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Effect of PCB on some MFO enzyme activities in pregnant and virgin rabbits
Abstract:
Fenclor 64 (a PCB's commercial mixture) was administered twice i.p. to virgin and pregnant New Zealand rabbits at the dose of 100 mg/Kg to evaluate its inducing properties on the following hepatic microsomal MFO activities: p-nitro-anisole-O-demethylase, amino-pyrine-N-demethylase, acetanilide-hydroxylase and aryl-hydrocarbons-hydroxylase. The results indicate that Fenclor 64 evoked a "mixed type" induction in virgin as well as in pregnant rabbits since it increased liver weight, cytochrome P-450 levels, as well as p-nitro-anisole-O-demethylase and acetanilide-hydroxylase. Pregnancy by itself affects only amino-pyrine-N-demethylase levels.
Insights
Fenclor 64, a polychlorinated biphenyl (PCB) mixture, induced mixed-type liver enzyme changes in both virgin and pregnant rabbits. Pregnancy alone impacted amino-pyrine-N-demethylase levels.
Area of Science:
- Toxicology
- Pharmacology
- Biochemistry
Background:
- Polychlorinated biphenyls (PCBs) are environmental pollutants with known toxic effects.
- Understanding PCB metabolism and induction of hepatic enzymes is crucial for risk assessment.
Purpose of the Study:
- To evaluate the effects of Fenclor 64, a commercial PCB mixture, on hepatic microsomal MFO activities in virgin and pregnant rabbits.
- To determine if pregnancy modifies the induction properties of Fenclor 64.
Main Methods:
- Fenclor 64 was administered intraperitoneally to virgin and pregnant New Zealand rabbits at 100 mg/Kg.
- Key hepatic microsomal MFO activities were measured: p-nitro-anisole-O-demethylase, amino-pyrine-N-demethylase, acetanilide-hydroxylase, and aryl-hydrocarbons-hydroxylase.
- Liver weight and cytochrome P-450 levels were also assessed.
Main Results:
- Fenclor 64 induced a mixed-type response in both virgin and pregnant rabbits.
- Increased liver weight, cytochrome P-450 levels, p-nitro-anisole-O-demethylase, and acetanilide-hydroxylase activities were observed.
- Pregnancy alone significantly affected amino-pyrine-N-demethylase levels.
Conclusions:
- Fenclor 64 exhibits mixed-type induction of hepatic MFO activities.
- Pregnancy status influences the response to PCB exposure, specifically impacting amino-pyrine-N-demethylase.
- These findings contribute to understanding PCB toxicology in different physiological states.