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Updated: May 3, 2026

Study of Phagolysosome Biogenesis in Live Macrophages

Study of Phagolysosome Biogenesis in Live Macrophages

Published on: March 10, 2014

Dynamic quantitative assays of phagosomal function.

Maria Podinovskaia¹, Brian C VanderVen¹, Robin M Yates²

¹Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York.

Current Protocols in Immunology

|February 11, 2014

Summary

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This summary is machine-generated.

Researchers developed real-time assays to quantify macrophage phagosomal function. These methods measure phagosome-lysosome fusion, superoxide burst, and proteolysis, aiding the study of immune responses and tissue repair.

Area of Science:

Immunology
Cell Biology
Biochemistry

Background:

Macrophages are crucial immune cells, with key effector functions occurring within their phagocytic compartment.
Phagosomal activities include tissue debris degradation for homeostasis and superoxide burst generation for microbicidal responses.
Quantifying these phagosomal functions is essential for understanding macrophage roles in health and disease.

Purpose of the Study:

To develop and present real-time quantitative assays for assessing critical macrophage phagosomal functions.
To demonstrate the utility of various detection methods, including fluorescence-based techniques, for phagosomal activity measurements.
To highlight the flexibility and range of parameters measurable in phagosomal assays.

Main Methods:

Keywords:

macrophage phagocytosis phagosome phagosome maturation

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Study of Phagolysosome Biogenesis in Live Macrophages

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Development of a fluorescence resonance energy transfer (FRET) assay for quantifying phagosome-lysosome fusion using spectrofluorometry.

Implementation of a fluorogenic assay for measuring the superoxide burst via flow cytometry.

Utilization of a fluorogenic assay for assessing bulk proteolysis observed through confocal microscopy.

Main Results:

Established real-time readouts for rigorous quantification of phagosomal activities.
Demonstrated successful application of spectrofluorometry, flow cytometry, and confocal microscopy for assay quantitation.
Showcased the versatility of different instrumental approaches for analyzing phagosomal functions.

Conclusions:

The developed assays provide robust tools for quantifying macrophage phagosomal functions.
These methods enable detailed analysis of processes like fusion, oxidative burst, and proteolysis.
The flexibility of the assays allows for adaptation to various research questions in immunology and cell biology.