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相关概念视频

Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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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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Cross-reactivity00:42

Cross-reactivity

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Overview
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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...
862
Tumor Immunotherapy01:27

Tumor Immunotherapy

450
Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Antigen Presenting Cells01:22

Antigen Presenting Cells

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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
1.6K
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: May 20, 2025

Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation
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基于STING激动剂的ER向分子促进抗原交叉呈现

Xiafeng Wang1,2, Zhangping Huang2, Lixiao Xing3

  • 1Department of Laboratory Medicine, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.

Nature
|March 27, 2025
PubMed
概括

研究人员开发了基于STING激动剂的ER向分子 (SABER),以增强CD8+T细胞的反应. 这种新型的输送系统向细胞内膜网,提高了疫苗对瘤和感染的疗效.

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科学领域:

  • 免疫学
  • 疫苗学
  • 分子生物学

背景情况:

  • CD8+ T细胞的反应对抗感染和瘤至关重要.
  • 树突细胞内细胞 (ER) 中的抗原交叉呈现是 CD8+ T 细胞诱导的关键.
  • 目前的抗原输送方法缺乏亚细胞精度,特别是细胞质到ER通路.

研究的目的:

  • 开发一种针对抗原的新型ER传递系统.
  • 通过精确的亚细胞传递来增强CD8+ T细胞免疫反应.
  • 调查开发系统的辅助性质.

主要方法:

  • 开发基于STING激动剂的ER向分子 (SABER).
  • SABER与各种抗原 (瘤新抗原,病毒表位) 的结合.
  • 在临床前模型中评估CD8+T细胞诱导和免疫反应.
  • 在SARS-CoV-2亚单元疫苗模型中评估SABER的辅助作用.

主要成果:

  • SABER有效地将抗原输送到急诊室, 形成微反应器.
  • 与SABER的结合显著增强了CD8+ T细胞对瘤和病毒抗原的反应.
  • 与传统辅助剂或抗原/激动剂混合物相比,SABER的疗效更高.
  • SABER 作为一种强有力的辅助剂,可以改善SARS-CoV-2 疫苗中和抗体反应.

结论:

  • SABER是一个高亲和度的ER向输送系统和疫苗辅助剂.
  • 精确的亚细胞传递到ER的交叉呈现机制使疫苗设计取得了重大进展.
  • 这种方法在诱导强大的CD8+T细胞介导免疫力方面提供了定性飞跃.