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A rapid and simple microfluorometric phagocytosis assay
1Department of Microbiology, School of Medicine, Loma Linda University, CA 92350.
Journal of Immunological Methods
|June 4, 1993
Summary
A new microfluorometric assay quantifies phagocytosis using fluorescent Escherichia coli particles and trypan blue quenching. This method enables rapid, objective measurement of phagocytic activity in cell lines.
Area of Science:
- Immunology
- Cell Biology
- Biotechnology
Background:
- Phagocytosis is a critical cellular process for immune defense and cellular homeostasis.
- Accurate and efficient methods are needed to study phagocytosis, particularly for drug screening.
Purpose of the Study:
- To develop and validate a novel microfluorometric assay for quantifying phagocytosis.
- To establish a high-throughput method for screening substances that modulate phagocytic activity.
Main Methods:
- Utilized fluorescein-conjugated Escherichia coli K-12 particles for phagocytosis studies.
- Employed a murine macrophage cell line (J774) as a phagocyte model.
- Implemented a fluorescence quenching technique with trypan blue to differentiate intracellular from extracellular particles.
Main Results:
- Developed a rapid and objective microfluorometric assay for phagocytosis measurement.
- Demonstrated the assay's utility in a 96-well microtiter plate format for large-scale screening.
- Successfully quantified phagocytic activity by measuring intracellular fluorescence.
Conclusions:
- The developed microfluorometric method offers a sensitive and efficient tool for phagocytosis research.
- This assay facilitates the screening of biological and pharmacological agents affecting phagocytosis.
- The technique is suitable for high-throughput analysis in drug discovery and immunology research.