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Comparative Study | Journal Article | Research Support, U.S. Gov't, P.H.S.

Inhibition of hepatitis B virus by a novel L-nucleoside, 2'-fluoro-5-methyl-beta-L-arabinofuranosyl uracil.

S Balakrishna Pai, S H Liu, Y L Zhu, C K Chu, Y C Cheng
S Balakrishna Pai
Department of Pharmacology, Yale University, New Haven, Connecticut 06510, USA.
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S H Liu
Department of Pharmacology, Yale University, New Haven, Connecticut 06510, USA.
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Y L Zhu
Department of Pharmacology, Yale University, New Haven, Connecticut 06510, USA.
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C K Chu
Department of Pharmacology, Yale University, New Haven, Connecticut 06510, USA.
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Y C Cheng
Department of Pharmacology, Yale University, New Haven, Connecticut 06510, USA.
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DOI: 10.1128/AAC.40.2.380
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ABSTRACT

2'-Fluoro-5-methyl-beta-L-arabinofuranosyl uracil (L-FMAU) was discovered to have potent antiviral activity against hepatitis B virus (HBV). L-FMAU was more potent than its D-enantiomer and produced dose-dependent inhibition of the viral DNA replication in 2.2.15 cells (human HepG2 cells with the HBV genome), with a 50% inhibitory concentration of 0.1 microM. There was no inhibitory effect on HBV transcription or protein synthesis. In the 2.2.15 cell system, L-FMAU did not show any toxicity up to 200 microM, whereas the D-enantiomer was toxic, with a 50% inhibitory concentration of 50 microM. Repeated treatments of HepG2 cells with L-FMAU at a 1 microM concentration for 9 days did not result in any decrease in the total mitochondrial DNA content, suggesting that a mode of toxicity similar to that produced by 2',3'-dideoxycytidine is unlikely. Also at concentrations as high as 200 microM, L-FMAU did not adversely affect mitochondrial function as determined by lactic acid production by L-FMAU-treated hepatoma cells. L-FMAU was metabolized in the cells to its mono-, di-, and triphosphates, A dose-dependent inhibition of HBV DNA synthesis by L-FMAU triphosphate was observed in the DNA polymerase assays with isolated HBV particles, suggesting that the mode of action of this compound could involve viral polymerase. However, L-FMAU was not incorporated into the cellular DNA. Considering the potent inhibition of the viral DNA synthesis and the nontoxicity of L-FMAU towards the host DNA synthetic machinery, this compound should be further explored for development as asn anti-HBV drug.

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Inhibition of hepatitis B virus by a novel L-nucleoside, 2'-fluoro-5-methyl-beta-L-arabinofuranosyl uracil.
S Balakrishna Pai, S H Liu, Y L Zhu, C K Chu, Y C Cheng
Antimicrobial Agents and Chemotherapy Feb 1996, 40 (2) 380-386; DOI: 10.1128/AAC.40.2.380

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Inhibition of hepatitis B virus by a novel L-nucleoside, 2'-fluoro-5-methyl-beta-L-arabinofuranosyl uracil.
S Balakrishna Pai, S H Liu, Y L Zhu, C K Chu, Y C Cheng
Antimicrobial Agents and Chemotherapy Feb 1996, 40 (2) 380-386; DOI: 10.1128/AAC.40.2.380
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