Related Experiment Video

Updated: Feb 8, 2026

Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
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Hemin Induces the Activation of NLRP3 Inflammasome in N9 Microglial Cells

Yan Tan1, Si-Wei Tan, Bo-Ya Fan

  • 1Molecular Biology Center; State Key Lab of Trauma, Burns and Combined Injury; Research Institute of Surgery and Daping Hospital, Army Medical University, Chongqing, China.

Iranian Journal of Immunology : IJI
|June 28, 2018
PubMed
Abstract

Insights

Hemin activates the NLRP3 inflammasome in microglia, a key process in brain injury. However, this activation does not directly cause inflammation or pyroptosis, suggesting a complex role in neuroinflammation.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Hemin is a sterile component triggering neuroinflammation post-intracerebral hemorrhage.
  • NLRP3 inflammasome activation is implicated in this response.
  • The role of hemin in microglial NLRP3 activation is not well understood.

Purpose of the Study:

  • To determine if hemin activates the NLRP3/caspase-1 pathway in microglia.
  • To investigate hemin's role in microglia-mediated secondary injury.

Main Methods:

  • N9 microglial cells were treated with hemin.
  • Caspase-1 p10 production and NLRP3 inflammasome assembly were measured.
  • IL-1β secretion was quantified using ELISA.

Main Results:

  • Hemin induced dose- and time-dependent caspase-1 activation.
  • Hemin triggered NLRP3 inflammasome assembly without increasing IL-1β.
  • Neither hemin-treated primary microglia nor N9 cells showed increased IL-1β secretion.
  • Hemin-induced NLRP3 activation did not significantly impact pyroptosis.

Conclusions:

  • Hemin acts as a sterile danger signal molecule.
  • Hemin can activate the inflammasome in microglia.
  • This activation does not directly mediate inflammation or pyroptosis in microglia.

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