Investigations have been carried out to determine the effects of the
herbicide 1.1.1 trifluoro-N-(2-methyl-4-phenyl sulfonyl) methane
sulfonamide (
Destun) on some hepatic microsomal
drug metabolizing
enzymes in rat. Administration of 100 mg
herbicide/kg rat (i.p. or oral) resulted in a stimulation of
aniline hydroxylase and p-aminopyrene
N-demethylase activities by 1.3 fold and 1.6 fold respectively. A dose-related increase in
enzyme activities was observed with a maximum effect at about 100 mg
Destun/kg rat. The increased microsomal
protein content, liver
weight: body weight ratio and decreased sleeping time in the
herbicide-treated animals indicated the possibility of
Destun being an "inducer". Results of investigations on the kinetic properties of
aniline hydroxylase and p-aminopyrene-
N-demethylase on administration of
Destun suggests that in addition to its inducer effect, the
herbicide could stimulate the
enzyme activities by decreasing the affinity of these
enzymes for their respective substrates.