Growth inhibition of cytosolic Salmonella by caspase-1 and caspase-11 precedes host cell death

Teresa L. M. Thurston (), Sophie A. Matthews, Elliott Jennings, Eric Alix, Feng Shao, Avinash R. Shenoy, Mark A. Birrell and David W. Holden ()
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Teresa L. M. Thurston: MRC Centre for Molecular Bacteriology and Infection, Imperial College London
Sophie A. Matthews: MRC Centre for Molecular Bacteriology and Infection, Imperial College London
Elliott Jennings: MRC Centre for Molecular Bacteriology and Infection, Imperial College London
Eric Alix: MRC Centre for Molecular Bacteriology and Infection, Imperial College London
Feng Shao: National Institute of Biological Sciences
Avinash R. Shenoy: MRC Centre for Molecular Bacteriology and Infection, Imperial College London
Mark A. Birrell: Respiratory Pharmacology, Pharmacology & Toxicology Section, Imperial College London
David W. Holden: MRC Centre for Molecular Bacteriology and Infection, Imperial College London

Nature Communications, 2016, vol. 7, issue 1, 1-15

Abstract: Abstract Sensing bacterial products in the cytosol of mammalian cells by NOD-like receptors leads to the activation of caspase-1 inflammasomes, and the production of the pro-inflammatory cytokines interleukin (IL)-18 and IL-1β. In addition, mouse caspase-11 (represented in humans by its orthologs, caspase-4 and caspase-5) detects cytosolic bacterial LPS directly. Activation of caspase-1 and caspase-11 initiates pyroptotic host cell death that releases potentially harmful bacteria from the nutrient-rich host cell cytosol into the extracellular environment. Here we use single cell analysis and time-lapse microscopy to identify a subpopulation of host cells, in which growth of cytosolic Salmonella Typhimurium is inhibited independently or prior to the onset of cell death. The enzymatic activities of caspase-1 and caspase-11 are required for growth inhibition in different cell types. Our results reveal that these proteases have important functions beyond the direct induction of pyroptosis and proinflammatory cytokine secretion in the control of growth and elimination of cytosolic bacteria.

Date: 2016
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DOI: 10.1038/ncomms13292

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