相关实验视频
Updated: Jun 14, 2025

08:41
Investigating the Phagocytosis of Leishmania using Confocal Microscopy
Published on: July 29, 2021
3.8K
脂胺结合受体,CD300f,在巨细胞中介宿主入侵致病性和非致病性 rickettsiae
Oliver H Voss1, Imran Moin1, Hodalis Gaytan1
1Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA.
Infection and immunity
|May 1, 2025
概括
瑞克菌侵入巨细胞,使用酸胺 (PS) 结合CD300f受体. 阻止这种相互作用可以保护小鼠免受致命的感染,揭示CD300f是控制皮病的关键目标.
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:
- 瑞克菌是一种毒性关节动物传播的病原体,感染宿主细胞,包括巨细胞 (MΦ).
- 没有完全理解Rickettsia物种侵入宿主细胞,特别是MΦ的确切机制.
- 巨细胞在控制或屈服于瑞克菌感染方面发挥着至关重要的作用.
研究的目的:
- 为了阐明Rickettsia入侵巨细胞的机制.
- 为了研究细菌酸素 (PS) 和宿主CD300f受体在Rickettsia吞中的作用.
- 在体内评估针对CD300f介导入侵途径的治疗潜力.
主要方法:
- 使用来自野生类型 (WT) 和CD300f淘汰赛 (CD300f-/-) 小鼠的骨髓衍生巨细胞 (BMDMΦ).
- 使用致病性 (R. typhi,R. rickettsii) 和非致病性 (R. montanensis) 种类的BMDMΦ进行量化Rickettsia吞.
- 在WT和CD300f-/-小鼠中进行了体内感染研究,随后进行了细菌负担评估和收养转移实验.
主要成果:
- 与WT小鼠相比,在CD300f-/-小鼠中,Rickettsia物种被BMDMΦ吞没的数量显著减少.
- 细菌PS被确定为一种潜在的连接体,可以调解CD300f依赖的Rickettsia被巨细胞吸收.
- CD300f-/-小鼠表现出对致命的R. typhi和R. rickettsii感染的保护,在脏中减少了细菌负载.
- 收养转移研究证实,表达CD300f的MΦ对于控制病在体内至关重要.
结论:
- 这项研究确定了一种由细菌PS和巨受体CD300f介导的Rickettsia宿主细胞入侵的新机制.
- CD300f有助于巨细胞吞Rickettsia物种,在宿主防御中发挥关键作用.
- 针对CD300f介导的途径提供了一个潜在的策略,用于开发新的治疗方法来对抗严重的瑞克塞病.
相关概念视频
Intracellular Movement of Viruses and Bacteria
2.8K
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
2.8K
Immune Surveillance by NK Cells and Phagocytes
1.4K
Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
Natural Killer Cells: The Fast Responders
NK cells are large granular lymphocytes found in the blood and lymphatic system. These...
1.4K
Defense Against Bacterial Pathogens
1.4K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.4K
Receptor-mediated Endocytosis
104.2K
Overview
104.2K
IP3/DAG Signaling Pathway
11.9K
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
11.9K

