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Updated: Jul 25, 2025
Detection of Inflammasome Activation and Pyroptotic Cell Death in Murine Bone Marrow-derived Macrophages
Published on: May 21, 2018
Live Imaging of Pyroptosis in Primary Murine Macrophages
Caroline L Holley1, Kate Schroder2
1Institute for Molecular Bioscience, and Centre for Inflammation and Disease Research, The University of Queensland, St. Lucia, Australia.
Abstract:
Inflammasomes are the ultimate weapon of the macrophage immune arsenal. Inflammasome signalling in macrophages triggers pyroptosis, a lytic cell death pathway that facilitates inflammation-driven pathogen clearance. Imaging-based approaches to investigating cell death have proven useful, revealing cellular remodelling events such as the generation of extracellular vesicles, and continuing to uncover important structural changes in cells involved in inflammatory signalling. Pyroptosis has proved extremely challenging to image, because its lytic nature is incompatible with many well-established imaging approaches employed for other, non-lytic pathways. The complexities of ectopically expressing fluorescent constructs in primary macrophages and the sensitivity of such proteins to drug-based probes compound this difficulty. We and others have demonstrated key differences in pyroptosis induced by canonical versus noncanonical inflammasomes that delineate functional differences between these signalling pathways. Here, we describe a live imaging approach to study and compare canonical versus noncanonical inflammasome signalling and pyroptotic architecture in primary murine macrophages.
Insights
This study introduces a novel live imaging method to visualize pyroptosis, a cell death process crucial for immunity. The technique differentiates between canonical and noncanonical inflammasome pathways in macrophages.
Area of Science:
- Immunology
- Cell Biology
- Microscopy
Background:
- Inflammasomes are critical for macrophage immune responses, initiating pyroptosis, a lytic cell death pathway essential for pathogen clearance.
- Pyroptosis, characterized by cell lysis, presents significant imaging challenges due to its destructive nature, unlike other cell death pathways.
- Existing imaging methods struggle with the complexities of primary macrophage transfection and probe sensitivity, hindering detailed study.
Purpose of the Study:
- To develop and present a live imaging approach for studying pyroptosis in primary murine macrophages.
- To enable the comparison of canonical versus noncanonical inflammasome signaling pathways and their impact on pyroptotic cell architecture.
Main Methods:
- Development of a live imaging technique specifically designed to overcome the challenges of visualizing pyroptosis.
- Application of the method to primary murine macrophages to observe cellular events during pyroptosis.
- Comparative analysis of pyroptosis induced by canonical and noncanonical inflammasome activation.
Main Results:
- The developed live imaging approach successfully visualizes pyroptotic architecture in macrophages.
- Distinct differences in pyroptosis induced by canonical and noncanonical inflammasomes were observed and characterized.
- The study provides new insights into the structural changes associated with different inflammasome signaling pathways.
Conclusions:
- This novel live imaging method offers a powerful tool for dissecting pyroptosis mechanisms.
- The findings highlight functional differences between canonical and noncanonical inflammasome pathways based on pyroptotic morphology.
- The approach facilitates a deeper understanding of inflammatory signaling and cell death in macrophages.
