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Related Experiment Videos

Reactive nitrogen oxygen species metabolize N-acetylbenzidine.

V M Lakshmi1, F F Hsu, B B Davis

  • 1VA Medical Center, Division of Geriatric Medicine, and Department of Biochemistry, St. Louis University School of Medicine, St. Louis, Missouri 63104, USA.

Chemical Research in Toxicology
|March 22, 2001
PubMed
Summary
This summary is machine-generated.

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Reactive nitric oxygen species (RNOS) transform N-acetylbenzidine (ABZ) into unique products, including 3'-nitro-ABZ. These transformations, particularly in neutrophils, may indicate cancer risk and serve as biomarkers for reactive species.

Area of Science:

  • Biochemistry
  • Toxicology
  • Cancer Research

Background:

  • Aromatic amines are linked to certain cancers.
  • Inflammation involves reactive nitric oxygen species (RNOS) that can damage tissues.
  • The interaction between RNOS and aromatic amines requires further investigation.

Purpose of the Study:

  • To investigate the transformation of N-acetylbenzidine (ABZ) by RNOS.
  • To identify the products formed from the reaction of ABZ with different RNOS.
  • To explore the potential role of these products as biomarkers.

Main Methods:

  • N-acetylbenzidine (ABZ) was reacted with various generated RNOS.
  • High-performance liquid chromatography (HPLC) was used for sample evaluation.
  • Nuclear magnetic resonance ((1)H NMR) and mass spectrometry identified reaction products.

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Main Results:

  • Nitrogen dioxide radical and peroxynitrite generated 3 itro-ABZ from ABZ.
  • Conditions generating N(2)O(3) produced 4 ahydroxy-4-acetylaminobiphenyl (4 ahydroxy-AABP) and 4-acetylaminobiphenyl (AABP).
  • Human neutrophils produced 3 itro-ABZ from ABZ in the presence of NO(2)(-).

Conclusions:

  • ABZ forms distinct products when exposed to nitrosating and nitrating RNOS.
  • The formation of 3 itro-ABZ in neutrophils suggests a potential link to myeloperoxidase activity.
  • These unique products could influence carcinogenesis and serve as biomarkers for reactive species.