402957-28-2

402957-28-2 structure

Name: Telaprevir (VX-950)
Chemical Name: telaprevir
CAS Number: 402957-28-2
Molecular Formula: C₃₆H₅₃N₇O₆
Molecular Weight: 679.849
Catalog: Biochemical Inhibitor Proteases HCV Protease Inhibitor
Create Date: 2018-02-14 08:00:00
Modify Date: 2024-01-04 08:42:42
Telaprevir is a highly selective, reversible, and potent peptidomimetic inhibitor of the HCV NS3-4A protease, the steady-state inhibitory constant (Ki) of Telaprevir is 7 nM against a genotype 1 (H strain) NS3 protease domain plus a NS4A cofactor peptide.

Name	telaprevir
Synonyms	Incivek Telaprevir VX-950 Incivo

Description	Telaprevir is a highly selective, reversible, and potent peptidomimetic inhibitor of the HCV NS3-4A protease, the steady-state inhibitory constant (Ki) of Telaprevir is 7 nM against a genotype 1 (H strain) NS3 protease domain plus a NS4A cofactor peptide.
Related Catalog	Signaling Pathways >> Metabolic Enzyme/Protease >> HCV Protease Signaling Pathways >> Anti-infection >> HCV Research Areas >> Infection
Target	Ki: 7 nM (genotype 1 HCV NS3-4A protease)[1]
In Vitro	Telaprevir (VX-950) is a covalent, reversible inhibitor of the NS3-4A protease with a slow-binding and slow-dissociation mechanism. Telaprevir exhibits significantly different kinetics in enzyme inhibition, which is most clearly exemplified by a very long half-life (58 min) of the bound enzyme-inhibitor complex. Telaprevir is additive to moderately synergistic with IFN-α in inhibiting HCV replication and in suppressing the emergence of resistance in replicon cells. Telaprevir reduces HCV RNA levels in a time- and dose-dependent manner. The IC50s following a 24, 48, 72, and 120 h incubation with Telaprevir are determined to be 0.574, 0.488, 0.21, and 0.139 μM, respectively, indicating an increase in inhibitory effects with time. Following three independent experiments using the 48 h incubation in the presence of 2% FBS, the average IC50 of Telaprevir is determined to be 0.354 ± 0.035 μM, and the average IC90 is 0.830 ± 0.190 μM[1]. Telaprevir (VX-950) is a potent, selective, peptidomimetic inhibitor of the hepatitis C virus (HCV) NS3-4A serine protease, and Telaprevir demonstrates excellent antiviral activity both in genotype 1b HCV replicon cells (IC50=354 nM) and in human fetal hepatocytes infected with genotype 1a HCV-positive patient sera (IC50=280 nM)[2].
In Vivo	There is an ~5-fold reduction of serum SEAP activity in mice dosed with Telaprevir (VX-950) at either 10 or 25 mg/kg, which has an average value (±SEM) of 18.7±8.3% or 18.4±5.4%, respectively, compare to those administered vehicle (100±28%). These data demonstrates that Telaprevir is able to inhibit the HCV NS3-4A serine protease activity in mouse liver and block cleavage and subsequent secretion of SEAP into blood circulation in these mice[2].
Cell Assay	Determination of IC50, IC90, CC50 of Telaprevir (VX-950) or IFN-α in HCV replicon cells is performed. Briefly, 1×104 replicon cells per well are plated in 96-well plates. On the following day, replicon cells is incubated at 37°C for the indicated period of time with antiviral agents serially diluted in DMEM plus 2% FBS and 0.5% DMSO. Total cellular RNA is extracted using an RNeasy-96 kit, and the copy number of HCV RNA is determined using a quantitative RT-PCR (QRT-PCR) assay. Each datum point represents the average of five replicates in cell culture. The cytotoxicity of Telaprevir is measured under the same experimental settings using a tetrazolium (MTS)-based cell viability assay. For the cytotoxicity assay with human hepatocyte cell lines, 1×104 parental Huh-7 cells per well or 4×104 HepG2 cells per well are used. To determine cytotoxicity of Telaprevir against resting PBMC, 1×105 cells per well are incubated with Telaprevir in RPMI-1640 medium (no serum) for 48 h, and the cell viability is determined by the MTS-based assay. To determine cytotoxicity of VX-950 against proliferating PBMC, 1×105 cells per well in RPMI-1640 medium are added to a 96-well plate, which is precoated with anti-human CD3 antibody. The cells are incubated with Telaprevir and anti-human CD28 antibody for 72 h at 37°C, and the cell growth is determined by [3H]thymidine update between the 48th and 72nd h[1].
Animal Admin	Mice[2] Five groups of 6-week-old SCID mice (6 animals per group) are injected with 109 IFU per mouse of recombinant adenovirus Ad-WT-HCVpro-SEAP through the tail vein. Each group of mice is given two oral administrations of Telaprevir (VX-950) at one of the following doses: 10, 25, 75, 150, or 300 mg/kg. The first Telaprevir dose is given 2 h before the adenovirus injection, and the second dose is given 10 h after injection. An additional group of 10 mice is given vehicle alone. Serum samples are collected 24 h postinjection, and the SEAP activity in each Telaprevir-dosed group is compared to that of the vehicle group. Rat and Dog[2] The intravenous and oral pharmacokinetics of Telaprevir (VX-950) are evaluated in rats and dogs. A group of 3 male Sprague-Dawley rats weighing 250 to 300 g is administered an intravenous bolus dose of 0.95 mg/kg Telaprevir. Serial blood samples are collected in heparinized tubes before dosing and at 0.083, 0.167, 0.25, 0.5, 1, 1.5, 2, 3, 4, 6, and 8 h after dose administration. A group of 3 male beagle dogs (8 to 12 kg) is administered an intravenous bolus dose of 3.5 mg/kg Telaprevir in 10% ethanol, 40% polyethylene glycol 400, and 50% D5W. Serial blood samples are collected in heparinized tubes before dosing and at 0.083, 0.167, 0.25, 0.5, 1, 1.5, 2, 4, 6, 8, 12, and 24 h after dose administration. For oral studies in rats and dogs, Telaprevir is formulated in polyvinylpyrrolidone (PVP) K-30 plus 2% sodium lauryl sulfate and then dosed as an oral gavage. A group of 3 male Sprague-Dawley rats (250 to 300 g) is dosed orally with 40 mg/kg VX-950, and a group of 4 male beagle dogs (10.9 to 12.0 kg) is administered an oral dose of 9.6 mg/kg VX-950. In both oral studies, blood samples are taken before dosing and at 0.25, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12, and 24 h after dose administration. In both intravenous and oral studies, plasma samples are obtained by centrifugation and stored at −70°C until analysis. Samples from the intravenous studies are analyzed by a chiral liquid chromatography followed by tandem mass spectrometry (LC/MS/MS) method, and samples from the oral studies are analyzed using an achiral LC/MS/MS method.
References	[1]. Lin K, et al. VX-950, a novel hepatitis C virus (HCV) NS3-4A protease inhibitor, exhibits potent antiviral activities in HCv replicon cells. Antimicrob Agents Chemother. 2006 May;50(5):1813-22. [2]. Perni RB, et al. Preclinical profile of VX-950, a potent, selective, and orally bioavailable inhibitor of hepatitis C virus NS3-4A serine protease. Antimicrob Agents Chemother. 2006 Mar;50(3):899-909. [3]. Zhang X, et al. Discovery and evolution of aloperine derivatives as a new family of HCV inhibitors with novel mechanism. Eur J Med Chem. 2018 Jan 1;143:1053-1065.

Density	1.3±0.1 g/cm3
Molecular Formula	C₃₆H₅₃N₇O₆
Molecular Weight	679.849
Exact Mass	679.405762
PSA	179.56000
LogP	3.93
Index of Refraction	1.584
Storage condition	2~8°C

Hazard Codes	Xi
Safety Phrases	24/25

Precursor 9
1257874-86-4 402958-96-7 402958-25-2 98-97-5
22724-81-8 145618-11-7 848777-30-0 848777-29-7
402958-95-6
DownStream 0

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1158522-08-7	940364-43-2
134104-43-1	131615-57-1
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1250978-93-8	1018584-77-4