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Related Experiment Videos

Thiourea and dimethylthiourea decrease human neutrophil bactericidal function in vitro.

J H Jackson1, E M Berger, J E Repine

  • 1Department of Medicine, Webb-Waring Lung Institute, University of Colorado Medical Center, Denver.

Inflammation
|October 1, 1988
PubMed
Summary
This summary is machine-generated.

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Thiourea (TU) and dimethylthiourea (DMTU) reduce the killing of Staphylococcus aureus by human neutrophils. These compounds inhibit oxygen metabolite-dependent mechanisms, decreasing hydrogen peroxide and hydroxyl radical concentrations.

Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Human neutrophils are critical in combating bacterial infections.
  • Neutrophils utilize reactive oxygen species (ROS) for bacterial killing.
  • Understanding inhibitors of neutrophil antimicrobial mechanisms is important.

Purpose of the Study:

  • To investigate the effect of thiourea (TU) and dimethylthiourea (DMTU) on neutrophil-mediated bacterial killing.
  • To determine the impact of TU and DMTU on reactive oxygen species (ROS) and other antimicrobial factors.

Main Methods:

  • In vitro experiments using human neutrophils and Staphylococcus aureus.
  • Measurement of bacterial killing, hydrogen peroxide (H2O2), hydroxyl radical (.OH), superoxide anion (O2-.), and lysozyme concentrations.

Related Experiment Videos

  • Controlled experiments with beta-D-glucose/glucose oxidase, gamma irradiation, and hypochlorous acid (HOCl).

    • Main Results:

    • TU and DMTU decreased Staphylococcus aureus killing by neutrophils.
    • These compounds reduced concentrations of H2O2 and .OH in neutrophil mixtures.
    • TU and DMTU also decreased H2O2, .OH, and HOCl in cell-free systems.

    Conclusions:

    • Thiourea and dimethylthiourea inhibit neutrophil-mediated bacterial killing.
    • The inhibitory effect is linked to the suppression of oxygen metabolite-dependent bactericidal mechanisms.
    • TU and DMTU interfere with key ROS involved in antimicrobial activity.