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• W1964543542 startingPage "562" @default.
• W1964543542 abstract "Background. Recurrence of hepatitis C virus (HCV) after liver transplantation is almost universal and decreases both graft and patient survival. Medications that alter nucleic acid metabolism, including some common immunosuppressants used in HCV-infected patients, may affect viral replication. Methods. Bovine viral diarrhea virus (BVDV) is in the Flaviviridae family and is closely related to HCV. We measured the effect of two immunosuppressants, azathioprine (AZA) and mycophenolate acid (MPA), on both BVDV replication by plaque assay and host-cell replication by flow cytometry. We also compared the effect of ribavirin and AZA on the level of HCV replicon RNA by real-time reverse-transcriptase polymerase chain reaction. Results. At doses that achieved similar cytotoxicity, AZA decreased BVDV replication 10 times more than MPA. The inhibition of BVDV by AZA occurred at lower doses than the cellular cytotoxicity and did not depend on cytotoxicity. A two-log reduction in viral titers occurred despite blocking the cytotoxicity of AZA by inhibiting ribonucleotide reductase with high concentrations of thymidine. A metabolite of AZA, 6-mercaptopurine, still possessed this antiviral effect, but a metabolite further downstream, 6-thioguanine, did not, even though 6-thioguanine is the metabolite responsible for cellular toxicity. The effect of AZA on a HCV replicon was at least as large as that of ribavirin. Conclusions. This report suggests that AZA is a more potent antiviral than MPA for Flaviviridae and may exert a specific antiviral effect on HCV. Additional clinical studies to investigate this previously unanticipated antiviral effect of AZA on HCV in the posttransplant setting are indicated." @default.
• W1964543542 created "2016-06-24" @default.
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• W1964543542 date "2004-02-01" @default.
• W1964543542 modified "2023-10-14" @default.
• W1964543542 title "EFFECT OF ANTIMETABOLITE IMMUNOSUPPRESSANTS ON FLAVIVIRIDAE, INCLUDING HEPATITIS C VIRUS" @default.
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• W1964543542 doi "https://doi.org/10.1097/01.tp.0000114610.40412.c6" @default.
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