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Related Experiment Videos

Morphine withdrawal enhances hepatitis C virus replicon expression.

Chuan-Qing Wang1, Yuan Li, Steven D Douglas

  • 1Department of Pediatrics, Division of Allergy and Immunology, The Children's Hospital of Philadelphia, and the Department of Psychiatry, University of Pennsylvania School of Medicine, 34th St. and Civic Center Blvd., Philadelphia, PA 19104, USA.

The American Journal of Pathology
|October 28, 2005
PubMed
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Morphine withdrawal and precipitated withdrawal increase hepatitis C virus (HCV) replication in liver cells by suppressing interferon-alpha (IFN-alpha) and innate immunity, promoting viral persistence.

Area of Science:

  • Hepatology
  • Virology
  • Immunology

Background:

  • Morphine is known to enhance hepatitis C virus (HCV) replication in human hepatic cells.
  • Opioid abuse often involves recurrent morphine withdrawal (MW).

Purpose of the Study:

  • To investigate the impact of morphine withdrawal (MW) and precipitated withdrawal (PW) on HCV replication.
  • To elucidate the underlying mechanisms of MW/PW-mediated HCV enhancement, focusing on interferon-alpha (IFN-alpha) signaling.

Main Methods:

  • HCV replicon expression was measured in human hepatic cells following MW and PW.
  • Interferon-alpha (IFN-alpha) expression, promoter activation, and IRF-7 levels were assessed.
  • The anti-HCV activity of recombinant IFN-alpha was evaluated after MW/PW.

Related Experiment Videos

Main Results:

  • Both MW and PW significantly enhanced HCV RNA and protein expression.
  • MW and PW suppressed endogenous IFN-alpha expression by inhibiting its promoter activation and IRF-7 levels.
  • MW and PW reduced the efficacy of recombinant IFN-alpha against HCV.

Conclusions:

  • Morphine withdrawal and precipitated withdrawal enhance HCV replication in hepatic cells.
  • This enhancement is mediated by the suppression of IFN-alpha-driven innate immunity.
  • Opioid abuse may favor HCV persistence by disrupting intracellular antiviral defenses.