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相关概念视频

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
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相关实验视频

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Retroviral Infection of Murine Embryonic Stem Cell Derived Embryoid Body Cells for Analysis of Hematopoietic Differentiation
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血液形成是由TGFbeta通路的TIF1gamma和Smad4分支控制的.

Wei He1, David C Dorn, Hediye Erdjument-Bromage

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转录介质因子1gamma (TIF1gamma) 与Smad4竞争,以结合Smad2/3,影响细胞命运. 这种相互作用产生了不同的Smad2/3-TIF1gamma和Smad2/3-Smad4通路,以响应TGFbeta信号.

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科学领域:

  • 细胞和分子生物学 细胞和分子生物学
  • 信号传输 信号传输
  • 发育生物学 发展生物学

背景情况:

  • 组织平衡受转化生长因子-β (TGFbeta) 信号调节,该信号激活Smad转录因子.
  • 规范的TGFbeta通路涉及Smad4与受体酸化的Smads 2和3结合,形成转录调节复合体.

研究的目的:

  • 为了研究正规TGFbeta通路的潜在分支.
  • 为了确定Smad蛋白质对TGFbeta的反应中的新型相互作用.

主要方法:

  • 研究了转录介质因子1gamma (TIF1gamma) 与Smad2/3在各种细胞类型中的结合相互作用.
  • 分析了TIF1gamma和Smad4在人类造血干细胞/原始细胞TGFβ介导反应中的功能作用.

主要成果:

  • TIF1gamma选择性地与受体酸化的Smad2/3结合,与Smad4.4竞争.
  • 这种结合在TGFbeta刺激后,在造血细胞,介质细胞和上皮细胞中迅速而强烈地发生.
  • 在造血干细胞/原始细胞中,TIF1gamma调解TGFbeta诱导的分化,而Smad4则调解抗增殖效应.

结论:

  • 该TGFbeta/Smad路径分为两个互补的效应器臂:Smad2/3-TIF1gamma和Smad2/3-Smad4.
  • 这些独特的复杂物差异性地控制了造血细胞的命运,介导了分化或抗增殖反应.