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A Protocol for Analyzing Hepatitis C Virus Replication
13:04

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Published on: June 26, 2014

HIV increases HCV replication in a TGF-beta1-dependent manner.

Wenyu Lin1, Ethan M Weinberg, Andrew W Tai

  • 1Gastrointestinal Unit, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.

Gastroenterology
|March 8, 2008
PubMed
Summary

Human immunodeficiency virus (HIV) accelerates hepatitis C virus (HCV) replication and liver disease progression. HIV proteins like gp120 enhance HCV replication via TGF-beta1, contributing to hepatic fibrosis.

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Area of Science:

  • Virology
  • Hepatology
  • Immunology

Background:

  • Hepatitis C virus (HCV) coinfection with human immunodeficiency virus (HIV) worsens liver disease progression and reduces treatment efficacy.
  • The mechanism by which HIV, a non-liver-targeting virus, accelerates HCV-related liver disease remains unclear.

Purpose of the Study:

  • To investigate how circulating HIV and its proteins contribute to HCV pathogenesis.
  • To determine if HIV proteins engage extracellular coreceptors on hepatocytes to influence HCV.

Main Methods:

  • Utilized HCV replicon and infectious models.
  • Assessed the impact of inactivated HIV and gp120 on HCV replication.
  • Investigated the role of transforming growth factor (TGF)-beta1 and coreceptors (CCR5, CXCR4) in HIV-HCV interactions.

Main Results:

  • Inactivated HIV and gp120 significantly increased HCV replication and TGF-beta1 expression.
  • Antibodies against CCR5 or CXCR4 neutralized the proviral effect of HIV and gp120.
  • HIV and gp120 did not affect type I interferon signaling; the effect was TGF-beta1 dependent.
  • Human TGF-beta1 also enhanced HCV replication.

Conclusions:

  • HIV enhances HCV replication through a TGF-beta1-dependent mechanism involving CCR5/CXCR4 coreceptors.
  • This suggests a novel pathway for HIV-mediated acceleration of HCV replication and hepatic fibrosis progression.