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相关概念视频

Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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.
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...

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相关实验视频

Updated: Jul 14, 2026

Murine Superficial Lymph Node Surgery
04:36

Murine Superficial Lymph Node Surgery

Published on: May 21, 2012

CD4+ T细胞帮助控制 CD8+ T细胞的记忆,通过 TRAIL介导的激活诱导的细胞死亡.

Edith M Janssen1, Nathalie M Droin, Edward E Lemmens

  • 1Division of Cellular Immunology, La Jolla Institute for Allergy and Immunology, 10355 Science Center Drive, San Diego, California 92121, USA.

Nature
|March 4, 2005
PubMed
概括

在启动过程中,CD4+ T细胞的帮助使CD8+ T细胞在再次遇到抗原时能够自主扩张,形成免疫记忆. 没有这种帮助,CD8+ T细胞会经历TRAIL介导的亡,突出了适应性免疫的新机制.

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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
  • 分子生物学分子生物学

背景情况:

  • CD4+ T 淋巴细胞为 CD8+ T 淋巴细胞的原始化提供了必要的"帮助",这是建立免疫记忆的关键因素.
  • 初始的CD8+T细胞在抗原再次遇到时表现出不同的命运:"辅助"细胞经历二次扩张,而"无助"细胞则没有.
  • 这些被编程的反应表明,在原始化过程中的指令信号决定了CD8+ T细胞后代的命运.

研究的目的:

  • 调查控制CD8+T细胞的二次反应的指令程序.
  • 阐明"辅助"与"无助"CD8+T细胞的差异扩张背后的机制.
  • 确定导致"无助"CD8+T细胞缺少二次扩张的分子媒介.

主要方法:

  • 在用CD4+T细胞帮助和不使用CD8+T细胞原始化后对CD8+T细胞反应的比较分析.
  • 在二次刺激时评估效应器功能和繁殖能力.
  • 研究亡途径,包括激活诱导的细胞死亡和 TRAIL 的作用.

主要成果:

  • "无助"的CD8+T细胞,在没有CD4+T细胞的帮助下进行原始化,在二次刺激时经历激活诱导的细胞死亡.
  • 这种亡主要由与瘤亡因子 (TNF) 相关的亡诱导配体 (TRAIL) 介导.
  • 相比之下",辅助"的CD8+T细胞保留了自主克隆扩张的能力.

结论:

  • TRAIL表达的调节是CD4+ T细胞控制CD8+ T细胞记忆生成的关键机制.
  • 这些发现揭示了一种新的分子途径,它控制了适应性免疫反应和CD8+T细胞命运.
  • 了解这个"教学计划"为增强基于T细胞的免疫疗法提供了洞察力.