Amelioration of sepsis by inhibiting sialidase-mediated disruption of the CD24-SiglecG interaction.

Amelioration of sepsis by inhibiting sialidase-mediated disruption of the CD24-SiglecG interaction.
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DOI:
10.1038/nbt.1846
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发表时间:
2011-05
影响因子:
46.9
通讯作者:
--
中科院分区:
工程技术1区
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--
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控制炎症是治疗感染性疾病的关键。病原体相关和/或炎症相关的分子模式(分别为PAMP和DAMP)是炎症的两个主要诱导物。由于CD 24-Siglec G/10相互作用选择性地抑制对DAMP的炎症反应,因此微生物对负调节的破坏将提供加剧炎症的一般机制。在此,我们发现Siglec G/10对CD 24的唾液酸基模式抑制是多菌性脓毒症中唾液酸酶的靶向。唾液酸酶抑制剂通过CD 24-Siglecg依赖性机制保护小鼠免受败血症,而CD 24或Siglecg的靶向突变会加重败血症。细菌唾液酸酶和宿主CD 24和Siglecg基因相互作用以确定病原体毒力。我们的数据表明,破坏唾液酸为基础的模式在微生物毒力的抑制的关键作用,并提出了一种治疗方法,以抑制感染期间有害的炎症反应。
Control of inflammation is critical for therapy of infectious diseases. Pathogen-associated and/or danger-associated molecular patterns (PAMPs and DAMPs, respectively) are the two major inducers of inflammation. Because the CD24-Siglec G/10 interactions selectively repress inflammatory response to DAMPs, microbial disruption of the negative regulation would provide a general mechanism to exacerbate inflammation. Here we show that the sialic acid-based pattern recognitions of CD24 by Siglec G/10 are targeted by sialidases in polybacterial sepsis. Sialidase inhibitors protect mice against sepsis by a CD24-Siglecg-dependent mechanism, whereas a targeted mutation of either CD24 or Siglecg exacerbates sepsis. Bacterial sialidase and host CD24 and Siglecg genes interact to determine pathogen virulence. Our data demonstrate a critical role for disrupting sialic acid-based pattern recognitions in microbial virulence and suggest a therapeutic approach to dampen harmful inflammatory response during infection.
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