Abstract
Male mice were treated with structurally diverse herbicides to study their effect on liver xenobiotic-metabolizing enzymes. Chlorfiurecol, trifluralin, alachlor, propham, MCPP and 2,4-DP caused increases in phase I (cytochrome P-450, ethoxycoumarin O-deethylase, and/or aminopyrine N-demethylase) and phase II (microsomal epoxide hydrolase and cytosolic glutathione S-transferase) activities. MCPP and 2,4-DP also increased cytosolic epoxide hydrolase and carnitine acetyltransferase activities suggestive of peroxisome proliferation. Benthiocarb and molinate increased only some phase II enzyme activities. Dicamba, at the dose employed, caused mortality and decreases in some of the enzymes monitored. Most of the herbicides tested induced xenobiotic-metabolizing enzyme activities, the pattern of induction being dependent on herbicide structure.
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