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Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
Published on: May 22, 2014
NLRP3 Inflammasome in Otitis Media With Effusion: Insights From Mouse Models and Human Samples
Shanshan Liu1,2, Tiantian Tang3, Lining Guo1,2
1Department of Otorhinolaryngology-Head and Neck Surgery, Beijing Children's Hospital, National Center for Children's Health, Capital Medical University.
Purpose:
Otitis media with effusion (OME) is a prevalent pediatric condition, yet its molecular mechanisms remain incompletely understood. The NLRP3 inflammasome is known to regulate inflammation in various diseases, but its role in OME remains unclear. This study aimed to investigate NLRP3 activation in OME using both a murine model and clinical samples.
Methods:
Experimental OME was induced in mice via intratympanic injection of lipopolysaccharide (LPS). On day 3 postinduction, middle ear tissues and lavage fluid were collected. Nlrp3 mRNA expression was assessed by qPCR, while cleaved caspase-1 and mature IL-1β protein levels were evaluated by western blotting. IL-1β levels in lavage fluid and serum were measured via ELISA. Human middle ear effusions (MEE) and matched serum samples were collected from pediatric OME patients, and concentrations of IL-1β and IL-18 were measured and normalized to total protein. To assess the functional role of NLRP3, OME was induced in Nlrp3 knockout ( Nlrp3-/- ) and wild-type (WT) mice, followed by otoscopic and histologic evaluation.
Results:
LPS-induced OME mice exhibited increased expression of NLRP3, cleaved caspase-1, and IL-1β. ELISA confirmed elevated IL-1β in middle ear lavage fluid. In human samples, IL-1β and IL-18 were significantly higher in MEE than in serum. Nlrp3-/- mice showed reduced IL-1β production but no significant differences in histopathology or effusion resolution compared with WT.
Conclusion:
NLRP3 inflammasome contributes to local inflammation in OME but does not significantly alter disease progression, suggesting involvement of additional inflammatory pathways.
Insights
The NLRP3 inflammasome contributes to inflammation in otitis media with effusion (OME) but doesn't significantly impact disease progression. Further research is needed to understand other inflammatory pathways involved in OME.
Area of Science:
- Otolaryngology
- Immunology
- Molecular Biology
Background:
- Otitis media with effusion (OME) is a common pediatric condition with unclear molecular mechanisms.
- The NLRP3 inflammasome's role in OME pathogenesis is not well-defined.
Purpose of the Study:
- Investigate NLRP3 inflammasome activation in a murine model and human samples of OME.
- Determine the functional significance of NLRP3 in OME development and resolution.
Main Methods:
- Induced experimental OME in mice using lipopolysaccharide (LPS).
- Assessed NLRP3, caspase-1, and IL-1β expression via qPCR and Western blotting.
- Measured IL-1β and IL-18 levels in human middle ear effusions (MEE) and serum samples.
Main Results:
- LPS-induced OME in mice showed increased NLRP3 inflammasome components and IL-1β.
- Human MEE samples had significantly higher IL-1β and IL-18 levels compared to serum.
- Nlrp3 knockout mice exhibited reduced IL-1β but similar OME histopathology and resolution to wild-type mice.
Conclusions:
- The NLRP3 inflammasome plays a role in local inflammation within OME.
- NLRP3 activation alone does not appear to significantly influence OME disease progression.
- Additional inflammatory pathways likely contribute to OME pathogenesis.
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