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相关概念视频

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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Somatic to iPS Cell Reprogramming01:29

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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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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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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...
481
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...
778
T Cell Types and Functions01:24

T Cell Types and Functions

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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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
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记忆CD4+T细胞在逐步激活过程中顺序重组它们的3D基因组.

Alexander I Ward1, Jose I de Las Heras2, Eric C Schirmer2

  • 1Institute of Immunity and Transplantation, Division of Infection and Immunity, University College London, London, United Kingdom.

Frontiers in cell and developmental biology
|February 28, 2025
PubMed
概括

记忆CD4+T细胞在对刺激的反应中表现出动态的3D染色体结构变化. 这些结构性转变是由细胞因子和共受体驱动的,这些细胞是基因表达反应的主要细胞.

关键词:
三维基因组组织3D基因组组织这就是Hi-C.在IL-2中,IL-2被认为是IL-2.增强者 促进者 互动.调节基因表达 调节基因表达记忆 CD4+ T 细胞原始化/脱原始化的基因.顺序性免疫激活系统

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科学领域:

  • 免疫学 免疫学 免疫学
  • 基因组学就是基因组学.
  • 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.

背景情况:

  • CD4+ T 细胞具有转录性可塑性,使其能够在激活状态和记忆状态之间进行过渡.
  • 了解染色体结构 (1D和3D) 如何支持这种可塑性至关重要.

研究的目的:

  • 为了评估一种用于初级免疫细胞的商用Hi-C套件.
  • 为了研究内存CD4+T细胞中的3D染色质结构动态.
  • 在不同的刺激条件下,将染色质变化与基因表达相关联.

主要方法:

  • 使用一个现场的Hi-C套件,带有不同数量的CD4+ T细胞.
  • 从刺激和非刺激的初级T细胞生成Hi-C和RNA-seq库.
  • 应用了不同的刺激条件:单独IL-2和组合TCR/CD28/IL-2刺激.

主要成果:

  • 通过不同的细胞输入号码实现了可比的Hi-C接触矩阵.
  • 观察到3D基因组组织的动态变化,包括拓相关域 (TADs).
  • 发现IL-2刺激诱导了显著的基因组组织变化,通过TCR/CD28联合刺激进一步增强.

结论:

  • 记忆CD4+T细胞中的3D染色体结构高度动态,对刺激有反应.
  • 刺激会诱导3D架构的顺序变化,可能会激发细胞进行基因表达.
  • TADs不是不变的,但在T细胞激活过程中会发生动态变化.