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相关概念视频

The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Target Cell Response to Hormones01:22

Target Cell Response to Hormones

Hormones intricately bind to receptors on the surface or within target cells, initiating a cascade of cellular responses.
Notably, the cellular response can be regulated by altering the number of receptors expressed in the cell. For example, prolonged exposure to elevated hormone levels results in a gradual decline or down-regulation in the number of receptors for that specific hormone on the cell surface. Conversely, in response to low hormone levels, cells may use up-regulation, producing an...
Physiology of Urine Formation01:24

Physiology of Urine Formation

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相关实验视频

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Development of an In Vitro Assay to Evaluate Contractile Function of Mesenchymal Cells that Underwent Epithelial-Mesenchymal Transition
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胸腺早期的事件会影响效应细胞和调节性T细胞的平衡.

Daniel J Pennington1, Bruno Silva-Santos, Tobias Silberzahn

  • 1Peter Gorer Department of Immunobiology, King's College London School of Medicine, Guy's Hospital, London SE1 9RT, UK. d.pennington@qmul.ac.uk

Nature
|December 27, 2006
PubMed
概括

调控T (Tr) 细胞发育受到CD4+CD8+T细胞原始体的影响. 这种相互作用在激素选择之前调节T细胞早期分化,影响效应细胞功能.

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科学领域:

  • 细胞免疫学 细胞免疫学
  • 免疫调节 免疫调节
  • 在T细胞发育过程中.

背景情况:

  • 对于调节性T (Tr) 细胞至关重要的Foxp3中的突变会导致免疫病理.
  • 目前的理解表明,Tr细胞从与高亲和度连接体相互作用的T细胞原始体在胆小板中发展.
  • 这项研究研究了Tr细胞发育中的替代调节机制.

研究的目的:

  • 研究CD4+CD8+T细胞原始体在调节T细胞分化中的作用.
  • 探索超越TCR-激动剂选择的Tr细胞发育机制.
  • 了解T细胞前体早期分化的跨调节影响.

主要方法:

  • 研究了小鼠马贝塔T细胞的分化.
  • 操纵了CD4+CD8+T细胞原始体的能力,以影响早期的玛贝塔T细胞原始体.
  • 分析了T细胞受体 (TCR) 介导的选择和Foxp3表达.

主要成果:

  • 限制CD4+CD8+T细胞原始体的影响,将玛贝塔T细胞分化转向了调节性表型.
  • 这一监管转换发生在没有对TCR中介选择产生重大影响的情况下.
  • 发现CD4+CD8+T细胞原始体能够调节早期TCR-alphabet+原始体的分化,使其在激素选择之前转化为Foxp3+Tr细胞.

结论:

  • T细胞原始细胞相互作用在塑造T细胞效应和调节细胞命运方面发挥着至关重要的作用.
  • 在常规激素选择之前,Tr细胞的发育受到涉及CD4+CD8+T细胞原始体的跨调节机制的影响.
  • 这些发现挑战了Tr细胞发育现有模型的完整性,并突出了新的调节途径.