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Related Experiment Videos

Endotoxin-neutralizing protein protects against endotoxin-induced endothelial barrier dysfunction

D D Bannerman1, M J Fitzpatrick, D Y Anderson

  • 1Department of Pathology, VA Maryland Health Care System, University of Maryland School of Medicine, Baltimore 21201, USA.

Infection and Immunity
|April 7, 1998
PubMed
Summary

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Endotoxin-neutralizing protein blocks bacterial lipopolysaccharide (LPS) effects on endothelial cells. This peptide protects against LPS-induced barrier dysfunction and offers a potential therapy for gram-negative sepsis.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Immunology

Background:

  • Bacterial lipopolysaccharide (LPS) disrupts endothelial barrier function.
  • Lipid A is the key component of LPS responsible for this disruption.
  • Gram-negative sepsis involves vascular endothelial dysfunction due to LPS.

Purpose of the Study:

  • To investigate the efficacy of endotoxin-neutralizing protein (ENP) in preventing LPS-induced endothelial barrier dysfunction.
  • To determine if ENP can block LPS-mediated changes in endothelial cell signaling and structure.
  • To assess ENP's therapeutic potential for gram-negative sepsis.

Main Methods:

  • Exposure of bovine pulmonary artery endothelial cells to LPS and ENP.
  • Measurement of macromolecule flux (14C-albumin) across cell monolayers.

Related Experiment Videos

  • Analysis of protein tyrosine phosphorylation and actin organization.

    • Main Results:

    • LPS increased transendothelial albumin flux and induced tyrosine phosphorylation of paxillin and actin depolymerization.
    • Coadministration of ENP with LPS dose-dependently inhibited these LPS-induced effects.
    • ENP provided cross-protection against LPS from various gram-negative bacteria.

    Conclusions:

    • Lipid A is the bioactive component of LPS mediating endothelial barrier dysfunction.
    • Endotoxin-neutralizing protein effectively blocks LPS-induced endothelial cell responses.
    • ENP represents a promising therapeutic strategy for endotoxemia and gram-negative sepsis.