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Related Experiment Videos

Intraphagosomal chlorination dynamics and yields determined using unique fluorescent bacterial mimics

Q Jiang1, D A Griffin, D F Barofsky

  • 1Department of Biochemistry and Biophysics, Washington State University, Pullman 99164-4630, USA.

Chemical Research in Toxicology
|February 12, 1998
PubMed
Summary

Neutrophils use hypochlorous acid (HOCl) to kill bacteria within phagosomes. This study demonstrates HOCl production inside neutrophils, confirming its role in innate immunity and bacterial killing.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Neutrophils are key immune cells involved in pathogen killing.
  • The myeloperoxidase (MPO) system generates hypochlorous acid (HOCl), a potent oxidant.
  • The precise role and localization of HOCl in neutrophil microbicidal activity require further elucidation.

Purpose of the Study:

  • To develop fluorescently labeled microspheres for tracking phagocytosis and intracellular events.
  • To investigate the production and activity of HOCl within neutrophil phagosomes.
  • To provide evidence for HOCl's role in neutrophil-mediated bacterial killing.

Main Methods:

  • Covalent attachment of fluorescein to polyacrylamide microspheres via a cystamine linker.
  • Phagocytosis assays using neutrophils and serum-opsonized or unopsonized microspheres.

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  • Quantification of intracellular fluorescein modification (chlorination) using HPLC and mass spectrometry.
  • Measurement of methyl viologen-quenched external fluorescence and oxygen uptake.

    • Main Results:

    • Serum-opsonized microspheres were readily phagocytosed by neutrophils, while unopsonized beads were not.
    • Intracellular fluorescein was chlorinated by HOCl, with intraphagosomal chlorination being significantly higher than extracellular.
    • The extent of fluorescein chlorination indicated sufficient HOCl production to kill bacteria intracellularly.
    • HOCl production correlated with phagocytosis and stimulated oxygen uptake by neutrophils.

    Conclusions:

    • Fluorescein-labeled microspheres serve as effective reporters for phagocytosis and intracellular reactive oxygen species.
    • Neutrophils produce HOCl within phagosomes at concentrations sufficient for microbicidal activity.
    • These findings strongly support a primary role for HOCl in the killing of phagocytosed bacteria by neutrophils.