Development and Validation of a Multiplex Flow Cytometry-Based PBMC Assay for Immunomodulator Screening

Area of Science:

• Immunology
• Pharmacology
• Biotechnology

Background:

• Advancing immunotherapy requires identifying novel immune-stimulating or suppressing compounds.
• Traditional screening methods lack throughput, physiological relevance, and resolution for subtle immunomodulatory effects.

Purpose of the Study:

• To develop and validate a robust multiplexed flow cytometry assay for efficient and precise identification of immunomodulatory compounds.
• To overcome limitations of conventional screening approaches in immunology.

Main Methods:

• Utilized human peripheral blood mononuclear cells (PBMCs) under defined stimulation conditions.
• Simultaneously monitored T-cell proliferation (CFSE), activation (CD25, CD71), and B-cell costimulatory marker expression (CD86).
• Incorporated statistical validation using the Z-factor for reliability and reproducibility.

Main Results:

• The assay demonstrated high efficiency and precision in identifying immunomodulatory compounds.
• A pilot screen of 295 compounds successfully identified known immunomodulators with distinct functional profiles.
• The assay provides an in-depth assessment of immune modulation in heterogeneous cell populations.

Conclusions:

• This multiplex functional screening assay offers a physiologically relevant and high-resolution approach for drug discovery in immunotherapy.
• It effectively bridges mechanistic immunology and drug development by enabling systematic identification and characterization of immunotherapeutic candidates.
• The assay provides valuable insights into the complex dynamics of immune regulation.