从Akkermansia muciniphila和致病细菌衍生的内毒素不同调节人类树突细胞的产生和gδT淋巴细胞激活
Veronica Fertitta1, Barbara Varano2, Manuela Del Cornò2
1Department of Environment and Health, Istituto Superiore di Sanità, 00161 Rome, Italy.
Biomolecules
|January 8, 2025
概括
慢性低水平的内毒素暴露从致病性细菌损害免疫细胞,增加疾病的风险. 然而,益生菌Akkermansia muciniphila支持免疫功能,突出其潜在的健康益处.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 炎症研究 炎症研究
背景情况:
- 脂多糖 (LPS) 是一种强大的内毒素,可触发炎症反应.
- 慢性低度炎症来自与失生症相关的LPS与非传染性疾病有关.
- 树突细胞 (DCs) 在调节免疫耐受性和激活方面至关重要.
研究的目的:
- 为了比较来自致病性和益生菌细菌的低剂量LPS对人类树突细胞 (DC) 功能的影响.
- 研究Akkermansia muciniphila LPS对DCs的免疫调节作用.
- 了解低内毒素与疾病风险和免疫健康相关联的机制.
主要方法:
- 人类单细胞衍生的DCs是以低度的LPS从大肠杆菌,沙门氏菌和Akkermansia muciniphila.
- 分析了DC分化,细胞因子释放 (IL-6,IL-10),PD-L1表达和T细胞激活能力.
- 进行TCR-Vδ2 T细胞激活试验以评估DC免疫刺激潜力.
主要成果:
- 致病性LPS (大肠杆菌,S. enterica) 诱导了PD-L1在DCs上的表达,增加了IL-6和IL-10的释放,并影响了T细胞的激活.
- Akkermansia muciniphila LPS促进了DC产生,并保留了激活潜力和免疫刺激特性.
- 低剂量致病性LPS倾斜DCs向一个宽容的表型,抑制T细胞的反应.
结论:
- 来自病原性细菌的低水平内毒素会导致免疫抑制性DCs,可能导致慢性炎症和疾病.
- Akkermansia muciniphila LPS表现出明显的免疫调节作用,保持DC功能并促进免疫激活.
- 这些发现阐明了低内毒性病对健康影响的机制,并突出了Akkermansia muciniphila有益的免疫调节作用.
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