Cell-penetrating peptides (5-30 amino acids) can penetrate skin by interacting with lipid structures between skin cells, offering a needle-free strategy for delivering large therapeutic molecules through the skin.
5-30 amino acidsCPP length range enabling skin penetration through stratum corneum lipid structures
What the researchers found
CPPs penetrate skin through molecular interactions with the lipid lamellar structure between corneocytes in the stratum corneum, enabling transdermal delivery of macromolecules for therapeutic and cosmetic applications.
Why it matters
Many effective drugs (including peptides, proteins, and nucleic acids) cannot be taken orally and require injection. CPP-based transdermal delivery could eliminate needles for some treatments, improving patient compliance and enabling new therapeutic applications.
The numbers in context
CPPs consist of 5-30 amino acids with intracellular transduction abilities.
How the study worked
Narrative review of published literature on cell-penetrating peptide transduction mechanisms, transdermal applications, skin penetration pathways, and safety profiles.
Who was studied
Review of CPP transdermal delivery research
What this study cannot tell us
Review article summarizing existing research — no new experimental data. Skin penetration mechanisms are still not fully understood at the molecular level. Translation from lab studies to commercial products remains challenging. Safety of long-term CPP skin exposure needs more investigation.
How to read the evidence
Preliminary to moderate evidence compiled from multiple studies. Review provides a useful overview but individual findings vary in evidence quality.
When this study was published
Published in 2024. Captures current understanding of an actively evolving research field.
The bigger picture
The growth of peptide therapeutics has created urgent demand for needle-free delivery methods. Transdermal CPP delivery sits at the intersection of peptide engineering and drug delivery innovation, potentially transforming how patients receive peptide-based treatments in the future.
Questions still open
- Can CPP-based transdermal delivery achieve therapeutic blood levels comparable to injection for peptide drugs like semaglutide?
- What determines which CPP sequences are best suited for skin versus cellular penetration?
- How do skin conditions (eczema, aging, wounds) affect CPP transdermal performance?
Common questions
What are cell-penetrating peptides?
Could this technology replace injections for peptide drugs?
Read the original research
Transdermal Properties of Cell-Penetrating Peptides: Applications and Skin Penetration Mechanisms.
ACS applied bio materials, 7(1), 1-16
Citation
Shin, Hee Je; Lee, Byung Kyu; Kang, Hyun Ah. (2024). Transdermal Properties of Cell-Penetrating Peptides: Applications and Skin Penetration Mechanisms.. ACS applied bio materials, 7(1), 1-16. https://doi.org/10.1021/acsabm.3c00659