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Multiple cyclophilins involved in different cellular pathways mediate HCV replication

L Alex Gaither1, Jason Borawski, Leah J Anderson

  • 1Novartis Institutes of Biomedical Research, Cambridge, MA 02139, USA.

Virology
|November 26, 2009
PubMed

Insights

Hepatitis C drug NIM811 inhibits viral replication by targeting multiple cyclophilins and cellular pathways, particularly protein trafficking. Further research is needed to fully understand its mechanism of action.

Area of Science:

  • Virology
  • Molecular Biology
  • Drug Discovery

Background:

  • Cyclophilin inhibitors like DEBIO-025, SCY635, and NIM811 are in clinical trials for hepatitis C.
  • The precise mechanism of action for these cyclophilin inhibitors is not fully elucidated.
  • Human cells express at least 16 cyclophilins involved in various cellular functions.

Purpose of the Study:

  • To identify specific cyclophilins crucial for hepatitis C virus (HCV) replication.
  • To elucidate the mechanism of action of NIM811 in inhibiting HCV.
  • To investigate the cellular pathways affected by NIM811.

Main Methods:

  • Large-scale siRNA screening to identify essential cyclophilins.
  • Chemoproteomic assays using cyclophilin-binding compounds.
  • mRNA profiling of cells containing HCV replicons.

Main Results:

  • Confirmed the role of cyclophilin A in HCV replication.
  • Identified additional cyclophilin-containing pathways involved in HCV.
  • NIM811 demonstrated inhibition of multiple cyclophilins and pathways.
  • Protein trafficking was identified as the most significantly impacted pathway by NIM811.

Conclusions:

  • NIM811 exerts its antiviral effect by inhibiting multiple cyclophilins.
  • The inhibition of protein trafficking is a key mechanism by which NIM811 reduces HCV replication.
  • These findings contribute to understanding cyclophilin inhibitor mechanisms for hepatitis C therapy.

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