Staphylococcus sciuri exfoliative toxin C (ExhC) is a necrosis-inducer for mammalian cells.

Staphylococcus sciuri exfoliative toxin C (ExhC) is a necrosis-inducer for mammalian cells.
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松鼠葡萄球菌剥脱性毒素 C (ExhC) 是哺乳动物细胞的坏死诱导剂

DOI:
10.1371/journal.pone.0023145
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Zheng SJ
Zheng SJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li H;Wang Y;Ding L;Zheng SJ

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松鼠葡萄球菌 (S. sciuri) 是人类罕见的病原体,但它可引起多种人类感染。最近,据报道松鼠链球菌分离株(HBXX06)可引起仔猪致命的渗出性表皮炎(EE),因此被认为是一种潜在的人畜共患病原体。为了研究这种细菌的致病性,我们克隆了松鼠链球菌分离株的主要毒素——剥脱性毒素 C (ExhC),并使用体外细胞培养物和新生小鼠作为模型,对重组 ExhC-his (rExhC) 蛋白进行了功能分析。我们发现rExhC可以诱导多种细胞系和腹腔巨噬细胞的坏死以及新生小鼠的皮肤病变,并且如果rExhC的79-128位氨基酸被删除或用单克隆抗体(3E4)阻断,则rExhC诱导的细胞坏死或新生小鼠的皮肤病变可以完全消除,表明79-128部分是必需的坏死诱导结构域。该信息有助于进一步了解松鼠链球菌感染的机制。
Staphylococcus sciuri (S. sciuri) is a rare pathogen in humans, but it can cause a wide array of human infections. Recently a S. sciuri isolate (HBXX06) was reported to cause fatal exudative epidermitis (EE) in piglets and thus considered as a potential zoonotic agent. To investigate the pathogenicity of this bacterium, we cloned exfoliative toxin C (ExhC), a major toxin of the S. sciuri isolate and performed functional analysis of the recombinant ExhC-his (rExhC) protein using in vitro cell cultures and newborn mice as models. We found that rExhC could induce necrosis in multiple cell lines and peritoneal macrophages as well as skin lesions in newborn mice, and that the rExhC-induced necrosis in cells or skin lesions in newborn mice could be completely abolished if amino acids 79-128 of rExhC were deleted or blocked with a monoclonal antibody (3E4), indicating aa 79-128 portion as an essential necrosis-inducing domain. This information contributes to further understandings of the mechanisms underlying S. sciuri infection.
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