What Is Selank? A Quick Research Overview

Selank is a synthetic heptapeptide developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. It is based on the naturally occurring immunopeptide tuftsin (Thr-Lys-Pro-Arg) with an added Gly-Pro extension that enhances its stability and biological half-life. Selank has been approved as a prescription anxiolytic in Russia since 2009.

What Is Selank and How Does It Work?

Tuftsin is a tetrapeptide naturally produced by enzymatic cleavage of immunoglobulin G (IgG) in the spleen. It modulates immune function and has been found to affect the central nervous system. Selank extends tuftsin’s sequence (Thr-Lys-Pro-Arg-Pro-Gly-Pro) to improve metabolic stability while maintaining and expanding its biological activities.

Selank’s mechanism of action is multifaceted. It influences the expression of brain-derived neurotrophic factor (BDNF), modulates serotonergic and GABAergic neurotransmission, and affects the expression of genes encoding enkephalin — endogenous opioid peptides involved in mood regulation. Unlike benzodiazepines, Selank does not appear to produce sedation, dependence, or withdrawal effects in research models (PMID: 18577768).

Research has shown Selank affects over 50 genes involved in GABAergic and serotonergic neurotransmission, inflammation, and apoptosis — a broad neuromodulatory profile for such a small peptide.

Key Research Highlights

Anxiolytic Effects: Animal and human studies demonstrate Selank’s anxiolytic properties comparable to benzodiazepines but without sedation, cognitive impairment, or dependence risk (PMID: 18577768).

BDNF Expression: Selank has been shown to increase BDNF expression in the hippocampus, a region critical for learning, memory, and emotional regulation (PMID: 25747365).

Immune-Neuro Crossover: As a tuftsin analog, Selank retains immunomodulatory properties while adding CNS effects — making it a subject of research at the intersection of psychoneuroimmunology.

Gene Expression: Microarray analysis showed Selank affects genes involved in inflammation, apoptosis, and neurotransmitter systems within one hour of administration in animal models.

Quick Reference

Property	Detail
Full Name	Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro)
Amino Acids	7 (heptapeptide)
Molecular Weight	~751 Da
Based On	Tuftsin + Pro-Gly-Pro extension
Regulatory Status	Approved in Russia (2009)
Primary Research Areas	Anxiolytic, nootropic, immunomodulation
Key Mechanism	BDNF, GABA/serotonin modulation, enkephalin expression
Storage	Lyophilized: -20°C | Reconstituted: 2-8°C

Further Reading

For a comprehensive analysis including full mechanism breakdowns and complete reference tables, see our Full Selank Research Guide →

Also relevant: Nootropic Peptides Compared | Semax Research Guide

Written by NorthPeptide Research Team