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Related Concept Videos

Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...

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Pegylated interferon-α2b and ribavirin decrease claudin-1 and E-cadherin expression in HepG2 and Huh-7.5 cells.

Erika P Rendón-Huerta1, Ana Torres-Martínez, Claudia Charles-Niño

  • 1Departamento de Biología Celular y Tisular, Facultad de Medicina, UNAM, México, D.F. 04510, México. erendon@bq.unam.mx

Annals of Hepatology
|July 2, 2013
PubMed
Summary
This summary is machine-generated.

Pegylated interferon-alfa (PEG-IFN) plus ribavirin (RBV) treatment for Hepatitis C virus (HCV) infection may improve efficacy by reducing claudin-1 and E-cadherin expression in liver cells. This study investigated the impact of PEG-IFN plus RBV on claudin expression in HCV.

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Area of Science:

  • Hepatology
  • Virology
  • Cell Biology

Background:

  • Hepatitis C virus (HCV) infection leads to persistent viremia.
  • HCV entry into hepatocytes requires claudin-1, -6, -9, and occludin.
  • Combination therapy of Pegylated interferon-alfa (PEG-IFN) and ribavirin (RBV) enhances treatment efficacy.

Purpose of the Study:

  • To investigate whether PEG-IFN plus RBV combination therapy regulates claudin expression in liver cells.
  • To determine the effect of PEG-IFN and RBV on the expression of tight junction proteins involved in HCV entry.

Main Methods:

  • HepG2, Huh-7, and Huh-7.5 cells were treated with PEG-IFN-α2a or α2b and/or RBV.
  • Claudin-1, -3, -4, -6, -9, E-cadherin, and occludin expression was analyzed via Western blot.
  • Transepithelial electrical resistance (TER) was measured to assess cell barrier function.

Main Results:

  • Claudin-1 and E-cadherin expression in the cell membrane decreased following treatment with PEG-IFNα2b plus RBV, with maximal effect at higher concentrations.
  • The inhibitory effect was more pronounced with PEG-IFNα2b compared to PEG-IFNα2a.
  • No significant change in claudin-1 mRNA levels was observed, suggesting post-transcriptional regulation.

Conclusions:

  • The enhanced therapeutic efficacy of PEG-IFNα2b plus RBV may be linked to the downregulation of claudin-1 and E-cadherin at the cell membrane.
  • These findings suggest a potential mechanism for improved HCV treatment outcomes involving modulation of host cell entry factors.