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Related Experiment Videos

Small increases in pH decrease uptake of Escherichia coli by human neutrophils in vitro.

E M Berger1, K Murphy, G A Shibao

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

Inflammation
|April 1, 1988
PubMed
Summary
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Elevated pH levels impair human neutrophils' ability to combat Escherichia coli but not Staphylococcus aureus. This suggests a direct impact on neutrophil function rather than bacterial changes.

Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Neutrophils are critical immune cells for combating bacterial infections.
  • Bacterial phagocytosis and killing by neutrophils are essential for innate immunity.
  • The impact of physiological pH changes on neutrophil function is not fully understood.

Purpose of the Study:

  • To investigate the effect of increased pH on the in vitro bactericidal activity of human neutrophils against common bacterial pathogens.
  • To elucidate the mechanisms underlying any observed changes in neutrophil function.

Main Methods:

  • Human neutrophils were incubated with Escherichia coli ATCC 29552 and Staphylococcus aureus 502A in serum at varying pH levels (7.4 to 7.8).
  • Bacterial uptake and killing by neutrophils were quantified.

Related Experiment Videos

  • Bacterial opsonization and growth were assessed.

    • Main Results:

    • Increased pH (7.4 to 7.8) significantly reduced neutrophil ingestion and killing of E. coli.
    • Neutrophil bactericidal activity against S. aureus remained unaffected by the pH increase.
    • The pH change did not alter E. coli opsonization or bacterial growth, indicating a direct effect on neutrophil function.

    Conclusions:

    • Physiological increases in pH can impair neutrophil-mediated killing of Gram-negative bacteria like E. coli.
    • Neutrophil function against Gram-positive bacteria, such as S. aureus, appears more robust to pH fluctuations.
    • These findings highlight a pH-dependent mechanism in neutrophil bactericidal activity, potentially impacting host defense in vivo.