Role of receptor occupancy assays by flow cytometry in drug development
Jennifer J Stewart1, Cherie L Green2, Nicholas Jones3
1Flow Contract Site Laboratory, LLC, Bothell, Washington, 98012.
Abstract:
The measurement of the binding of a biotherapeutic to its cellular target, receptor occupancy (RO), is increasingly important in development of biologically-based therapeutic agents. Receptor occupancy (RO) assays by flow cytometry describe the qualitative and/or quantitative assessment of the binding of a therapeutic agent to its cell surface target. Such RO assays can be as simple as measuring the number of cell surface receptors bound by an antireceptor therapeutic agent or can be designed to address more complicated scenarios such as internalization or shedding events once a receptor engages the administered therapeutic agent. Data generated from RO assays can also be used to model whether given doses of an experimental therapeutic agent and their administration schedules lead to predicted levels of receptor occupancy and whether the receptor is modulated (up or down) on cells engaged by the therapeutic agent. There are a variety of approaches that can be used when undertaking RO assays and with the ability to measure distinct subsets in heterogeneous populations, flow cytometry is ideally suited to RO measurements. This article highlights the importance of RO assays on the flow cytometric platform in the development of biotherapeutic agents.
Insights
Receptor occupancy (RO) assays using flow cytometry are crucial for biotherapeutic development. These assays measure drug binding to cellular targets, aiding in dose optimization and understanding drug effects.
Area of Science:
- Biotechnology
- Pharmacology
- Immunology
Background:
- Biotherapeutic drug development requires precise measurement of drug-target interactions.
- Receptor occupancy (RO) quantifies the binding of therapeutics to cellular targets, a critical parameter in drug efficacy.
- Flow cytometry offers a versatile platform for assessing these interactions.
Purpose of the Study:
- To highlight the significance of receptor occupancy (RO) assays in biotherapeutic development.
- To emphasize the utility of flow cytometry for conducting RO assays.
- To illustrate how RO data informs therapeutic agent dosing and scheduling.
Main Methods:
- Utilizing flow cytometry for qualitative and quantitative assessment of therapeutic agent binding to cell surface targets.
- Designing assays to evaluate simple binding, internalization, and shedding events.
- Analyzing heterogeneous cell populations to measure distinct subsets.
Main Results:
- Flow cytometry enables detailed analysis of receptor occupancy.
- RO assays provide data for modeling therapeutic dosing and administration schedules.
- Measurements can reveal receptor modulation (up/down-regulation) upon therapeutic engagement.
Conclusions:
- Receptor occupancy assays are indispensable in biotherapeutic development.
- Flow cytometry is an ideal technology for robust RO measurements.
- RO data is vital for optimizing therapeutic strategies and predicting clinical outcomes.
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