Lomibuvir (VX-222)

Catalog No.S1480 Synonyms: VCH-222

For research use only.

Lomibuvir (VX-222, VCH-222) is a novel, potent and selective inhibitor of HCV polymerase with IC50 of 0.94-1.2 μM, 15.3-fold less effective for mutant M423T, and 108-fold less effective for mutant I482L. Phase 2.

Lomibuvir (VX-222) Chemical Structure

CAS No. 1026785-59-0

Selleck's Lomibuvir (VX-222) has been cited by 17 publications

Purity & Quality Control

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Biological Activity

Description Lomibuvir (VX-222, VCH-222) is a novel, potent and selective inhibitor of HCV polymerase with IC50 of 0.94-1.2 μM, 15.3-fold less effective for mutant M423T, and 108-fold less effective for mutant I482L. Phase 2.
Features A novel, potent and selective inhibitor of non-nucleoside polymerase, specifically the HCV RNA-dependent RNA polymerase.
HCV NS5B 1a [1] HCV NS5B 1b [1]
0.94 μM 1.2 μM
In vitro

VX-222 binds to the thumb II allosteric pocket of the HCV RNA-dependent RNA polymerase. VX-222 exhibits non-competitive and selective inhibition in HCV NS5B of genotype 1a and 1b, with IC50 of 0.94 and 1.2 μM, respectively. VX-222 selectively inhibits the replication of subgenomic HCV genotype 1a and 1b with an EC50 of 22.3 and 11.2 nM, respectively. [1] Similarly, a recent study shows that VX-222 inhibits the 1b/Con1 HCV subgenomic replicon, with an EC50 of 5 nM. VX-222 preferentially inhibits primer-dependent RNA synthesis, showing only a modest or no effect on de novo-initiated RNA synthesis. [2]

In vivo In rats and dogs, VCH-222 displays fine pharmacokinetic profile, including low total body clearance and excellent oral bioavailability (greater than 30%) and good ADME properties. VCH-222 is biotransformed by several enzymes (CYP1A1, 2A6, 2B6, 2C8, CYP 3A4, UGT1A3) and is predicted to be actively transported in liver and excreted mainly intact in bile or as glucuronide adducts. [3]

Protocol (from reference)

Kinase Assay:[1]
  • Anti-NS5B activity assay:

    The inhibitory effect of VX-222 on HCV NS5B activity is measured by evaluating the amount of radiolabeled UTP incorporated by the C-terminal ∆21 truncated version of enzyme in a newly synthesized RNA using a homopolymeric RNA template / primer namely poly rA / oligo dT. Quantitative detection of incorporated radioactivity is done using a liquid scintillation counter. The in vitro kinetics of inhibition of HCV NS5B from genotype 1b strain BK by VX-222 are determined using the C-terminal ∆21 truncated version of NS5B. VX-222 (1 to 1.5 μM) is tested in the presence of 10 to 75 μM nonradioactive UTP mixed with 0.89 to 6.70 μCi of [α-33P]-labeled UTP. RNA-dependent-RNA polymerase reactions are allowed to proceed for 18 min at 22 °C.

Cell Research:[2]
  • Cell lines: Huh7.5 cells
  • Concentrations: 0.01 nM -10 μM
  • Incubation Time: 48 hours
  • Method: Huh7.5 cells harboring HCV RNA replicons are trypsinized and plated into 48-well plates at a concentration of 4 × 104 cells/well. The next day the medium is changed and VX-222 is added in 200 μL of complete medium. After 48 hours, total RNA is extracted and viral RNAs are quantified by real-time reverse transcription-PCR (RT-PCR). The effective drug concentrations that reduced HCV RNA replicon levels by 50% (EC50) are calculated by nonlinear regression analysis with log curve fitting.
Animal Research:[3]
  • Animal Models: Rats or dogs
  • Dosages: 5 mg/kg for rats or 10 mg/kg for dogs
  • Administration: By oral gavage

Solubility (25°C)

In vitro

In vivo

Add solvents to the product individually and in order
(Data is from Selleck tests instead of citations):
30% PEG400+0.5% Tween80+5% propylene glycol
For best results, use promptly after mixing.

30 mg/mL

Chemical Information

Molecular Weight 445.61


CAS No. 1026785-59-0
Storage 3 years -20°C powder
2 years -80°C in solvent
Smiles CC1CCC(CC1)C(=O)N(C2CCC(CC2)O)C3=C(SC(=C3)C#CC(C)(C)C)C(=O)O

In vivo Formulation Calculator (Clear solution)

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Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
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Molarity Calculator

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Clinical Trial Information

NCT Number Recruitment Interventions Conditions Sponsor/Collaborators Start Date Phases
NCT00958152 Completed Drug: VCH-222|Drug: telaprevir Hepatitis C Vertex Pharmaceuticals Incorporated August 2009 Phase 1

(data from https://clinicaltrials.gov, updated on 2022-11-29)

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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