New Skin-Relevant Cell Coculture Model With Stratum Corneum-Like Layer

Area of Science:

• Dermatology
• Cell Biology
• Cosmetic Science

Background:

• Traditional 2D cell cultures (fibroblasts, keratinocytes) lack the stratum corneum, limiting their utility in skin-active agent discovery.
• The stratum corneum acts as a barrier, affecting compound permeation and bioactivity.
• Reconstituted epidermis models are effective but costly and time-consuming.

Purpose of the Study:

• To develop a simplified 2D cell culture model that incorporates a hydrophobic barrier mimicking the stratum corneum.
• To evaluate the model's performance with various compounds and assess cell viability and collagen stimulation.

Main Methods:

• A novel 2D cell culture system with an integrated stratum corneum-substitute barrier was developed.
• The model was tested using skin-relevant solvents and both hydrophilic and encapsulated active compounds.
• Readouts included cell viability and collagen stimulation assays.

Main Results:

• The stratum corneum-substitute barrier reduced the cytotoxicity of dimethyl isosorbide (DMI).
• Compound bioactivity (magnesium ascorbyl phosphate [MAP] and oligomeric proanthocyanidins [OPCs]/levan biopolymer) became dependent on penetration through the lipidic barrier.
• The model demonstrated modified compound interactions compared to conventional 2D cultures.

Conclusions:

• The proposed model offers a more physiologically relevant alternative to conventional 2D cell cultures for skin-active agent discovery.
• Incorporating a barrier enhances the assessment of compound efficacy and safety by simulating skin's natural defenses.
• This approach improves the workflow for identifying and analyzing compounds with potential dermatological applications.