Selective Photoaffinity Probe for Monitoring Farnesoid X Receptor Expression in Cultured Cells

Area of Science:

• Molecular Biology
• Biochemistry
• Cellular Imaging

Background:

• Farnesoid X receptor (FXR) is a nuclear receptor crucial for regulating gene expression in the liver and intestine.
• FXR activity is influenced by diet and circadian rhythms, but real-time monitoring of its homeostasis is currently lacking.
• The absence of real-time monitoring hinders the investigation of FXR's role in physiological and pathological conditions.

Purpose of the Study:

• To develop a novel method for real-time monitoring of FXR homeostasis.
• To enable further investigation into FXR function under various biological conditions.

Main Methods:

• Modification of classic FXR agonists by incorporating a photo-cross-linking diazirine group and an alkynyl click reaction group.
• Utilizing biorthogonal reactions to link a fluorophore to the modified FXR ligands.
• Application of the fluorescently tagged ligands for monitoring FXR expression within cells.

Main Results:

• Successfully synthesized modified FXR agonists capable of targeting FXR.
• Demonstrated the feasibility of linking fluorophores to these ligands via click chemistry.
• Established a method for visualizing and monitoring FXR expression in cells.

Conclusions:

• The developed technique allows for real-time monitoring of FXR expression.
• This advancement provides a valuable tool for studying FXR's physiological and pathological roles.
• The methodology opens new avenues for FXR-targeted drug discovery and diagnostics.