测量活菌体中的膜流动性揭示了细胞下侧变异和对菌膜扰乱的极选择性反应
ACS infectious diseases
|January 7, 2026
概括
在活细胞中直接测量了对抗生素耐受性至关重要的mycobacterial细胞外流动性. 研究人员发现,杆子比侧墙更流动,这种流动性会影响抗生素易感性.
科学领域:
- 微生物学 微生物学
- 生物物理学的生物物理.
- 细胞生物学 细胞生物学
背景情况:
- 菌根细菌细胞外对于抗生素,宿主免疫力和压力生存至关重要.
- 目前的模型表明,低膜流动性阻碍了抗生素的进入,但在活菌根菌中直接测量很少.
- 膜流动性对细胞过程至关重要,并且在所有生命领域都受到动态调节.
研究的目的:
- 开发和验证一种方法,用于直接测量细胞外流动性在活菌根菌中.
- 为了研究细胞外流动性如何随着亚细胞定位,抗生素治疗和遗传修饰而变化.
- 探索膜流动性模式与菌根菌中的抗生素敏感性之间的关系.
主要方法:
- 利用对环境敏感的探头C-Laurdan进行活细胞成像和流细胞计.
- 开发了一种新的细胞外标签方法,适用于各种真菌菌种,包括*M. smegmatis*和*M. tuberculosis*.
- 在不同的亚细胞部位和对抗生素暴露和遗传突变的反应中表现出流动性.
主要成果:
- 观察到显著的流动性差异:极点比侧墙更流动,旧极点比新极点更流动.
- 在子细胞分裂后表现出不平等的膜流动性,在影响极性生长的突变体中减少了不对称性.
- 菌膜的破坏改变了流动性模式,增加了对抗生素的敏感性,这表明流动性是预测标记物.
结论:
- 开发的方法允许直接评估活菌根细胞外流动性.
- 细胞外流动性在真菌菌体内是异质的,与生长特征和潜在的压力生存有关.
- 膜流动性特征可以作为抗生素易感性的预测指标,为治疗策略提供新的途径.
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