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[Hepatic microsomal monoxygenase inhibition by nabam in the rat (author's transl)]
Abstract:
Nabam (fungicide dithiocarbamate) has been incorporated with the diet of rats during six months (the doses were: 0, 10, 50, 100, 500, 1000 and 2000 ppm). It decreases significantly the hepatic microsomal enzymes activity (aniline hydroxylase and aminopyrine N-demethylase and the liver P 450 content, but the cytochrome b 5 concentration doesn't seem to be modified. The microsomal lipidic and proteic content is only modified with the highest Nabam dose. Several hypotheses may be proposed to explain the Nabam effects: one is the inhibition of the monooxygenases and their biosynthesis repression.
Insights
Nabam, a dithiocarbamate fungicide, significantly reduced hepatic microsomal enzymes and P450 content in rats over six months. High doses also affected microsomal lipid and protein levels, suggesting monooxygenase inhibition.
Area of Science:
- Toxicology
- Biochemistry
- Environmental Health
Context:
- Dithiocarbamate fungicides, like Nabam, are widely used in agriculture.
- Understanding their toxicological effects on mammalian systems is crucial for risk assessment.
- Hepatic microsomal enzymes play a vital role in xenobiotic metabolism.
Purpose:
- To investigate the effects of chronic Nabam exposure on rat liver function.
- To determine the impact of Nabam on key hepatic microsomal enzymes and P450 content.
- To explore potential mechanisms underlying Nabam's hepatotoxicity.
Summary:
- Rats were fed Nabam at doses ranging from 0 to 2000 ppm for six months.
- Nabam significantly decreased hepatic microsomal enzymes (aniline hydroxylase, aminopyrine N-demethylase) and cytochrome P450 content.
- Higher Nabam doses altered microsomal lipid and protein content, indicating potential cellular damage.
Impact:
- Nabam exposure can impair the liver's metabolic capacity, potentially affecting drug and xenobiotic detoxification.
- Findings suggest Nabam may exert toxicity through inhibition of monooxygenases and their biosynthesis.
- This research highlights the need for careful evaluation of dithiocarbamate fungicide safety in environmental and occupational settings.