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Bactericidal/permeability-increasing protein has endotoxin-neutralizing activity.

M N Marra1, C G Wilde, J E Griffith

  • 1Invitron Corporation, Redwood City, CA 94063.

Journal of Immunology (Baltimore, Md. : 1950)
|January 15, 1990
PubMed
Summary
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Bactericidal/permeability-increasing protein (BPI) inhibits lipopolysaccharide (LPS) from activating neutrophils. This suggests BPI regulates neutrophil responses to LPS, beyond its direct antimicrobial effects.

Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Neutrophil granules contain proteins crucial for combating bacterial pathogens.
  • Bactericidal/permeability-increasing protein (BPI) is a key antimicrobial protein found in neutrophils that targets Gram-negative bacteria.

Purpose of the Study:

  • To investigate if BPI affects the biological activity of lipopolysaccharide (LPS) in vitro.
  • To determine if BPI modulates neutrophil activation induced by LPS.

Main Methods:

  • Utilized flow microfluorimetry to measure CR1 and CR3 surface expression on neutrophils as an indicator of activation.
  • Tested BPI's effect on neutrophil stimulation by various LPS chemotypes (rough and smooth).
  • Assessed BPI's specificity by testing its impact on neutrophil activation induced by formylated peptide and TNF, and in the Limulus amebocyte lysate assay.

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Main Results:

  • Purified BPI effectively inhibited CR1 and CR3 up-regulation on neutrophils stimulated by both rough and smooth LPS.
  • BPI's inhibitory activity was specific for LPS, as it did not affect neutrophil stimulation by formylated peptide or TNF.
  • BPI demonstrated specificity for LPS in the Limulus amebocyte lysate assay.

Conclusions:

  • BPI plays a role in regulating neutrophil responses to LPS, independent of its direct microbicidal activity.
  • BPI may act as a modulator of the inflammatory response initiated by LPS.
  • The findings suggest a broader role for BPI in host defense against Gram-negative bacterial infections.