Study summary · research use only
Enhanced delivery of hydrophilic peptides in vitro by transdermal microneedle pretreatment
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this in vitro study using porcine ear skin, the effect of solid microneedle (150 µm in length) pretreatment on transdermal delivery of hydrophilic peptides was examined, along with the relationship between peptide permeation rates and D2O flux. Four model peptides were tested: tetrapeptide-3 (456.6 Da), hexapeptide (498.6 Da), acetyl hexapeptide-3 (889 Da), and oxytocin (1007.2 Da). The abstract reports that peptide permeation across the skin was significantly enhanced by microneedle pretreatment, with permeation rates dependent on peptide molecular weight, and that a positive correlation was found between D2O flux and acetyl hexapeptide-3 clearance, suggesting convective solvent flow contributes to enhanced peptide delivery.
Abstract
The aims of this study were to investigate the utility of solid microneedle arrays (150 µm in length) in enhancing transdermal delivery of peptides and to examine the relationship between peptide permeation rates and D2O flux. Four model peptides were used (Gly-Gln-Pro-Arg [tetrapeptide-3, 456.6 Da], Val-Gly-Val-Ala-Pro-Gly [hexapeptide, 498.6 Da], AC-Glu-Glu-Met-Gln-Arg-Arg-NH2 [acetyl hexapeptide-3, 889 Da] and Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH2 [oxytocin, 1007.2 Da]). The influence of microneedle pretreatment on skin permeation was evaluated using porcine ear skin with Franze diffusion cell. Peptide permeation across the skin was significantly enhanced by microneedle pretreatment, and permeation rates were dependent on peptide molecular weights. A positive correlation between D2O flux and acetyl hexapeptide-3 clearances suggests that convective solvent flow contributes to the enhanced transdermal peptide delivery. It is concluded that solid microneedle arrays are effective devices to enhance skin delivery of peptides.
pepmg summarizes the peer-reviewed literature and links to every source — it sells nothing, ships nothing, and gives no medical, dosing, or human-use guidance. Don't just trust this summary: follow the citation to its source and read it yourself. Research use only.