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Updated: May 7, 2026

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
09:04

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells

Published on: May 22, 2014

The mitochondrial antiviral protein MAVS associates with NLRP3 and regulates its inflammasome activity

Sangjun Park1, Christine Juliana, Sujeong Hong

  • 1Department of Microbiology, Brain Korea 21 Project for Medical Science, Institute for Immunology and Immunological Diseases, Yonsei University College of Medicine, Seoul 120-752, Korea.

Journal of Immunology (Baltimore, Md. : 1950)
|September 20, 2013
PubMed

Insights

The mitochondrial antiviral signaling protein MAVS binds NLRP3, promoting inflammasome activation. MAVS localization to mitochondria is crucial for NLRP3 inflammasome assembly and caspase-1 activation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The NLRP3 inflammasome is a key immune sensor activated by danger signals.
  • Mitochondria and reactive oxygen species are implicated in NLRP3 inflammasome activation.
  • The precise mechanism of NLRP3 activation by diverse stimuli remains incompletely understood.

Purpose of the Study:

  • To investigate the role of the mitochondrial antiviral signaling protein MAVS in NLRP3 inflammasome activation.
  • To determine if MAVS interacts with NLRP3 and influences its oligomerization and activation.
  • To elucidate the contribution of MAVS mitochondrial localization to NLRP3 inflammasome function.

Main Methods:

  • Reconstituted 293T cell system to study MAVS-NLRP3 interactions.
  • Utilized full-length MAVS and a transmembrane domain-truncated mutant (MAVS-ΔTM).
  • Employing Sendai virus infection and MAVS knockdown in THP-1 cells and mouse macrophages.

Main Results:

  • Full-length MAVS, but not MAVS-ΔTM, promoted NLRP3-dependent caspase-1 activation in reconstituted cells.
  • MAVS directly interacted with NLRP3, inducing its oligomerization, dependent on MAVS mitochondrial localization.
  • Sendai virus infection enhanced MAVS-mediated NLRP3 activation, while MAVS knockdown attenuated this response.

Conclusions:

  • MAVS associates with NLRP3, facilitating its recruitment to mitochondria and promoting inflammasome activation.
  • Intact MAVS signaling and mitochondrial localization are essential for NLRP3 inflammasome assembly and caspase-1 activation.
  • MAVS may enhance NLRP3 activation by positioning it near mitochondrial reactive oxygen species.

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