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Oxygen-Glucose Deprivation and Reoxygenation as an In Vitro Ischemia-Reperfusion Injury Model for Studying Blood-Brain Barrier Dysfunction
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Epigallocatechin gallate can significantly decrease free oxygen radicals in the reperfusion injury in vivo.

Rolf Büttemeyer1, A W Philipp, L Schlenzka

  • 1Plastic Surgery, Department of General, Vascular and Thoracic Surgery, Medical Faculty (Charité), Humboldt-University of Berlin, Campus-Mitte, Schumannstrasse 20-21, 10117 Berlin, Germany. rolf.buettemeyer@charite.de

Transplantation Proceedings
|December 31, 2003
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Summary

Epigallocatechin gallate (EGCG) significantly reduced superoxide production during reperfusion in rat muscle tissue. This antioxidant demonstrates therapeutic potential for ischemia-reperfusion injury by scavenging free radicals.

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Area of Science:

  • Biomedical Science
  • Pharmacology
  • Physiology

Background:

  • Oxygen-derived free radicals, particularly superoxide (O(2)(-)), are implicated in tissue damage during ischemia-reperfusion injury.
  • Natural polyphenols, such as Epigallocatechin gallate (EGCG), exhibit potent antioxidant properties in vitro, with EGCG showing significantly higher superoxide scavenging activity than ascorbic acid.

Purpose of the Study:

  • To investigate the in vivo impact of EGCG on superoxide production in rat muscle tissue during reperfusion following defined periods of ischemia.
  • To utilize a novel cytochrome c-based biosensor for on-line monitoring of superoxide concentrations in vivo.

Main Methods:

  • Male Wistar rats underwent femoral vessel clamping to induce ischemia (60 or 120 minutes).
  • A cytochrome c-based biosensor was inserted into the gastrocnemius muscle for real-time superoxide monitoring.
  • EGCG (4 mg/kg) was administered intravenously at reperfusion in experimental groups, with saline and untreated groups serving as controls.

Main Results:

  • EGCG administration significantly reduced peak superoxide concentrations by approximately 50% after both 60 and 120 minutes of ischemia (P <.01).
  • Histological analysis revealed reduced muscle cell injury and neutrophil infiltration in EGCG-treated groups compared to controls.
  • Saline administration did not affect superoxide levels, confirming the specific effect of EGCG.

Conclusions:

  • This study provides the first on-line in vivo verification of an antioxidant's scavenging activity.
  • EGCG effectively diminishes superoxide production in muscle tissue following ischemia-reperfusion, highlighting its therapeutic potential.