Evaluation of the skin irritation using a DNA microarray on a reconstructed human epidermal model

Area of Science:

• Toxicology
• Dermatology
• In Vitro Methods

Background:

• Animal testing for skin irritancy is ethically and practically challenging.
• Reconstructed human epidermis models offer a promising in vitro alternative.
• Identifying sensitive biomarkers for mild irritants is crucial for accurate assessment.

Purpose of the Study:

• To establish and validate an in vitro method for evaluating skin irritancy using reconstructed human epidermis.
• To assess the utility of DNA microarrays in detecting gene expression changes induced by mild irritants.
• To identify novel and known biomarkers of skin irritation.

Main Methods:

• Utilized the LabCyte EPI-MODEL, a reconstructed human epidermis model.
• Applied a mild irritant, sodium dodecyl sulfate (SDS), at varying concentrations.
• Analyzed gene expression using DNA microarray, quantitative reverse-transcription polymerase chain reaction (RT-PCR), and ELISA.

Main Results:

• DNA microarray identified significant induction of 10 out of 205 genes by SDS.
• Confirmed induction of interleukin-1 alpha (IL-1α) expression and secretion.
• RT-PCR validated the upregulation of key genes including IL-1RN, FOSL1, HSPA1, MYD88, IL-1β, and IL-8.

Conclusions:

• DNA microarrays are effective tools for sensitive and efficient evaluation of mild skin irritation.
• This in vitro approach provides a reliable alternative to animal testing for skin irritancy assessments.
• Gene expression profiling in reconstructed epidermis aids in understanding irritation mechanisms.