Effects of motorcycle exhaust on cytochrome P-450-dependent monooxygenases and glutathione S-transferase in rat tissues

Tzuu Huei Ueng, Wen Po Hwang, Ruei Ming Chen, Hui Wu Wang, Min Liang Kuo, Sang S. Park, F. Peter Guengerich

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Abstract

The effects of motorcycle exhaust (ME) on cytochrome P-450 (P-450)-dependent monooxygenases were determined using rats exposed to the exhaust by either inhalation, intratracheal, or intraperitoneal administration. A 4-wk ME inhalation significantly increased benzo[a]pyrene hydroxylation, 7-ethoxyresorufin O-deethylation, and NADPH-cytochrome c reductase activities in liver, kidney, and lung microsomes. Intratracheal instillation of organic extracts of ME particulate (MEP) caused a dose- and time-dependent significant increase of monooxygenase activity. Intratracheal treatment with 0.1 g MEP extract/kg markedly elevated benzo[a]pyrene hydroxylation and 7-ethoxyresorufin O-deethylation activities in the rat tissues 24 h following treatment. Intraperitoneal treatment with 0.5 g MEP extract/kg/d for 4 d resulted in significant increases of P-450 and cytochrome b5 contents and NADPH-cytochrome c reductase activity in liver microsomes. The intraperitoneal treatment also markedly increased monooxygenases activities toward methoxyresorufin, aniline, benzphetamine, and erythromycin in liver and benzo[a]pyrene and 7-ethoxyresorufin in liver, kidney, and lung. Immunoblotting analyses of microsomal proteins using a mouse monoclonal antibody (Mab) 1-12-3 against rat P-450 1A1 revealed that ME inhalation, MEP intratracheal, or MEP intraperitoneal treatment increased a P-450 1A protein in the hepatic and extrahepatic tissues. Protein blots analyzed using antibodies to P-450 enzymes showed that MEP intraperitoneal treatment caused increases of P-450 2B, 2E, and 3A subfamily proteins in the liver. The ME inhalation, MEP intratracheal, or MEP intraperitoneal treatment resulted in significant increases in glutathione S-transferase activity in liver cytosols. The present study shows that ME and MEP extract contain substances that can induce multiple forms of P-450 and glutathione S-transferase activity in the rat.

Original languageEnglish
Pages (from-to)509-527
Number of pages19
JournalJournal of Toxicology and Environmental Health - Part A
Volume54
Issue number7
Publication statusPublished - 1998
Externally publishedYes

Fingerprint

Motorcycles
Glutathione Transferase
Liver
Cytochrome P-450 Enzyme System
cytochrome
Rats
Tissue
Proteins
Inhalation
Benzo(a)pyrene
Mixed Function Oxygenases
pyrene
Pyrene
NADPH-Ferrihemoprotein Reductase
Hydroxylation
protein
antibody
Benzphetamine
Kidney
Cytochromes b5

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Public Health, Environmental and Occupational Health
  • Pollution
  • Toxicology
  • Health, Toxicology and Mutagenesis

Cite this

Effects of motorcycle exhaust on cytochrome P-450-dependent monooxygenases and glutathione S-transferase in rat tissues. / Ueng, Tzuu Huei; Hwang, Wen Po; Chen, Ruei Ming; Wang, Hui Wu; Kuo, Min Liang; Park, Sang S.; Guengerich, F. Peter.

In: Journal of Toxicology and Environmental Health - Part A, Vol. 54, No. 7, 1998, p. 509-527.

Research output: Contribution to journalArticle

Ueng, Tzuu Huei ; Hwang, Wen Po ; Chen, Ruei Ming ; Wang, Hui Wu ; Kuo, Min Liang ; Park, Sang S. ; Guengerich, F. Peter. / Effects of motorcycle exhaust on cytochrome P-450-dependent monooxygenases and glutathione S-transferase in rat tissues. In: Journal of Toxicology and Environmental Health - Part A. 1998 ; Vol. 54, No. 7. pp. 509-527.
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