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相关概念视频

Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

1.3K
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...
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Antigen Processing Pathways01:31

Antigen Processing Pathways

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MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
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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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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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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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相关实验视频

Updated: Jan 12, 2026

Fabrication of Anisotropic Polymeric Artificial Antigen Presenting Cells for CD8+ T Cell Activation
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通过金属有机框架调节抗原处理,以偏向适应性免疫.

Ezra Cho1, Meredith A Davis1, Julia A Nowak1

  • 1Department of Biomedical Engineering, Boston University, Boston, MA 02215.

Proceedings of the National Academy of Sciences of the United States of America
|November 3, 2025
PubMed
概括

通过调整金属有机框架 (MOF) 孔径来控制纳米粒子疫苗抗原释放率,显著影响了适应性免疫力. 这种方法允许量身定制的免疫反应,提高疫苗的疗效和个性化保护.

关键词:
适应性免疫是一种适应性免疫.金属有机的框架.纳米规模的疫苗设计.

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科学领域:

  • 纳米技术在疫苗学中的应用
  • 免疫学和适应性免疫
  • 用于药物输送的材料科学.

背景情况:

  • 纳米粒子疫苗可以增强抗原吸收,但细胞内处理和释放动态尚不清楚.
  • 了解抗原释放对于优化疫苗诱导的免疫反应至关重要.
  • 金属有机框架 (MOFs) 提供可调节的特性,用于控制抗原输送.

研究的目的:

  • 研究MOF纳米颗粒调节抗原释放率如何影响适应性免疫.
  • 确定MOF孔径对细胞内抗原处理和T细胞反应的影响.
  • 通过控制的抗原释放动力学探索个性化疫苗设计的潜力.

主要方法:

  • 采用了两种不同孔径的MOF (NU-100x系列) 来进行卵蛋白 (OVA) 抗原加载.
  • 评估了由MOF孔径大小影响的抗原释放概况和细胞内处理.
  • 评估下游CD8 +,CD4 + T细胞增殖,细胞因子 (T_H1 / T_H2) 和抗体反应 (IgG) 在体内.

主要成果:

  • 使用卵胺的NU-1003显示出更高的CD8+:CD4+T细胞增殖和T_H1:T_H2细胞因子比率.
  • 卵胺载荷的NU-1000诱导了更强的抗原特异性IgG反应,包括更高的长期抗体产生和IgG1:IgG2a比率.
  • 与NU-1003相比,载有SARS-CoV-2受体结合域 (RBD) 的NU-1000表现出明显更高的IgG1:IgG2a比率和更广泛的表位识别.

结论:

  • 抗原释放率由MOF孔径大小调节,极大地影响疫苗诱导免疫的类型和程度.
  • 控制的抗原释放可以指导自适应性免疫反应,有利于T细胞介导免疫或抗体产生.
  • 这项研究为设计纳米粒子疫苗提供了一个框架,用于个性化免疫策略的可调节释放配置文件.