In vitro chemopreventive efficacy screening using human keratinocytes and the in vivo data correlation

Area of Science:

• Oncology
• Cell Biology
• Toxicology

Background:

• Cancer chemoprevention research seeks agents to prevent or delay cancer development.
• In vitro assays are crucial for initial screening of potential chemopreventive compounds.
• The Human Epidermal Cell (HEC) Assay utilizes keratinocyte cultures to assess agent efficacy.

Purpose of the Study:

• To evaluate the efficacy of potential cancer preventive agents using the HEC Assay.
• To determine the predictive value of the HEC Assay for in vivo cancer prevention models.

Main Methods:

• Screening of twenty-eight agents for chemopreventive activity.
• The HEC Assay measures inhibition of propane sultone-induced changes in keratinocytes.
• Assay biomarkers include calcium tolerance, growth inhibition, and involucrin induction, alongside cytotoxicity assessment.

Main Results:

• A positive response in the HEC Assay correlated 100% with positive outcomes in animal cancer prevention models (16/16).
• The HEC Assay demonstrated an 84% overall sensitivity in predicting efficacy in animal models.
• Non-toxic doses of agents were used for evaluation in the HEC Assay.

Conclusions:

• The HEC Assay is a valuable tool for screening cancer chemopreventive agents.
• A positive result in the HEC Assay is highly predictive of in vivo efficacy.
• The assay provides insights into cytotoxicity following acute and chronic exposure.