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Pentoxifylline. A hydroxyl radical scavenger

J P Freitas1, P M Filipe

  • 1Clínica Dermatológica Universitária, Faculdade de Medicina de Lisboa, Portugal.

Biological Trace Element Research
|January 1, 1995
PubMed
Summary
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Pentoxifylline (PTX) effectively scavenges hydroxyl radicals, demonstrating its antioxidant capabilities. However, PTX did not show efficacy as a superoxide anion scavenger in the studied in vitro system.

Area of Science:

  • Biochemistry
  • Pharmacology

Background:

  • Pentoxifylline (PTX), a xanthine derivative, is known for improving microcirculation and possessing anti-inflammatory and antifibrotic effects.
  • Its potential as an antioxidant agent warrants further investigation.

Purpose of the Study:

  • To investigate the reaction of Pentoxifylline (PTX) with hydroxyl radical and superoxide anion.
  • To evaluate PTX's efficacy as a free radical scavenger.

Main Methods:

  • Hydroxyl radical generation using ascorbic acid, H2O2, and Fe(III)-EDTA.
  • Assessment of iron-dependent deoxyribose degradation in the presence of varying PTX concentrations.
  • Evaluation of PTX's effect on superoxide anion generated in vitro via a hypoxanthine-xanthine oxidase system.

Main Results:

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  • Pentoxifylline (PTX) demonstrated a significant reaction rate with hydroxyl radical (1.1 x 10^10 M^-1s^-1), confirming its role as a hydroxyl radical scavenger.
  • PTX did not exhibit scavenging activity against superoxide anion in the hypoxanthine-xanthine oxidase system.

Conclusions:

  • Pentoxifylline (PTX) possesses significant hydroxyl radical scavenging properties.
  • PTX is not effective as a superoxide anion scavenger in the in vitro model studied.