Related Experiment Video

Updated: Aug 8, 2026

In Vitro Analysis of Myd88-mediated Cellular Immune Response to West Nile Virus Mutant Strain Infection
10:39

In Vitro Analysis of Myd88-mediated Cellular Immune Response to West Nile Virus Mutant Strain Infection

Published on: November 27, 2014

Differentially regulated interferon response determines the outcome of Newcastle disease virus infection in normal

Sateesh Krishnamurthy1, Toru Takimoto, Ruth Ann Scroggs

  • 1Department of Infectious Diseases, Mail Stop 330, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105-2794, USA.

Journal of Virology
|May 16, 2006
PubMed

Insights

Newcastle disease virus (NDV) shows different infection patterns in normal versus tumor cells. Tumor cells exhibit a weaker antiviral response to interferon-beta (IFN-beta), enabling rapid NDV spread.

Area of Science:

  • Virology
  • Oncolytic Viruses
  • Immunology

Background:

  • Newcastle disease virus (NDV) is a negative-strand RNA virus with demonstrated oncolytic activity against human tumors.
  • Clinical studies show NDV's effectiveness against tumors and safety in normal tissues.
  • Differences in NDV infection spread and cellular response to interferon-beta (IFN-beta) between normal and tumor cells are observed.

Purpose of the Study:

  • To investigate the differential response of normal and tumor cells to NDV infection and IFN-beta treatment.
  • To compare the IFN signal transduction pathway in normal versus tumor cells.
  • To elucidate the mechanisms behind NDV's differential spread and replication.

Main Methods:

  • Comparative analysis of NDV replication and spread in HT-1080 (tumor) and CCD-1122Sk (normal) cell lines.
  • Assessment of NDV replication inhibition by IFN-beta in both cell types.
  • Analysis of IFN signal transduction pathway components (phosphorylated STAT1/STAT2, ISGF3 complex) via Western blot or similar techniques.
  • Gene expression profiling using cDNA microarrays to compare IFN-regulated genes.

Main Results:

  • NDV replicated rapidly and killed HT-1080 cells, but spread poorly in CCD-1122Sk cells.
  • IFN-beta pretreatment completely inhibited NDV replication in normal cells but had minimal effect on tumor cells.
  • Tumor cells showed reduced levels of phosphorylated STAT1, STAT2, and the ISGF3 complex upon IFN-beta treatment.
  • Fewer IFN-regulated genes were identified in tumor cells compared to normal cells, indicating a deficient antiviral response.

Conclusions:

  • Tumor cells possess a deficient IFN signal transduction pathway, leading to a less-than-optimum antiviral response.
  • The impaired IFN response in tumor cells allows for the rapid spread of NDV.
  • The differential response to IFN-beta is a key factor determining the outcome of NDV infection in normal versus tumor cells.

More Related Videos

Rescue of Recombinant Newcastle Disease Virus from cDNA10:55

Rescue of Recombinant Newcastle Disease Virus from cDNA

Published on: October 11, 2013

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes10:00

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes

Published on: March 24, 2015

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...