Staphylococcal complement evasion by various convertase-blocking molecules.

Staphylococcal complement evasion by various convertase-blocking molecules.
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DOI:
10.1084/jem.20070818
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发表时间:
2007-10-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Rooijakkers SH
Rooijakkers SH
中科院分区:
其他
文献类型:
--
作者:
Jongerius I;Köhl J;Pandey MK;Ruyken M;van Kessel KP;van Strijp JA;Rooijakkers SH

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为了对抗人类的免疫反应,细菌应该能够转移补体系统的有效性。我们在金黄色葡萄球菌中发现了四种有效的补体抑制剂,它们是一个新的免疫逃避簇的一部分。两个是C3转换酶调节剂葡萄球菌补体抑制物(SCIN)的同系物,其功能与SCIN相似。细胞外纤维蛋白原结合蛋白(EFB)及其同系物细胞外补体结合蛋白(ECB)被认为是有效的补体逃避分子,其抑制机制被认为是抑制含有C3b的转换酶:交替途径C3转换酶C3bBb和C5转换酶C4b2aC3b和C3b2Bb。EFB和ECB在体外阻断C5a生成和C5a介导的中性粒细胞激活的能力证明了它们阻断C5转换酶活性的效力。此外,在免疫复合型腹膜炎的小鼠模型中,ECB阻止依赖C5a的中性粒细胞重新进入腹膜腔。这些新型金黄色葡萄球菌衍生的转换酶抑制剂的强大抗炎性能使这些化合物成为治疗补体介导的疾病的有趣的候选药物。
To combat the human immune response, bacteria should be able to divert the effectiveness of the complement system. We identify four potent complement inhibitors in Staphylococcus aureus that are part of a new immune evasion cluster. Two are homologues of the C3 convertase modulator staphylococcal complement inhibitor (SCIN) and function in a similar way as SCIN. Extracellular fibrinogen-binding protein (Efb) and its homologue extracellular complement-binding protein (Ecb) are identified as potent complement evasion molecules, and their inhibitory mechanism was pinpointed to blocking C3b-containing convertases: the alternative pathway C3 convertase C3bBb and the C5 convertases C4b2aC3b and C3b2Bb. The potency of Efb and Ecb to block C5 convertase activity was demonstrated by their ability to block C5a generation and C5a-mediated neutrophil activation in vitro. Further, Ecb blocks C5a-dependent neutrophil recruitment into the peritoneal cavity in a mouse model of immune complex peritonitis. The strong antiinflammatory properties of these novel S. aureus–derived convertase inhibitors make these compounds interesting drug candidates for complement-mediated diseases.
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