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在Candida albicans生物膜的低氧微环境中,形成中性粒细胞的反应
Magdalena Juszczak1,2, Aleksandra Brankiewicz1,2, Marcin Zawrotniak1
1Department of Comparative Biochemistry and Bioanalytics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland.
Frontiers in immunology
|May 7, 2025
概括
在Candida albicans生物膜中的缺氧促进中性粒细胞的生存,但抑制了像NET形成这样的关键功能. 抑制缺氧诱导因子1-α (HIF-1α) 部分恢复这些关键的免疫反应.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 细胞生物学 细胞生物学
背景情况:
- 菌生物膜会产生低氧的微环境,影响宿主免疫反应.
- 中性粒细胞对于对抗C. albicans感染至关重要,但生物膜诱导的缺氧对其功能的影响尚不清楚.
研究的目的:
- 研究C. albicans生物膜中缺氧对人类中性粒细胞功能的影响.
- 阐明缺氧诱导因子1-α (HIF-1α) 在调节真菌生物膜感染期间中性粒细胞反应中的作用.
主要方法:
- 人类中性粒细胞与C. albicans生物膜 (野生类型和ECM缺陷突变) 共同培养.
- 测量了细胞内缺氧,HIF-1α稳定,Mcl-1蛋白积累,ROS产生,NET形成和化学分泌.
- 用HIF-1α抑制剂 (LW6,PX478) 对中性粒细胞进行治疗,以评估缺氧信号传递的作用.
主要成果:
- 成熟生物膜中的中性粒细胞呈现渐进性缺氧,增加HIF-1α和Mcl-1稳定性,以及增加MIP-1β/IL-8分泌量,表明支持生存的表型.
- 成熟的生物膜抑制了NET的形成和ROS的产生,同时增强了脱粒化.
- 细胞外矩阵 (ECM) 组成调节了缺氧驱动的免疫反应.
- HIF-1α抑制部分恢复了NETosis和ROS的产生.
结论:
- 生物膜诱导的缺氧促进中性粒细胞的存活,但损害了关键的效应器功能.
- HIF-1α是真菌生物膜微环境中中性粒细胞适应的关键调节者.
- 准缺氧通路是一个潜在的治疗策略,可以增强对C. albicans感染的宿主防御能力.
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