DNA-cell-binding (DCB) assay for suspected carcinogens and mutagens

Area of Science:

• Toxicology
• Molecular Biology
• Biochemistry

Background:

• Carcinogens induce DNA damage, forming adducts with nucleic acids and proteins.
• These adducts can involve proteins in prokaryotic and eukaryotic cell membranes.
• Increased DNA attachment to cells indicates potential carcinogenicity.

Purpose of the Study:

• To introduce and validate the DNA-cell-binding (DCB) assay for screening potential carcinogens and mutagens.
• To compare the DCB assay's performance against established animal assays and other rapid methods.
• To assess the combined predictive power of the DCB assay with DNA-protein adduct measurements.

Main Methods:

• Developed the DNA-cell-binding (DCB) assay based on DNA-macromolecule interactions.
• Tested approximately 280 chemicals, including 130 with known carcinogenic status.
• Compared DCB assay results with traditional animal carcinogenicity assays.
• Evaluated combined DCB assay and DNA-protein adduct data for enhanced predictability.

Main Results:

• The DCB assay demonstrated high agreement (96%) with animal assays for predicting carcinogenicity.
• The DCB assay proved superior to other macromolecular complex detection methods.
• Combining DCB assay results with DNA-protein adduct measurements in human cells increased predictability to 100%.

Conclusions:

• The DCB assay is a reliable and efficient method for screening potential carcinogens and mutagens.
• It offers a favorable alternative to existing rapid screening techniques.
• The DCB assay, alone or combined with other methods, is recommended for evaluating chemical carcinogenic potential.