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The adaptor MAVS promotes NLRP3 mitochondrial localization and inflammasome activation

Naeha Subramanian1, Kannan Natarajan, Menna R Clatworthy

  • 1Lymphocyte Biology Section, Laboratory of Systems Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. subramaniann@niaid.nih.gov

Cell
|April 16, 2013
PubMed

Insights

Mitochondria-associated molecule MAVS is crucial for NLRP3 inflammasome activation, enhancing IL-1β production. This reveals MAVS

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The NLRP3 inflammasome, a protein complex, drives IL-1β production via caspase-1.
  • The adaptor ASC is essential for NLRP3 inflammasome function.
  • The precise location (cytosol vs. mitochondria) and adapter sufficiency for inflammasome assembly remain debated.

Purpose of the Study:

  • To investigate the role of mitochondria-associated adaptor molecule MAVS in NLRP3 inflammasome activation.
  • To determine if MAVS is required for optimal NLRP3 inflammasome activity and IL-1β production.
  • To explore the implications of MAVS involvement in NLRP3 inflammasome assembly.

Main Methods:

  • Investigated MAVS's role in NLRP3 inflammasome assembly and activity.
  • Assessed IL-1β production and pathophysiological outcomes in vivo.
  • Examined the recruitment of NLRP3 to mitochondria mediated by MAVS.

Main Results:

  • MAVS is essential for optimal NLRP3 inflammasome activity.
  • MAVS mediates the recruitment of NLRP3 to mitochondria.
  • MAVS promotes IL-1β production and the in vivo pathophysiological activity of the NLRP3 inflammasome.

Conclusions:

  • NLRP3 inflammasome activation is more complex, requiring at least two adapters for maximal function.
  • MAVS, previously linked solely to type 1 interferon production, plays a significant role in NLRP3 inflammasome signaling.
  • These findings highlight unexpected, broader roles for PYD/CARD-domain adapters in innate immunity.

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