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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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Two Methods of Heterokaryon Formation to Discover HCV Restriction Factors
16:49

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Published on: July 16, 2012

Isolation and characterization of interferon lambda-resistant hepatitis C virus replicon cell lines.

Jacques Friborg1, Baiqing Lin, Chaoqun Chen

  • 1Discovery Virology, Bristol-Myers Squibb Research and Development, Wallingford, CT 06492, USA. jacques.friborg@bms.com

Virology
|July 30, 2013
PubMed
Summary

Investigating non-response to pegylated interferon lambda-1a (Lambda) for hepatitis C virus (HCV), this study identified defects in the JAK-STAT pathway in resistant HCV cells. This explains reduced antiviral responses to interferon lambda-1.

Keywords:
HCVInterferonLambdaResistance

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Area of Science:

  • Hepatology
  • Virology
  • Immunology

Background:

  • Pegylated interferon lambda-1a (Lambda) is under development for chronic hepatitis C virus (HCV) infection.
  • Understanding non-responsiveness mechanisms is crucial for optimizing Lambda therapy.

Purpose of the Study:

  • To investigate molecular mechanisms of non-responsiveness to interferon lambda-1 (IFNλ) in HCV.
  • To characterize HCV subgenomic replicon cell-lines with impaired susceptibility to recombinant IFNλ (rIFNλ).

Main Methods:

  • Isolation and characterization of HCV subgenomic replicon cell-lines resistant to rIFNλ.
  • Analysis of the interferon-dependent JAK-STAT signaling pathway activation.
  • Assessment of STAT protein phosphorylation and expression of Jak1 and Tyk2 kinases.

Main Results:

  • Selected replicon cell populations exhibited impaired JAK-STAT signaling pathway activation.
  • Reduced phosphorylation of STAT proteins was observed in resistant cells.
  • Lower expression levels of cellular janus kinases Jak1 and Tyk2 were detected.

Conclusions:

  • Defects in JAK-STAT signaling, specifically reduced STAT phosphorylation and lower Jak1/Tyk2 expression, contribute to HCV resistance to rIFNλ.
  • These findings provide in vitro insights into viral evasion mechanisms against rIFNλ.
  • This research aids in understanding non-responsiveness to interferon lambda-based therapies for HCV.