通过TLR介导的侵略性诱导结构包括抗微生物和减弱细胞内细菌存活率
Anushree Bhatnagar1, Umesh Chopra2, Sebastian Raja3
1School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Maruthamala PO, Vithura, Thiruvananthapuram 695551, Kerala, India.
Molecular biology of the cell
|January 3, 2024
概括
巨细胞形成了类似攻击性诱导结构 (ALIS) 来对抗细菌. 阻止ALIS组装会增加细菌负担,从而揭示ALIS.
科学领域:
- 免疫学和细胞生物学
- 宿主-病原体相互作用
背景情况:
- 免疫细胞,特别是巨细胞,利用各种防御机制.
- 收费类受体 (TLR) 的激活触发了巨细胞中侵袭类诱导结构 (ALIS) 的组装.
- 之前的研究表明,TLR4信号调节p62/sequestome1,这是ALIS组装的关键组成部分,TLR4介导的自选择性地准ALIS.
研究的目的:
- 研究TLR介导的自和ALIS在对抗细菌感染的宿主防御中的作用.
- 阐明ALIS的结构组织和分子组成.
- 验证ALIS中发现的蛋白质的抗微生物特性.
主要方法:
- 巨细胞培养暴露于各种细菌.
- 针对p62的小干扰RNA (siRNA) 抑制ALIS组合.
- 用于超结构分析的3D超分辨率结构化照明显微镜 (3D-SR-SIM).
- 质谱 (MS) 分析以确定ALIS蛋白质成分.
- 验证蛋白质-ALIS和蛋白质-体关联.
主要成果:
- 在接触不同细菌后,ALIS会在巨细胞中组装起来,并与含有病原体的细胞体结合起来.
- 使用p62-特定siRNA抑制ALIS组装导致细菌负担增加.
- 超结构分析揭示了ALIS中p62,ubiquitin和LC3的有组织模式.
- 在ALIS中,MS确定了抗菌蛋白 (AMP),包括Bst2,IFITM2和IFITM3.
- 这些AMP被验证与ALIS和含有细菌的虫体有关.
结论:
- 通过TLR介导的自和ALIS在对抗细菌病原体的宿主防御中起着至关重要的作用.
- 艾利斯 (ALIS) 作为一个有组织的平台,用于招募和集中抗菌蛋白.
- 在ALIS中丰富AMP,便于它们的传递到体,限制细菌生长,并支持新型宿主防御功能.
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