人类真菌感染的细胞外囊泡:免疫反应的关键因素
Caroline P de Rezende1, Patrick W S Santos1, Renan A Piraine1
1Department of Biochemistry and Immunology, Ribeirao Preto Medical School University of Sao Paulo Ribeirao Preto São Paulo Brazil.
Journal of extracellular biology
|August 29, 2025
概括
来自患者样本的真菌细胞外囊 (EV) 含有宿主和真菌分子. 这些EV促进了促炎性免疫反应,表明它们有助于真菌疾病,并可能提供治疗点.
科学领域:
- 菌群学
- 免疫学
- 生物化学
背景情况:
- 真菌感染导致严重的死亡率,并因诊断挑战和抗真菌耐药性而复杂化.
- 细胞外囊泡 (EVs) 介导真菌与宿主之间的相互作用,但它们在人类感染中的作用尚不清楚.
- 关于真菌EVs在全身真菌病中的作用的临床数据有限.
研究的目的:
- 在患有侵袭性真菌感染的患者的临床样本中分析真菌EV.
- 为了确定真菌EV的分子组成.
- 研究真菌EV对宿主免疫细胞的免疫调节作用.
主要方法:
- 从Candida albicans,Cryptococcus neoformans和Paracoccidioides brasiliensis引起的感染患者的血清和尿液中分离出的EV的分析.
- 质谱测量以确定真菌EV中的关键代谢物,包括固醇,脂和脂肪酸.
- 胆固醇和厄戈斯特醇的量化,以确认宿主和真菌EV的存在.
- 使用小鼠和人类巨细胞进行体外研究,以评估对真菌EV的免疫反应.
主要成果:
- 已确定醇,脂和脂肪酸是真菌EV的主要组成部分.
- 在临床样本中通过量化胆固醇和厄戈斯特醇确认了宿主和真菌EV的存在.
- 在暴露于真菌EV的巨细胞中观察到一种促炎反应,其表现为细胞因子 (TNF-α,IFN-γ,IL-6) 和iNOS基因表达的增加.
- 证明真菌EVs可以诱导M1巨类型.
结论:
- 系统性真菌病患者的循环真菌EV是复杂的,包含宿主和病原体衍生的分子.
- 通过调节宿主对炎症的免疫反应,真菌EVs有助于疾病病理生理学.
- 这些发现凸显了真菌EV作为潜在的诊断生物标志物和侵袭性真菌感染的治疗点.
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