Danoprevir is a NS3/4A protease inhibitor for hepatitis C virus (HCV) with IC50 of 0.2-3.5 nM. The inhibition effect on HCV genotypes 1A/1B/4/5/6 is approximately 10-fold higher than 2B/3A.
Description :
A potent, highly selective, orally available, peptidomimetic HCV NS3/4A protease inhibitor with IC50 of 0.2-0.4 nM (GT1a, 1b, 4, 5 and 6), 1.6 nM (GT2b); shows favorable potency profile against multiple HCV genotypes 1–6 and key mutants (replicon GT1b, EC50=1.6 nM).
HCV Infection
Danoprevir (0.29 nM) inhibits the reference genotype 1 NS3/4A protease half-maximally, but a high dose of Danoprevir (10 μM) shows no appreciably inhibition in a panel of 79 proteases, ion channels, transporters, and cell surface receptors. Danoprevir remains bound to and inhibits NS3/4A for more than 5 hours after its initial association. Danoprevir (45 nM) eliminates a patient-derived HCV genotype 1b replicon from hepatocyte-derived Huh7 cells with an EC50 of 1.8 nM. [1] In HCV subgenomic replicon cell lines containing the individual mutations, V36M, R109K, and V170A substitutions confer little or no resistance to Danoprevir, but the R155K substitution confers a high level (62-fold increase) of resistance to Danoprevir. [2] In Huh7.5 cells transfected with chimeric recombinant virus, Danoprevir shows antiviral inhibition effects against HCV genotypes 1, 4 and 6 with IC50 of 2-3 nM, which are >100-fold lower than genotypes 2/3/5 (280-750 nM). [3]
Danoprevir (30 mg/kg, p.o.) administered to rats or monkeys shows that its concentrations in liver 12 hours after dosing exceed the Danoprevir concentration required to eliminate replicon RNA from cells[2].