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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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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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相关实验视频

Updated: Apr 9, 2026

Live Cell Imaging and 3D Analysis of Angiotensin Receptor Type 1a Trafficking in Transfected Human Embryonic Kidney Cells Using Confocal Microscopy
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鉴定了一种新型的氧化还原敏感基因Id3,该基因调解血管激素II诱导的细胞生长.

Cornelius Mueller1, Stephanie Baudler, Hilke Welzel

  • 1Klinik und Poliklinik Innere Medizin III, Universität des Saarlandes, Homburg, Germany.

Circulation
|May 22, 2002
PubMed
概括
此摘要是机器生成的。

ангиотензин II (Ang II) 通过超氧化物生产引起血管光滑肌肉细胞 (VSMC) 增殖,从而上调Id3. 抑制Id3阻断了这种生长,揭示了细胞控制中的新型氧化还原敏感途径.

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科学领域:

  • 心血管生物学 心血管生物学
  • 分子生物学分子生物学
  • 细胞信号传输 细胞信号传输

背景情况:

  • 反应性氧物种 (ROS),特别是超氧化物 (O(2) ((-),都与细胞异常生长有关.
  • ангиотензин II (Ang II) 是血管氧化应激的一个关键诱导因子.
  • 血管平滑肌细胞 (VSMC) Ang II诱导的增殖机制尚未完全理解.

研究的目的:

  • 阐明Ang II诱导的VSMC增殖背后的分子机制.
  • 识别参与VSMC生长控制的新型氧化还原敏感基因.

主要方法:

  • 用Ang II或丁/丁氧化酶 (X/XO) 治疗VSMC,以诱导氧化应激.
  • 用差异显示来分析基因表达.
  • 使用了基因沉默 (反意义Id3) 和过度表达 (意义Id3).
  • 评估了细胞循环调节者的蛋白质水平 (p21,p27,p53) 和视网母细胞瘤蛋白质酸化.

主要成果:

  • 格II和X/XO刺激了VSMC的DNA合成和扩散.
  • 一个新的氧化还原敏感基因Id3被确定并通过AngII和X/XO进行上调.
  • 超氧化物脱酶,但不是酶,抑制了Id3的上调.
  • 反感Id3消除了Ang II和X/XO诱导的VSMC扩散.
  • 格II和Id3调节了p21 ((WAF1/Cip1),p27 ((Kip1) 和p53的表达,以及视网母细胞瘤蛋白酸化.

结论:

  • 安格II通过超氧化物生产和随后的Id3上调促进VSMC的扩散.
  • Id3在调节下游细胞循环蛋白 (p21,p27,p53) 中起着至关重要的作用.
  • 这项研究揭示了一种新的氧化还原敏感途径,可以控制血管系统中的细胞生长.