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来自Bacteroides fragilis的外膜囊泡含有编码和非编码的小RNA物种,可以调节肠道上皮细胞中的炎症信号

Aadil Sheikh¹, Colin Scano¹, Julia Xu¹

¹Department of Biology Baylor University Waco USA.

Journal of extracellular biology

|October 23, 2025

概括

来自Bacteroides fragilis的外膜囊泡 (OMV) 携带小RNA (sRNA),调节宿主免疫反应. 致病性ETBFOMV上的RNA抑制IL-8,而它们的去除则增强了免疫刺激.

科学领域:

微生物学微生物学
免疫学免疫学免疫学
分子生物学分子生物学

背景情况:

微生物组的改变会影响宿主生理学和免疫力.
外膜囊泡 (OMVs) 中的微生物衍生RNA可能会影响宿主免疫反应.
来自不同细菌菌株的OMV相关小RNAs (sRNAs) 在免疫中的特定作用在很大程度上是未知的.

研究的目的:

调查OMVs及其相关的sRNAs从致病性 (ETBF) 和共生性 (NTBF) 的作用 Bacteroides fragilis在调节肠道上皮细胞免疫反应.
描述ETBF和NTBFOMV之间的sRNA配置文件的差异,以及它们对Toll-like受体 (TLR) 激活和细胞因子产生的影响.

主要方法:

RNA测序 (RNA-seq),qRT-PCR和北方涂抹用于分析OMVs的sRNA含量.
报告细胞测试用于评估OMV治疗后的TLR激活 (TLRs2,3和7).
用OMV治疗肠上皮细胞系 (Caco-2,HT29-MTX) 并分析IL-8表达.

主要成果:

在ETBF和NTBF的OMV中确定了不同的sRNA配置文件,在ETBFOMV中丰富了特定的RNA.
OMVs激活了TLRs2,3和7并增加了肠上皮细胞中的IL-8表达.
在ETBFOMV上的RNA降解,但不是NTBFOMV,增强了IL-8刺激,表明extravesicularRNAs具有免疫抑制作用.

结论:

Bacteroides fragilis OMV携带sRNA,可以差异调节宿主免疫反应.
致病性ETBFOMV上的extravesicularRNAs对肠道上皮细胞产生免疫抑制作用.
与OMV相关的RNA在宿主微生物相互作用中具有双重作用,对病原和治疗有潜在的影响.

关键词:

这种细菌是 Bacteroides fragilis.在外膜囊泡中,外膜囊泡小小的RNARNA小小的RNARNA.

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