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Decrease in platelet reduced glutathione increases lipoxygenase activity and decreases vitamin E.

C Calzada1, E Véricel, M Lagarde

  • 1Institut National de la Santé et de la Recherche Médicale U.205, Chimie Biologique INSA, Villeurbanne, France.

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|September 1, 1991
PubMed
Summary
This summary is machine-generated.

Diamide treatment, a thiol-oxidizing agent, reduced platelet antioxidant status, increasing lipoxygenase activity and lipid peroxidation markers. This suggests a link between reduced glutathione and enhanced arachidonic acid oxygenation in platelets.

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Area of Science:

  • Biochemistry
  • Hematology
  • Oxidative Stress Research

Background:

  • Platelets play a crucial role in hemostasis and thrombosis.
  • Oxidative stress can significantly impact platelet function and contribute to cardiovascular diseases.
  • Understanding the interplay between platelet redox status and arachidonic acid metabolism is vital.

Purpose of the Study:

  • To investigate the effects of a thiol-oxidizing agent, diamide, on normal human blood platelets.
  • To examine the impact of diamide on arachidonic acid (AA) metabolism and antioxidant status in platelets.
  • To determine the relationship between altered antioxidant levels and specific AA oxygenation pathways.

Main Methods:

  • Normal human blood platelets were treated with diamide, a thiol-oxidizing agent.
  • High-performance liquid chromatography (HPLC) was used to quantify oxygenated AA metabolites, malondialdehyde (MDA), and tocopherols.
  • Reduced glutathione (GSH) content and peroxidase activity were measured.

Main Results:

  • Diamide treatment led to a partial decrease in reduced glutathione (GSH) content and peroxidase activity.
  • Formation of 12-hydroxy-eicosatetraenoic acid (12-HETE), an AA lipoxygenase product, increased significantly.
  • Malondialdehyde (MDA) formation, a marker of lipid peroxidation, was enhanced, alongside a decrease in platelet alpha-tocopherol.

Conclusions:

  • Diamide-induced oxidative stress in platelets is associated with decreased antioxidant capacity.
  • Enhanced basal lipoxygenase activity, indicated by increased 12-HETE, may be linked to a compromised platelet antioxidant status.
  • These findings highlight the sensitivity of platelet AA metabolism to redox changes and potential implications for thrombotic disorders.