Induction of mixed-function oxidase activity in mouse lymphoid tissues by polycyclic aromatic hydrocarbons
Polycyclic aromatic hydrocarbon (PAH) exposure can cause mixed-function oxidase (MFO) enzyme induction in certain tissues of various organisms. Measurements of such induction might serve as a useful bioindicator of human exposure to PAHs, provided readily obtainable human tissues can be utilized for such measurements. The authors have investigated the MFO activity in various lymphoid tissues of the C3H mouse as a model system and have studied the effect of systemic PAH treatment on such enzyme activity. An MFO enzyme assay was used to measure the activity of 7-ethoxyresorufin deethylase, an enzyme activity that may be specific for the cytochrome P-448 subset of MFO enzymes (those enzymes that are induced in cells or tissues following PAH administration). Intraperitoneal injection of mice with 180 mg/kg (4.6 mg) benzo(a)pyrene (BaP) or 160 mg/kg (4.0 mg) 3-methylcholanthrene (MC) produced a significant induction in MFO activity in mouse spleen S9 fractions 48 h after the injection. Induction ratios (induced activity/control activity) between 4 and 5 were seen with BaP; MC produced induction ratios of 2.5-3.0. Enzyme activity was not induced in the spleen within 16 h following BaP or MC administration. Other experiments indicated that MFO activity could be induced in thymus cells 48 h after either BaP or MC treatment. Treatment with BaP or MC did produce significant enzyme induction in the liver and lung tissues from the animals both 16 and 48 h after chemical treatment.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5002528
- Journal Information:
- J. Toxicol. Environ. Health; (United States), Vol. 19:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
3-METHYLCHOLANTHRENE
BIOLOGICAL EFFECTS
BENZOPYRENE
MIXED-FUNCTION OXIDASES
ENZYME INDUCTION
SPLEEN
THYMUS CELLS
BIOLOGICAL INDICATORS
EXPERIMENTAL DATA
LIVER
LUNGS
MICE
ANIMAL CELLS
ANIMALS
AROMATICS
BODY
CONDENSED AROMATICS
DATA
DIGESTIVE SYSTEM
ENZYMES
GENE REGULATION
GLANDS
HYDROCARBONS
INFORMATION
MAMMALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANS
OXIDOREDUCTASES
OXYGENASES
POLYCYCLIC AROMATIC HYDROCARBONS
RESPIRATORY SYSTEM
RODENTS
SOMATIC CELLS
VERTEBRATES
560301* - Chemicals Metabolism & Toxicology- Cells- (-1987)