相关实验视频
Updated: Jul 9, 2025
08:46
A Neonatal Imaging Model of Gram-Negative Bacterial Sepsis
Published on: August 12, 2020
6.4K
失调的单细胞衍生巨细胞对新生儿B组菌的反应
Denho Ravi1,2, Erato Ntinopoulou1,2, Nessim Guetta1,2
1Clinic of Neonatology, Department Mother-Woman-Child, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland.
Frontiers in immunology
|November 30, 2023
概括
新生儿的巨细胞对B组链球菌 (GBS) 呈现出过度的细胞因子反应,可能导致严重的新生儿败血症. 婴儿的这种增强的免疫活动与成人反应形成鲜明对比,影响感染结果.
科学领域:
- 免疫学 免疫学 免疫学
- 新生儿健康 新生儿健康
- 微生物学 微生物学
背景情况:
- 乙组链球菌 (GBS) 是新生儿败血症的主要原因,对宿主-病原体相互作用的理解不完全.
- 巨细胞是对宿主防御GBS的关键免疫细胞,调节免疫反应.
- 了解新生儿和成人之间巨细胞反应的差异对于解决新生儿GBS感染至关重要.
研究的目的:
- 为了比较新生儿和成年人暴露于GBS的单细胞衍生巨细胞 (MDM) 的免疫反应.
- 研究激活状态如何影响MDM对GBS和其他微生物刺激的反应.
主要方法:
- 单细胞从带血 (新生儿) 和周围血液 (成年人) 中分离出来,分化为MDMs.
- 使用M-CSF,GM-CSF和IFNγ激活MDM,然后暴露于GBS COH1菌株.
- 评估了细胞因子的释放,细胞和杀死细菌.
主要成果:
- 新生儿MDM在GBS暴露时释放的IL-1β,IL-6,IL-10,IL-12p70和IL-23水平明显高于成年MDM.
- 其他细胞因子和化学因子 (例如TNF,IL-8) 的水平在新生儿和成年MDM之间是相似的.
- 新生儿和成年人MDMs在细胞化和杀死GBS在opsonized条件下表现出相似的效率.
结论:
- 新生儿MDMs过度产生促炎和抗炎细胞因子表明对GBS的免疫反应失调.
- 新生儿巨细胞的这种高反应性可能会导致新生儿GBS感染的严重程度和器官功能障碍.
- 对GBS的MDM反应与对细菌脂和脂聚糖的反应不同,突出显示了病原体特异性相互作用.
相关概念视频
01:31Defense 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
01:15Differentiation of Common Myeloid Progenitor Cells
3.2K
Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
3.2K
01:22Development of Immunocompetence
315
The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
315