High-Sensitivity Assessment of Phagocytosis by Persistent Association-Based Normalization

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Phagocytosis is a critical cellular process in immunity and development.
• Current methods for quantifying phagocytosis lack cross-laboratory reproducibility and robustness.
• Accurate measurement is essential for understanding phagocyte function and disease states.

Purpose of the Study:

• To develop a novel, reproducible, and sensitive method for quantifying phagocytosis.
• To introduce persistent prey-phagocyte association as a key parameter for normalization.
• To establish a straightforward analytical method for dose-response analysis in phagocytosis assays.

Main Methods:

• Developed persistent association-based normalization (PAN) using the multiplicity of prey (MOP) ratio.
• Determined MOP50 (MOP to elicit 50% persistent association) for normalization.
• Compared PAN with standard phagocytosis assays using THP-1 cells, various prey, and opsonization conditions.

Main Results:

• PAN demonstrated superior robustness, sensitivity, and reproducibility compared to standard methods.
• The method effectively normalizes for experimental variations in phagocytosis assays.
• Persistent association-based normalization allows for sensitive analysis of association and internalization.

Conclusions:

• Persistent association-based normalization offers a significant advancement in quantifying phagocytosis.
• This easily integrated method enhances the reliability and reproducibility of phagocytosis research.
• The approach facilitates accurate dose-response analysis and cross-laboratory comparisons.