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Updated: Jan 2, 2026
Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
Published on: May 22, 2014
Role of Macrophage Migration Inhibitory Factor in NLRP3 Inflammasome Expression in Otitis Media
Shin Kariya1, Mitsuhiro Okano1,2, Pengfei Zhao1
1Department of Otolaryngology-Head and Neck Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama.
Hypothesis:
Macrophage migration inhibitory factor plays an important role in the expression of interleukin (IL)-1β and the nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3) inflammasome in lipopolysaccharide-induced otitis media.
Background:
NLRP3 inflammasome and macrophage migration inhibitory factor are critical molecules mediating inflammation. However, the interaction between the NLRP3 inflammasome and macrophage migration inhibitory factor has not been fully examined.
Methods:
Wild-type mice and macrophage migration inhibitory factor gene-deficient (MIF) mice received a transtympanic injection of either lipopolysaccharide or phosphate-buffered saline. The mice were sacrificed 24 hours after the injection. Concentrations of IL-1β, NLRP3, ASC (apoptosis-associated speck-like protein containing a caspase recruitment domain and a pyrin domain), and caspase-1 in the middle ear effusions were measured by enzyme-linked immunosorbent assay. Temporal bones were processed for histologic examination and immunohistochemistry.
Results:
In the immunohistochemical study using the wild-type mice, positive staining of macrophage migration inhibitory factor, NLRP3, ASC, and caspase-1 were observed in infiltrating inflammatory cells induced by lipopolysaccharide in the middle ear. The number of inflammatory cells caused by lipopolysaccharide administration decreased remarkably in the MIF mice as compared with the wild-type mice. The concentrations of IL-1β, NLRP3, ASC, and caspase-1 increased in the lipopolysaccharide-treated wild-type mice. The MIF mice with lipopolysaccharide had decreased levels of IL-1β, NLRP3, ASC, and caspase-1 as compared with the wild-type mice.
Conclusion:
Macrophage migration inhibitory factor has an important role in the production of IL-1β and the NLRP3 inflammasome. Controlling the inflammation by modulating macrophage migration inhibitory factor and the NLRP3 inflammasome may be a novel therapeutic strategy for otitis media.
Insights
Macrophage migration inhibitory factor (MIF) is crucial for interleukin-1β and NLRP3 inflammasome activation in otitis media. Reducing MIF levels significantly lowers inflammation markers in this condition.
Area of Science:
- Immunology
- Otolaryngology
- Molecular Biology
Background:
- Macrophage migration inhibitory factor (MIF) and the NLRP3 inflammasome are key inflammatory mediators.
- The precise interaction between MIF and the NLRP3 inflammasome in otitis media remains incompletely understood.
Purpose of the Study:
- To investigate the role of MIF in lipopolysaccharide-induced otitis media.
- To elucidate the relationship between MIF and the NLRP3 inflammasome pathway in this condition.
Main Methods:
- Utilized wild-type and MIF gene-deficient mice subjected to lipopolysaccharide-induced otitis media.
- Quantified IL-1β, NLRP3, ASC, and caspase-1 levels via ELISA and assessed inflammatory cell infiltration via histology and immunohistochemistry.
Main Results:
- LPS challenge increased MIF, NLRP3, ASC, and caspase-1 expression in wild-type mice.
- Mice deficient in MIF exhibited significantly reduced inflammatory cell infiltration and lower levels of IL-1β, NLRP3, ASC, and caspase-1 compared to wild-type controls.
- Positive staining for MIF, NLRP3, ASC, and caspase-1 was observed in inflammatory cells of the middle ear.
Conclusions:
- MIF plays a significant role in IL-1β production and NLRP3 inflammasome activation during otitis media.
- Targeting MIF and the NLRP3 inflammasome presents a potential therapeutic strategy for managing otitis media inflammation.
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