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Updated: Sep 10, 2025

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages

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乳腺细胞的现象异质性影响与病原性沙门氏菌的相互作用

Christopher von Beek¹, Grisna I Prensa¹, Julia H M Andersson¹

¹Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden.

European journal of immunology

|August 21, 2025

概括

杆细胞亚型对沙门氏菌 Typhimurium 感染的反应不同. 托尔类受体 (TLR) 表达和颗粒含量的差异决定了结缔组织和粘膜性巨细胞 (MCs) 如何对抗细菌入侵.

科学领域:

免疫学
微生物学
细胞生物学

背景情况:

乳腺细胞 (MCs) 是阻碍组织中的关键免疫细胞,对微生物威胁作出反应.
MCs表现出一个两步激活机制,集成Toll-like受体 (TLR) 传感和III型分泌系统 (TTSS) 信号,用于对格拉姆阴性细菌的细胞因子反应.
MC亚型之间的表型异质性可能会影响它们与微生物的相互作用.

研究的目的:

研究不同小鼠巨细胞亚型 (连接组织MC和粘膜MC) 如何对Salmonella enterica Typhimurium (S.Tm) 产生反应.
阐明TLRs和谢尔格林在STM的MC反应中的作用.
将人类的LUVA MC对STM的反应与小鼠的MC进行比较.

主要方法:

培养小鼠MCs (依赖IL-3和CT-MCs) 和人类LUVAMCs.
通过细胞外和侵入性STM刺激MCS.
评估TLR表达 (TLR4,TLR2,TLR2/6) 和细胞因子的释放.
评估S.Tm细胞内殖民和赛格利的作用.

主要成果:

通过涉及TLR4和TLR2的两步激活,CT-MC对S.Tm有强烈的反应.
由于TLR表达低,M-MC对细胞外的S.Tm没有反应,但对侵入性细菌有反应.
在MC颗粒中的谢尔格利限制了STM殖民,但没有影响细胞因子的释放.
人类LUVAMC使用一种组合TLR2/6和TTSS信号的两步激活变体.

结论:

特定于MC亚型的TLR表达决定了对细胞外STM的反应.
谢尔格利辛影响细菌细胞内生存,独立于MC细胞因子分泌.
MC异质性允许对STM感染产生不同的免疫反应,影响宿主防御策略.

关键词:

沙门氏菌细胞因子反应细胞内细菌乳腺细胞血糖类药物

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