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Pycnogenol enhances endothelial cell antioxidant defenses.

Z H Wei1, Q L Peng1, B H Lau1

  • 1a Department of Microbiology and Molecular Genetics , School of Medicine, Loma Linda University , Loma Linda , CA , USA.

Redox Report : Communications in Free Radical Research
|July 15, 2016
PubMed
Summary

Pycnogenol enhances cellular defense against oxidative stress by boosting antioxidant systems. This natural compound increases the clearance of harmful reactive oxygen species (ROS) and strengthens key enzymes involved in cellular protection.

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Area of Science:

  • Cellular and Molecular Biology
  • Biochemistry
  • Oxidative Stress Research

Background:

  • Reactive oxygen species (ROS) are implicated in numerous pathologies, including cancer, diabetes, and aging.
  • Antioxidant systems, such as the glutathione (GSH) redox cycle and enzymes like superoxide dismutase (SOD) and catalase (CAT), are crucial for scavenging ROS.
  • Pycnogenol has demonstrated protective effects against oxidant-induced injury in endothelial cells.

Purpose of the Study:

  • To investigate the impact of Pycnogenol on the cellular metabolism of hydrogen peroxide (H2O2) and superoxide anion (O2(-)).
  • To determine Pycnogenol's effects on glutathione-dependent and -independent antioxidant enzymes in bovine pulmonary artery endothelial cells (PAEC).

Main Methods:

  • PAEC were treated with Pycnogenol, and oxidative stress was induced using hypoxanthine/xanthine oxidase or H2O2.
  • Cellular clearance rates of H2O2 and O2(-) were measured.
  • Intracellular GSH levels and the activities of antioxidant enzymes (GSH peroxidase, GSH disulfide reductase, SOD, CAT) were assessed.

Main Results:

  • Pycnogenol demonstrated a concentration-dependent increase in the clearance of H2O2 and O2(-).
  • Intracellular GSH content and the activities of GSH peroxidase and GSH disulfide reductase were significantly elevated.
  • Activities of SOD and CAT were also enhanced by Pycnogenol treatment.

Conclusions:

  • Pycnogenol promotes a protective antioxidant state in PAEC.
  • The compound upregulates both enzymatic and nonenzymatic ROS scavenging systems.
  • These findings suggest Pycnogenol's potential therapeutic role in conditions associated with oxidative stress.