Flow cytometry and receptor occupancy in immune-oncology

Area of Science:

• Immunology
• Pharmacology
• Biotechnology

Background:

• Immunotherapies leverage antibodies to modulate immune cell functions by targeting specific receptors.
• Assessing the functional and biological impact of therapeutics on their targets is essential.
• High-parameter flow cytometry enables simultaneous evaluation of receptor expression and drug occupancy.

Purpose of the Study:

• To highlight the critical need for developing, optimizing, and validating Receptor Occupancy Assays (ROA).
• To emphasize the role of ROA in improving dose selection, pharmacology monitoring, and safety assessments.
• To discuss the application of ROA primarily within clinical settings.

Main Methods:

• Review of existing literature and methodologies for Receptor Occupancy Assays.
• Focus on the integration of ROA within high-parameter flow cytometry panels.
• Discussion on the challenges and considerations in assay design, optimization, and validation.

Main Results:

• Receptor Occupancy Assays provide critical data on drug effects on target receptors.
• ROA can simultaneously assess receptor expression and drug binding on specific immune cell subsets.
• Accurate ROA is vital for understanding functional effects and potential safety concerns.

Conclusions:

• Designing a robust ROA presents challenges and can lead to inaccurate pharmacology if not properly executed.
• Improvements in understanding epitopes, binding kinetics, and affinities enhance antibody drug targeting.
• Validated ROAs are key to precise receptor evaluation and effective immunotherapy development.