首页> 外文期刊>Cellular immunology >RahU: an inducible and functionally pleiotropic protein in Pseudomonas aeruginosa modulates innate immunity and inflammation in host cells.
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RahU: an inducible and functionally pleiotropic protein in Pseudomonas aeruginosa modulates innate immunity and inflammation in host cells.

机译:RahU:铜绿假单胞菌中的一种可诱导的功能性多效性蛋白,可调节宿主细胞的先天免疫力和炎症。

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The aim of this study was to define the functional role of a recently identified RahU protein from Pseudomonas aeruginosa in macrophages and its role in bacterial defense. Recombinant (r)-RahU had no significant effect on cell apoptosis or cell viability in human monocytic THP-1 cells. Gene expression array of murine macrophage cells (RAW 264.7) stimulated with LPS showed modulation of common transcripts (by r-RahU and predisone) involved in inflammation. Functional cellular analysis showed RAW cells incubated with r-RahU at 1.0-10 mug/ml (0.06-0.6 muM) inhibited accumulation of nitric oxide (NO) in the presence of LPS by 10-50%. The IC(50) of r-RahU (0.6 muM) was distinct from the known inhibitors of NO production: prednisone (50 muM) and L-NMMA (100 muM). r-RahU also significantly inhibited chemotactic activity of THP-1 cells toward CCL2 or chemotactic supernatants from apoptotic T-cells. These reports show previously unknown pleiotropic properties of RahU in modulating both microbial physiology and host innate immunity.
机译:这项研究的目的是确定最近鉴定的铜绿假单胞菌RahU蛋白在巨噬细胞中的功能作用及其在细菌防御中的作用。重组(r)-RahU对人单核THP-1细胞的细胞凋亡或细胞活力无明显影响。用LPS刺激的鼠巨噬细胞(RAW 264.7)的基因表达阵列显示出与炎症有关的常见转录物(通过r-RahU和predisone)的调节。功能性细胞分析显示,以1.0-10杯/毫升(0.06-0.6μM)的r-RahU孵育的RAW细胞在LPS存在下可抑制一氧化氮(NO)的积累10-50%。 r-RahU(0.6μM)的IC(50)与已知的NO生成抑制剂不同:泼尼松(50μM)和L-NMMA(100μM)。 r-RahU还显着抑制THP-1细胞对CCL2或来自凋亡T细胞的趋化上清液的趋化活性。这些报告显示了以前未知的RahU在调节微生物生理和宿主固有免疫性方面的多效性。

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