膜排泄在Staphylococcus pseudintermedius临床分离物中的作用和调节
Elisa Rampacci1, Tommaso Felicetti2, Francesco Birettoni1
1Department of Veterinary Medicine, University of Perugia, via San Costanzo 4, Perugia 06126, Italy.
Veterinary microbiology
|June 3, 2025
概括
多种药物耐药性在Staphylococcus pseudintermedius与排泄过度表达有关. 抑制这些显示出协同效应,但没有完全恢复抗生素敏感性,这表明复杂的调节机制.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 抗微生物耐药性 抗微生物耐药性
背景情况:
- 排泄 (EP) 是斯塔菲洛哥克菌种类的关键. 在抗生素治疗期间的生存率.
- 在葡萄球菌中调节EP过度表达的机制尚未完全理解.
- 临床隔离物中的多药性耐药性 (MDR) 需要对EP功能进行研究.
研究的目的:
- 在临床孤立的Staphylococcus pseudintermedius中评估流出能力.
- 调查EP在MDR中的作用.
- 阐明EP表达的分子机制,并评估治疗抑制策略.
主要方法:
- 现型特征:乙化 (EtBr) MIC查,基于度的积累/排放测试,以及与排放抑制剂 (EPI) 的协同作用测试.
- 遗传分析:全基因组测序 (WGS) 和定量聚合酶链反应 (qPCR) 探索高排放的遗传基础.
- 分子类型:多部位序列类型 (MLST) 用于分类分离物.
主要成果:
- 在109个分离物中,有6个呈现出高表型排泄物,通过度测量证实 (斯皮尔曼rs= 0.886).
- 在EPI和抗生素 (EtBr,西普罗洛克萨,克林达米,氨醇) 之间观察到协同效应,但完全的敏感性没有恢复.
- 识别出了塑编码的EP基因 (qacG,qacH,tetK,smr,qacJ,msrA/B),表达方式可变;MFS-JC286_RS07290在所有基因中表达过度,MFS-JC286_RS11100/MFS-JC286_RS11015表达最高.
结论:
- 在Staphylococcus pseudintermedius中,高排泄与特定的EP基因和可变的表达模式有关.
- 转录调节,而不是上游突变,可能驱动高流量表型.
- 对转录调节剂的进一步研究是有必要的,以获得针对葡萄球菌MDR的新疗法.
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