Why does null hypothesis testing matter for ADCP quantification?

Null hypothesis testing ensures that observed differences in ADCP activity between antibody candidates or conditions are statistically significant, supporting confident target validation and portfolio triage.

How does independent variable isolation fit the ADCP assay workflow?

Isolating variables such as antibody specificity or leukocyte subset enables precise attribution of phagocytic activity, clarifying mechanistic contributions in the discovery pipeline.

What do quantitative fluorescence measurements enable in ADCP analysis?

Quantitative fluorescence intensity and population percentages provide objective metrics for comparing phagocytic activity, supporting data-driven candidate selection and assay reproducibility.

Why are replication requirements critical for cross-functional ADCP studies?

Replication ensures that ADCP results are robust and reproducible across teams and experiments, facilitating reliable cross-functional collaboration and decision-making.

Which statistical analysis capabilities are required before ADCP implementation?

Robust statistical analysis, including gating strategies and calculation of median fluorescence intensity, is essential to validate assay outputs and support confident advancement decisions.

An In Vitro Assay to Measure Antibody-Dependent Cellular Phagocytosis by Phagocytes

JoVE Encyclopedia of Experiments

Immunology

0 views • 4:03 min • July 8th, 2025

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Take fluorescently labeled microspheres conjugated to an antigen of interest. The immobilized antigens are bound to antigen-specific antibodies.

Add leukocytes, including non-phagocytic lymphocytes, phagocytic granulocytes, and monocytes. Incubate the mixture under physiological conditions.

The Fc region of the immobilized antibody binds to the Fc receptor on the phagocyte, triggering antibody-dependent cellular phagocytosis, or ADCP.

Centrifuge to pellet the cells and discard the supernatant containing non-internalized microspheres.

Add a viability stain that enters dead cells, fluorescently labeling them.

Centrifuge to pellet the cells and remove the supernatant.

Add fluorescently labeled antibodies that bind to leukocytes.

Centrifuge to discard the supernatant and fix the cells.

Using flow cytometry, first, eliminate the dead cells that are positive for viability stain.

Then, select the viable leukocytes and discriminate between granulocytes, monocytes, and lymphocytes based on their granularity and scattering properties.

Measure the fluorescence intensity of the microsphere-positive phagocytic cells to quantify their ADCP activity.

For an ADCP assay, quickly invert the prepared ADCP plate to decant the supernatant after the final centrifugation, and add 5 x 10⁴ freshly isolated breastmilk cells in 200 microliters of PBS plus BSA for a 2-hour incubation at 37 degrees Celsius.

At the end of the incubation, centrifuge the cells, and wash the pellets two times in 200 microliters of fresh PBS as demonstrated. After the last wash, stain the cells with 0.5 micrograms per milliliter of fixable viability stain, 450 per well, and 50 microliters of PBS for 30 minutes at room temperature, protected from light.

At the end of the incubation, pellet the cells for two washes in fresh PBS as demonstrated and stain the cells for the leukocyte markers of interest for 30 minutes at room temperature, protected from light. At the end of the incubation, collect the cells by centrifugation, and wash the cells two times in 200 microliters of 1% BSA plus PBS per wash.

After the last wash, fix the pellets in 200 microliters of 0.5% formaldehyde per well for 30 minutes at room temperature, protected from light. For flow cytometric analysis of the cell samples, set a flow cytometer equipped with a high throughput plate reader to withdraw 175 microliters of sample and to collect 5,000 cells per well.

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Last updated: 15 August 2026

An In Vitro Assay to Measure Antibody-Dependent Cellular Phagocytosis by Phagocytes

Overview

Key Study Components

Area of Science

Background

Purpose of Study

Methods Used

Main Results

Conclusions

Frequently Asked Questions

Executive Industry Relevance

Strategic Applications in Biopharma R&D

Early Discovery & Target Validation

Screening & Assay Development

Translational & Preclinical Research

Pipeline & Workflow Integration

Operational & Enterprise Impact

Implementation Considerations

Biopharma FAQs

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