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相关概念视频

Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
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Interactions Between Signaling Pathways

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相关实验视频

Updated: Jun 21, 2026

Molecular Analysis of Endothelial-mesenchymal Transition Induced by Transforming Growth Factor-β Signaling
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Published on: August 3, 2018

细胞质PML在TGF-β信号传递中的功能.

Hui-Kuan Lin1, Stephan Bergmann, Pier Paolo Pandolfi

  • 1Cancer Biology and Genetics Program, Department of Pathology, Memorial Sloan-Kettering Cancer Center, Sloan-Kettering Institute, 1275 York Avenue, New York, New York, 10021, USA.

Nature
|September 10, 2004
PubMed
概括
此摘要是机器生成的。

细胞质前兆细胞白血病 (PML) 蛋白调节转化生长因子β (TGF-β) 信号传输. PML对于TGF-β诱导的生长停止和亡是必不可少的,其缺乏会损害Smad蛋白的功能.

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科学领域:

  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学
  • 癌症研究 癌症研究

背景情况:

  • 转化生长因子β (TGF-β) 是一种关键的瘤抑制剂,但癌细胞往往会逃避它的作用.
  • 促细胞白血病 (PML) 蛋白质被称为瘤抑制剂,具有具有独特功能的核和细胞质异型.
  • 细胞质PML在TGF-β信号传递中的作用在很大程度上是未知的.

研究的目的:

  • 研究细胞质PML在TGF-β信号通路中的功能.
  • 为了确定细胞质PML是否调节TGF-β诱导的细胞反应.
  • 阐明PML与TGF-β信号元件相互作用的分子机制.

主要方法:

  • 使用Pml-null初级细胞来评估TGF-β反应.
  • 分析了Smad2和Smad3蛋白质的酸化和核转移.
  • 通过共免疫沉和细胞局部化研究,研究了PML,Smad2/3,SARA和TGF-β受体之间的物理相互作用.

主要成果:

  • Pml-null细胞表现出对TGF-β介导的生长停止,衰老和亡的抵抗力.
  • 在Pml-null细胞中观察到Smad2/3的酸化和核转移受损.
  • 细胞质PML在物理上与Smad2/3和SARA相互作用,促进Smad2/3-SARA复合体的形成和早期内基因组中的受体积累.
  • 治疗TGF-β诱导了细胞质PML的表达.
  • PML-RARalpha oncoprotein对抗细胞质PML功能,反映了APL细胞中的TGF-β信号缺陷.

结论:

  • 细胞质PML是TGF-β信号传递的关键调节者,对于调解其瘤抑制功能至关重要.
  • PML与Smad蛋白和受体贩运的相互作用对于有效的TGF-β通路激活至关重要.
  • 细胞质PML和TGF-β信号的失调有助于癌症的发病,特别是在APL.