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Related Experiment Videos

Endothelial nitric oxide synthase-dependent superoxide generation from adriamycin

J Vásquez-Vivar1, P Martasek, N Hogg

  • 1Biophysics Research Institute and Department of Pathology, Caridiovascular Research Center, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.

Biochemistry
|October 23, 1997
PubMed
Summary

Adriamycin (doxorubicin) chemotherapy causes cardiotoxicity by forming superoxide. The enzyme endothelial nitric oxide synthase (eNOS) activates Adriamycin, increasing superoxide and decreasing nitric oxide, potentially harming vasculature.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Cardiovascular Research

Background:

  • Adriamycin (doxorubicin) is a potent chemotherapeutic agent with broad-spectrum activity.
  • Clinical application is limited by dose-dependent cardiotoxicity, associated with superoxide radical formation.
  • Flavoenzymes catalyze Adriamycin reduction, generating superoxide and contributing to oxidative stress.

Purpose of the Study:

  • To investigate the interaction between Adriamycin and endothelial nitric oxide synthase (eNOS).
  • To determine if eNOS mediates Adriamycin reduction and subsequent superoxide generation.
  • To elucidate the impact of this interaction on nitric oxide production and vascular health.

Main Methods:

  • Enzymatic assays measuring NADPH consumption and superoxide generation in the presence of Adriamycin and eNOS.

Related Experiment Videos

  • Kinetic analysis to determine Adriamycin binding affinity (Km) to eNOS.
  • Experiments using calcium/calmodulin and flavoenzyme inhibitors (diphenyleneiodonium) to localize Adriamycin reduction.

    • Main Results:

    • eNOS was demonstrated to reduce Adriamycin to its semiquinone radical.
    • Adriamycin binding to eNOS occurred with a Km of approximately 5 microM.
    • eNOS-mediated Adriamycin reduction enhanced superoxide formation and decreased nitric oxide production, independent of calcium/calmodulin but sensitive to flavoenzyme inhibition.

    Conclusions:

    • Adriamycin undergoes reductive activation at the reductase domain of eNOS.
    • This interaction disrupts the balance between nitric oxide and superoxide production.
    • eNOS-mediated Adriamycin activation may contribute to vascular pathologies through increased oxidant generation (peroxynitrite, hydrogen peroxide).