Selank powder, molecular formula C33H57N11O9, CAS 129954-34-3. Usually white or off white crystalline powder, odorless or almost odorless, with a certain degree of stability, but may degrade under high temperature, high humidity, strong light and other conditions. Its solubility varies depending on the solvent, and it is generally soluble in polar solvents for example water and physiological saline. It was initially developed based on the study of Tuftsin, a peptide that promotes phagocytosis. Peptides that promote phagocytosis have the ability to enhance the phagocytic function of immune cells, but they have disadvantages such as poor stability and short half-life. Researchers synthesized the substance by modifying and modifying its structure. After extensive experimental reseach, it has been found that it not only retains some immune regulatory functios, but also has unique pharmacological activities for example anti anxiet and cognitive improvement. With the deepening of reseach, it has been made into powder form for the convenience of storage, transportation, and use.
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Additional information of chemical compound:
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Selank+. COA
Pharmacological action
Neurotransmitter regulatory mechanism:
Selank powder can regulate various neurotransmitter sytems in the central nervous sytem. It can increase the release and activity of gamma aminobutyric acid (GABA), an important inhibitory neurotransmitter in the central nervous sytem that can suppress neuronal overexcitation and alleviate anxiet symptoms. At the same time, it can also regulate the serotonin (5-HT) system, increasing the concentration of serotonin in synaptic cleft. Serotonin is closely related to emotion regulation, and its level imbalance can lead to emotional disorders such as anxiet and depression. In addition, it may also affect the metabolism and transmission of other neurotransmitters for example dopamine and norepinephrine, comprehensively regulating the excitability of the nervous sytem and exerting anti anxiet effets.
Neuroendocrine regulation:
Anxiety states are often accompanied by disturbances in the neuroendocrine sytem, for example excessive activation of the hypothalamic pituitary adrenal axis (HPA axis). It can regulate the function of the HPA axis and reduce the secretion of stress hormones such as cortisol.
The increase in cortisol levels can exacerbate anxiet, and selanc alleviates anxiet symptoms by suppressing the excessive response of the HPA axis and reducing the release of cortisol.
Evidence from animal experiments and clinical studies:
In animal experiments, after using selanc on anxiet model animals, they showed a reduction in anxiet like behavior in behavioral tests, for example an increase in the time to enter the open arm in the elevated cross maze experiment and a more relaxed activity in the open field experiment.
Clinical studies have also shown that selanc has significant therapeutic effets on patients with anxiet disorders. A clinical trial targeting patients with generalized anxiet disorder showed that after treatmnt with selanc, patients' Self Rating Anxiet Scale (SAS) scores significantly decreased and there were fewer adverse reaction.
The impact on learning and memory:
It can promote the growth, differentiation, and synaptic plasticity of neurons. It can increase the expression of brain-derived neurotrophic factor (BDNF), an important neurotrophic factor that plays a crucial role in the survival, growth, and differentiation of neurons. By increasing BDNF levels, connections and information transmission between neurons can be enhanced, thereby improving learning and memory abilities. In animal experiments, the use of processed rats significantly improved their learning and memory performance in maze experiments, enabling them to find food or escape the maze faster.
The impact on attention and executive function:
It can also improve attention and executive funtion. It can regulate the neural activity of the cerebral cortex, enhance the synchronization between neurons, and make individuals more focused on tasks.
At the same time, it can improve the funtion of the prefrontal cortex, which is an important brain area for executive funtion, responsible for advanced cognitive functios for example decision-making, planning, and impulse suppression. The study found that after use, participants' performance improved in attention and executive funtion tests.
Potential mechanisms and clinical application prospects:
The potential mechanism by which selanc improves cognitive funtion may also be related to regulating neuroinflammation and oxidative stress. Neuroinflammation and oxidative stress can lead to neuronal damage and cognitive decline, while inhibiting the release of inflammatory factors can reduce oxidative stress damage and protect neurons.
In terms of clinical application, it is expected to be used to treat cognitive dysfuntion diseases for example Alzheimer's disease and mild cognitive impairment, but more clinical trials are still needed to verify its efficacy and safety.
The impact on immune cells:
It can regulate the funtions of various immun cells. It can enhance the phagocytic ability of macrophages, which are the first line of defense in the immun sytem and can engulf and clear pathogens and foreign substances. It can also promote the proliferation and differentiation of lymphocytes, enhance the cellular and humoral immun functios of the body. For example, in vitro experiments can increase the proliferation activity of T lymphocytes and B lymphocytes, and promote the production of antibodies.
Regulation of cytokines:
Cytokines play an important role in immun regulation. It can regulate the secretion of cytokines, increase the secretion of anti-inflammatory cytokines (for example interleukin-10), and reduce the secretion of pro-inflammatory cytokines (for example tumor necrosis factor alpha, interleukin-6).
The balanced regulation of cytokine secretion helps alleviate inflammatory reaction and maintain the stability of the immun sytem.
Potential applications in immune related diseases
Due to its immunomodulatory properties, it has potential application value in the treatmnt of immun related diseases. For example, in autoimmun diseases, the immue sytem's attack on one's own tissues can be reduced by regulating the activity of immun cells and the secretion of cytokines; In infectious diseases, it can enhance the immun funtion of the body and improve the resistance to pathogens.
Applicable population and dosage:
Suitable for patients with various types of anxiet disorders, including generalized anxiet disorder, social anxiet disorder, panic disorder, etc. The dosage varies for patients of different age groups and severity of the condition. The dosage can be gradually adjusted based on the patient's response and tolerance, but generally does not exceed 3mg per day.
Administration method:
Selank powder usually needs to be dissolved before use. Powder can be dissolved in physiological saline or injectable water to form a solution of a certain concentration, and then administered to patients through subcutaneous injection, intramuscular injection, or nasal administration.
Nasal administration is a convenient method, as drugs can be quickly absorbed into the bloodstream through the nasal mucosa and exert pharmacological effets.
Therapeutic effect and safety
Clinical studies have shown that it has good therapeutic effets on patients with anxiet disorders. It can significantly alleviate patients' anxiet symptoms, improve sleep quality, and enhance their quality of life. At the same time, it has high safety and fewer adverse reaction. Common adverse reaction include pain and swelling at the injection site, which are generally mild and can be relieved on their own.
Application in Alzheimer's disease:
In the early stages of Alzheimer's disease, it can be used as an adjuvant therapy drug. It can improve patients' cognitive functios for example memory, attention, language ability, etc., and delay the progression of the disease. However, there is currently relatively little reseach on the treatmnt of Alzheimer's disease in the elderly, and more clinical trials are needed to verify its long-term efficacy and safety.
Application in mild cognitive impairment:
For patients with mild cognitive impairment, it can help improve cognitive funtion and prevent further deterioration of the condition. Some preliminary clinical studies have shown that after treatmnt, patients' cognitive scores improve and their daily living abilities improve.
Application in autoimmune diseases:
It can be used as an adjuvant therapy in autoimmun diseases for example rheumatoid arthritis and systemic lupus erythematosus. It can regulate the funtion of the immun sytem, alleviate inflammatory reaction, and alleviate symptoms. However, the application of product in the treatmnt of autoimmue diseases is still in the reseach stage, and further clinical trials are needed to determine its efficacy and optimal treatmnt plan.
Application in infectious diseases:
In infectious diseases, it can enhance the immun funtion of the body and improve the resistance to pathogens. For example, in the treatmnt of some viral infectious diseases, antiviral drugs can be assisted to improve the therapeutic effet.
Comparison between selanc and other similar products
Structural and functional characteristics
Other peptide drugs, for example pro phagocytic peptides and thymopentins, also have certain immunomodulatory and biological activities. But selank powder has unique anti anxiet and cognitive improvement effets that other peptide drugs do not possess. Meanwhile, selanc has relatively high stability and bioavailability, which is more conducive to clinical application.
Clinical application scope
The clinical application scope of other peptide drugs is relatively narrow, mainly concentrated in the field of immue regulation. Selanc can not only be used for the treatmnt of immue related diseases, but also for the treatmnt of various diseases for example anxiet disorders and cognitive dysfuntion, with a wider range of clinical applications.
Preparation and Quality Control
Preparation method
Chemical synthesis method
At present, selanc is mainly prepared by chemical synthesis method. Chemical synthesis methods include two main methods: solid-phase synthesis and liquid-phase synthesis. Solid phase synthesis is the process of connecting amino acids one by one onto a solid support, followed by a series of chemical reaction and washing steps to ultimately cleave the target peptide from the support. Liquid phase synthesis involves the linkage reaction of amino acids in solution, and the synthesis of the target peptide is achieved by controlling the reaction conditions and the use of protective groups. The chemical synthesis method has the advantages of controllable reaction conditions and high product purity, but the synthesis process is relatively complex and the cost is high.
Biosynthesis
Biological synthesis is the use of microbial or cell culture sytems to produce selanc. For example, the gene encoding selanc can be introduced into bacterial or yeast cells through genetic engineering technology, allowing the cells to express and secrete selanc. The biosynthetic method has the advantages of low cost and environmental protection, but there are still problems for example low expression levels and difficult product purification, which require further reseach and optimization.
Quality control
Purity testing
Purity is one of the important indicators for measuring the quality of selanc Common purity testing methods include high-performance liquid chromatography (HPLC), mass spectrometry, etc. HPLC can separate and detect the content of each component in a sample based on the difference in distribution coefficients between the stationary and mobile phases. Mass spectrometry can determine the molecular weight and structural information of substances, further verifying the purity and structure of selanc.
Content determination
Content determination refers to determining the actual content of selanc in selanc. Quantitative analysis methods for example HPLC combined with external or internal standard methods are usually used for determination. By comparing with standard samples, calculate the content of selanc in the sample to ensure that it meets the specified quality standards.
Impurity analysis
Impurity analysis is an important part of quality control. Possible impurities in Selank powder include unreacted amino acids, by-products, degradation products, etc. Qualitative and quantitative analysis of impurities is carried out through methods for example HPLC and mass spectrometry to control the content of impurities within a safe range, ensuring the quality and safety of selanc.
The non classical binding mode between Selank and GABA receptors
Selank Powder is a synthetic heptapeptide drug with the sequence Thr Lys Pro Arg Pro Gly Pro (TKPRPGP), which enhances stability by mimicking the endogenous tetrapeptide Tuftsin (Thr Lys Pro Arg) and adding a proline glycine proline (PGP) tripeptide fragment. As an anti anxiety medication, Selank's uniqueness lies in its mechanism of action, which not only involves the traditional neurotransmitter system (such as serotonin and dopamine), but also interacts with gamma aminobutyric acid (GABA) receptors through non classical means. GABA is the main inhibitory neurotransmitter in the central nervous system, and its receptors (GABA_A and GABA_B) are the main targets of classic anti anxiety drugs such as benzodiazepines and barbiturates. However, the binding mode of Selank to GABA receptors is significantly different from traditional ligands, manifested as low affinity, non competitive regulation, and multi-target synergistic effects.
The structural basis and classical binding mode of GABA receptors
Structure and Function of GABA_A Receptor
GABA_A receptors belong to the ligand gated ion channel superfamily, consisting of five subunits (α 1-6, β 1-3, γ 1-3, δ, ε, θ, π) forming a pentamer structure. Classic binding sites include:
Positive allosteric regulatory site (BZD site): located at the alpha/gamma subunit interface, it is a binding site for benzodiazepines (such as diazepam), which produces sedative and anti anxiety effects by enhancing GABA induced chloride ion influx.
GABA binding site: located in the extracellular domain of the beta subunit, it is an endogenous GABA binding site that directly activates receptor channels.
Ethanol/steroid binding site: located at the alpha/beta subunit interface, mediating the regulatory effects of ethanol and neuroactive steroids.
Structure and Function of GABA_B Receptors
GABA_B receptor is a G protein coupled receptor (GPCR) composed of a heterodimer of GABA_B1 (binding subunit) and GABA_B2 (effector subunit). Classic binding sites include:
GABA binding site: located in the Venus flytrap domain of GABA_B1, it directly binds to GABA and induces receptor conformational changes.
Positive allosteric regulatory site: located in the transmembrane domain of GABA_B2, it is a binding site for compounds such as CGP7930, which can enhance the signal transduction of GABA_B receptors.
Binding characteristics of classical ligands
Traditional GABA receptor modulators (such as benzodiazepines, barbiturates, and baclofen) directly or indirectly regulate receptor activity by binding to specific sites with high affinity and competitiveness. For example, diazepam enhances GABA_A receptor function by binding to the BZD site, while baclofen inhibits adenylate cyclase (AC) activity by activating GABA_B receptors.
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The non classical binding mode between Selank and GABA receptors
Low affinity and multi-target binding: Molecular docking and surface plasmon resonance (SPR) studies have shown that Selank has significantly lower affinity for GABA_A and GABA_B receptors compared to classical ligands such as diazepam or GABA itself. Its dissociation constant (Kd) is typically in the micromolar (μ M) range, while traditional ligands have a nanomolar (nM) range. This low affinity binding suggests that Selank may exert its effect through the following ways:
Multi target synergy: Selank can simultaneously bind to the α/β subunit interface of GABA_A receptor and the GABA_B1/GABA_B2 heterodimer interface of GABA_B receptor, forming a "multi-point contact" regulatory network.
Dynamic binding: Low affinity binding allows Selank to rapidly bind and dissociate at physiological concentrations, achieving dynamic regulation of receptor function rather than sustained activation/inhibition.
Non competitive regulatory mechanism: Selank's regulation of GABA receptors exhibits non competitive characteristics, meaning its effect does not change with changes in GABA concentration. This pattern is in sharp contrast to classical competitive modulators such as the regulation of GABA_A receptors by clopidogrel.
Variable conformation regulation: Selank may bind to the conformational sites between the beta and gamma subunits of GABA_A receptors, or the transmembrane domain of GABA_B receptors (TM3-TM6), indirectly enhancing the affinity or signal transduction efficiency of GABA by inducing receptor conformational changes.
Receptor subunit selectivity: Selank exhibits higher selectivity towards the α 2/α 3 subunits of the GABA_A receptor (associated with anti anxiety effects), rather than the classical BZD site (shared by α 1/α 2/α 3/α 5 subunits), which may explain its lack of sedative side effects in anti anxiety effects.
Dynamic adaptability of peptide conformation: As a flexible heptapeptide, Selank exhibits highly dynamic conformation in solution, providing a structural basis for its non classical binding with GABA receptors.The rigidity of proline residues: Selank contains three proline (Pro) residues (Pro4, Pro6, Pro7), forming a local rigid structure that may serve as an "anchor" to interact with the flexible region of the receptor.Flexible connection of glycine: Gly5 serves as a flexible connection point, allowing Selank to adjust its conformation to adapt to the receptor surface topology during binding.
Molecular dynamics simulation:The simulated binding between Selank and GABA_A receptor α 2 subunit showed that its N-terminus (Thr1-Lys2) formed hydrogen bonds with the extracellular loop (ECL1) of the receptor, while its C-terminus (PGP fragment) formed hydrophobic interactions with the TM2-TM3 helix.This' bipolar binding 'mode allows Selank to slide on the receptor surface and dynamically adjust the binding site to optimize the regulatory effect.
Synergistic effect with endogenous regulatory molecules: Selank may form functional complexes with GABA receptors by simulating the regulatory patterns of endogenous neuropeptides such as neuropeptide Y and thyrotropin releasing hormone.
Co immunoprecipitation experiment: Selank treatment can enhance the co localization of GABA_A receptor and neuropeptide Y receptor Y1 subtype, suggesting that the two may synergistically regulate neuronal excitability by forming heterologous complexes.
Signal Transduction Cross Dialogue: After Selank activates GABA_B receptors, it can enhance the release of brain-derived neurotrophic factor (BDNF), which itself can regulate GABAergic neuron development through TrkB receptors, forming a positive feedback loop.
Frequently Asked Questions
What does it feel like to be on Selank?
Selank typically makes you feel calmer, less anxious, and more focused, acting like a tranquilizer but without drowsiness, by reducing stress, fear, and aggression while enhancing cognitive functions like memory and attention. Users often report a sense of tranquility, improved mood (antidepressant effects), better stress resilience, and clearer thinking, as it works by modulating neurotransmitters like GABA, dopamine, and serotonin, and boosting brain-derived neurotrophic factor (BDNF).
Does Selank make you sleepy?
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No - it calms the mind without making you sleepy, so it's perfect for daytime use. Is Selank safe for daily use? Yes. It's well-tolerated and suitable for long-term use under professional guidance.
Does Selank get you high?
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The result? A smoother mood, sharper cognition, and enhanced mental performance. Selank is non-sedating, non-addictive, and well-tolerated by most individuals, making it an appealing alternative to pharmaceutical anxiety treatments.
Why does hydroxyzine make me feel so good?
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It's similar to how you feel after taking Benadryl or NyQuil. But how it works for anxiety has to do with hydroxyzine's effects on serotonin - a chemical that plays a role in mood. Unlike other antihistamines, hydroxyzine may help boost serotonin levels in the brain to treat anxiety.
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