Applicability of Scrape Loading-Dye Transfer Assay for Non-Genotoxic Carcinogen Testing

Area of Science:

• Toxicology
• Cell Biology
• Carcinogenesis

Background:

• Dysregulation of gap junction intercellular communication (GJIC) is a hallmark of non-genotoxic carcinogens (NGTxC).
• In vitro assays for GJIC are needed for integrated approaches to testing and assessment (IATA) of NGTxC.
• The scrape loading-dye transfer (SL-DT) assay is a candidate for evaluating GJIC.

Purpose of the Study:

• To systematically review literature on the SL-DT assay's use in assessing GJIC.
• To evaluate the predictive capacity (sensitivity, specificity, accuracy) of the SL-DT assay for identifying carcinogens.
• To determine the applicability of the SL-DT assay for NGTxC testing within IATA frameworks.

Main Methods:

• Systematic literature search for studies using the SL-DT assay in WB-F344 rat liver epithelial cells.
• Analysis of chemical treatments including environmental toxicants, drugs, and tumor promoters.
• Comparison of SL-DT assay findings with known carcinogenicity and tumor-promoting activity of chemicals.

Main Results:

• The SL-DT assay has been frequently used to assess chemical effects on GJIC in toxicological and tumor promotion research.
• Data were gathered on various chemical classes, including toxicants and tumor promoters.
• The review discusses the assay's predictive capacity for identifying carcinogens.

Conclusions:

• The SL-DT assay is a valuable tool for the functional evaluation of GJIC in vitro.
• Findings from SL-DT assays provide insights into the carcinogenicity of tested chemicals.
• The SL-DT assay holds potential for NGTxC testing within IATA frameworks.