使用光动力学无活化克服Candida albicans的耐药性
Gabriela Gomes Guimarães1,2, Jennifer Soares2, Anna Luiza Resende2
1PPGBiotec, Federal University of São Carlos, Sao Carlos, Brazil.
Photochemistry and photobiology
|May 15, 2025
概括
光动力学无活化 (PDI) 与安福特素B (AmB) 结合,有效地降低了Candida albicans的生长. 这种组合疗法,特别是在重复的PDI剂量下,显示出对抗抗真菌耐药性的承诺.
科学领域:
- 菌类学 菌类学是指菌类学.
- 摄影化学的使用.
- 抗菌疗法是一种抗菌疗法.
背景情况:
- 对安福特素B (AmB) 的耐药性增加需要新的抗真菌策略.
- 虫 Candida albicans 对免疫受损的个体构成重大威胁.
- 替代治疗对于管理C. albicans感染至关重要.
研究的目的:
- 评估光动力失活 (PDI) 和AmB对C. albicans的联合疗效.
- 评估PDI对酵母和C. albicans. 形菌的影响.
- 为了研究多次PDI剂量对抗真菌活性的影响.
主要方法:
- C. albicans 培养物 (酵母和) 用不同度的 AmB 处理,有或没有 PDI.
- 在PDI中使用了由450nmLED光 (15J/cm2) 激活的黄素 (2.5μM).
- 用光学密度测量真菌生长减少;通过FTIR光谱学评估生物分子变化.
主要成果:
- AmB和PDI组合实现了酵母的75%降低和形的87.5%降低.
- 两次PDI剂量显著增强了抗真菌功效,特别是对菌的功效.
- FTIR分析表明PDI对真菌生物分子的影响.
结论:
- PDI增强了AmB对C. albicans的抗真菌活性.
- 协同效应在抗药性形式 (如和生物膜) 上更为明显.
- 在临床环境中,PDI是克服抗真菌耐药性的有希望的策略.
相关概念视频
01:20Candidiasis
Candidiasis is a fungal infection caused by opportunistic species of Candida. It can affect various anatomical sites, including the skin, oral cavity, nails, and genitourinary tract. Among its forms, vaginal candidiasis is the most common type of mucosal infection. It typically results from the overgrowth of Candida albicans in the vaginal mucosa. Under normal conditions, C. albicans exists as a commensal organism within the vaginal microbiota, regulated by the dominance of lactobacilli, which...
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...