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- W2149377711 abstract "Antisense phosphorodiamidate morpholino oligomers (PMO) inhibit targeted gene expression by preventing ribosomal assembly, thus preventing translation. Inhibition of cytochrome P450 (P450) 3A4 expression was examined in primary human hepatocytes from 11 donors and in Caco-2 cells (stably transfected with CYP3A4 cDNA on an extrachromosomal vector) by evaluating the metabolism of substrate 7-benzyloxy-4-[trifluoromethyl]-coumarin and Western immunoblot analysis. Cellular uptake of PMO was confirmed in both cell systems using fluorescein-labeled PMOs. Three antisense PMO sequences and two control PMO sequences were tested. AVI-4557, a 20-mer PMO with the sequence 5'-CTGGGATGAGAGCCATCACT-3' was selected as the optimal agent. AVI-4557 inhibited expression of CYP3A4 in Caco-2/h3A4 cells by 64% at 24 h following administration of 2.8 microM by an assisted delivery protocol. Inhibition of CYP3A activity was observed in primary human hepatocytes after 24 h exposure to AVI-4557 by an average of 32 +/- 11%. Furthermore, AVI-4557 exposure resulted in a sequence-dependent inhibition of cyclophosphamide-related cytocidal activity and a sequence-dependent induction of paclitaxel-related cytocidal activity in both cell types. Finally, the cytocidal activity of cisplatin was not affected with AVI-4557 treatment in either cell type. These studies indicate AVI-4557 is an effective and specific inhibitor of CYP3A4 expression." @default.
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- W2149377711 date "2002-07-01" @default.
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- W2149377711 title "Phosphorodiamidate Morpholino Antisense Oligomers Inhibit Expression of Human Cytochrome P450 3A4 and Alter Selected Drug Metabolism" @default.
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- W2149377711 doi "https://doi.org/10.1124/dmd.30.7.757" @default.
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