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相关概念视频

Transcription Factors02:16

Transcription Factors

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...
General Transcription Factors01:30

General Transcription Factors

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...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

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 are of three kinds RI, RII, and RIII. The RI...
Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

Role Of Notch Signalling In Intestinal Stem Cell Renewal

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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相关实验视频

Updated: Jun 8, 2026

A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis
06:59

A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis

Published on: August 12, 2010

通过卡斯巴酶介导的GATA-1裂变来负调节红色素形成.

R De Maria1, A Zeuner, A Eramo

  • 1Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania 19107-5541, USA. rdemaria@lac.jci.tju.edu

Nature
|October 16, 1999
PubMed
概括

成熟的红细胞通过触发不成熟细胞上的死亡受体来负面调节红细胞的产生. 这导致卡斯巴酶介导的GATA-1的降解,这是一个关键的转录因子,影响了红细胞生成.

更多相关视频

Direct Induction of Hemogenic Endothelium and Blood by Overexpression of Transcription Factors in Human Pluripotent Stem Cells
08:14

Direct Induction of Hemogenic Endothelium and Blood by Overexpression of Transcription Factors in Human Pluripotent Stem Cells

Published on: December 3, 2015

Direct Lineage Reprogramming of Adult Mouse Fibroblast to Erythroid Progenitors
11:46

Direct Lineage Reprogramming of Adult Mouse Fibroblast to Erythroid Progenitors

Published on: December 14, 2018

相关实验视频

Last Updated: Jun 8, 2026

A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis
06:59

A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis

Published on: August 12, 2010

Direct Induction of Hemogenic Endothelium and Blood by Overexpression of Transcription Factors in Human Pluripotent Stem Cells
08:14

Direct Induction of Hemogenic Endothelium and Blood by Overexpression of Transcription Factors in Human Pluripotent Stem Cells

Published on: December 3, 2015

Direct Lineage Reprogramming of Adult Mouse Fibroblast to Erythroid Progenitors
11:46

Direct Lineage Reprogramming of Adult Mouse Fibroblast to Erythroid Progenitors

Published on: December 14, 2018

科学领域:

  • 血液学 血液学 血液学
  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学

背景情况:

  • 在缺氧期间,红血细胞的产生 (人造) 被人造蛋白 (Epo) 刺激.
  • 红色素形成的负面调节机制尚未得到充分理解.
  • 死亡受体在各种细胞类型中通过酶激活启动亡.

研究的目的:

  • 为了研究红色素形成的负调节.
  • 为了确定死亡受体和卡斯帕斯信号在红状腺发育中的作用.
  • 阐明成熟和不成熟红细胞之间的反调节机制.

主要方法:

  • 对不成熟的红状腺细胞的死亡受体表达的分析.
  • 用成熟的红红细胞或死亡受体连接体治疗红色素原体.
  • 评估GATA-1降解及其功能影响.
  • 对卡斯巴酶耐药的GATA-1突变体和卡斯巴酶抑制蛋白的表达.

主要成果:

  • 不成熟的红状腺细胞在成熟的红状细胞上表达死亡受体与连接体.
  • 暴露于死亡受体连接体会导致卡斯巴酶介导的GATA-1降解,损害红细胞发育.
  • 抗卡斯巴酶的GATA-1表达挽救了红状腺的扩张和分化.
  • 卡斯巴酶抑制或耐药的GATA-1在Epo剥夺时阻止了红色素形成阻塞.

结论:

  • 成熟的红细胞通过死亡受体向红色素原体提供负面反.
  • 转录因子GATA-1的卡斯帕酶介导裂变是这种反循环中的关键机制.
  • 这一途径代表了红细胞形成中的重要负控制,影响了红细胞的产生.