Selank is a synthetic heptapeptide derived from the endogenous immunomodulatory peptide tuftsin (Thr-Lys-Pro-Arg) with an added Pro-Gly-Pro sequence that confers proteolytic stability. It was developed at the Institute of Molecular Genetics in Russia and has been studied in that country for applications in anxiety and cognitive function research for over two decades.
GABAergic and Serotonergic Modulation
Selank research has documented effects on both GABAergic and serotonergic neurotransmitter systems. Unlike benzodiazepines, which achieve anxiolytic effects through direct GABA-A receptor modulation, Selank appears to act through a more complex mechanism involving GABA system regulation and serotonin metabolism. Studies report normalization of serotonin transporter expression in stress models without the receptor downregulation associated with direct serotonergic agents.
BDNF Expression
One of the more reproducible findings across Selank studies is upregulation of brain-derived neurotrophic factor (BDNF). BDNF is essential for neuronal survival, synaptic plasticity, and long-term potentiation. Elevated BDNF following Selank administration has been observed in both animal models and human studies, making it relevant for researchers examining neuroplasticity and anxiety-related neurobiological changes.
Cognitive Research
Selank has been studied for its effects on learning, memory consolidation, and attention in both animal and limited human research. Improvements in working memory and learning speed have been reported in several animal models. A small number of controlled human trials, primarily from Russian institutions, have reported improvements in attention and cognitive flexibility.
Stability and Administration Routes
Selank is notably more stable than many peptides due to its Pro-Gly-Pro tail, which resists enzymatic degradation. It has been studied via intranasal administration, which allows direct uptake via the olfactory pathway and bypasses first-pass metabolism. Subcutaneous administration is also used in research contexts.
For in vitro research use only. Not for human or veterinary use, therapeutic, or diagnostic purposes.