Shiga toxin targets the podocyte causing hemolytic uremic syndrome through endothelial complement activation.
Shiga toxin targets the podocyte causing hemolytic uremic syndrome through endothelial complement activation.
复制标题
志贺毒素靶向足细胞,通过激活内皮补体引起溶血性尿毒症综合征。
DOI:
10.1016/j.medj.2023.09.002
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Bowen EE
中科院分区:
文献类型:
--
作者:
Bowen EE
BackgroundShiga toxin (Stx)-producingEscherichia colihemolytic uremic syndrome (STEC-HUS) is the leading cause of acute kidney injury in children, with an associated mortality of up to 5%. The mechanisms underlying STEC-HUS and why the glomerular microvasculature is so susceptible to injury following systemic Stx infection are unclear.MethodsTransgenic mice were engineered to express the Stx receptor (Gb3) exclusively in their kidney podocytes (Pod-Gb3) and challenged with systemic Stx. Human glomerular cell models and kidney biopsies from patients with STEC-HUS were also studied.FindingsStx-challenged Pod-Gb3 mice developed STEC-HUS. This was mediated by a reduction in podocyte vascular endothelial growth factor A (VEGF-A), which led to loss of glomerular endothelial cell (GEnC) glycocalyx, a reduction in GEnC inhibitory complement factor H binding, and local activation of the complement pathway. Early therapeutic inhibition of the terminal complement pathway with a C5 inhibitor rescued this podocyte-driven, Stx-induced HUS phenotype.ConclusionsThis study potentially explains why systemic Stx exposure targets the glomerulus and supports the early use of terminal complement pathway inhibition in this devastating disease.FundingThis work was supported by the UK Medical Research Council (MRC) (grant nos. G0901987 and MR/K010492/1) and Kidney Research UK (grant nos. TF_007_20151127, RP42/2012, and SP/FSGS1/2013). The Mary Lyon Center is part of the MRC Harwell Institute and is funded by the MRC (A410).
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