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• W2014377427 abstract "1-(S)-[3-hydroxy-2-(phosphonomethoxy)propyl]-5-azacytosine [HPMP-5-azaC], the 5-azacytosine analogue of cidofovir (HPMPC), represents a new acyclic nucleoside phosphonate with pronounced activity against DNA viruses, and a selectivity index superior to that of cidofovir. Here we investigated the intracellular metabolic pathway of [6-(3)H]-HPMP-5-azaC. By comparing the metabolism in mouse lymphosarcoma S49-wild type (S49-WT) and mutant cells deficient for dCMP deaminase, we identified the mono- and diphosphate metabolites generated from HPMP-5-azaC and its deaminated product HPMP-5-azaU. In human lung carcinoma A549 cells, the relative formation of the deaminated metabolites was only 6%, implying that deamination plays a minor role in the overall metabolism of HPMP-5-azaC. The diphosphorylated metabolite of HPMP-5-azaC accounted for 60% of the total radioactivity, and reached intracellular levels which were 60-fold higher in absolute value than the corresponding diphosphate levels obtained with cidofovir. Consequently to its increased activation, HPMP-5-azaC showed about 45-fold higher incorporation into cellular DNA than cidofovir. Herpes-, pox- or adenovirus infection had no marked influence on the metabolism of HPMP-5-azaC. The HPMP-5-azaC-diphosphate metabolite was shown to have long intracellular stability (half-life: 63h), suggesting that infrequent administration of HPMP-5-azaC should be possible. HPMP-5-azaC represents a new acyclic nucleoside phosphonate compound with promising anti-DNA virus activity and a favorable metabolic profile that is characterized by low sensitivity to catabolic deamination and a high rate of phosphorylation and DNA incorporation." @default.
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• W2014377427 date "2008-10-01" @default.
• W2014377427 modified "2023-10-14" @default.
• W2014377427 title "Intracellular metabolism of the new antiviral compound 1-(S)-[3-hydroxy-2-(phosphonomethoxy)propyl]-5-azacytosine" @default.
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• W2014377427 doi "https://doi.org/10.1016/j.bcp.2008.08.009" @default.
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