Abstract
The non-canonical inflammasome pathway functions as the primary cytosolic innate immune detection mechanism for Gram-negative bacterial lipopolysaccharide (LPS) in human and mouse cells and controls the proteolytic activation of the cell death executor gasdermin D (GSDMD). The main effectors of this pathways are the inflammatory proteases caspase-11 in mice and caspase-4/caspase-5 in humans. These caspases have been shown to bind LPS directly; however, the interaction between LPS and caspase-4/caspase-11 requires a set of interferon (IFN)-inducible GTPases, known as guanylate-binding proteins (GBPs). These GBPs assemble to form coatomers on cytosolic Gram-negative bacteria, which function as recruitment and activation platforms for caspase-11/caspase-4. Here we describe an assay to monitor caspase-4 activation in human cells by immunoblotting and its recruitment to intracellular bacteria using the model pathogen Burkholderia thailandensis.
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Dilucca, M., Broz, P. (2023). Caspase-4 Activation and Recruitment to Intracellular Gram-Negative Bacteria. In: Fink, S.L. (eds) Pyroptosis. Methods in Molecular Biology, vol 2641. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3040-2_5
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DOI: https://doi.org/10.1007/978-1-0716-3040-2_5
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