The role of iron in reactive oxygen species generation from diesel exhaust particles

Sungjo Park, Haeyun Nam, Namhyun Chung, Jung Duck Park, Young Lim

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Diesel exhaust particles (DEP) are known to produce reactive oxygen species (ROS), which induce oxidative stress and inflammation in the lung and respiratory tract. DEP are composed of polycyclic aromatic hydrocarbons (PAH) and their derivatives, redox active semi-quinones, and trace amounts of heavy metals. ROS production was measured by thiobarbituric acid-reactive substances of deoxyribose (TBARS) formation from DEP samples obtained from Korea (DEP-KO), and the Standard Reference Material (SRM) 2975 to explore the role of transition metals. Both DEP-KO and SRM2975 had similar amounts of transition metals, whereas DEP-KO contained more iron, but less copper and zinc, than SRM2975. The water-soluble fraction from SRM2975, but not that from DEP-KO, had a broad absorption in the visible region, but not from DEP-KO, obscuring an accurate absorption measurement of TBARS. Fluorescence measurements of TBARS generation in a water-soluble extract showed that SRM2975 produces more TBARS, but the addition of hydrogen peroxide (H 2O 2) generated more TBARS in DEP-KO than in SRM2975, consistent with the higher amounts of iron in DEP-KO. The incubation of DEP with iron chelators inhibited the production of TBARS. Finally, a novel use of the fluorogenic spin trap probe, proxyl fluorescamine, enabled the detection of the ROS production from both DEP-KO and SRM2975. Our findings suggested that careful consideration is needed to measure TBARS production in DEP, and that iron in DEP seems to be more important than other transition metals in H 2O 2-induced ROS generation.

Original languageEnglish
Pages (from-to)851-857
Number of pages7
JournalToxicology in Vitro
Volume20
Issue number6
DOIs
Publication statusPublished - 2006 Sep 1

Fingerprint

Vehicle Emissions
Reactive Oxygen Species
Iron
Deoxyribose
Thiobarbituric Acid Reactive Substances
Transition metals
Metals
Fluorescamine
Quinones
Oxidative stress
Water
Polycyclic Aromatic Hydrocarbons
Korea
Chelating Agents
Heavy Metals
Respiratory System
Hydrogen Peroxide

Keywords

  • DEP
  • Hydrogen peroxide
  • Iron
  • ROS
  • TBARS

ASJC Scopus subject areas

  • Toxicology

Cite this

The role of iron in reactive oxygen species generation from diesel exhaust particles. / Park, Sungjo; Nam, Haeyun; Chung, Namhyun; Park, Jung Duck; Lim, Young.

In: Toxicology in Vitro, Vol. 20, No. 6, 01.09.2006, p. 851-857.

Research output: Contribution to journalArticle

Park, Sungjo ; Nam, Haeyun ; Chung, Namhyun ; Park, Jung Duck ; Lim, Young. / The role of iron in reactive oxygen species generation from diesel exhaust particles. In: Toxicology in Vitro. 2006 ; Vol. 20, No. 6. pp. 851-857.
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