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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
08:32

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

Published on: March 2, 2014

Subversion of the innate immune system by a retrovirus

Brooke A Jude1, Yelena Pobezinskaya, Jennifer Bishop

  • 1The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine 04609, USA.

Nature Immunology
|May 6, 2003
PubMed

Insights

Mouse mammary tumor virus (MMTV) persistence depends on Toll-like receptor-4 (TLR4) signaling. This innate immune pathway promotes MMTV survival by inducing interleukin-10, while its absence selects for immune escape variants.

Area of Science:

  • Virology
  • Immunology
  • Retroviral evolution

Background:

  • Retroviruses, such as mouse mammary tumor virus (MMTV), exhibit rapid evolution to evade host immune responses.
  • Understanding the interplay between retroviruses and the host immune system is crucial for developing effective therapeutic strategies.

Purpose of the Study:

  • To investigate the mechanisms underlying the persistence and elimination of wild-type MMTV in different mouse strains.
  • To elucidate the role of Toll-like receptor-4 (TLR4) signaling in MMTV maintenance and the selection of immune escape variants.

Main Methods:

  • Comparative analysis of MMTV persistence in C3H/HeN and C3H/HeJ mice.
  • Assessment of Toll-like receptor-4 (TLR4) signaling pathways and cytokine production (interleukin-10).
  • Identification of viral recombinants and evaluation of immune responses.

Main Results:

  • Wild-type MMTV persisted indefinitely in C3H/HeN mice but was rapidly lost in C3H/HeJ mice.
  • MMTV maintenance in C3H/HeN mice was dependent on Toll-like receptor-4 (TLR4) signaling, which induced interleukin-10 production.
  • In C3H/HeJ mice with mutant TLR4, wild-type MMTV was cleared by cytotoxic immune responses, favoring the selection of recombinant, immune-escaped MMTV variants.

Conclusions:

  • Subversion of the innate immune system, specifically via TLR4-mediated signaling, is a critical survival strategy for retroviruses like MMTV.
  • The host's innate immune status significantly influences retroviral persistence and drives the evolution of immune escape mechanisms.

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