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插入序列介导的菌体耐药性有助于在肠道中减弱细胞分解性Enterococcus faecalis变体的殖民

Jumpei Fujiki^1,2, Tomohiro Nakamura^1,2,3,4, Henriette Kreimeyer¹

¹Department of Medicine, University of California San Diego, La Jolla, California, USA.

Microbiology spectrum

|April 15, 2025

概括

菌体治疗可以消除有害的肠道细菌,如Enterococcus faecalis. 菌根耐药变种可能出现,但表现出减少的肠道殖民和胆盐耐药性,可能改善酒精相关性肝炎的治疗结果.

科学领域:

微生物学和病毒学
肠道微生物组研究研究
菌体治疗应用菌体治疗应用

背景情况:

菌体疗法提供精确的肠道微生物群编辑,Enterococcus faecalis消除显示出对乙醇诱导的肝病的承诺.
菌素耐药变体是对菌素治疗疗效的担忧.
了解耐药机制对于成功的菌体治疗至关重要.

研究的目的:

为了研究细胞分解性Enterococcus faecalis临床隔离物中的菌体耐药机制.
评估菌素耐药性对细菌健康和殖民性的影响.
评估菌素耐药变异在与酒精相关的肝炎治疗中的潜在临床影响.

主要方法:

在感染特定菌体 (ΦEf2.1 和 ΦEf2.2) 后,对菌体耐药的Enterococcus faecalis变体的隔离和表征.
全基因组测序以识别与菌素耐药性相关的遗传突变和缺失.
在小鼠体内殖民研究和在实验室中测试胆汁盐耐药性和肠道细胞粘附性.

主要成果:

隔离了对菌体耐药的变种 (R-EF01),具有对 ΦEf2.1 和 ΦEf2.2.2 的独特耐药性.
基因分析显示IS256介导的xylA和epaR突变的破坏,以及染色体缺失和耐药分离物中的galE损失.
R-EF01变种显示显著减弱了肠道殖民,减少了胆盐抵抗力,减少了对肠道细胞的粘附性.

结论:

在细胞分解性Enterococcus faecalis.中,IS256在菌体耐药性中起作用.
涉及表面分子变化的菌体耐药机制 (例如,Epa生物合成) 可以降低病原体的适应性.
矛盾的是,某些菌素耐药变体的出现可能通过促进它们自己的快速消除,从而为有利的临床结果做出贡献.

关键词:

细菌菌体是一种菌体.细胞聚变酶 (cytolysin) 是一种健身费用健身费用健身费用肠 - 肝轴肠 - 肝轴微生物组的编辑菌体疗法是一种菌体疗法.贸易权衡 - 贸易权衡

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