A Selank vial contains a lyophilized, synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) derived from the naturally occurring immunomodulatory peptide tuftsin, manufactured for laboratory research use only. Preclinical literature evaluates the Selank vial across neurochemical models to investigate its allosteric modulation of GABAergic signaling, upregulation of brain-derived neurotrophic factor (BDNF), and regulation of inflammatory cytokine expression.
A Selank vial contains a lyophilized, synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) derived from the naturally occurring immunomodulatory peptide tuftsin, manufactured for laboratory research use only. Preclinical literature evaluates the Selank vial across neurochemical models to investigate its allosteric modulation of GABAergic signaling, upregulation of brain-derived neurotrophic factor (BDNF), and regulation of inflammatory cytokine expression.
Selank is a synthetic analogue of the human immunoglobulin G (IgG) fragment known as tuftsin. Chemically designated as Thr-Lys-Pro-Arg-Pro-Gly-Pro, this heptapeptide incorporates an extended C-terminal sequence (Pro-Gly-Pro) designed to enhance metabolic stability against peripheral peptidases. In its standard lab-grade presentation, a Selank vial contains a highly purified, white to off-white lyophilized cake or powder preserved under an inert gas environment to prevent premature hydrolytic cleavage.
The molecular weight of free-base Selank is approximately 751.9 g/mol. To preserve structural integrity during long-term storage, the peptide is synthesized via solid-phase peptide synthesis (SPPS) and lyophilized into sealed borosilicate glass vials. Researchers utilizing compounds from our all-peptides research catalog rely on this precise lyophilization process to maintain physical stability prior to reconstitution in aqueous laboratory buffers.
In vitro and animal models have identified several central pathways through which Selank exerts regulatory influence. Primary among these is the modulation of the gamma-aminobutyric acid (GABA) system. Preclinical binding assays suggest that Selank acts as an allosteric modulator of GABA_A receptors, altering receptor affinity for native ligands without binding directly to the primary GABA recognition site. This mechanism distinguishes it from classical benzodiazepines and barbiturates.
Additionally, preclinical studies suggest that Selank administration influences monoamine metabolism in rodent brain tissue. Investigators evaluating broad central nervous system dynamics across our research library hub note that Selank alters serotonin (5-HT) metabolite concentrations, specifically 5-hydroxyindoleacetic acid (5-HIAA), within the hippocampus and hypothalamus. Simultaneously, in vitro gene expression profiling reveals that Selank exposure upregulates transcript levels for Brain-Derived Neurotrophic Factor (BDNF) and its primary receptor, TrkB, pointing toward potential neuroprotective and neuroplastic research applications.
To properly contextualize the pharmacological profile of Selank, laboratory investigators frequently run comparative assays alongside structural or functional analogues. The primary comparisons within regulatory neuropeptide research involve Semax, N-Acetyl Selank, and foundational tissue repair fragments like BPC-157.
While Selank is structurally derived from tuftsin and predominantly studied for its GABAergic, serotonergic, and immunomodulatory properties, Semax is an ACTH(4-10) derivative focused primarily on melanocortin receptor activation and cholinergic system enhancement. N-Acetyl Selank represents an N-terminally acetylated variant engineered to alter lipophilicity and enzymolysis rates in cellular membranes. Contrastingly, compounds like BPC-157 operate through vascular endothelial growth factor (VEGF) signaling pathways, targeting peripheral tissue regeneration rather than central neurotransmitter receptor expression. Evaluating these distinct mechanism pathways allows research institutions to select the appropriate candidate molecule for specific in vitro or preclinical animal assays.
Because Selank incorporates the sequence of tuftsin (Thr-Lys-Pro-Arg), it retains substantial functional relevance in neuroimmunology. Tuftsin is an endogenous tetrapeptide produced by enzymatic cleavage of the heavy chain of IgG, known for enhancing phagocytic activity, neutrophil chemotaxis, and macrophage activation.
In vitro studies demonstrate that Selank modulates the expression of both pro-inflammatory and anti-inflammatory cytokines. In murine splenocyte cultures, exposure to Selank alters the mRNA transcription rates of Interleukin-6 (IL-6), Interleukin-10 (IL-10), and Tumor Necrosis Factor-alpha (TNF-alpha). Researchers investigating the cross-talk between the nervous and immune systems utilize the tuftsin analogues overview documentation to design assays evaluating how peptide-based signals alter microglial activation states under neuroinflammatory stress conditions.
Assay reproducibility in quantitative biochemistry depends strictly on compound purity, identity verification, and freedom from bacterial contamination. PX1 Research enforces strict analytical standards across all production batches. Every research lot originating from our USA-based manufacturing facilities undergoes comprehensive analytical testing before release.
Purity is quantitatively confirmed using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC), ensuring a baseline purity standard of ≥99%. Identity verification is performed via Electrospray Ionization Mass Spectrometry (ESI-MS) to confirm exact molecular weight match. Furthermore, because bacterial endotoxins interfere with sensitive cell culture and animal models, every batch is verified for endotoxin compliance (LAL assay, <0.05 EU/mg) in an ISO 17025 accredited laboratory. Institutional procurement teams can establish institutional supply lines via our wholesale lab account portal to access lot-specific Certificates of Analysis (COAs) and bulk supply matrices.
Proper handling of a Selank vial is essential to maintain enzymatic stability and prevent aggregation. Lyophilized peptides are inherently hygroscopic and must be allowed to equilibrate to room temperature inside a desiccated environment prior to opening or stopper puncture.
Reconstitution should be performed using sterile, laboratory-grade solvents such as Bacteriostatic Water (0.9% benzyl alcohol) or Sterile Normal Saline (0.9% NaCl), depending on the experimental protocol. When adding the diluent down the glass wall of the vial, mechanical agitation or violent shaking must be avoided to prevent shear stress from denaturing the peptide chain. Gentle swirling or passive dissolution yields a clear, colorless aqueous solution. Reconstituted aliquots must be handled under laminar flow hoods to maintain sterility during laboratory dosing procedures.
Unreconstituted, lyophilized Selank vials exhibit high thermal stability when preserved under recommended climate controls. For long-term preservation (exceeding 30 days), vials should be stored in deep-freeze conditions at -20°C to -80°C, shielded from ambient light exposure. Under these conditions, structural degradation remains minimal over extended research timelines.
Once reconstituted into an aqueous solution, the peptide bond structure becomes significantly more susceptible to hydrolysis and oxidation. Reconstituted Selank solutions must be stored refrigerated at 2°C to 8°C and utilized within a designated experimental window (typically 14 to 28 days depending on the preservative used). Repeated freeze-thaw cycles of liquid solutions must be avoided, as phase transitions induce peptide shearing; researchers should aliquot reconstituted volumes into single-use microcentrifuge tubes prior to freezing.
In neurobehavioral research, rodent models (such as Wistar rats and C57BL/6 mice) are utilized to evaluate the effects of Selank across standardized behavioral assays. Models including the Elevated Plus Maze (EPM), Open Field Test, and Passive Avoidance Task allow investigators to quantify changes in exploratory activity, locomotory parameters, and memory retention following peptide administration.
Electrophysiological studies on hippocampal brain slices further clarify the micro-level actions of Selank. By recording field excitatory postsynaptic potentials (fEPSPs), researchers analyze alterations in synaptic plasticity and long-term potentiation (LTP). These preclinical frameworks aim strictly to elucidate foundational neurobiology, receptor kinetics, and gene expression profiles.
What is the primary sequence of the compound in a Selank vial?
The peptide in a Selank vial is a synthetic heptapeptide with the amino acid sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It consists of the tetrapeptide sequence of tuftsin combined with a stabilizing Pro-Gly-Pro C-terminal tripeptide.
How should an unopened Selank vial be stored upon delivery?
Unopened, lyophilized Selank vials should be stored at -20°C or colder in a dry, dark environment. PX1 Research ships compounds with same-day dispatch from CA and AZ facilities under ambient or cold-pack conditions optimized for stability.
What purity level is guaranteed for PX1 Research Selank vials?
Every lot of Selank provided by PX1 Research is verified via RP-HPLC to meet or exceed 99% chemical purity, backed by lot-specific Mass Spectrometry (MS) and endotoxin testing (<0.05 EU/mg).
What diluent is recommended for reconstituting a Selank vial?
For routine laboratory assays requiring multi-use sampling over several days, sterile Bacteriostatic Water (0.9% benzyl alcohol) is standard. For immediate cell culture or in vitro assays sensitive to preservatives, sterile 0.9% Normal Saline or phosphate-buffered saline (PBS) is recommended.
Is Selank approved for human consumption or therapeutic use?
No. All Selank vials supplied by PX1 Research are strictly intended for laboratory research use only (RUO), including in vitro cellular assays and preclinical animal models. They are not for human or animal therapeutic, diagnostic, or clinical applications.
How does Selank differ structurally from Semax?
Selank is derived from the human immunomodulatory fragment tuftsin (Thr-Lys-Pro-Arg-Pro-Gly-Pro), whereas Semax is derived from an adrenocorticotropic hormone fragment (ACTH 4-10, Met-Glu-His-Phe-Pro-Gly-Pro). They target different primary neurochemical cascades in preclinical models.
How can researchers obtain the Certificate of Analysis (COA) for a Selank vial batch?
Certificates of Analysis featuring RP-HPLC chromatograms, mass spectra, and endotoxin assay results are accessible directly on the product page or upon request by referencing the lot number printed on the physical vial label.
Can reconstituted Selank solutions undergo multiple freeze-thaw cycles?
No. Repeated freeze-thaw cycles induce mechanical stress that degrades peptide bonds and leads to loss of sample potency. Reconstituted liquids should be stored at 2–8°C for immediate use or sub-aliquoted into single-use containers before freezing.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.