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The innate immune receptor MDA5 limits rotavirus infection but promotes cell death and pancreatic inflammation

Yu Dou1,2, Howard Ch Yim1,3, Carl D Kirkwood4,5

  • 1Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, Vic., Australia.

The EMBO Journal
|August 31, 2017
PubMed

Insights

Melanoma differentiation-associated protein 5 (MDA5) is vital for fighting rotavirus, a potential type 1 diabetes trigger. Variants linked to lower type 1 diabetes risk show weaker antiviral activity, impacting pancreatic immunity.

Area of Science:

  • Immunology
  • Virology
  • Endocrinology

Background:

  • Melanoma differentiation-associated protein 5 (MDA5) is a key mediator of the innate immune response against viral infections.
  • Polymorphisms in the IFIH1 gene, which encodes MDA5, are associated with altered risk for type 1 diabetes (T1D).

Purpose of the Study:

  • To investigate the role of MDA5 in the immune response to enteric rotavirus infection, a suspected etiological factor in T1D.
  • To determine if MDA5 variants associated with lower T1D risk have altered activity against rotavirus.

Main Methods:

  • Analysis of MDA5 activity in response to rotavirus infection.
  • Assessment of MDA5-dependent induction of interferons, cytokines, and cell death.
  • Examination of the pancreatic immune response in rotavirus-infected mouse models.

Main Results:

  • MDA5 is essential for controlling rotavirus infection through interferon and cytokine induction, as well as promoting cell death.
  • Specific MDA5 variants linked to reduced T1D risk exhibit diminished antiviral activity against rotavirus.
  • The MDA5-mediated antiviral response in the pancreas of infected mice mirrors autoimmune processes seen in T1D.

Conclusions:

  • MDA5 plays a critical role in the antiviral defense against rotavirus, with variants influencing T1D susceptibility.
  • MDA5-induced pancreatic inflammation and cell death may contribute to the autoimmune destruction of pancreatic β-cells in type 1 diabetes.
Keywords:
MDA5inflammationinnate immunityinterferonstype 1 diabetes

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