Sulfotransferases and acetyltransferases in mutagenicity testing: technical aspects

Area of Science:

• Biochemistry
• Toxicology
• Genetics

Background:

• Sulfotransferases (SULTs) and N-acetyltransferases (NATs) are crucial for activating mutagens and carcinogens.
• Standard in vitro mutagenicity tests lack endogenous SULTs and may not accurately reflect human NAT activity.
• Existing external activation systems face challenges with cofactor availability and product cell penetration.

Purpose of the Study:

• To develop improved in vitro mutagenicity test systems by incorporating human SULTs and NATs.
• To identify critical human enzyme forms for accurate carcinogen activation assessment.
• To enhance the reliability and relevance of mutagenicity testing for human health risk evaluation.

Main Methods:

• Directly expressing SULTs and NATs in target cells, including bacteria and mammalian cell lines.
• Developing procedures for enzyme expression in various cellular systems.
• Utilizing genetically manipulated mouse models for further investigation.

Main Results:

• Successful incorporation of SULT and NAT enzyme systems into in vitro test platforms.
• Demonstration of direct enzyme expression in bacteria and mammalian cells.
• Identification of genetically modified mouse models as a promising future approach.

Conclusions:

• Direct enzyme expression in target cells is the preferred method for enhancing in vitro mutagenicity assays.
• Incorporating human SULTs and NATs improves the assessment of mutagen and carcinogen activation.
• Genetically engineered models offer significant potential for future research in toxicology and carcinogenicity.