Basis of a high-throughput method for nuclear receptor ligands

Area of Science:

• Endocrinology
• Molecular Biology
• Toxicology

Background:

• Man-made chemicals can disrupt hormone receptor function, posing public health risks.
• Nuclear receptors are transcriptional factors regulated by small, fat-soluble molecules.
• Xenobiotics often target nuclear receptors due to their ligand-binding properties.

Purpose of the Study:

• To develop a novel, rapid, and sensitive in vitro screening method for chemicals that interact with nuclear receptors.
• To create a high-throughput screening assay applicable to various nuclear receptors.

Main Methods:

• Developed the CoA-BAP system utilizing the interaction between nuclear receptors and coactivators.
• Expressed human TIF2 (coactivator) and nuclear receptor ligand-binding domains (LBDs) as fusion proteins in E. coli.
• Detected protein-protein interactions via alkaline phosphatase activity on a GSH-coupled microplate after chemical incubation.

Main Results:

• The CoA-BAP system demonstrated high sensitivity and ease of use for ligand screening.
• The method is suitable for high-throughput screening on microplates.
• Successfully validated the system for seven nuclear receptors: ERα/β, TRα, RARα/γ, RXRα, and VDR.

Conclusions:

• The CoA-BAP system is a versatile and effective tool for screening nuclear receptor-ligand interactions.
• This method facilitates the assessment of potential endocrine-disrupting chemicals.
• The system supports public health efforts by enabling rapid identification of chemicals affecting hormone receptor pathways.