Department of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University Jena, Jena, Germany.
Institute of Medical Microbiology, Jena University Hospital, Jena, Germany.
Immunology. 2022 May;166(1):47-67. doi: 10.1111/imm.13449. Epub 2022 Mar 9.
Staphylococcus aureus causes severe infections associated with inflammation, such as sepsis or osteomyelitis. Inflammatory processes are regulated by distinct lipid mediators (LMs) but how their biosynthetic pathways are orchestrated in S. aureus infections is elusive. We show that S. aureus strikingly not only modulates pro-inflammatory, but also inflammation-resolving LM pathways in murine osteomyelitis and osteoclasts as well as in human monocyte-derived macrophages (MDMs) with different phenotype. Targeted LM metabololipidomics using ultra-performance liquid chromatography-tandem mass spectrometry revealed massive generation of LM with distinct LM signature profiles in acute and chronic phases of S. aureus-induced murine osteomyelitis in vivo. In human MDM, S. aureus elevated cyclooxygenase-2 (COX-2) and microsomal prostaglandin E synthase-1 (mPGES-1), but impaired the levels of 15-lipoxygenase-1 (15-LOX-1), with respective changes in LM signature profiles initiated by these enzymes, that is, elevated PGE and impaired specialized pro-resolving mediators, along with reduced M2-like phenotypic macrophage markers. The cell wall component, lipoteichoic acid (LTA), mimicked the impact of S. aureus elevating COX-2/mPGES-1 expression via NF-κB and p38 MAPK signalling in MDM, while the impairment of 15-LOX-1 correlates with reduced expression of Lamtor1. In conclusion, S. aureus dictates LM pathways via LTA resulting in a shift from anti-inflammatory M2-like towards pro-inflammatory M1-like LM signature profiles.
金黄色葡萄球菌可引起与炎症相关的严重感染,例如败血症或骨髓炎。炎症过程受不同的脂质介质(LMs)调节,但金黄色葡萄球菌感染中其生物合成途径如何协调仍不清楚。我们发现金黄色葡萄球菌不仅在小鼠骨髓炎和破骨细胞中,而且在人类单核细胞衍生的巨噬细胞(MDMs)中明显调节促炎和炎症消退的 LM 途径,这些细胞具有不同的表型。使用超高效液相色谱-串联质谱的靶向 LM 代谢脂质组学显示,在体内金黄色葡萄球菌诱导的小鼠骨髓炎的急性和慢性阶段,大量生成具有不同 LM 特征谱的 LM。在人类 MDM 中,金黄色葡萄球菌升高了环氧化酶-2(COX-2)和微粒体前列腺素 E 合酶-1(mPGES-1),但降低了 15-脂氧合酶-1(15-LOX-1)的水平,这些酶分别引发了 LM 特征谱的变化,即升高 PGE 和降低特异性促解决介质,同时降低 M2 样表型巨噬细胞标志物。细胞壁成分脂磷壁酸(LTA)通过 NF-κB 和 p38 MAPK 信号通路模拟金黄色葡萄球菌对 MDM 中 COX-2/mPGES-1 表达的影响,而 15-LOX-1 的降低与 Lamtor1 表达的降低相关。总之,金黄色葡萄球菌通过 LTA 调节 LM 途径,导致从抗炎 M2 样向促炎 M1 样 LM 特征谱的转变。
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