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Platelet activation In mice and human Helicobacter pylori infection

J I Elizalde1, J Gómez, J Panés

  • 1Department of Gastroenterology, Hospital Clínic i Provincial, University of Barcelona, 08036 Barcelona, Spain.

The Journal of Clinical Investigation
|September 1, 1997
PubMed

Insights

Helicobacter pylori (HP) infection causes platelet activation and aggregation, leading to inflammatory cell recruitment in gastric microvessels. This platelet activity contributes to microvascular dysfunction during HP infections.

Area of Science:

  • Gastroenterology
  • Immunology
  • Microcirculation Research

Background:

  • Helicobacter pylori (HP) infection is a significant cause of gastritis and peptic ulcers.
  • Previous studies showed HP extracts induce leukocyte adhesion in mesenteric venules.
  • The impact of HP infection on gastric microvessels remained unclear.

Purpose of the Study:

  • To investigate the effects of HP infection on gastric microcirculation.
  • To determine the role of inflammatory cell interactions and platelet activation in HP-associated gastric pathology.

Main Methods:

  • Intravital videomicroscopy in HP-inoculated mice to study gastric microcirculation.
  • Quantification of platelet aggregates in portal blood.
  • Measurement of endothelial and platelet P-selectin expression.
  • Assessment of platelet-aggregate ratio and platelet activation markers in HP-infected patients.

Main Results:

  • HP infection significantly increased leukocyte rolling and the formation of platelet-leukocyte aggregates in gastric venules.
  • HP-induced rolling and platelet aggregation were blocked by antibodies against L- and P-selectin.
  • Platelet P-selectin expression was enhanced in HP-infected mice and patients, indicating platelet activation.
  • Circulating platelet aggregates and activated platelets were observed in HP-infected patients.

Conclusions:

  • Platelet activation and aggregation are key mechanisms in HP infection.
  • These platelet changes contribute to microvascular dysfunction and inflammatory cell recruitment in the gastric microcirculation.
  • Targeting platelet activation may offer therapeutic strategies for HP-related gastrointestinal issues.

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