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Updated: Sep 13, 2025

Detection of Inflammasome Activation and Pyroptotic Cell Death in Murine Bone Marrow-derived Macrophages
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Detection of Inflammasome Activation and Pyroptotic Cell Death in Murine Bone Marrow-derived Macrophages

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The Hippo pathway kinase MST1 mediates a feedback loop to maintain NLRP3 inflammasome homeostasis

Xiawei Huang1, Jiahui Wang1, Yao Liu1

  • 1State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen, Fujian 361102, China.

Cell Reports
|July 27, 2025
PubMed

Insights

A newly discovered negative feedback loop involving mammalian Ste20-like kinase 1 (MST1) prevents NLRP3 inflammasome overactivation. MST1 cleavage enhances its activity, inhibiting inflammasome assembly and reducing inflammation, offering a potential therapeutic target.

Area of Science:

  • Immunology
  • Cell Signaling
  • Molecular Biology

Background:

  • Inflammasomes are critical for immune responses but require strict regulation to prevent inflammatory diseases.
  • Understanding negative feedback mechanisms is crucial for maintaining immune homeostasis and controlling inflammasome overactivation.

Purpose of the Study:

  • To identify and characterize negative feedback mechanisms that prevent NLRP3 inflammasome hyperactivation.
  • To elucidate the role of mammalian Ste20-like kinase 1 (MST1) in regulating inflammasome activity.

Main Methods:

  • Investigated the interaction between MST1 and the NLRP3 inflammasome pathway.
  • Analyzed caspase-1-dependent cleavage of MST1 and its impact on kinase activity.
  • Examined the phosphorylation of ASC by MST1 and its effect on inflammasome assembly.
  • Utilized a lipopolysaccharide (LPS)-induced sepsis mouse model to assess the therapeutic potential of MST1 activation.

Main Results:

  • NLRP3 inflammasome activation leads to caspase-1-dependent cleavage and activation of MST1.
  • Activated MST1 phosphorylates ASC at serine 58, disrupting ASC oligomerization and attenuating inflammasome assembly.
  • Staurosporine (STS), an MST1 activator, reduced inflammation and tissue damage in a mouse model of sepsis.

Conclusions:

  • A novel negative feedback loop mediated by MST1 cleavage regulates NLRP3 inflammasome activity.
  • MST1 cleavage is a key event in preventing inflammasome hyperactivation and maintaining inflammatory homeostasis.
  • MST1 cleavage represents a potential therapeutic strategy for managing inflammatory diseases.
Keywords:
ASCCP: ImmunologyCP: Molecular biologyHippo pathwayMST1/2NLRP3caspase-1endoproteolytic cleavagefeedback loopinflammasomephosphorylation

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