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Fenpropimorph (N-[3-(p-t-butylphenyl)-2-methylpropyl]-cis-2,6-dimethylmorpholine), a morpholine fungicide known to be an inhibitor of sterol biosynthesis in fungi and in higher plants, was demonstrated to be an efficient inhibitor of cholesterol biosynthesis in cultured Swiss 3T3 fibroblasts. Treatment of the mammalian cells with fenpropimorph resulted in a dose-dependent inhibition of [14C]acetate incorporation into the C27 sterols [IC50 (concentration causing half-maximal inhibition) = 0.5 microM], which was accompanied by an accumulation of polar sterols and a decrease in cellular hydroxymethylglutaryl-CoA reductase activity. Exposure of the cells to the drug affected cell growth. Analysis of the sterols in the growth-arrested and in the pulse-labelled cells indicate that fenpropimorph has, in the sterol-biosynthetic pathway, target enzymes in mammalian cells different from those in the other phyla. Whereas in plants and fungi fenpropimorph mainly affects sterol isomerases and reductases, in the fibroblasts its main target seems to be the demethylation of lanosterol.

Inhibition by the fungicide fenpropimorph of cholesterol biosynthesis in 3T3 fibroblasts