Selank: Research Overview and Mechanism

Selank is a synthetic heptapeptide (sequence TKPRPGP) whose N-terminal tetrapeptide is tuftsin, a naturally occurring immunomodulatory peptide, extended at the C-terminus with a proline-glycine-proline sequence. That proline-rich extension is studied as a stabilizing motif: it slows cleavage by peptidases and gives Selank a longer research half-life than native tuftsin, which is otherwise short-lived. It was developed in Russia at the Institute of Molecular Genetics as a stabilized tuftsin analog.

This construction places Selank at the intersection of neuropeptide and immunopeptide research, and it is used as a compact tool compound for probing both signaling areas in laboratory models.

In research, Selank is investigated within GABAergic and monoaminergic neurotransmission and within tuftsin-related immunomodulation. Preclinical literature has examined its association with GABA-mediated signaling, with the metabolism of serotonin and other monoamines, and with expression of brain-derived neurotrophic factor (BDNF) in CNS models. As a tuftsin analog it is separately studied for effects on cytokine and interleukin expression, and it is reported to influence the activity of enkephalin-degrading enzymes, which is one proposed route by which it stabilizes endogenous regulatory peptides. It is frequently referenced alongside the ACTH-derived peptide Semax as a complementary CNS tool compound.

Beyond preclinical work, Selank has a public clinical research record in Russia, where it has been examined in clinical studies within generalized anxiety disorder and related anxiety endpoints and is described in Russian sources as a registered anxiolytic. This states the third-person research and regulatory record and is not a human-use claim for the material supplied here. These descriptions refer to research applications reported in neuropeptide and immunopeptide literature, not to human outcomes.

Pinnacle Selank ships as a 10mg lyophilized powder of the heptapeptide TKPRPGP (molecular formula C33H57N11O9, near 752 g/mol). As a short, unmodified peptide it lacks the disulfide bridges or acylation that stabilize larger constructs, so it dissolves readily in bacteriostatic water but is best aliquoted to limit freeze-thaw once in solution. Store the sealed vial at -20°C protected from light, add solvent gently against the vial wall rather than onto the pellet, then refrigerate the solution and reconcile identity against the lot-matched Certificate of Analysis, which reports 99% or higher purity by HPLC and mass spectrometry.