血红蛋白赋予了对等性菌感染的耐受性
Ana Ferreira1, Ivo Marguti, Ingo Bechmann
1Instituto Gulbenkian de Ciência, Oeiras, Portugal.
Cell
|May 3, 2011
概括
血红蛋白 (Hb) 通过诱导血红氧酶-1 (HO-1) 和调节T细胞来保护人免受严重的疟疾. 这为宿主提供了对菌感染的耐受性,即使寄生虫负载很高.
科学领域:
- 血液学 血液学 血液学
- 免疫学 免疫学 免疫学
- 传染性疾病 传染性疾病
背景情况:
- 血红蛋白 (Hb) 在疟疾流行地区提供了生存优势.
- 疟原虫感染导致疟疾,这是一个重大的全球健康问题.
- 实验性脑疟疾 (ECM) 是疟疾的一种严重并发症.
研究的目的:
- 阐明状Hb对实验性脑疟疾 (ECM) 进行保护的机制.
- 研究血氧酶-1 (HO-1) 和其相关途径在状Hb介导的疟疾耐受性中的作用.
- 探索状Hb对Plasmodium特异性T细胞反应的影响.
主要方法:
- 使用表达人类状血红蛋白的小鼠模型.
- 评估在感染Plasmodium后对实验性脑疟疾 (ECM) 的易感性.
- 分析氧酶-1 (HO-1) 的表达和Nrf2通路的参与.
- 评估Plasmodium特异性CD8 ((+) T细胞的激活和扩张.
主要成果:
- 带有形Hb的小鼠不受ECM的影响,无论寄生虫负载如何,这表明宿主耐受性.
- 甲Hb通过Nrf2通路在造血细胞中上调HO-1表达.
- 一氧化碳 (CO),一个HO-1副产品,通过限制自由血红蛋白积累,减轻了ECM病原性.
- 在Nrf2/HO-1通路的独立性下,Sickle Hb抑制了致病性CD8 (((+) T细胞的反应.
结论:
- Hb对严重疟疾有显著的保护作用,主要是通过诱导宿主耐受性.
- Nrf2/HO-1通路和CO生产是状Hb对ECM的保护作用的关键媒介.
- Hb还对T细胞产生免疫调节作用,有助于疟疾耐受性.
- 这些发现揭示了对状Hb在疟疾抵抗中的作用的关键分子见解.
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