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Antimicrob Agents Chemother. 2012 Mar;56(3):1170-81. doi: 10.1128/AAC.05383-11. Epub 2011 Dec 12.

Pharmacodynamic analysis of a serine protease inhibitor, MK-4519, against hepatitis C virus using a novel in vitro pharmacodynamic system.

Author information

1
Institute for Therapeutic Innovation, College of Medicine, Department of Medicine, University of Florida—Albany Campus, Albany, New York, USA.

Abstract

The development of new antiviral compounds active against hepatitis C virus (HCV) has surged in recent years. In order for these new compounds to be efficacious in humans, optimal dosage regimens for each compound must be elucidated. We have developed a novel in vitro pharmacokinetic/pharmacodynamic system, the BelloCell system, to identify optimal dosage regimens for anti-HCV compounds. In these experiments, genotype 1b HCV replicon-bearing cells (2209-23 cells) were inoculated onto carrier flakes in BelloCell bottles and treated with MK-4519, a serine protease inhibitor. Our dose-ranging studies illustrated that MK-4519 inhibited replicon replication in a dose-dependent manner, yielding a 50% effective concentration (EC(50)) of 1.8 nM. Dose-fractionation studies showed that shorter dosing intervals resulted in greater replicon suppression, indicating that the time that the concentration is greater than the EC(50) is the pharmacodynamic parameter for MK-4519 linked with inhibition of replicon replication. Mutations associated with resistance to serine protease inhibitors were detected in replicons harvested from all treatment arms. These data suggest that MK-4519 is highly active against genotype 1b HCV, but monotherapy is not sufficient to prevent the amplification of resistant replicons. In summary, our findings show that the BelloCell system is a useful and clinically relevant tool for predicting optimal dosage regimens for anti-HCV compounds.

PMID:
22155837
PMCID:
PMC3294889
DOI:
10.1128/AAC.05383-11
[Indexed for MEDLINE]
Free PMC Article

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