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Hypertonic immunomodulation is reversible and accompanied by changes in CD11b expression.

S B Rizoli1, A Kapus, J Parodo

  • 1Department of Surgery, Toronto Hospital and University of Toronto, Toronto, Ontario, Canada.

The Journal of Surgical Research
|May 18, 1999
PubMed
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Repeated hypertonic saline (HTS) infusions can restore the protective effect against lung injury caused by hemorrhagic shock and lipopolysaccharide (LPS), which is lost after 18 hours. This suggests a need for repeated HTS administration to maintain benefits.

Area of Science:

  • Immunology
  • Resuscitation Medicine
  • Critical Care

Background:

  • Hypertonic saline (HTS) resuscitation reduces neutrophil sequestration and lung injury in a two-hit model (hemorrhagic shock + LPS).
  • This effect is partly due to suppressed CD11b expression, a surface adhesion molecule on neutrophils.

Purpose of the Study:

  • To investigate the duration of HTS's protective effect after a single dose.
  • To evaluate the efficacy of repeated HTS infusions in maintaining protection.

Main Methods:

  • Utilized a two-hit rodent model of hemorrhagic shock and LPS.
  • Measured neutrophil lung sequestration via bronchoalveolar fluid cell counts.
  • Assessed CD11b expression using flow cytometry and in vitro human neutrophil studies.

Related Experiment Videos

Main Results:

  • The protective effect of HTS was lost by 18 hours post-resuscitation.
  • A second HTS infusion prevented LPS-induced increases in neutrophil sequestration and CD11b expression.
  • In vitro studies indicated that 4-hour hypertonic exposure, but not 2-hour, prevented CD11b upregulation.

Conclusions:

  • HTS resuscitation transiently lessens lung neutrophil sequestration and CD11b expression induced by LPS.
  • Repeated HTS infusions are necessary to maintain the protective effect.
  • The transient and reversible nature of HTS's effect allows for rapid modulation of neutrophil function, preventing tissue damage without prolonged immunosuppression.