Selank: A Laboratory Research Reference

Selank is a synthetic heptapeptide derived from the immunomodulatory tetrapeptide tuftsin. It is studied in laboratory research for its anxiolytic and neuroprotective activity in experimental models.

This page is a non-promotional scientific reference for researchers. It summarises the chemical identity, molecular characteristics, mechanism as described in the literature, research areas, and analytical testing of selank. It does not provide dosing, therapeutic, or human-use guidance of any kind. Selank supplied by Bulk Aussie Peptides is for laboratory research purposes only.

What Is Selank?

Selank is a synthetic heptapeptide based on tuftsin, an endogenous immunomodulatory tetrapeptide (Thr-Lys-Pro-Arg). As with its relative semax, a defining design feature is the addition of a Pro-Gly-Pro sequence to the carboxy terminus to protect the peptide from enzymatic degradation. Selank is conventionally written Thr-Lys-Pro-Arg-Pro-Gly-Pro.

For background on how synthetic research peptides are produced and verified, see the synthetic peptides research guide.

Molecular Characteristics

Several molecular properties are used to identify selank in analytical documentation:

• Classification: a synthetic tuftsin-derived heptapeptide, classed among anxiolytic research peptides.
• Sequence: Thr-Lys-Pro-Arg-Pro-Gly-Pro, incorporating a carboxy-terminal Pro-Gly-Pro motif.
• Molecular weight: reported in Daltons (Da) on product documentation; the measured value on a Certificate of Analysis should be compared against the theoretical mass derived from the sequence.
• Physical form: supplied as a lyophilised (freeze-dried) powder, the standard presentation for research peptides.

How Selank Works

Selank is studied for effects described as anxiolytic and neuroprotective. Research reports that selank is associated with upregulation of brain-derived neurotrophic factor (BDNF) and modulation of inflammation-related cytokines such as IL-6, and it has been investigated in immune-stress models. It differs from semax in its parent structure (tuftsin rather than ACTH) and in lacking a reported vascular-endothelial-growth-factor angiogenic mechanism.

These observations are preclinical and describe peptide activity in model systems; they do not constitute a therapeutic use.

Areas of Scientific Research

The research literature describes several lines of investigation involving selank:

• Anxiolytic research: studies in behavioural models of anxiety.
• Neuroprotection: investigation of BDNF upregulation and inflammatory modulation.
• Immunomodulation: work examining effects on cytokine production and immune-cell balance.

These investigations are conducted in vitro or in approved animal research models under institutional oversight. They do not translate to approved human use.

Analytical Testing

As with other research peptides, selank is characterised using:

• HPLC for purity assessment, reported as a percentage of total peak area.
• Mass spectrometry for identity confirmation, by comparing measured molecular mass to the theoretical value.

Guidance on interpreting the resulting documents is available in the article on how to read a peptide Certificate of Analysis.

Storage and Handling

In a laboratory context, lyophilised selank is typically stored in a freezer, protected from light and moisture, and handled according to the product-specific documentation. Once reconstituted, the resulting solution is refrigerated and used within the timeframe stated in the documentation. General guidance is covered in the peptide storage and stability reference.

Frequently Asked Questions

• What is selank? Selank is a synthetic heptapeptide derived from the immunomodulatory tetrapeptide tuftsin.
• What is the selank sequence? It is conventionally written Thr-Lys-Pro-Arg-Pro-Gly-Pro.
• What is selank studied for? It is investigated in laboratory models for anxiolytic, neuroprotective, and immunomodulatory activity.
• What is tuftsin? Tuftsin is an endogenous immunomodulatory tetrapeptide from which selank is derived.
• How is selank purity tested? Purity is commonly estimated by HPLC, while identity is confirmed by mass spectrometry.

References

• Kolomin, T., Shadrina, M., Slominsky, P., et al. (2018). Peptide-based anxiolytics: the molecular aspects of the heptapeptide selank biological activity. Protein & Peptide Letters, 25(10), 914–923.
• Medvedeva, E. V., Dmitrieva, V. G., Limborska, S. A., et al. (2020). Functional connectomic approach to studying selank and semax effects. PubMed 32342318 — a resting-state functional-imaging comparison of the two peptides.

Related Research Resources

• Semax: A Laboratory Research Reference — a related ACTH-fragment-derived heptapeptide.
• Synthetic Peptides: Research Guide — how research peptides are produced and verified.
• DSIP: A Laboratory Research Reference — a peptide studied in sleep-related research.