Selankとは？研究概要

Selank (TP-7) is a synthetic heptapeptide nootropic and anxiolytic compound developed at the Institute of Molecular Genetics of the Russian Academy of Sciences, created by fusing the naturally occurring immune-regulating tetrapeptide tuftsin (Thr-Lys-Pro-Arg) with a Pro-Gly-Pro stabilizing sequence. This structural modification protects the active tuftsin core from rapid enzymatic degradation, extending its biological half-life and enabling practical administration — typically via intranasal spray. Selank has been approved in Russia for the treatment of generalized anxiety disorder and neurasthenia, though it has not received regulatory approval from the U.S. FDA or European EMA.

Tuftsin, the parent peptide from which Selank is derived, is a natural fragment of the IgG immunoglobulin heavy chain (residues 289-292) and is known for its role in stimulating phagocytosis and modulating immune function. By incorporating tuftsin into a more stable structure, Selank's developers aimed to preserve immune-modulatory activity while adding neurotropic and anxiolytic properties — resulting in a dual-function compound that bridges immunology and neuroscience.

How Does Selank Work?

Selank's mechanism of action involves multiple neurotransmitter systems. Research has demonstrated that it modulates the GABAergic system, enhancing GABA-mediated inhibitory neurotransmission, which is considered the primary basis for its anxiolytic effects. Unlike benzodiazepines, which also target GABA but through direct receptor binding, Selank appears to work through allosteric modulation and by influencing GABA metabolism, avoiding the sedation and dependence risks associated with classical GABA-targeting drugs.

Selank also influences the serotonergic system, with studies showing effects on serotonin metabolism and the expression of serotonin-related genes. Research has documented changes in brain-derived neurotrophic factor (BDNF) expression following Selank administration, which may underlie its cognitive-enhancing and neuroprotective effects. BDNF is critical for neuronal survival, synaptic plasticity, and memory formation. Additionally, Selank has been shown to affect enkephalin metabolism by inhibiting enkephalin-degrading enzymes, which may contribute to its mood-stabilizing properties.

On the immune side, Selank retains tuftsin's ability to stimulate phagocytic activity of monocytes and neutrophils, modulate cytokine expression (including IL-6 and IFN-γ), and influence the balance between Th1 and Th2 immune responses.

Key Research Findings

Study Focus	Model	Key Finding	Year
Anxiety behavior	Rat (elevated plus maze)	Significant anxiolytic effect comparable to benzodiazepines without sedation	2008
BDNF expression	Rat (hippocampus)	Increased BDNF mRNA expression in hippocampal regions after repeated administration	2010
Gene expression profiling	Rat (brain)	Modulation of 36 genes involved in neurotransmission and immune function	2012
Generalized anxiety	Human (clinical)	Reduced anxiety scores with favorable tolerability in a controlled trial	2014
Enkephalin metabolism	Rat (brain)	Inhibition of enkephalin-degrading enzymes leading to elevated endogenous opioid levels	2016

Common Research Applications

• Anxiety and stress research: Selank is primarily studied as an anxiolytic agent, with research showing effects on both behavioral anxiety measures and neurochemical anxiety markers.
• Cognitive enhancement: Memory and learning studies examine Selank's influence on BDNF expression, synaptic plasticity, and information processing in both rodent and human models.
• Immunomodulation: Research explores Selank's dual role as a neuroactive and immune-modulating peptide, particularly regarding cytokine balance and innate immune function.
• Neuroprotection: Studies investigate Selank's potential to protect neurons from oxidative stress, excitotoxicity, and inflammation-mediated damage.
• Mood regulation: Its effects on serotonin, GABA, and endogenous opioid systems make it a subject of interest in depression and mood disorder research.

How Does Selank Compare?

Selank is most commonly compared to Semax, another Russian-developed regulatory peptide. While both are heptapeptides with nootropic properties, they differ significantly in their parent molecules, receptor targets, and primary effects. Selank is derived from tuftsin and primarily targets anxiety and immune function, while Semax is derived from ACTH and primarily targets cognitive performance and neuroprotection. For a comprehensive comparison, see our Selank vs. Semax comparison article. Many researchers study the two peptides together, as their mechanisms are considered complementary rather than overlapping.

Safety and Considerations

Selank has demonstrated a favorable safety profile in both preclinical and clinical studies conducted primarily in Russia. No significant adverse effects, sedation, withdrawal symptoms, or dependence have been reported in the published literature. Unlike benzodiazepines, Selank does not appear to produce cognitive impairment, motor incoordination, or rebound anxiety. However, the majority of clinical studies have been conducted in Russian research institutions, and there is a relative lack of large-scale, Western-standard randomized controlled trials. Selank is not approved by the FDA or EMA. This information is for educational and research purposes only and does not constitute medical advice.

Frequently Asked Questions

How is Selank typically administered in research?

Selank is most commonly administered as an intranasal spray in research settings. The nasal route allows rapid absorption across the nasal mucosa with direct access to the central nervous system via the olfactory pathway, bypassing the blood-brain barrier and first-pass hepatic metabolism. Research doses in published studies have typically ranged from 250 to 750 mcg per day.

Is Selank addictive or does it cause dependence?

Published research has not reported any evidence of physical dependence, tolerance development, or withdrawal symptoms with Selank use. This distinguishes it from benzodiazepines, which carry well-documented risks of dependence and withdrawal. However, long-term dependence studies beyond the typical trial durations are limited.

What is tuftsin and why is it important for Selank?

Tuftsin is a naturally occurring tetrapeptide (Thr-Lys-Pro-Arg) derived from the Fc region of immunoglobulin G. It is released by splenic enzymes and is known for stimulating phagocytic immune cells. Tuftsin forms the active core of Selank, providing the immunomodulatory foundation, while the added Pro-Gly-Pro tail enhances metabolic stability and contributes to the peptide's neurotropic properties.