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Updated: Nov 6, 2025
Real-Time Quantification of Reactive Oxygen Species in Neutrophils Infected with Meningitic Escherichia Coli
Published on: April 20, 2021
Real-Time Quantification of Reactive Oxygen Species in Neutrophils Infected with Meningitic Escherichia Coli
Xue-Wei Zhang1, Ming-Xin An1, Wei-Dong Zhao2
1Department of Developmental Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University.
Abstract:
Escherichia coli (E. coli) is the most common Gram-negative bacteria causing neonatal meningitis. The occurrence of bacteremia and bacterial penetration through the blood-brain barrier are indispensable steps for the development of E. coli meningitis. Reactive oxygen species (ROS) represent the major bactericidal mechanisms of neutrophils to destroy the invaded pathogens. In this protocol, the time-dependent intracellular ROS production in neutrophils infected with meningitic E. coli was quantified using fluorescent ROS probes detected by a real-time fluorescence microplate reader. This method may also be applied to the assessment of ROS production in mammalian cells during pathogen-host interactions.
Insights
This study quantifies reactive oxygen species (ROS) in neutrophils fighting meningitis-causing Escherichia coli (E. coli). The findings offer a new method to study bacterial infections and host immune responses.
Area of Science:
- Microbiology
- Immunology
- Cell Biology
Background:
- Escherichia coli (E. coli) is a primary cause of Gram-negative bacterial meningitis in newborns.
- Bacteremia and crossing the blood-brain barrier are critical for E. coli meningitis development.
- Neutrophils utilize reactive oxygen species (ROS) as a key defense against invading bacteria.
Purpose of the Study:
- To develop and present a protocol for quantifying intracellular ROS production in neutrophils during infection with meningitic E. coli.
- To establish a method for assessing host-pathogen interactions in real-time.
Main Methods:
- Infection of neutrophils with a meningitic strain of E. coli.
- Quantification of intracellular ROS production using fluorescent probes.
- Real-time detection of ROS levels with a fluorescence microplate reader.
Main Results:
- Demonstrated a method for measuring time-dependent intracellular ROS production in neutrophils infected with E. coli.
- Successfully quantified ROS generation in response to bacterial challenge.
Conclusions:
- The developed protocol provides a reliable method for assessing neutrophil ROS production against E. coli.
- This technique can be adapted to study ROS dynamics in various mammalian cell-pathogen interactions.
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