由tigecycline与线粒体核糖体结合引起的T细胞毒性
Qiuya Shao1,2, Anas Khawaja2, Minh Duc Nguyen2,3
1Department of Urology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
Nature communications
|May 1, 2025
概括
泰格环素是一种四环环素抗生素,通过抑制线粒体蛋白质合成,对人类T细胞具有高度毒性. 这项研究揭示了tigecycline的存在.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 药理学 药理学是指药理学的学科.
背景情况:
- 环素是蛋白质合成抑制剂,用于对抗细菌感染.
- 负责氧化酸化 (OXPHOS) 的线粒体与细菌线粒体有相似之处,并且可能是这些抗生素的目标.
- T细胞的激活和功能依赖于OXPHOS.
研究的目的:
- 研究针对核糖体的抗生素,特别是tigecycline对人类T细胞的影响.
- 阐明在T细胞中的tigecycline细胞毒性背后的分子机制.
主要方法:
- 在体外评估tigecycline对T细胞活力,增殖和激活的影响.
- 测量线粒体和细胞质翻译抑制.
- 分析线粒体呼吸链复杂表达的分析.
- 低温电子显微镜 (cryo-EM) 用于确定T细胞线粒体上的tigecycline结合点.
主要成果:
- 提格环素对人类T细胞表现出显著的细胞毒性.
- 观察到线粒体转化和线粒体呼吸链复合体I,III和IV表达的抑制.
- T细胞的激活和扩张受到限制.
- 冷EM检测显示tigecycline结合于T细胞线粒体上的三个不同的部位,包括基转移酶中心.
结论:
- 提格环素向人类的线粒体,导致T细胞功能障碍和细胞毒性.
- 确定的结合部位为tigecycline在人体细胞中的非标作用提供了结构基础.
- 这些发现提供了对四环素抗炎性能的洞察,并为未来的抗生素设计提供了信息,以最大限度地减少副作用.
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