A Novel Microfluidic System for 3D Epidermis and Full-Thickness Skin Growth for Nanoparticle Safety Assessment.

Summary

The authors developed a modular, perfused skin-on-chip capable of growing epidermis-only and full-thickness human skin equivalents with native-like morphology and barrier. The system maintained metabolic activity and supported nanoparticle exposure studies (e.g., TiO2), addressing key gaps in cosmetic nanoparticle safety testing.

Key Findings

• Developed a dynamic perfusion, modular skin-on-chip supporting both epidermis-only and full-thickness models.
• Models exhibited enhanced barrier function, metabolic activity, and native-like skin morphology compared with static cultures.
• Demonstrated feasibility for nanoparticle toxicity assessment through exposure to titanium dioxide nanoparticles.

Clinical Implications

Improved preclinical safety pipelines for cosmetic ingredients containing nanoparticles, potentially informing regulatory standards and reducing human risk before market entry.

Limitations

• In vitro platform without clinical outcome validation
• Limited nanoparticle chemistries and doses reported; inter-laboratory reproducibility not yet established

Future Directions

Expand to diverse nanoparticle chemistries and doses, include immune/appendage components, conduct inter-lab validation, and align protocols with regulatory acceptance.