Acetyl Hexapeptide-8 (Argireline)
Acetyl hexapeptide-8, sold to formulators as Argireline, is a six-residue peptide modeled on the N-terminal end of the neuronal protein SNAP-25, designed to compete for a place in the SNARE complex that drives neurotransmitter release.
The idea came from membrane-fusion research. Gutierrez et al., Journal of Biological Chemistry, 1997 (PMID 9006897) showed that a synthetic peptide mimicking a short stretch of SNAP-25 inhibited secretory vesicle docking in bovine chromaffin cells, establishing that small SNAP-25 fragments can interfere with the protein machinery cells use to release their cargo.
Argireline applied that principle to a cosmetic ingredient. Blanes-Mira et al., International Journal of Cosmetic Science, 2002 (PMID 18498523) designed the acetylated hexapeptide Ac-EEMQRR-NH2 from the SNAP-25 N-terminus and reported that it interfered with assembly of the SNARE complex and inhibited calcium-dependent catecholamine release in permeabilized chromaffin cells, the mechanism it was built to target.
For where it sits among cosmetic peptides, Gorouhi and Maibach, International Journal of Cosmetic Science, 2009 (PMID 19570099) group topical peptides into signal, enzyme-inhibitor, neurotransmitter-inhibitor and carrier families, and place acetyl hexapeptide-8 in the neurotransmitter-inhibitor group, alongside the matrix-signal peptides covered in Palmitoyl Pentapeptide-4.
Lab readouts like these are covered in Cell-migration readouts, in plain lab language. This note summarizes published biochemical and cell research. It is not skincare, dosing, or human-use guidance.