布鲁吉亚马拉伊的 filarial 虫衍生的细胞外囊泡抑制抗原呈现细胞功能和抗原特异性的 CD4+ T 细胞反应
Gayatri Sanku1, Alessandra Ricciardi1, Neelam R Redekar2
1Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health (NIH), Bethesda, MD, United States.
Frontiers in immunology
|October 22, 2024
概括
微菌衍生的细胞外囊泡 (EVs) 损害了人类抗原呈现细胞的功能,导致T细胞反应减少. 这项研究揭示了寄生虫虫的EV如何影响免疫细胞和T细胞效应器功能.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 寄生虫学的寄生虫学
背景情况:
- 活生生的微菌 (mf) 和它们的细胞外囊泡 (EVs) 调节人类抗原呈现细胞 (APC) 功能.
- 在LPS和干扰素马激活后,MF和EV抑制了在APC中的IL-12和其他促炎细胞因子的诱导.
研究的目的:
- 为了调查EV如何改变人类APC功能.
- 分析mf,mf衍生的分泌/分泌 (E/S) 产品和纯化的EV对人类单细胞衍生的树突细胞 (DCs) 的影响.
主要方法:
- 人类单细胞衍生的树突细胞 (DCs) 暴露于活的mf,mf衍生的E/S产品,E/S耗尽的EVs和纯化的EVs.
- 在暴露于各种mf衍生产品后,对DC进行了RNA测序 (RNAseq).
- 在使用EV和池激活DC调节后,评估了SARS-CoV-2特定的CD4+T细胞.
主要成果:
- 与未暴露的DC相比,暴露于EV的DC显示了212个差异表达基因 (DEG),富含中性粒细胞脱粒和溶酶体通路.
- DCs的EV条件降低了SARS-CoV-2膜特异性CD4+T细胞的频率及其产生IFN-γ的能力.
- IPA分析表明,暴露于EV的DC中存在免疫失调.
结论:
- 来自微菌的EV在APC功能中起着调节作用.
- EVs可能导致T细胞效应因子功能的缺陷,影响免疫反应.
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