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RIPK3: Beyond Necroptosis.

Azia S Evans1, Carolyn B Coyne2

  • 1Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA; Center for Microbial Pathogenesis, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA, USA.

Immunity
|January 17, 2019
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Summary

Researchers found that RIPK3 signaling limits Zika virus (ZIKV) in the brain. This pathway boosts itaconate production in neurons, offering a new way to control ZIKV infection.

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Area of Science:

  • Neuroscience
  • Immunology
  • Virology

Background:

  • Zika virus (ZIKV) poses a significant threat to the central nervous system.
  • The precise mechanisms by which the host immune system controls ZIKV infection in neurons are not fully understood.
  • Receptor-interacting protein kinase 3 (RIPK3) is known to play a role in programmed cell death pathways like necroptosis.

Purpose of the Study:

  • To investigate the role of RIPK3 signaling in controlling ZIKV infection within the central nervous system.
  • To determine if RIPK3's function in ZIKV control is linked to its known role in necroptosis.
  • To identify novel mechanisms of host-directed antiviral defense against ZIKV in neurons.

Main Methods:

  • Utilized mouse models and primary neuronal cultures.
  • Assessed ZIKV replication and neuropathology in the context of RIPK3 signaling.
  • Quantified levels of key metabolites, including itaconate, in infected neurons.
  • Investigated the impact of itaconate on ZIKV replication.

Main Results:

  • RIPK3 signaling was found to limit ZIKV infection in the central nervous system.
  • This antiviral effect was independent of RIPK3's canonical role in necroptosis.
  • RIPK3 signaling was shown to promote the production of the metabolite itaconate in infected neurons.
  • Itaconate production was identified as a key mediator of ZIKV control in neurons.

Conclusions:

  • RIPK3 signaling provides a neuron-specific mechanism for controlling ZIKV infection.
  • The study reveals a novel, necroptosis-independent function of RIPK3 in promoting metabolite production (itaconate) for antiviral defense.
  • This highlights a promising avenue for therapeutic strategies targeting ZIKV-induced neuropathology through metabolic modulation.