Acinetobacter baumannii LOS Regulate the Expression of Inflammatory Cytokine Genes and Proteins in Human Mast Cells.

Acinetobacter baumannii LOS Regulate the Expression of Inflammatory Cytokine Genes and Proteins in Human Mast Cells.
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DOI:
10.3390/pathogens10030290
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发表时间:
2021-03-03
期刊:
Pathogens (Basel, Switzerland)
影响因子:
--
通讯作者:
Ono Y
Ono Y
中科院分区:
其他
文献类型:
--
作者:
Kikuchi-Ueda T;Ubagai T;Kamoshida G;Nakano R;Nakano A;Ono Y

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在此,我们研究了鲍曼不动杆菌中的细菌脂寡糖 (LOS) 对促炎基因表达的影响,促炎基因在细菌清除中发挥着重要作用。 LAD2 人类肥大细胞用源自两种鲍曼不动杆菌菌株 ATCC 19606 和 MDRA T14 的 LOS 进行刺激。 LOS 暴露诱导促炎介质基因的表达,包括 TNF-α、IL-8、LTC4S、CCL4 和 TLR4。在鲍曼不动杆菌-LOS刺激的肥大细胞中,除TLR4外,大多数促炎基因的mRNA表达水平增加。此外,中性粒细胞与LOS(ATCC 19606和MDRA T14)诱导的LAD2细胞获得的上清液共培养增加了中性粒细胞的迁移,这在早期保护细菌感染方面发挥着关键作用。本研究的结果表明,LOS 可能通过肥大细胞诱导炎症反应参与鲍曼不动杆菌的致病性,而 IL-8 则参与招募中性粒细胞以应对细菌入侵。
Herein, we investigated the effect of bacterial lipooligosaccharides (LOS), from Acinetobacter baumannii, on the expression of pro-inflammatory genes that play an essential role in bacterial clearance. LAD2 human mast cells were stimulated with LOS derived from two strains of A. baumannii—ATCC 19606 and MDRA T14. LOS exposure induced the expression of genes for pro-inflammatory mediators, including TNF-α, IL-8, LTC4S, CCL4, and TLR4. The mRNA expression levels of a majority of the pro-inflammatory genes, except TLR4, in A. baumannii-LOS stimulated mast cells were increased. Moreover, co-culture of neutrophils with the supernatant obtained from LOS (ATCC 19606 and MDRA T14)-induced LAD2 cells increased the transmigration of neutrophils, which plays a critical role in the early protection against bacterial infections. The results of the present study suggest that LOS could be involved in the pathogenicity of A. baumannii by inducing inflammatory responses via mast cells and that IL-8 is involved in recruiting neutrophils in response to bacterial invasion.
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