Cited by 2,285Inflammasome and immune disordersImmune Response and InflammationCell death mechanisms and regulation

Inflammatory caspases are innate immune receptors for intracellular LPS

Shi, Jianjin, Zhao, Yue, Wang, Yupeng, Gao, Wenqing, Ding, Jingjin, Li, Peng, Hu, Liyan, Shao, Feng·2014·Nature

Abstract

The murine caspase-11 non-canonical inflammasome responds to various bacterial infections. Caspase-11 activation-induced pyroptosis, in response to cytoplasmic lipopolysaccharide (LPS), is critical for endotoxic shock in mice. The mechanism underlying cytosolic LPS sensing and the responsible pattern recognition receptor are unknown. Here we show that human monocytes, epithelial cells and keratinocytes undergo necrosis upon cytoplasmic delivery of LPS. LPS-induced cytotoxicity was mediated by human caspase-4 that could functionally complement murine caspase-11. Human caspase-4 and the mouse homologue caspase-11 (hereafter referred to as caspase-4/11) and also human caspase-5, directly bound to LPS and lipid A with high specificity and affinity. LPS associated with endogenous caspase-11 in pyroptotic cells. Insect-cell purified caspase-4/11 underwent oligomerization upon LPS binding, resulting in activation of the caspases. Underacylated lipid IVa and lipopolysaccharide from Rhodobacter sphaeroides (LPS-RS) could bind to caspase-4/11 but failed to induce their oligomerization and activation. LPS binding was mediated by the CARD domain of the caspase. Binding-deficient CARD-domain point mutants did not respond to LPS with oligomerization or activation and failed to induce pyroptosis upon LPS electroporation or bacterial infections. The function of caspase-4/5/11 represents a new mode of pattern recognition in immunity and also an unprecedented means of caspase activation.

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Crossref · 10.1038/nature13683

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Authors
Shi, J., Zhao, Y., Wang, Y., Gao, W., Ding, J., Li, P., Hu, L., & Shao, F.
Affiliations
  • Peking University (CN)
  • National Institute of Biological Sciences, Beijing (CN)
  • Chinese Academy of Sciences (CN)
Corresponding author
Shao, Feng
Venue
Nature
Published
2014-08-06
Volume
514
Issue
7521
Pages
187-192
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2068619092
Cited by
2,285
References
41
Citations by year
2026: 190 · 2025: 205 · 2024: 231 · 2023: 277 · 2022: 254 · 2021: 227 · 2020: 193 · 2019: 162 · 2018: 158 · 2017: 131 · 2016: 128 · 2015: 103 · 2014: 23
FWCI
52.72
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • Tsinghua University
  • University of British Columbia
  • National Key Research and Development Program of China
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
caspase-4, caspase-5, non-canonical inflammasome, pyroptosis, pattern recognition receptors, CARD domain, lipid A, endotoxic shock, intracellular bacterial infection, innate immunity, inflammatory cell death
MeSH terms
Animals, Cells, Cultured, Enzyme Activation, Epithelial Cells, Genetic Complementation Test, Humans, Immunity, Innate, Inflammation, Lipid A, Lipopolysaccharides, Macrophages, Necrosis, Protein Binding, Rhodobacter sphaeroides, Substrate Specificity, Keratinocytes, Cell Death, Caspases, Surface Plasmon Resonance, Mutant Proteins, Mice, Caspases, Initiator, Protein Multimerization

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