Selank: a Russian-developed research peptide

Selank is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) developed in Russia as a stabilized analogue of the immunopeptide tuftsin. It is a frequent subject of CIS preclinical literature on anxiolytic mechanisms, neurotrophic signalling and neuro-immune crosstalk.

Origin and molecular design

Selank was designed at the Institute of Molecular Genetics of the Russian Academy of Sciences together with the V.V. Zakusov Institute of Pharmacology. Its structure derives from tuftsin, the endogenous immunomodulatory tetrapeptide (Thr-Lys-Pro-Arg) released during enzymatic degradation of immunoglobulin G. Native tuftsin is rapidly cleaved by aminopeptidases, which limits its usefulness as a research probe. Selank addresses this by appending a C-terminal Pro-Gly-Pro extension, yielding the heptapeptide Thr-Lys-Pro-Arg-Pro-Gly-Pro (CAS 129954-34-3, molecular formula C33H57N11O9, approximate mass 751.9 g/mol). The proline-rich tail confers marked resistance to peptidase cleavage and improves metabolic stability relative to the parent tetrapeptide, the same stabilization strategy applied to the related peptide Semax. As a CIS-native compound, Selank features prominently in Russian-language pharmacological literature and is supplied strictly as a reference reagent for in-vitro and laboratory research by qualified investigators.

Reported mechanisms in research models

Preclinical literature describes several signalling pathways through which Selank has been studied in cell and animal models. Reports document interaction with the GABAergic system, with experiments examining modulation of GABA-A receptor expression and inhibitory neurotransmission as a proposed basis for anxiolytic-type effects observed in rodent behavioural paradigms. Studies also report changes in monoaminergic signalling, including serotonergic and dopaminergic markers, and modulation of enkephalin-degrading enzyme activity, which has prompted interest in endogenous opioid and stress-response pathways. Because the molecule is a tuftsin derivative, a substantial body of work also addresses neuro-immune signalling, including effects on cytokine expression and immune-cell function. These findings are derived from in-vitro assays and animal experiments reported in the literature and are presented here strictly as mechanistic research context, not as any indication of effects in humans.

BDNF and neurotrophic signalling

A recurring theme in Selank research is its reported influence on neurotrophic gene expression. Several rodent studies describe altered expression of brain-derived neurotrophic factor (BDNF) and its receptor signalling in hippocampal tissue following peptide administration in experimental models, alongside changes in the expression of genes linked to synaptic plasticity, neurogenesis and oxidative-stress response. Microarray and transcriptomic analyses reported in CIS literature have been used to map broad gene-expression patterns associated with the peptide in brain tissue. This neurotrophic angle is frequently discussed together with the GABAergic findings, since both are proposed as candidate substrates for the anxiolytic and cognition-related phenotypes seen in animal paradigms. For researchers, BDNF and associated plasticity markers represent measurable endpoints in mechanistic studies. All such data remain confined to in-vitro systems and laboratory animal models and carry no human-use implication whatsoever.

Laboratory handling and reagent context

As supplied for research, Selank is a lyophilized white powder that is typically reconstituted in sterile water or appropriate aqueous buffer for in-vitro assay work, with stock solutions handled under sterile technique. Lyophilized peptide is generally stored frozen and protected from light and repeated freeze-thaw cycles, while reconstituted material is kept refrigerated and used within a limited window to preserve integrity; investigators should follow the storage and stability data provided on the Certificate of Analysis for each batch. Identity and purity for research-grade material are characterized by HPLC and mass spectrometry, and a per-lot Certificate of Analysis documents sequence, purity and mass. Peptiko supplies Selank only as a reference reagent for in-vitro and laboratory research by qualified researchers and laboratories. It is not a drug, supplement, cosmetic or food, and nothing here describes or endorses human or animal administration.

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