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- W2010546204 abstract "ABSTRACT PF-00868554 is a nonnucleoside inhibitor of the hepatitis C virus (HCV) RNA polymerase, which exerts its inhibitory effect by binding to the thumb base domain of the protein. It is a potent and selective inhibitor, with a mean 50% inhibitory concentration of 0.019 μM against genotype 1 polymerases and a mean 50% effective concentration (EC 50 ) of 0.075 μM against the genotype 1b-Con1 replicon. To determine the in vitro antiviral activity of PF-00868554 against various HCV strains, a panel of chimeric replicons was generated, in which polymerase sequences derived from genotype 1a and 1b clinical isolates were cloned into the 1b-Con1 subgenomic reporter replicon. Our results indicate that PF-00868554 has potent in vitro antiviral activity against a majority (95.8%) of genotype 1a and 1b replicons, with an overall mean EC 50 of 0.059 μM. PF-00868554 showed no cytotoxic effect in several human cell lines, up to the highest concentration evaluated (320 μM). Furthermore, the antiviral activity of PF-00868554 was retained in the presence of human serum proteins. An in vitro resistance study of PF-00868554 identified M423T as the predominant resistance mutation, resulting in a 761-fold reduction in susceptibility to PF-00868554 but no change in susceptibility to alpha interferon and a polymerase inhibitor that binds to a different region. PF-00868554 also showed good pharmacokinetic properties in preclinical animal species. Our results demonstrate that PF-00868554 has potent and broad-spectrum antiviral activity against genotype 1 HCV strains, supporting its use as an oral antiviral agent in HCV-infected patients." @default.
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- W2010546204 date "2009-06-01" @default.
- W2010546204 modified "2023-10-01" @default.
- W2010546204 title "Preclinical Characterization of PF-00868554, a Potent Nonnucleoside Inhibitor of the Hepatitis C Virus RNA-Dependent RNA Polymerase" @default.
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- W2010546204 doi "https://doi.org/10.1128/aac.01599-08" @default.
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