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Related Experiment Videos

Hypertonic saline infusion: can it regulate human neutrophil function?

N Angle1, R Cabello-Passini, D B Hoyt

  • 1Department of Surgery, University of California San Diego, California 92103-8236, USA.

Shock (Augusta, Ga.)
|November 25, 2000
PubMed
Summary
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Hypertonic saline (HS) infusion in healthy volunteers suppressed neutrophil CD11b expression, potentially reducing organ injury. This effect may be more significant in trauma patients, mitigating neutrophil-mediated tissue damage.

Area of Science:

  • Physiology
  • Immunology
  • Emergency Medicine

Background:

  • Hemorrhagic shock can lead to neutrophil-mediated organ injury.
  • Hypertonic saline (HS) is known to block neutrophil activation and reduce organ injury in animal models.
  • The effect of HS on human neutrophil function requires further investigation.

Purpose of the Study:

  • To investigate the effects of HS infusion on neutrophil function in healthy human volunteers.
  • To assess changes in neutrophil adhesion molecule expression (CD11b and L-selectin) and phagocytosis.
  • To determine if HS administration impacts neutrophil activation markers.

Main Methods:

  • Healthy volunteers received either 7.5% HS or normal saline (NS) infusion.
  • Blood samples were collected pre- and post-infusion for neutrophil analysis.

Related Experiment Videos

  • Neutrophil phagocytosis, CD11b, and L-selectin expression were measured using flow cytometry after stimulation with fMLP.

    • Main Results:

    • HS infusion transiently increased plasma sodium levels but had minimal effect on mean arterial pressure.
    • Neither HS nor NS significantly affected neutrophil phagocytosis.
    • HS infusion led to a significant decrease in CD11b expression on both unstimulated and fMLP-stimulated neutrophils.
    • L-selectin expression on unstimulated neutrophils increased post-HS infusion.

    Conclusions:

    • HS infusion suppresses CD11b expression in human neutrophils.
    • This suppression of neutrophil adhesion molecules may reduce neutrophil-endothelial cell interactions.
    • The findings suggest a potential therapeutic benefit of HS in mitigating neutrophil-mediated tissue damage, particularly in trauma patients.