Hepatitis C Viral Dynamics in Vivo and the Antiviral Efficacy of Interferon-α Therapy

TLDR

The study aims to understand hepatitis C virus dynamics and the antiviral effect of interferon‑α‑2b by analyzing viral decline in 23 patients. The authors used a mathematical model to analyze viral decline during interferon‑α‑2b therapy. The model shows that interferon‑α‑2b primarily blocks virion production or release (81–96 % efficacy at 5–15 MIU), with a mean virion half‑life of 2.7 h and highly variable infected‑cell death rates that correlate with baseline viral load and ALT, and that rapid cell death predicts viral clearance by 3 months, underscoring the dynamic nature of HCV infection and the value of early viral load monitoring.

Abstract

To better understand the dynamics of hepatitis C virus and the antiviral effect of interferon-α-2b (IFN), viral decline in 23 patients during therapy was analyzed with a mathematical model. The analysis indicates that the major initial effect of IFN is to block virion production or release, with blocking efficacies of 81, 95, and 96% for daily doses of 5, 10, and 15 million international units, respectively. The estimated virion half-life ( t 1/2 ) was, on average, 2.7 hours, with pretreatment production and clearance of 10 12 virions per day. The estimated infected cell death rate exhibited large interpatient variation (corresponding t 1/2 = 1.7 to 70 days), was inversely correlated with baseline viral load, and was positively correlated with alanine aminotransferase levels. Fast death rates were predictive of virus being undetectable by polymerase chain reaction at 3 months. These findings show that infection with hepatitis C virus is highly dynamic and that early monitoring of viral load can help guide therapy.