Tractable Mammalian Cell Infections with Protozoan-primed Bacteria

Overview

This technique provides a method to harvest, normalize, and quantify intracellular growth of bacterial pathogens that are pre-cultivated in natural protozoan host cells prior to infections of mammalian cells. The method allows for the use of various host cells for the priming stage and target cell types.

Key Study Components

Area of Science

• Microbiology
• Cell Biology
• Infectious Diseases

Background

• Legionella mala can be used to study bacterial infections.
• Protozoan host cells can enhance bacterial pathogenicity.
• Fluorescent tagging aids in quantifying bacterial growth.
• Understanding host-pathogen interactions is crucial for developing treatments.

Purpose of Study

• To harvest and quantify bacteria from protozoan hosts.
• To assess the pathogenic advantage of bacteria cultivated in natural hosts.
• To prepare bacteria for subsequent infection of mammalian cells.

Methods Used

• Infection of protozoan cells with GFP-expressing Legionella mala.
• Harvesting bacteria through selective lysis.
• Calculating bacterial concentration using fluorescence emission.
• Infecting mammalian cell monolayers with primed bacteria.

Main Results

• Bacteria cultivated in protozoan cells showed increased pathogenicity.
• Fluorescence microscopy and flow cytometry were used for quantification.
• Colony forming units were recovered from lysates for analysis.
• Data supports the advantage of natural host cultivation over artificial media.

Conclusions

• Protozoan hosts enhance the growth and pathogenicity of bacteria.
• This method can be adapted for various host and target cell types.
• Understanding these interactions can inform future research on bacterial infections.

Frequently Asked Questions