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人的肠道Bacteroides eggerthii表达了一种新的含有银河酸黄的脂质糖,具有较弱的免疫刺激性质

Marta Tiemblo Martín¹, Magali Coccimiglio², Emanuela Andretta¹

¹Department of Chemical Sciences and Task Force for Microbiome Studies, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy.

Carbohydrate polymers

|November 19, 2024

概括

研究人员详细介绍了来自肠道细菌Bacteroides eggerthii的脂多糖 (LPS) 的结构. 这种LPS弱点激活免疫信号,突出显示细菌结构如何影响宿主免疫力.

科学领域:

微生物学微生物学
免疫学免疫学免疫学
结构生物学结构生物学

背景情况:

脂多糖 (LPS) 是格拉姆阴性细菌的关键组成部分,影响健康和疾病.
人体肠道微生物群成员对LPS的结构和功能数据有限.

研究的目的:

从人类肠道细菌 Bacteroides eggerthii 1_2_48FAA中阐明LPS的完整结构.
为了研究B. eggerthii LPS.的免疫调节功能.

主要方法:

从B. eggerthii.中分离和结构性确定LPS.
在体外测试中使用人类细胞系来评估TLR4介导的信号传递.
在树突细胞上分析免疫细胞成熟标志物 (CD40,CD80,CD86).

主要成果:

B. eggerthii 1_2_48FAA产生一种R型LPS (脂质糖,LOS) 具有异质的四和五酸性脂质A和富含银酸的核心.
B. eggerthii LOS 是托尔类受体4 (TLR4) 信号传递的一个弱活性剂.
与Escherichia coli LPS.相比,观察到单细胞衍生的树突细胞成熟标志物的表达较低.

结论:

这项研究从人类肠道细菌对LPS提供了新的结构和功能洞察力.
细菌LPS结构显著调节宿主免疫反应,特别是TLR4激活和树突细胞成熟.

关键词:

细菌菌类的蛋了它们.我们的肠道微生物群.脂聚糖类糖化物脂聚糖类糖化物质谱测量质量谱测量核磁共振光谱法 (NMR) 是一种光谱法.

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