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Related Experiment Videos

Oxidative stress during platelet-activating factor-induced microvascular dysfunction

I Kurose1, L W Argenbright, R Wolf

  • 1Department of Physiology, Louisiana State University Medical Center, Shreveport 71130-3932, USA.

Microcirculation (New York, N.Y. : 1994)
|December 1, 1996
PubMed
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Hydrogen peroxide (H2O2) contributes to inflammation by increasing leukocyte adhesion and microvascular permeability. Activated leukocytes are the primary source of these damaging oxidants in mesenteric tissue following platelet-activating factor exposure.

Area of Science:

  • Inflammation Research
  • Microvascular Physiology
  • Oxidative Stress Biology

Background:

  • Platelet-activating factor (PAF) induces leukocyte-endothelial cell adhesion and microvascular leakage.
  • The role of hydrogen peroxide (H2O2) in these PAF-induced responses requires further elucidation.

Purpose of the Study:

  • To investigate the contribution of H2O2 to leukocyte-endothelial cell adhesion.
  • To assess H2O2's role in increased microvascular permeability induced by PAF in rat mesenteric venules.

Main Methods:

  • Monitoring oxidant production using dihydrorhodamine 123 (DHR) in mesenteric tissue.
  • Assessing albumin extravasation and leukocyte adherence/emigration post-PAF exposure.
  • Utilizing catalase, dimethylthiourea, and specific monoclonal antibodies (anti-CD11b/CD18, anti-ICAM-1) to modulate responses.

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Main Results:

  • PAF exposure rapidly increased albumin extravasation and DHR oxidation.
  • Leukocyte adherence and emigration increased following PAF-induced DHR oxidation.
  • Catalase, dimethylthiourea, and antibody treatments attenuated PAF-induced oxidative stress, albumin leakage, and leukocyte adhesion.

Conclusions:

  • Oxidants generated in PAF-exposed mesenteric tissue primarily result from activated leukocyte accumulation.
  • H2O2 plays a significant role in PAF-induced microvascular inflammation.
  • Targeting leukocyte-derived oxidants may offer therapeutic strategies for inflammatory conditions.