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Real-time bacterial detection with an intracellular ROS sensing platform.

J M Hicks1, R Halkerston2, N Silman2

  • 1Regenerative Medicine and Cellular Therapies, University of Nottingham, Nottingham, UK.

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|July 13, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel electrochemical biosensor for detecting reactive oxygen species. This new technology rapidly and accurately measures intracellular hydrogen peroxide in response to bacterial infections, offering a significant advancement in diagnostics.

Keywords:
BacteriaBiosensorHydrogen peroxideMacrophageROSSWCNT

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Area of Science:

  • Biomedical Engineering
  • Immunology
  • Analytical Chemistry

Background:

  • Reactive oxygen species (ROS) are crucial in biological processes and implicated in various diseases.
  • Existing technologies struggle with accurate detection and identification of specific ROS.
  • Understanding ROS dynamics during bacterial infection is vital for immune response studies.

Purpose of the Study:

  • To develop a novel electrochemical biosensor for sensitive and rapid detection of intracellular hydrogen peroxide (H2O2).
  • To investigate the real-time H2O2 production by macrophage cells upon bacterial challenge.
  • To differentiate immune responses to various bacterial serotypes using H2O2 as an indicator.

Main Methods:

  • Fabrication of an electrochemical biosensor using single-walled carbon nanotubes on indium tin oxide, functionalized with an osmium-based compound.
  • Integration of the biosensor into RAW 264.7 macrophage cells for intracellular measurements.
  • Stimulation of immune response using Gram-negative bacteria and measurement of H2O2 via lipopolysaccharide-Toll-like Receptor 4 interaction.
  • Validation of sensor specificity using n-acetylcysteine and sodium pyruvate controls.

Main Results:

  • The biosensor demonstrated a low limit of detection for H2O2 at 368 nM.
  • Intracellular H2O2 increase was detected within 3 seconds of bacterial interaction with macrophages.
  • Distinct H2O2 production patterns were observed for different Gram-negative bacterial serotypes.
  • The sensor enabled unprecedented temporal detection of H2O2 during bacterial threat response.

Conclusions:

  • The developed electrochemical biosensor offers sensitive, rapid, and specific detection of intracellular H2O2.
  • This technology provides real-time insights into the dynamic innate immune response to bacterial infections.
  • The findings highlight the potential for advanced diagnostics and understanding of host-pathogen interactions.