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Transcription Factor JunB Suppresses Hepatitis C Virus Replication.

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Hepatitis C virus (HCV) infection activates the ROS/JNK pathway, leading to JunB phosphorylation. JunB inhibits HCV replication and contributes to iron metabolism disorders, revealing a new therapeutic target for HCV.

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Area of Science:

  • Hepatology
  • Virology
  • Molecular Biology

Background:

  • Hepatitis C virus (HCV) infection activates the reactive oxygen species (ROS)/c-Jun N-terminal kinase (JNK) signaling pathway.
  • JNK activation is implicated in liver diseases, including metabolic disorders, steatosis, liver cirrhosis, and hepatocellular carcinoma.
  • The role of JunB, a JNK target gene, in HCV infection and pathogenesis is unclear.

Purpose of the Study:

  • To investigate the role of JunB phosphorylation in HCV infection.
  • To clarify the physiological role of JunB in the HCV life cycle and associated pathogenesis.

Main Methods:

  • HCV J6/JFH1 infection of Huh-7.5 cells.
  • Immunoblot analysis to detect JunB phosphorylation.
  • Small interfering RNA (siRNA) knockdown and overexpression of JunB.
  • Quantification of intracellular and extracellular HCV RNA and infectivity titers.
  • Analysis of hepcidin promoter activity and mRNA levels.

Main Results:

  • HCV-induced ROS/JNK activation promoted JunB phosphorylation.
  • JunB knockdown increased intracellular HCV RNA and infectivity.
  • JunB overexpression reduced intracellular HCV RNA and infectivity.
  • JunB activation promoted hepcidin promoter activity and mRNA levels.

Conclusions:

  • JunB inhibits HCV propagation.
  • The HCV-induced ROS/JNK/JunB signaling pathway plays a role in inhibiting HCV replication.
  • JunB is involved in HCV-mediated iron metabolism disorder through hepcidin upregulation.