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相关概念视频

B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

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Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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Humoral Immune Responses01:36

Humoral Immune Responses

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相关实验视频

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Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice
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HMGB1配对LEF1以调节B细胞免疫力

Qiuyue Chen1,2, Ziyin Zhang2, Nanshu Xiang2

  • 1Clinical Molecular Immunology Center, Department of Immunology, School of Medicine, Yangtze University, Jingzhou, China.

JCI insight
|September 23, 2025
PubMed
概括

高流动性组盒子蛋白1 (HMGB1) 对于B细胞平衡和抗体产生至关重要. 它微调B细胞受体信号传递和actin组织,确保适当的免疫反应.

关键词:
细胞生物学 细胞生物学发展发展发展 发展发展免疫学 免疫学 免疫学信号传导传导是指信号的传导.

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科学领域:

  • 免疫学 免疫学 免疫学
  • 细胞生物学 细胞生物学

背景情况:

  • 分泌的高流动性组盒子蛋白1 (HMGB1) 影响了适应性免疫和细胞应激反应.
  • 在B细胞内HMGB1的特定功能在很大程度上仍未被探索.

研究的目的:

  • 调查HMGB1在外围B细胞平衡和幽默免疫中的作用.
  • 阐明HMGB1调节B细胞受体 (BCR) 信号和功能的分子机制.

主要方法:

  • 在B细胞中条件删除Hmgb1基因.
  • 对B细胞种群的分析,包括边缘区域B细胞和B1a细胞.
  • 对抗原特异性抗体反应的评估.
  • 研究BCR信号通路,CD21表达和淋巴细胞增强剂结合因子1 (LEF1) 水平.
  • 检查actin重组和MST1/DOCK8/WASP信号轴的情况.

主要成果:

  • 在B细胞中条件删除HMGB1,导致边缘区域B细胞扩大,B1a细胞减少.
  • B细胞特异性Hmgb1删除导致抗原特异性抗体反应受损.
  • HMGB1缺陷增强了近端和远端BCR信号,可能是由于CD21表达增加,降低了BCR激活值.
  • HMGB1损失与LEF1水平的降低和CD21转录的增加相关,因为HMGB1结合了Lef1促进体.
  • 通过抑制MST1/DOCK8/WASP通路,HMGB1限制了actin重组,影响了BCR集群和信号组招募.

结论:

  • HMGB1对于维持外围B细胞平衡和有效的幽默免疫是必不可少的.
  • HMGB1充当双重调节剂,控制B细胞激活值,无论是通过转录 (通过LEF1/CD21) 还是通过细胞骨 (通过活性动力学).
  • 这些发现凸显了HMGB1在优化BCR信号传输和B细胞功能的关键作用.