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A one-plate assay for macrophage bactericidal activity.

Journal of Immunological Methods

|September 3, 1985

Summary

Human monocytes activated with interferon-gamma (IFN gamma) demonstrated improved killing of Listeria Monocytogenes and Staphylococcus aureus. This enhanced bactericidal activity was efficiently measured using a novel MTT microassay.

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Area of Science:

Immunology
Microbiology

Background:

Human peripheral blood monocytes are key immune cells involved in pathogen clearance.
Interferon-gamma (IFN gamma) is a crucial cytokine for activating macrophages and enhancing their antimicrobial functions.

Purpose of the Study:

To investigate the effect of IFN gamma activation on the bactericidal capacity of human monocytes against Listeria Monocytogenes and Staphylococcus aureus.
To establish and validate a rapid microassay for quantifying monocyte-mediated bacterial killing.

Main Methods:

Human peripheral blood monocytes were purified using counterflow centrifugal elutriation (CCE).
Monocytes were activated with IFN gamma.
Bactericidal activity was assessed using a colorimetric MTT microassay, measuring bacterial reduction of the dye.
Results were validated by comparison with traditional bacterial colony counts.

Main Results:

IFN gamma-activated monocytes exhibited significantly enhanced killing of both Listeria Monocytogenes and Staphylococcus aureus compared to unactivated monocytes.
The MTT microassay provided a rapid and accurate quantification of bacterial viability, correlating well with standard plate counting methods.
The entire assay procedure, from cell culture to bacterial quantification, was streamlined within a single microtiter plate.

Conclusions:

Interferon-gamma effectively enhances the bactericidal activity of human monocytes against common bacterial pathogens.
The MTT-based microassay is a sensitive, efficient, and reliable method for evaluating monocyte-mediated antimicrobial function.

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