Selank: Anxiolytic Peptide Research and GABA Pathway Modulation
What is Selank?
Selank is a lab-made peptide — a short chain of amino acids, the building blocks of proteins. It is made of seven of them (so scientists call it a heptapeptide, “hepta” meaning seven), with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It is a neuropeptide (a peptide that acts on nerve cells) and is copied from a natural immune-system peptide called tuftsin. In animal studies, researchers have looked at how it calms anxiety-like behaviour (an anxiolytic effect) while affecting the GABA system, which is a calming signal in the brain. These are research observations only, not therapeutic effects. It is supplied strictly as a research reagent for in vitro (test-tube / lab work only) use, not for human or veterinary use.
Selank was made in Russia at the Institute of Molecular Genetics. Scientists took the natural peptide tuftsin (Thr-Lys-Pro-Arg) and added a short Pro-Gly-Pro tail. That tail makes the peptide last much longer before the body’s enzymes break it down. Because it comes from tuftsin, researchers study it not just for behaviour but also for how it affects the immune system and brain chemistry.
Like Semax, the peptide it is often paired with, Selank comes from a long line of Eastern European research. Scientists use it as a tool to study how short peptides change anxiety-like behaviour, brain chemical messengers, and stress responses in animals.
GABAergic and neurotrophic signalling
Selank research focuses on three main areas: how it affects the calming GABA system, how it affects brain growth signals and mood chemicals, and how (because it comes from tuftsin) it affects pain-related signals and the immune system.
GABAergic modulation
The most studied thing about Selank is how it affects the GABA system. GABA is the brain’s main “calming” chemical messenger, and it is the usual target for anti-anxiety compounds. Here is the key point: Selank does not lock onto the same spot that benzodiazepines (common sedative drugs) use. Instead, studies describe it changing how the GABA-A receptor is built and how strongly it responds to GABA — an indirect (allosteric) way of nudging the receptor. Researchers think this is why animal studies show a calming effect without the heavy sedation and clumsy movement you get with benzodiazepines. These are research observations only, not therapeutic effects.
BDNF and monoamine signalling
In rodent studies, Selank has also been linked to more BDNF (brain-derived neurotrophic factor, a protein that helps brain cells grow and survive) in the hippocampus, a part of the brain tied to memory. It has also been linked to serotonin signalling (serotonin is a chemical messenger involved in mood). These pathways relate to memory, mood and coping with stress. This mix of calming and brain-growth effects sets Selank apart from compounds that only sedate.
Enkephalin stability and immune signalling
Because it comes from tuftsin, Selank has also been studied for how it affects enkephalins (natural pain-relieving signals in the body) — it is reported to slow their breakdown — and for effects on the immune system and cytokines (chemical messengers the immune system uses). In short, this is a peptide that links the nervous system and the immune system in research models.
Key research findings
The studies below are good examples of the animal-based Selank research. They are summarised here for science reference only.
Reported that Selank produced anxiolytic effects in rodent elevated-plus-maze models comparable to phenibut and diazepam, but without the motor impairment or sedation seen with classical anxiolytics.
PMID: 19916388
Reported that Selank prevented ethanol-induced memory and attention disturbances and was associated with regulation of BDNF content in the hippocampus and prefrontal cortex, linking its behavioural effects to neurotrophic signalling.
PMID: 31625062
Reported that Selank altered the expression of genes involved in GABAergic neurotransmission, supporting an indirect (non-benzodiazepine) mechanism for its anxiolytic activity.
Selank and Semax
Selank is often studied next to Semax in brain and neuropeptide research. The two work on different but matching pathways — Semax on brain-growth signals (BDNF and NGF, proteins that help nerve cells grow), and Selank on the calming GABA system — so researchers often look at them together. See the Semax research overview for how they pair up, or the Semax vs Selank side-by-side comparison. Both belong to neuropeptide research.
Velox Peptides supply information
Velox Peptides supplies Selank as a lyophilised (freeze-dried) powder at ≥98.9% HPLC-verified purity, with a batch certificate of analysis (a lab report proving what is in the vial) available on request. To work out how to reconstitute it (mix the powder back into a liquid), see the reconstitution calculator. Supplied strictly as a research reagent for in vitro use.
References & further reading
- Seredenin SB, Kozlovskaya MM et al. Selank anxiolytic activity in rodent anxiety models. PMID: 19916388
- Kozlovskaya et al. “Selank, peptide analogue of tuftsin, protects against ethanol-induced memory impairment by regulating BDNF content in the hippocampus and prefrontal cortex in rats.” 2019. PMID: 31625062
- Kozlovskaya MM, Kozlovskii II, Val’dman EA, Seredenin SB. “Selank and short peptides of the tuftsin family in the regulation of adaptive behaviour.” Neuroscience and Behavioral Physiology, 2003.
- Zozulia AA et al. “Efficacy and possible mechanisms of action of a new peptide anxiolytic Selank.” review literature, 2008.
Summaries are paraphrased from the peer-reviewed literature. For full source citations, email veloxpeps@gmail.com.
