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相关概念视频

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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Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

Role Of Notch Signalling In Intestinal Stem Cell Renewal

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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
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Renewal of Intestinal Stem Cells01:23

Renewal of Intestinal Stem Cells

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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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    调节性T细胞 (Tregs) 在对抗原的反应中分化,Treg衍生的T细胞受体 (TCRs) 更有效. 不同的抗原会引起不同的Treg表型,这表明有针对性的宽容疗法.

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    科学领域:

    • 免疫学 免疫学 免疫学
    • T细胞生物学T细胞生物学
    • 监管T细胞分化的规则

    背景情况:

    • 调节性T细胞 (pTregs) 的外周分化对于对食物和微生物等非自身抗原的免疫耐受性至关重要.
    • 在pTreg分化中,T细胞受体 (TCR) 识别与环境线索的作用尚不清楚.

    研究的目的:

    • 调查不同抗原和TCR起源对ptreg分化的影响.
    • 探索由自我,微生物和饮食抗原诱导的独特的pTreg表型.

    主要方法:

    • 在初级T细胞中利用基于CRISPR的TCR编辑.
    • 对大型TCR面板进行了体内选,以评估pTreg分化.
    • 分析了由各种抗原诱导的pTreg表型 (Helios+,RORγ+).

    主要成果:

    • 所有测试的抗原类 (自我,微生物,饮食) 诱导了pTreg分化.
    • 来自Tregs的TCRs在促进pTreg分化方面比传统T细胞 (Tconv) 的TCRs更有效.
    • 根据抗原类和TCR来源观察到不同的pTreg表型,与特定的抗原呈现细胞相关.

    结论:

    • 由Treg衍生的TCRs优先驱动宽容性细胞命运,突出了它们在治疗应用中的潜力.
    • 了解抗原特异性pTreg分化途径可以为开发新型宽容性疗法提供信息.