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    This study presents a high-throughput flow cytometry assay using Annexin V and propidium iodide to measure early apoptosis. This method efficiently characterizes therapeutic antibody candidates by assessing their cell-killing capabilities.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Biotechnology

    Background:

    • Therapeutic antibodies can eliminate target cells through various mechanisms, including apoptosis.
    • Characterizing these cell-killing effects is crucial for evaluating lead antibody candidates.
    • High-throughput assays are needed for efficient, multidose candidate evaluation.

    Purpose of the Study:

    • To describe a simple, multiplexed flow cytometry assay for measuring early apoptosis.
    • To enable rapid characterization of therapeutic antibody candidates.
    • To assess antibody-mediated cell killing.

    Main Methods:

    • Utilized Annexin V and propidium iodide for a flow cytometry assay.
    • Exploited the calcium-dependent binding of Annexin V to phosphatidyl serine (PS) on apoptotic cell surfaces.
    • Incorporated EDTA to confirm Annexin V staining specificity.

    Main Results:

    • The assay effectively measures an early marker of apoptosis.
    • Annexin V binding specificity was confirmed through calcium dependence and EDTA inhibition.
    • Propidium iodide allowed differentiation of later apoptotic stages and cell death.

    Conclusions:

    • This multiplexed flow assay provides a rapid and efficient method for characterizing therapeutic antibody-mediated cell killing.
    • The assay is suitable for high-throughput screening of antibody candidates.
    • The described method aids in the development of effective therapeutic antibodies.