Food Res Int:luxS基因对都柏林沙门氏菌生物膜形成和抗生素耐药性的影响

2018-04-03 MedSci MedSci原创

生物膜是细菌的共同体,用于保护细菌免受外部不利影响并增强细菌对抗生素和消毒剂的抗性。在这里,我们研究了葡萄糖和氯化钠对沙门氏菌血清型都柏林(S. Dublin)生物膜形成的调节作用。为了分析群体感应基因luxS的表达水平,我们创建了luxS敲除突变体。此外,研究人员还探究了野生型(WT)和突变株的抗微生物耐药性、疏水性和自诱导剂-2(AI-2)的活性。结果显示,葡萄糖对S. Dublin生物膜形成

生物膜是细菌的共同体,用于保护细菌免受外部不利影响并增强细菌对抗生素和消毒剂的抗性。在这里,我们研究了葡萄糖和氯化钠对沙门氏菌血清型都柏林(S. Dublin)生物膜形成的调节作用。

为了分析群体感应基因luxS的表达水平,我们创建了luxS敲除突变体。此外,研究人员还探究了野生型(WT)和突变株的抗微生物耐药性、疏水性和自诱导剂-2(AI-2)的活性。

结果显示,葡萄糖对S. Dublin生物膜形成来说并不是必需的,但当葡萄糖浓度超过0.1%时对生物膜形成具有抑制作用。NaCl在生物膜形成中是不可缺少的,并且在高浓度(> 1.0%)时也发挥抑制作用。生物膜形成后,WT和突变株都显示出明显的MIC增长。与其浮游生物型相比S. Dublin生物膜形态的抗生素(氨苄青霉素)抗性增加高达32768倍。然而,与抗生素测试中的WT菌株相比,S. Dublin luxS敲除突变体仅与WT菌株存在轻微的差异,尽管它显示出比WT菌株更好的生物膜形成能力。突变菌株也表现出比WT菌株更高的疏水性,这是与生物膜形成有关的特征。

由于由luxS基因编码的LuxS酶在AI-2合成中起重要作用,所以突变株中的群体感应自身诱导物-2(AI-2)的产量明显低于WT菌株。然而,WT菌株中有限的生物膜形成能力表明AI-2与S. Dublin生物膜形成不直接相关。此外,WT和突变株的基因表达分析揭示了与生物膜应激反应相关的基因的上调,并增强了luxS突变株的抗性,这可能为luxS基因在生物膜形成中的调节作用提供证据。

原始出处:


Ju X, Li J, et al., Effect of the luxS gene on biofilm formation and antibiotic resistance by Salmonella serovar Dublin. Food Res Int. 2018 May;107:385-393. doi: 10.1016/j.foodres.2018.02.039. Epub 2018 Feb 17.

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    2018-04-03 衣带渐宽

    学习

    0

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    2018-04-03 衣带渐宽

    学习

    0

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    2018-04-03 清风拂面

    谢谢分享学习

    0