Introduction
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro, developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. It is an analogue of the endogenous immunopeptide tuftsin (Thr-Lys-Pro-Arg), with a Pro-Gly-Pro C-terminal extension that confers resistance to enzymatic degradation and extends its biological half-life. Selank has been the subject of research primarily focused on anxiolytic activity, cognitive enhancement, and immunomodulation.
All Selank products supplied by Alpha Peptides are intended strictly for in vitro and laboratory research use only and are not approved for human or veterinary administration.
Structure & Background
Selank was developed as a more stable derivative of tuftsin, a naturally occurring tetrapeptide fragment of IgG that plays a role in immune regulation. The Pro-Gly-Pro extension used in Selank is the same stabilising motif employed in Semax, and similarly confers resistance to peptidase cleavage. This structural feature makes Selank a useful research tool for studying tuftsin-related biological pathways over extended experimental timeframes.
Selank is closely related to Semax in its research profile, and the two peptides are frequently studied in parallel in cognitive and anxiolytic research contexts.
Proposed Mechanisms of Action
- GABAergic modulation: Research suggests Selank may modulate GABA-A receptor activity, which is consistent with its observed anxiolytic effects in animal models. Unlike classical benzodiazepines, Selank’s interaction with GABAergic systems appears to be modulatory rather than direct agonism, which may account for the absence of sedation or dependence in preclinical studies.
- BDNF upregulation: Similar to Semax, Selank has been reported to increase expression of brain-derived neurotrophic factor (BDNF) in the hippocampus, which may contribute to its observed effects on memory and learning in animal models.
- Serotonergic activity: Studies have reported that Selank influences serotonin metabolism in key brain regions, with effects on serotonin turnover proposed as a contributing mechanism to its anxiolytic profile.
- Immunomodulation: As a tuftsin analogue, Selank retains some of the immunomodulatory properties of its parent peptide. Research has reported effects on cytokine expression, including modulation of IL-6 and interferon-gamma, suggesting a role in immune system regulation alongside its central nervous system effects.
- Enkephalin regulation: Selank has been shown to inhibit enkephalin-degrading enzymes, potentially increasing endogenous opioid peptide availability. This mechanism has been proposed as a contributor to its anxiolytic and mood-modulating effects.
Key Research Findings
Anxiolytic Activity
Preclinical studies in rodent models have consistently demonstrated anxiolytic effects of Selank in standard anxiety paradigms including the elevated plus maze, open field test, and light-dark box. Notably, these anxiolytic effects have been observed without the sedation, motor impairment, or amnestic effects typically associated with benzodiazepine anxiolytics, making Selank of interest as a research tool for studying non-sedating anxiolytic mechanisms.
Cognitive Effects
Animal studies have reported improvements in learning and memory consolidation following Selank administration, with effects attributed to BDNF upregulation and enhanced cholinergic transmission. Some studies have reported that Selank reverses memory deficits induced by experimental stress, suggesting a role in stress-related cognitive impairment research.
Stress & HPA Axis Research
Research has investigated Selank’s effects on the hypothalamic-pituitary-adrenal (HPA) axis, with some studies reporting attenuation of stress-induced corticosterone elevation in rodent models. This has generated interest in Selank as a research tool for studying peptide-based modulation of the stress response.
Immunological Research
Studies have reported that Selank modulates the expression of genes involved in immune function, including those encoding cytokines and immune cell surface markers. This dual CNS and immune activity profile makes Selank of interest in research exploring the relationship between the nervous and immune systems (neuroimmunomodulation).
Selank vs Semax: Research Context
Selank and Semax are frequently compared in the research literature as they share structural features (the Pro-Gly-Pro stabilising extension) and overlapping research profiles (both show BDNF upregulation and cognitive effects). The key distinction is their primary research focus: Semax is more associated with cognitive enhancement and neuroprotection, while Selank’s primary research interest lies in anxiolytic activity and stress modulation. Researchers studying neuropsychiatric pathways often investigate both compounds in parallel.
Reconstitution & Storage
Selank should be reconstituted with bacteriostatic water to the required concentration. Store the reconstituted solution at 2–8°C and use within 28–30 days. For full guidance, refer to our Peptide Reconstitution Guide and Storage & Handling Guide.
Research Resources
Researchers can source Selank 10mg (lyophilised) and Selank 10mg Atomised Solution from Alpha Peptides, each supplied with a full COA. For related compounds studied in cognitive and anxiolytic research, explore our Cognitive Research collection. For a comparison with the closely related Semax peptide, see our Semax Research Overview.
Disclaimer: All products sold by Alpha Peptides are intended strictly for in vitro research and laboratory use only. They are not approved for human or veterinary use, and this article does not constitute medical advice.
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