SNAP-8 Peptide: Research into the Neuronal Regulation of Skin Topography

SNAP-8 (aka Acetyl octapeptide-3) is a synthetic peptide composed of 8 amino acids (Ac-Glu-Glu-Met-Gln-Arg-Arg-Ala-Asp-NH₂). It is produced from the structure of acetyl hexapeptide-3 by adding a chain consisting of 2 amino acids (alanine and aspartame). Based on research from Shin et al., SNAP-8 potentially influences muscle contraction, particularly on superficial muscle cells right under the skin’s layers, resulting in a more relaxed and even textured skin structure in test models.⁽¹⁾ SNAP-8 may also have other potential actions in experimental settings, including interactions with fibroblasts and other skin cells.

Fig. 1 – SNAP-8 Peptide Chemical Structure

SNAP-8 Peptide and Neuromuscular Synapses

SNAP-8 peptide is hypothesized to function by potentially mimicking the N-terminal region of SNAP-25 (Synaptosomal-associated protein of 25 kDa), a protein thought to be essential for neurotransmitter release in neurons. It is suggested by authors such as Nguyen et al., that by imitating this portion of SNAP-25, SNAP-8 may compete for binding with proteins such as syntaxin and synaptobrevin (also known as VAMP).⁽²⁾ Syntaxin is believed to reside on the presynaptic membrane of neurons, while synaptobrevin is presumed to be present on the membranes of synaptic vesicles. Together with SNAP-25, these proteins are posited to form the SNARE complex (Soluble N-ethylmaleimide-sensitive factor Attachment protein Receptor), which might facilitate the fusion of synaptic vesicles with the presynaptic membrane, enabling neurotransmitter release.

It is thought that, under normal conditions, SNAP-25 may bind to syntaxin and synaptobrevin to form a tight SNARE complex that could bring the vesicle and membrane into close proximity, potentially allowing for the release of neurotransmitters such as acetylcholine. However, SNAP-8 might disrupt this process by occupying the binding sites on syntaxin and synaptobrevin, thereby possibly preventing SNAP-25 from engaging with these proteins. This action could inhibit the formation of a functional SNARE complex. Such a disruption is theorized to block the release of acetylcholine, a neurotransmitter that might activate nicotinic receptors on muscle fibers to induce muscle contractions.

By potentially reducing acetylcholine levels, SNAP-8 peptide could decrease the stimulation of these receptors, which may lead to less frequent and weaker muscle contractions. Thus, this reduction in activity is posited to act by “eliminating wrinkles caused by over-stimulated neurons” and improve skin topography, as the muscles might engage less in the repetitive movements that crease the skin.⁽³⁾

SNAP-8 and Contractile Fibroblasts

According to a study in murine models, reported by Avcil et al., SNAP-8 is thought to potentially influence the activity of fibroblasts, particularly dermal contractile fibroblasts, which are cells that may play a role in maintaining skin tension. Contractile fibroblasts are believed to generate mechanical forces in the dermis that help sustain the structural integrity and tightness of the skin. By possibly relaxing these fibroblasts, SNAP-8 peptide may potentially reduce the micro-tensions within the skin, which might lead to a smoother topography. This reduction in tension is theorized to contribute to a decrease in wrinkle depth, and it may also improve overall skin texture. However, the exact mechanisms by which this peptide affects fibroblast activity and its long-term impact on dermal contractile fibroblasts remain a subject of ongoing investigation.⁽³⁾

SNAP-8 Peptide and Skin Topography

A study by Gorouhi et al., proposes that SNAP-8 peptide might potentially act in synergy with other bioactive compounds, such as hyaluronic acid, to possibly improve overall skin topography in test models. Specifically, it suggests that this combination may enhance several skin parameters, as researchers observed a potential reduction in wrinkle depth by an average of 25.8%, while skin hydration improved by 15.4%. Additionally, there was an apparent increase in dermal density, possibly by 14.2%, and thickness by an estimated 12.9%.⁽³⁾

Further research by Veiga et al., suggests that regular exposure to 10% SNAP-8 peptide for four weeks may lead to a potential mean reduction in wrinkle depth of 34.98%, with the maximum estimated reduction potentially reaching 62-63%. However, these findings still warrant further investigation to confirm the consistency and broader applicability of these effects.⁽⁴⁾⁽⁵⁾

 
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References:

1. Shin, J. Y., Han, D., Yoon, K. Y., Jeong, D. H., & Park, Y. I. (2024). Clinical Safety and Efficacy Evaluation of a Dissolving Microneedle Patch Having Dual Anti-Wrinkle Effects With Safe and Long-Term Activities. Annals of dermatology, 36(4), 215–224. https://doi.org/10.5021/ad.23.136
2. Nguyen, T. T. M., Yi, E. J., Jin, X., Zheng, Q., Park, S. J., Yi, G. S., … & Yi, T. H. (2024). Sustainable Dynamic Wrinkle Efficacy: Non-Invasive Peptides as the Future of Botox Alternatives. Cosmetics (2079-9284), 11(4).
3. Avcil, M., Akman, G., Klokkers, J., Jeong, D., & Çelik, A. (2020). Efficacy of bioactive peptides loaded on hyaluronic acid microneedle patches: A monocentric clinical study. Journal of cosmetic dermatology, 19(2), 328–337. https://doi.org/10.1111/jocd.13009
4. Gorouhi, F., & Maibach, H. I. (2010). Topical peptides and proteins for aging skin. Textbook of Aging Skin; Farage, MA, Miller, KW, Maibach, HI, Eds, 1-33.
5. Veiga, E., Ferreira, L., Correia, M., Pires, P. C., Hameed, H., Araújo, A. R., … & Paiva-Santos, A. C. (2023). Anti-aging peptides for advanced skincare: focus on nanodelivery systems. Journal of Drug Delivery Science and Technology, 105087.
6. Figure 1: https://pubchem.ncbi.nlm.nih.gov/image/imgsrv.fcgi?cid=86080331&t=l