脑膜炎球菌 劫持一个β2-上腺受体/β-阿雷斯通道,穿过大脑微血管内皮
Mathieu Coureuil1, Hervé Lécuyer, Mark G H Scott
1Université Paris Descartes, Faculté de Médecine, 75006 Paris, France.
Cell
|December 25, 2010
概括
脑膜炎球菌通过特定的β-上腺体受体通路劫持大脑内皮细胞. 这种细菌机制稳定了粘附,并为感染创造了空隙,提供了新的治疗点.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- 脑膜炎的原因是Neisseria meningitidis通过殖民人类大脑内皮细胞来引起脑膜炎.
- 脑膜炎球菌粘附触发宿主细胞信号,导致结口开放和组织入侵.
- 介导这一过程的特定宿主细胞受体以前未被确定.
研究的目的:
- 为了识别宿主细胞在内皮细胞粘附过程中被N. meningitidis利用的信号受体.
- 阐明涉及脑膜炎球菌入侵的下游信号事件和细胞机制.
- 探索针对这种宿主-病原体相互作用的潜在治疗策略.
主要方法:
- 研究了N. meningitidis与人类大脑内皮细胞的相互作用.
- 利用基于细胞的测试来识别病原体激活的信号受体.
- 研究了β-arrestin,Src tyrosine kinase和结合蛋白在细菌粘附和侵入中的作用.
- 评估了β-腺受体激动剂在阻断细菌转位的有效性.
主要成果:
- 脑膜炎菌特别激活了内皮细胞中偏向的β2-上腺受体/β-止素信号通路.
- 这条通路在细菌群落下隔离β-逮捕因子相互作用体,包括Src酶和结合蛋白.
- 通过β-arrestin介导的Src激活稳定了细菌的附着性,而结节蛋白脱局则造成了入侵缺口.
- 用激素向β-腺素受体内细胞结核,抑制了N. meningitidis在内皮屏障上的转移.
结论:
- N. meningitidis 劫持了宿主β2-上腺受体/β-止素通路,以侵入内皮细胞.
- 鉴定的机制为脑膜炎球菌病原体提供了关键的见解.
- 针对这种特定的宿主-病原体相互作用,为开发新型抗脑膜炎疗法提供了一个有希望的途径.
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