Strengthening the Skin Barrier by Using a Late Cornified Envelope 6A-Derived Biomimetic Peptide

Area of Science:

• Dermatology
• Biochemistry
• Molecular Biology

Background:

• Cornified envelope (CE) components are vital for epidermal barrier homeostasis.
• Alterations in CE expression are linked to skin pathologies and aging.
• LCE6A is a key protein within the Late Cornified Envelope family.

Purpose of the Study:

• To characterize the LCE6A protein and its role in CE formation.
• To develop and evaluate a biomimetic peptide derived from LCE6A for skin protection and anti-aging effects.

Main Methods:

• Immunohistochemistry and immunoblotting to confirm LCE6A expression during epidermal differentiation.
• In situ and in vitro crosslinking assays to determine LCE6A's substrate properties for transglutaminases.
• In vitro and ex vivo studies on human skin explants to assess peptide P26's mechanical resistance and protective properties.
• Two double-blind, vehicle-controlled clinical trials to evaluate P26's efficacy in protecting skin barrier, limiting damage, and improving signs of aging.

Main Results:

• LCE6A is expressed late in epidermal differentiation and functions as a transglutaminase substrate, crosslinking into CEs.
• LCE6A-derived peptides, including P26, reinforce CE mechanical resistance.
• P26 demonstrated significant ex vivo skin protection and improved skin firmness and roughness in clinical trials.
• P26 effectively protected against barrier disruption and limited damage from compromised skin barriers.

Conclusions:

• LCE6A is a functional component of the cornified envelope, essential for epidermal barrier integrity.
• The LCE6A-derived peptide P26 offers a novel mechanism for enhancing skin barrier function.
• P26 shows potential as a cosmetic ingredient and pharmacological agent for skin protection and anti-aging therapies.