内源性cathelicidin可以防止与Toxoplasma gondii相关的肝损伤
Yi Lin Tan1, Paloma Cavalcante1, Karina M Cirone2
1Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.
Infection and immunity
|February 23, 2026
概括
凯瑟利西丁可以保护人免受Toxoplasma gondii感染. 缺乏cathelicidin的小鼠表现出严重的肝损伤和炎症,这表明它在对抗这种寄生虫的宿主防御中起着至关重要的作用.
科学领域:
- 免疫学 免疫学 免疫学
- 寄生虫学的寄生虫学
- 传染性疾病 传染性疾病
背景情况:
- 毒素菌,由*Toxoplasma gondii* (Tg) 引起,与神经精神问题有关,对免疫功能低下的人和怀孕期间构成风险.
- 凯瑟利西丁是对宿主防御至关重要的抗微生物,但它们在像毒素等寄生虫感染中的作用尚未完全理解.
研究的目的:
- 为了研究内源性cathelicidin对*Toxoplasma gondii*诱导的肝损伤和全身炎症的保护作用.
- 为了阐明cathelicidin影响宿主对*Toxoplasma gondii*感染的反应的机制.
主要方法:
- 使用低毒性*Toxoplasma gondii* (ME-49菌株) 在野生型 (*Camp+/+*) 和缺少cathelicidin (*Camp-/-*) 的小鼠中的口腔感染模型.
- 评估临床表现,死亡率,肝损伤,促炎性细胞因子水平 (Ifn-γ,Tnf-α) 和大脑炎症.
- 在体外研究中,使用骨髓衍生的巨细胞来分析Toxoplasma gondii*挑战后的细胞因子释放.
主要成果:
- *Camp-/-*小鼠的死亡率明显高,严重的肝损伤 (死性肝炎),以及与Camp+/+*小鼠相比,促炎细胞因子度增加.
- 在cathelicidin缺乏的小鼠中观察到脑炎症增加和*Toxoplasma gondii*细胞生成.
- *Camp-/-*小鼠的巨细胞释放的Tnf-α水平更高,野生型小鼠感染后内源性cathelicidin水平增加.
结论:
- 内源性cathelicidin在肝损伤和由*Toxoplasma gondii*感染引起的系统性恶化方面发挥着关键的保护作用.
- 凯瑟利西丁通过降低促炎性细胞因子合成的调节,特别是Tnf-α,减轻*Toxoplasma gondii*引起的病理.
- 这些发现突出了cathelicidin作为一个潜在的治疗目标,用于管理毒素症并发症.
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