开发一种三种伤口模型,用于研究真菌-细菌相互作用和抗菌疗法
Stine Sørensen1, Lasse Kvich1,2, Yijuan Xu3
1Department of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark.
Biofilm
|February 10, 2025
概括
这项研究开发了一种使用细菌和真菌的新型慢性伤口模型. 菌Candida albicans保护了细菌免受银带的影响,这使得多微生物感染的治疗疗效复杂化.
科学领域:
- 微生物学 微生物学
- 伤口治愈研究研究 伤口治愈研究
- 生物膜科学 生物膜科学
背景情况:
- 慢性伤口是一个越来越令人担忧的问题,通常由弹性多微生物生物膜感染复杂化.
- 据估计,的存在,特别是Candida albicans,在多达23%的伤口中存在,但跨王国模型很少.
研究的目的:
- 开发和描述一种新的体外慢性伤口模型,其中包括细菌和真菌物种.
- 调查跨王国相互作用及其对抗微生物治疗疗效的影响.
主要方法:
- 使用Pseudomonas aeruginosa,Staphylococcus aureus和Candida albicans创建了一个三种伤口模型.
- 通过盘子计数,pH/氧气测量和共聚焦显微镜分析了物种间的相互作用.
- 该模型在使用银注入带治疗之前和之后进行了评估.
主要成果:
- 香菌对Pseudomonas aeruginosa和Staphylococcus aureus的银注入带产生了增加的耐受性.
- 抗菌治疗使微生物平衡从P. aeruginosa的主导地位转移到S. aureus的主导地位.
- 相聚焦显微镜揭示了与单个物种模型相比,三种模型中的生物膜架构发生了变化.
- 在三种模型中,注入银的带增加了pH值,并部分恢复了氧化.
结论:
- 这种新的跨王国伤口模型强调了慢性伤口中的真菌和细菌之间的复杂相互作用.
- 菌的存在可以显著影响细菌对抗微生物药物的耐受性,影响治疗结果.
- 了解这些相互作用对于开发针对多微生物慢性伤口感染的有效策略至关重要.
相关概念视频
01:28Gene Regulation in Microbial Communities: Quorum Sensing
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
01:15Antifungal Agents
Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...