Induction of MFO enzymes and production of bile metabolites in rainbow trout (Oncorhynchus mykiss) exposed to waste crankcase oil

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Environmental Toxicology and Chemistry; (United States)

DOI:https://doi.org/10.1897/1552-8618(1993)12[2105:IOMEAP]2.0.CO;2· OSTI ID:5810193

Upshall, C; Payne, J F; Hellou, J ^[1]

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1. St. John's, Newfoundland (Canada). Dept. of Fisheries and Oceans

It is difficult to assess the toxicological significance of complex mixtures of contaminants in the environment because of paucity of dose-response studies. Rainbow trout (Oncorhynchus mykiss) were exposed per os to waste crankcase oil and analyzed for hydrocarbon classes, 26 polycyclic aromatic compounds (PACs) and 66 elements. MFO enzyme activity, measured as 7-ethoxyresorufin O-deethylase (EROD) was induced in liver, kidney, and heart. The threshold level for induction in liver was approximately 3 mg of PACs (sum of 26 PACs) per kilogram fish. A dose-response relationship was obtained for liver and kidney but not for the heart. In a time-response study, liver, kidney, and heart MFL activity increase (14-, 5-, and 3-fold, respectively), reaching a maximum between days 1 and 4, then decreased to basal levels by day 12. Analysis of bile metabolites, as glucuronide and sulfate conjugates, showed a pattern similar to that displayed by MFO induction, possibly with a slight delay. This study establishes time- and dose-response relationships for MFO enzyme induction and appearance of bile metabolites in fish exposed to an environmentally important source of PACs.

• OSTI ID: 5810193
• Journal Information: Environmental Toxicology and Chemistry; (United States), Vol. 12:11; ISSN 0730-7268
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
OXIDOREDUCTASES
ENZYME INDUCTION
TROUT
SENSITIVITY
WASTE OILS
METABOLISM
DOSE-RESPONSE RELATIONSHIPS
ENZYME ACTIVITY
ANIMALS
AQUATIC ORGANISMS
ENZYMES
FISHES
GENE REGULATION
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PROTEINS
VERTEBRATES
560300* - Chemicals Metabolism & Toxicology