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MDA5 and MAVS mediate type I interferon responses to coxsackie B virus

Jennifer P Wang1, Anna Cerny, Damon R Asher

  • 1Department of Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA. Jennifer.wang@umassmed.edu

Journal of Virology
|October 23, 2009
PubMed

Insights

MDA5 and MAVS are crucial for type I interferon production against Coxsackie B virus (CVB) infection. Their absence in mice led to reduced interferon, increased mortality, and organ damage, highlighting interferon

Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • Coxsackie B viruses (CVB) are enteroviruses linked to various human diseases, notably myocarditis.
  • Innate immune responses are vital for controlling viral infections.

Purpose of the Study:

  • To investigate the roles of MDA5 and MAVS in type I interferon responses to CVB infection.
  • To elucidate the mechanisms of innate immunity during coxsackievirus infection.

Main Methods:

  • Utilized MAVS and MDA5 knockout mouse models.
  • Infected mice with CVB and assessed survival rates.
  • Performed histopathological examinations of infected organs.
  • Measured type I interferon and inflammatory cytokine production.
  • Quantified viral titers in infected mice.

Main Results:

  • Absence of MAVS or MDA5 resulted in deficient type I interferon production and early mortality in CVB-infected mice.
  • Pancreatic and hepatic necrosis were observed in knockout mice.
  • Inflammatory cytokine production was independent of MAVS.
  • Virus titers were not elevated in MAVS-deficient mice despite reduced type I interferon levels.

Conclusions:

  • MDA5 and MAVS are critical for type I interferon responses to CVB.
  • Type I interferon plays a significant role in host defense against CVB infection.
  • These findings provide insights into innate immune mechanisms against coxsackievirus.

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