Fluorescence anisotropy imaging in drug discovery

Area of Science:

• Pharmacology and Biophysics
• Molecular Imaging and Microscopy

Background:

• Non-invasive drug-target engagement measurement is crucial for understanding small molecule drug pharmacology.
• Fluorescence polarization/anisotropy assays are standard for in vitro screening but challenging in vivo.
• Recent advances in fluorescence anisotropy microscopy have enabled in vivo applications.

Purpose of the Study:

• To review the background, current advances, and future perspectives of intravital fluorescence anisotropy measurements.
• To highlight the application of this technique for deriving pharmacokinetic and pharmacodynamic data.
• To discuss its utility in single cells and whole organs using mouse models.

Main Methods:

• High-resolution fluorescence anisotropy microscopy for in vivo measurements.
• Kinetic measurements of intracellular drug distribution and target engagement.
• Application in commonly used mouse models for intravital studies.

Main Results:

• Demonstration of feasibility for in vivo, non-invasive drug-target engagement assessment.
• Capability to perform kinetic measurements at the cellular and organ levels.
• Derivation of pharmacokinetic and pharmacodynamic parameters in a living system.

Conclusions:

• Intravital fluorescence anisotropy microscopy is a powerful tool for molecular pharmacology.
• It bridges the gap between in vitro assays and in vivo drug behavior.
• Future perspectives include broader applications in drug discovery and development.