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在Cryptococcus neoformans感染期间招募多态核核细胞和骨髓衍生的抑制细胞

Joyce C Guimarães-DE-Oliveira¹, Israel Diniz-Lima¹, Idália M Ferreira-Dos-Santos¹

¹Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho, Avenida Carlos Chagas Filho, 373, 21944-970 Rio de Janeiro, RJ, Brazil.

Anais da Academia Brasileira de Ciencias

|April 17, 2025

概括

加密球菌新型人感染可以导致免疫抑制. 某些真菌菌株会招募由髓质衍生的抑制细胞 (MDSCs),抑制T细胞反应,削弱宿主防御.

科学领域:

免疫学免疫学免疫学
菌类学菌类学是指菌类学.
传染性疾病传染性疾病

背景情况:

菌病是一种真菌感染,经常影响免疫力低下的人,可以导致严重的脑膜炎.
克里普托科克斯新型菌的囊包括葡萄糖氧化 (GXM) 和葡萄糖氧化 (GXMGal) 聚糖.
GXM表现出抗炎性质,而GXMGal则是促炎性,影响宿主免疫反应.

研究的目的:

为了研究骨髓系衍生抑制细胞 (MDSCs) 在Cryptococcus neoformans感染中的作用.
为了确定不同的C. neoformans菌株是否对MDSC功能和免疫抑制有不同的影响.

主要方法:

使用不同的C. neoformans菌株 (B3501和CAP67) 诱导密码球菌.
在支气管支气管腔中MDSC积累的分析.
通过招募的MDSCs对T细胞增殖抑制的评估.
对MDSCs的编程死亡-连接体1 (PD-L1) 表达的评估.

主要成果:

两种B3501和CAP67菌株都诱导了粒细胞MDSC前体在肺部的积累.
由B3501菌株招募的MDSC抑制了T细胞的增殖,与CAP67菌株的MDSC不同.
在MDSC中观察到PD-L1表达,表明潜在的免疫抑制机制.

结论:

新形式的感染可能导致免疫抑制性MDSCs的招募.
在C. neoformans多糖体中,菌株特异性差异可能决定被招募的MDSCs的免疫调节效应.
在MDSCs上的PD-L1表达表明了C. neoformans免疫逃避的关键途径.

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