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Defective mitochondrial fission augments NLRP3 inflammasome activation

Sangjun Park1, Ji-Hee Won1, Inhwa Hwang1

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

Scientific Reports
|October 23, 2015
PubMed

Insights

Mitochondrial dynamics regulate NLRP3 inflammasome activation. Aberrant mitochondrial elongation potentiates inflammation, while fission attenuates it, offering new therapeutic targets for chronic inflammatory diseases.

Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • Deregulation of the NLRP3 inflammasome is implicated in chronic inflammatory and metabolic disorders.
  • Mitochondria are recognized as regulators of NLRP3 inflammasome activation, but the role of mitochondrial dynamics is unclear.
  • Understanding the mechanisms controlling NLRP3 inflammasome activation is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the role of mitochondrial dynamics in regulating NLRP3 inflammasome activation.
  • To elucidate the molecular mechanisms linking mitochondrial morphology to inflammasome signaling.
  • To explore the potential of targeting mitochondrial dynamics for controlling aberrant inflammation.

Main Methods:

  • Utilized knockdown of dynamin-related protein 1 (Drp1) to induce mitochondrial elongation in mouse bone marrow-derived macrophages.
  • Employed carbonyl cyanide m-chlorophenyl hydrazone to induce mitochondrial fission.
  • Assessed NLRP3 inflammasome activation, caspase-1 cleavage, and interleukin-1-beta secretion.
  • Investigated the role of extracellular signal-regulated kinase (ERK) signaling.

Main Results:

  • Knockdown of Drp1 led to significant mitochondrial elongation and a marked increase in NLRP3 inflammasome activation, caspase-1 cleavage, and IL-1-beta secretion.
  • Chemical induction of mitochondrial fission attenuated NLRP3 inflammasome assembly and activation.
  • Enhanced ERK signaling in Drp1-knockdown cells was linked to potentiated NLRP3 inflammasome activation, potentially through NLRP3 mitochondrial localization.
  • Increased mitochondrial damage was not the cause of augmented NLRP3 inflammasome activation in Drp1-knockdown cells.

Conclusions:

  • Mitochondrial dynamics, specifically elongation, play a critical role in potentiating NLRP3 inflammasome activation.
  • Aberrant mitochondrial elongation promotes inflammation, while fission attenuates it.
  • ERK signaling may mediate the effects of mitochondrial dynamics on NLRP3 inflammasome assembly and activation.
  • These findings provide molecular insights into the importance of mitochondrial dynamics in NLRP3 inflammasome-driven inflammation.

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