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Updated: Feb 22, 2026
Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
Published on: May 22, 2014
Methylene blue inhibits NLRP3, NLRC4, AIM2, and non-canonical inflammasome activation
Huijeong Ahn1, Seung Goo Kang2, Sung-Il Yoon2
1College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon, Gangwon, 24341, Republic of Korea.
Abstract:
Methylene blue (MB), which has antioxidant, anti-inflammatory, neuroprotective, and mitochondria protective effects, has been widely used as a dye and medication. However, the effect of MB on inflammasome activation has not yet been studied. Inflammasomes are multi-protein complexes that induce maturation of interleukins (ILs)-1β and -18 as well as caspase-1-mediated cell death, known as pyroptosis. Dysregulation of inflammasomes causes several diseases such as type 2 diabetes, Alzheimer's disease, and gout. In this study, we assess the effect of MB on inflammasome activation in macrophages. As the result, MB attenuated activation of canonical inflammasomes such as NLRP3, NLRC4, and AIM2 as well as non-canonical inflammasome activation. In addition, MB inhibited upstream signals such as inflammasome assembly, phagocytosis, and gene expression of inflammasome components via inhibition of NF-κB signaling. Furthermore, MB reduced the activity of caspase-1. The anti-inflammasome properties of MB were further confirmed in mice models. Thus, we suggest that MB is a broad-spectrum anti-inflammasome candidate molecule.
Insights
Methylene blue (MB) effectively inhibits inflammasome activation, a key process in inflammatory diseases. This study reveals MB
Area of Science:
- Immunology
- Molecular Biology
- Pharmacology
Background:
- Methylene blue (MB) is a versatile compound with known antioxidant, anti-inflammatory, and neuroprotective properties.
- Inflammasomes are critical protein complexes regulating inflammatory responses, and their dysregulation is linked to various diseases.
- The impact of MB on inflammasome activation remained unexplored prior to this study.
Purpose of the Study:
- To investigate the effect of Methylene blue on the activation of canonical and non-canonical inflammasomes.
- To elucidate the molecular mechanisms underlying MB's potential anti-inflammasome activity.
- To evaluate the therapeutic potential of MB as a broad-spectrum anti-inflammasome agent.
Main Methods:
- Assessment of MB's effect on inflammasome activation in macrophage cell lines.
- Analysis of inflammasome assembly, phagocytosis, and gene expression.
- Inhibition of NF-κB signaling pathway.
- Measurement of caspase-1 activity.
- Validation in mouse models.
Main Results:
- Methylene blue significantly attenuated the activation of NLRP3, NLRC4, and AIM2 inflammasomes.
- MB inhibited upstream inflammasome signaling, including assembly, phagocytosis, and component gene expression, by suppressing NF-κB.
- MB reduced caspase-1 activity, a key mediator of pyroptosis.
- In vivo studies in mice confirmed the anti-inflammasome properties of MB.
Conclusions:
- Methylene blue demonstrates potent broad-spectrum anti-inflammasome activity.
- MB acts by inhibiting key inflammasome components and upstream signaling pathways, including NF-κB.
- Methylene blue presents a promising candidate molecule for therapeutic intervention in inflammasome-associated diseases.
