Related Experiment Video
Updated: Feb 12, 2026
Activation and Measurement of NLRP3 Inflammasome Activity Using IL-1β in Human Monocyte-derived Dendritic Cells
Published on: May 22, 2014
Cutting Edge: Mitochondrial Assembly of the NLRP3 Inflammasome Complex Is Initiated at Priming
Eric I Elliott1,2,3,4, Alexis N Miller3, Balaji Banoth3
1Interdisciplinary Graduate Program in Molecular Medicine, University of Iowa, Iowa City, IA 52242.
Abstract:
The NLRP3 inflammasome is activated in response to microbial and danger signals, resulting in caspase-1-dependent secretion of the proinflammatory cytokines IL-1β and IL-18. Canonical NLRP3 inflammasome activation is a two-step process requiring both priming and activation signals. During inflammasome activation, NLRP3 associates with mitochondria; however, the role for this interaction is unclear. In this article, we show that mouse NLRP3 and caspase-1 independently interact with the mitochondrial lipid cardiolipin, which is externalized to the outer mitochondrial membrane at priming in response to reactive oxygen species. An NLRP3 activation signal is then required for the calcium-dependent association of the adaptor molecule ASC with NLRP3 on the mitochondrial surface, resulting in inflammasome complex assembly and activation. These findings demonstrate a novel lipid interaction for caspase-1 and identify a role for mitochondria as supramolecular organizing centers in the assembly and activation of the NLRP3 inflammasome.
Insights
The NLRP3 inflammasome (a protein complex) uses mitochondria and cardiolipin (a lipid) to assemble and activate, releasing inflammatory signals. This reveals a new role for mitochondria in immune response regulation.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- The NLRP3 inflammasome mediates inflammatory responses via IL-1β and IL-18 secretion.
- Its activation requires priming and secondary signals, involving mitochondrial association, but the mechanism is unclear.
Purpose of the Study:
- To elucidate the role of mitochondria in NLRP3 inflammasome assembly and activation.
- To identify molecular interactions during inflammasome activation.
Main Methods:
- Investigated interactions between NLRP3, caspase-1, and mitochondrial cardiolipin.
- Analyzed the role of reactive oxygen species and calcium in inflammasome complex formation.
Main Results:
- NLRP3 and caspase-1 bind to cardiolipin, externalized to the outer mitochondrial membrane.
- Mitochondria act as organizing centers for inflammasome assembly via ASC recruitment.
- Calcium-dependent ASC-NLRP3 association on mitochondria is crucial for activation.
Conclusions:
- NLRP3 inflammasome activation involves direct interaction with mitochondrial cardiolipin.
- Mitochondria serve as platforms for supramolecular assembly of the NLRP3 inflammasome.
- Identified a novel lipid interaction mechanism for caspase-1 in inflammasome activation.
More Related Videos
09:53Author Spotlight: Advancing Techniques and Discoveries in Protein Synthesis and Assembly Through Innovative Mitochondrial Research
Published on: June 7, 2024
08:07Analysis of the Expression and Complexes Assembly of the Mitochondrial Respiratory Chain Proteins in the Fission Yeast Schizosaccharomyces pombe
Published on: May 2, 2025
Related Concept Videos
02:41Protein Complex Assembly
Many viruses self-assemble into a fully functional unit using the infected host cell to...
02:41Protein Complex Assembly
01:30Assembly of Signaling Complexes
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
01:32Assembly of Complex Microtubule Structures
02:33Initiation of Translation
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
02:33Initiation of Translation