Front Microbiol:脂磷壁酸抑制金黄色葡萄球菌生物膜形成

2018-04-01 MedSci MedSci原创

生物膜是细胞粘附于生物或非生物表面的微生物的聚集体,可引发各种传染病。金黄色葡萄球菌引起的感染,包括肺炎、心内膜炎和骨髓炎,通常与细菌定植和生物膜形成有关。尽管脂磷壁酸(LTA)参与生物膜形成,但LTA的具体作用尚不清楚。在这项研究中,我们证明从植物乳杆菌释放的LTA可以抑制金黄色葡萄球菌生物膜形成和聚集,而不影响金黄色葡萄球菌在各种体外和体内模型中的生长。植物乳杆菌LTA(Lp.LTA)也抑制金

生物膜是细胞粘附于生物或非生物表面的微生物的聚集体,可引发各种传染病。金黄色葡萄球菌引起的感染,包括肺炎、心内膜炎和骨髓炎,通常与细菌定植和生物膜形成有关。尽管脂磷壁酸(LTA)参与生物膜形成,但LTA的具体作用尚不清楚。

在这项研究中,我们证明从植物乳杆菌释放的LTA可以抑制金黄色葡萄球菌生物膜形成和聚集,而不影响金黄色葡萄球菌在各种体外和体内模型中的生长。植物乳杆菌LTA(Lp.LTA)也抑制金黄色葡萄球菌临床分离株(包括甲氧西林抗性株)的生物膜形成。值得注意的是,Lp.LTA不仅干扰金黄色葡萄球菌的生物膜形成,还可破坏了预先形成的生物膜。

机制研究表明,Lp.LTA抑制ica操纵子的表达,该操纵子负责产生金黄色葡萄球菌生物膜发育所需的关键分子聚-N-乙酰葡糖胺。Lp.LTA增加金黄色葡萄球菌自诱导剂-2的释放,有助于抑制金黄色葡萄球菌生物膜形成。此外,Lp.LTA处理增强了生物膜对各种抗生素和巨噬细胞的易感性。有趣的是,没有D-丙氨酸部分的Lp.LTA不能抑制金黄色葡萄球菌的生物膜形成。

总之,该研究表明LTA可抑制金黄色葡萄球菌生物膜形成,因此可用于预防和/或治疗由金黄色葡萄球菌生物膜引起的传染性疾病。

原始出处:


Ahn KB, Baik JE, et al., Lipoteichoic Acid Inhibits Staphylococcus aureus Biofilm Formation. Front Microbiol. 2018 Feb 27;9:327. doi: 10.3389/fmicb.2018.00327. eCollection 2018.

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    2018-09-14 sunylz
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    2019-02-01 xjy02
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