components to ensure that they are manufactured to the correct design criteria. This could include packaging components such as folding cartons, shipping cases, labels or even phase change material. All of these components must have some type of random inspection to ensure that the third party manufacturer's process is consistently producing components that are used in the world of GMP at drug or biologic manufacturer. There are instances when it is more expedient and efficient to transfer some tests or inspections from the IQ to the OQ, or from the OQ to the PQ.
Morgan Freeman (born June 1, 1937) is an American actor, producer, and narrator. In a career spanning six decades, he has received numerous accolades, including an Academy Award and a Golden Globe Award, as well as a nomination for a Grammy Award and a Tony Award. He was honored with the Kennedy Center Honor in 2008, an AFI Life Achievement Award in 2011, the Cecil B. DeMille Award in 2012, and Screen Actors Guild Life Achievement Award in 2018. In a 2022 readers' poll by Empire, he was voted one of the 50 greatest actors of all time. Born in Memphis, Tennessee, Freeman was raised in Mississippi, where he began acting in school plays. He studied theater arts in Los Angeles and appeared in stage productions in his early career. He rose to fame in the 1970s for his role in the children's television series The Electric Company. Freeman then appeared in the Shakespearean plays Coriolanus and Julius Caesar, the former of which earned him an Obie Award. In 1978, he was nominated for the Tony Award for Best Featured Actor in a Play for his role as Zeke in the Richard Wesley play The Mighty Gents. Freeman received the Academy Award for Best Supporting Actor playing a former boxer in Clint Eastwood's sports drama Million Dollar Baby (2004). He was Oscar-nominated for Street Smart (1987), Driving Miss Daisy (1989), The Shawshank Redemption (1994), and Invictus (2009). He also performed in Glory (1989), Lean on Me (1989), Robin Hood: Prince of Thieves (1991), Unforgiven (1992), Se7en (1995), Amistad (1997), Deep Impact (1998), Gone Baby Gone (2007), and The Bucket List (2007).
Sources: en.wikipedia.org
=== Biomonitoring === Parmotrema perlatum is sensitive to air pollution, making it a useful bioindicator. This sensitivity is utilised in the "Hawksworth and Rose" scale, which estimates mean winter sulphur dioxide (SO2) levels in England and Wales by observing lichens on acidic and nutrient-poor bark. According to this scale, P. perlatum is found only in zones 8 to 10, indicating areas with the lowest SO2 concentrations, less than 35 micrograms per cubic metre (μg/m3). A 2022 study analyzed the effects of SO2 and nitrogen dioxide (NO2) fumigation on the chlorophyll content of Parmotrema perlatum collected from the Mount Lawu volcano in Indonesia. The results indicated that increased exposure to these pollutants leads to a significant reduction in chlorophyll levels. The study demonstrated that SO2 and NO2 negatively impact the physiological processes of the lichen, particularly its photosynthetic efficiency, demonstrating the sensitivity of P. perlatum to air pollution. Parmotrema perlatum has been effectively used in biomonitoring studies to assess environmental radioactivity. Research conducted in Turkey found that this lichen species retains radioactive caesium-137 (137Cs) from atmospheric deposition, such as fallout from the Chernobyl accident. The ecological half-life of 137Cs in Parmotrema perlatum was determined to be approximately 5.5 years, indicating its capability to monitor long-term radioactive contamination in the environment.
=== Road freight === Transport by road is by far the most popular means of moving freight around South Africa. As of October 2025, over 85% of land freight in SA travels by road. For every ton of freight moved by rail, more than six tons is moved by road. Each year, almost 1 billion tons (984 million) of freight is transported along South Africa's road networks. This is an increase of over 50% over the period between 2010 and 2025. National roads in South Africa are administered by SANRAL, a state-owned company that reports to the Department of Transport. SANRAL is responsible for financing, managing, planning, developing, and maintaining the national road network. Municipalities also have control over and put funding into certain roadways. Certain avenues of private funding for roadways in South Africa also exist.
The prime recovery ship was USS Wasp. The recovery was supported by 10,249 U.S. Department of Defense personnel, 134 aircraft, and 26 ships. Postflight medical examination found the astronauts to be in good health, and no significant physiological changes were found.
Sources: en.wikipedia.org
Reports describe effects on GABA-A receptor expression, monoamine turnover, and neurotrophic factor levels. These are proposed mechanisms drawn mainly from animal models. No single molecular target has been established.
Intranasal delivery is the route described in most published work. It is used because the peptide is degraded quickly once it reaches circulation. Direct evidence of brain penetration in humans is lacking.
Most trials are small, regionally concentrated, and often lack rigorous blinding or placebo control. Independent replication is limited. Reviews in English generally rate the evidence as preliminary.
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.