细胞铁控制了宿主对疟疾的反应
Sarah K Wideman1, Joe N Frost1, Felix C Richter2
1MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom.
PLoS pathogens
|October 9, 2023
概括
宿主细胞缺铁会损害疟疾期间的免疫反应,增加寄生虫水平,但减少肝损伤. 这突出了铁.
科学领域:
- 免疫学 免疫学 免疫学
- 寄生虫学的寄生虫学
- 营养科学 营养科学
背景情况:
- 疟疾和铁缺乏是全球重要的健康问题,患病率重叠.
- 缺铁性贫血通过阻碍寄生虫生长,可以提供对疟疾的一些保护,但也会损害免疫功能.
- 除了疟疾贫血之外,宿主细胞缺铁对免疫细胞的具体影响还不清楚.
研究的目的:
- 为了研究受限细胞铁吸收对宿主免疫反应和疟疾感染期间疾病病理学的影响.
- 阐明宿主细胞铁可用性在平衡疟疾保护和病理学的作用.
主要方法:
- 使用了一种转基因小鼠模型 (TfrcY20H/Y20H),其转移素受体功能受损,限制了细胞铁内部化.
- 感染了Plasmodium chabaudi chabaudi AS的小鼠,并监测了寄生病,体重,贫血和免疫细胞功能 (增殖,细胞因子产生).
- 评估肝损伤和寄生虫封存,并对免疫细胞进行了ex vivo铁补充实验.
主要成果:
- 与野生类型小鼠相比,TfrcY20H/Y20H小鼠在疟疾感染期间表现出更高的峰值寄生病和更大的体重减轻.
- 尽管贫血的发展轨迹相似,但这些小鼠表现出先天性和适应性免疫反应受损,包括T细胞和B细胞增殖和细胞因子产生减少.
- 免疫细胞的细胞内在铁缺乏症通过ex vivo铁补充恢复功能得到证实.
- 值得注意的是,TfrcY20H/Y20H小鼠表现出减少的肝损伤,其特征是寄生虫封存减少和肝脏免疫反应减弱.
结论:
- 疟疾感染期间宿主细胞缺铁会抑制免疫反应,导致寄生虫负担增加.
- 尽管免疫抑制,有限的细胞铁可用性保护免受过度的肝脏组织损伤.
- 这些发现揭示了铁在调节保护性免疫和疟疾引起的病理之间平衡的复杂作用.
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