What Is Selank?

Overview

Selank is a synthetic heptapeptide built around the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro (molecular formula C₃₃H₅₇N₁₁O₉). It was engineered from tuftsin, a naturally occurring immunomodulatory tetrapeptide (Thr-Lys-Pro-Arg), by appending a Pro-Gly-Pro tail that improves metabolic stability while preserving regulatory activity. In the research literature it is treated as a "regulatory" or nootropic-anxiolytic neuropeptide rather than a compound with a single, well-defined receptor target.

How Selank Works

Selank does not act through one confirmed receptor; instead, studies describe a network of overlapping neurochemical and gene-expression effects. Proposed mechanisms include modulation of GABAergic signalling and possible allosteric influence on GABA_A receptors, shifts in serotonin and dopamine pathway activity, and inhibition of enkephalin-degrading enzymes that prolongs endogenous opioid-peptide signalling. One rat experiment that profiled 84 neurotransmission-related genes reported altered expression in roughly 45 of them one hour after administration and about 22 at the three-hour mark, illustrating how broadly the compound shifts transcriptional activity. Because tuftsin carries immune-signalling roles, neuroimmune crosstalk is also frequently raised as part of its mechanism.

What the Research Explores

• Anxiety-like behaviour and stress-response models, including comparisons with benzodiazepine reference agents.
• GABAergic and serotonergic gene-expression and neurotransmission pathways.
• Learning, memory consolidation and age-related cognitive decline.
• Enkephalin-degrading enzyme activity and endogenous opioid-peptide turnover.
• Neuroimmune signalling and possible neuroprotective effects in preclinical settings.
• Interaction studies with psychoactive drugs such as diazepam and olanzapine.

Forms & Handling

Selank is generally supplied as a lyophilized powder in multi-milligram research vials. For laboratory work it is reconstituted with bacteriostatic or sterile water and kept refrigerated once in solution; lyophilized vials are stored frozen and protected from light for longer-term stability. In published studies the most common experimental routes are intranasal application and subcutaneous injection. See the dosing protocol below for reconstitution math expressed in insulin-syringe units.

Safety & Research Notes

Selank is an investigational research compound with no approved human or veterinary indication. It is not FDA-approved, and U.S. regulators have listed selank acetate among nominated compounding substances flagged for potential safety risks, citing insufficient human safety data and immunogenicity concerns for certain routes. Its long-term safety profile, drug-interaction behaviour, and use in pregnant, pediatric or geriatric populations remain inadequately characterized. The absence of prominent adverse effects in small early studies does not establish that it is free of side effects. Everything described here is mechanistic background, not a usage recommendation.

References

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