An essential role of high-molecular-weight kininogen in endotoxemia.

An essential role of high-molecular-weight kininogen in endotoxemia.
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高分子量激肽原在内毒素血症中的重要作用

DOI:
10.1084/jem.20161900
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发表时间:
2017-09-04
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Wu Y
Wu Y
中科院分区:
其他
文献类型:
--
作者:
Yang A;Xie Z;Wang B;Colman RW;Dai J;Wu Y

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在这项研究中,我们表明,小鼠缺乏高分子量激肽原(HK)抵抗脂多糖(LPS)诱导的死亡率,并显着降低循环LPS水平。用人HK补充HK缺陷小鼠恢复LPS水平,并使小鼠对LPS诱导的死亡率敏感。HK与LPS的结合通过O-多糖/核心寡糖发生,与K结合LPS的能力一致。pneumoniae、铜绿假单胞菌、S. miniaturia和不同的E.大肠杆菌菌株。LPS的结合诱导血浆HK裂解为双链形式(HKa,含有重链[HC]和轻链[LC])和缓激肽。HKa和LC都能解聚LPS,但HC不能。轻链通过结构域5(DHG 15)中的结合位点以高亲和力(Kd = 1.52 × 10−9 M)结合LPS。抗D5的单克隆抗体显著降低了LPS诱导的野生型小鼠死亡率和循环LPS水平。因此,HK作为循环中LPS的主要载体,在内毒素血症中起重要作用。
In this study, we show that mice lacking high-molecular-weight kininogen (HK) were resistant to lipopolysaccharide (LPS)-induced mortality and had significantly reduced circulating LPS levels. Replenishment of HK-deficient mice with human HK recovered the LPS levels and rendered the mice susceptible to LPS-induced mortality. Binding of HK to LPS occurred through the O-polysaccharide/core oligosaccharide, consistent with the ability to bind LPS from K. pneumoniae, P. aeruginosa, S. minnesota, and different E. coli strains. Binding of LPS induced plasma HK cleavage to the two-chain form (HKa, containing a heavy chain [HC] and a light chain [LC]) and bradykinin. Both HKa and the LC, but not the HC, could disaggregate LPS. The light chain bound LPS with high affinity (Kd = 1.52 × 10−9 M) through a binding site in domain 5 (DHG15). A monoclonal antibody against D5 significantly reduced LPS-induced mortality and circulating LPS levels in wild-type mice. Thus, HK, as a major LPS carrier in circulation, plays an essential role in endotoxemia.
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