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

The Endotoxin Delivery Protein HMGB1 Mediates Caspase-11-Dependent Lethality in Sepsis.
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内毒素递送蛋白 HMGB1 介导脓毒症中 Caspase-11 依赖性致死率

DOI:
10.1016/j.immuni.2018.08.016
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发表时间:
2018-10-16
期刊:
影响因子:
32.4
通讯作者:
Lu B
Lu B
中科院分区:
医学1区
文献类型:
--
作者:
Deng M;Tang Y;Li W;Wang X;Zhang R;Zhang X;Zhao X;Liu J;Tang C;Liu Z;Huang Y;Peng H;Xiao L;Tang D;Scott MJ;Wang Q;Liu J;Xiao X;Watkins S;Li J;Yang H;Wang H;Chen F;Tracey KJ;Billiar TR;Lu B

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Caspase-11是一种胞质内毒素(脂多糖:LPS)受体,介导细胞凋亡,一种细胞死亡的裂解形式。Caspase-11依赖性的细胞凋亡介导内毒素血症的致死性,但目前尚不清楚LPS是如何被递送到胞质溶胶中以激活caspase-11的。我们发现,肝细胞释放的高迁移率族蛋白B1(HMGB 1)是内毒素血症和细菌性脓毒症中caspase-11依赖性细胞凋亡和致死所必需的。从机制上讲,肝细胞释放的HMGB 1结合LPS,并通过晚期糖基化终产物受体(receptor for advanced glycation end-products,RECEPTOR)将其内化到巨噬细胞和内皮细胞的溶酶体中。随后,HMGB 1在溶酶体的酸性环境中透化磷脂双层。这导致LPS渗漏到胞质溶胶中和半胱天冬酶-11活化。肝细胞HMGB 1的耗竭、肝细胞HMGB 1释放的抑制、细胞外HMGB 1的中和或HMGB 1的缺乏阻止了内毒素血症和细菌性脓毒症中caspase-11依赖性的焦亡和死亡。这些发现表明,HMGB 1与LPS相互作用,介导半胱天冬酶-11依赖性的脓毒症。
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.
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