The Endotoxin Delivery Protein HMGB1 Mediates Caspase-11-Dependent Lethality in Sepsis

Meihong Deng, Yiting Tang, Wenbo Li, Xiangyu Wang, Rui Zhang, Xianying Zhang, Xin Zhao, Jian Liu, Cheng Tang, Zhonghua Liu, Yongzhuo Huang, Huige Peng, Lehui Xiao, Daolin Tang, Melanie J. Scott, Qingde Wang, Jing Liu, Xianzhong Xiao, Simon Watkins, Jianhua LiHuan Yang, Haichao Wang, Fangping Chen, Kevin J. Tracey, Timothy R. Billiar, Ben Lu

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

Caspase-11, a cytosolic endotoxin (lipopolysaccharide: LPS) receptor, mediates pyroptosis, a lytic form of cell death. Caspase-11-dependent pyroptosis mediates lethality in endotoxemia, but it is unclear how LPS is delivered into the cytosol for the activation of caspase-11. Here we discovered that hepatocyte-released high mobility group box 1 (HMGB1) was required for caspase-11-dependent pyroptosis and lethality in endotoxemia and bacterial sepsis. Mechanistically, hepatocyte-released HMGB1 bound LPS and targeted its internalization into the lysosomes of macrophages and endothelial cells via the receptor for advanced glycation end-products (RAGE). Subsequently, HMGB1 permeabilized the phospholipid bilayer in the acidic environment of lysosomes. This resulted in LPS leakage into the cytosol and caspase-11 activation. Depletion of hepatocyte HMGB1, inhibition of hepatocyte HMGB1 release, neutralizing extracellular HMGB1, or RAGE deficiency prevented caspase-11-dependent pyroptosis and death in endotoxemia and bacterial sepsis. These findings indicate that HMGB1 interacts with LPS to mediate caspase-11-dependent pyroptosis in lethal sepsis. Caspase-11, a cytosolic LPS receptor, mediates endotoxic shock. Deng and colleagues demonstrate that hepatocyte-released HMGB1 mediates caspase-11-dependent pyroptosis and lethality in sepsis by delivering extracellular LPS into the cytosol of macrophages and endothelial cells, where LPS activates caspase-11.

Original languageEnglish (US)
Pages (from-to)740-753.e7
JournalImmunity
Volume49
Issue number4
DOIs
StatePublished - Oct 16 2018
Externally publishedYes

Keywords

  • HMGB1
  • caspase-11
  • endotoxemia
  • inflammasome
  • pyroptosis
  • sepsis

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases

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