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Induction and Testing of Hypoxia in Cell Culture
Published on: August 12, 2011
通过低氧诱导因子1alpha稳定野生类型的p53
1Department of Cell and Cancer Biology, Medicine Branch, NCI, NIH, Bethesda, Maryland 20892, USA.
Nature
|April 16, 1998
概括
缺氧,或低氧,通过一种涉及缺氧诱导因子1-alpha (HIF-1alpha) 的机制诱导野生型p53基因表达. 这项研究表明,HIF-1alpha稳定了p53蛋白,导致其积累和激活.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生理学 生理学 生理学
背景情况:
- 缺氧 (低氧) 是野生型p53基因的一个关键生理诱导因子.
- 通过缺氧诱导p53基因的确切机制在很大程度上是未知的.
- 缺氧诱导因子1-alpha (HIF-1alpha) 被缺氧激活,并调节与低氧条件相关的基因.
研究的目的:
- 阐明缺氧诱导野生类型p53.3的机制.
- 调查HIF-1alpha在p53.3低氧诱导中的作用.
- 确定p53蛋白的HIF-1alpha介导稳定是否对低氧条件下的p53积累负责.
主要方法:
- 使用的低氧化学模仿剂:化和desferrioxamine.
- 采用突变细胞系缺乏HIF-1α诱导和HIF-1β淘汰胚胎干细胞.
- 进行了免疫沉试验,以检测HIF-1alpha和p53.3之间的蛋白质-蛋白质相互作用.
- 使用记者基因测试来评估p53的转录活性.
主要成果:
- 低氧,化和desferrioxamine治疗导致野生类型p53.3的积累.
- p53诱导依赖于HIF-1alpha,因为它在HIF-1alpha缺乏细胞中被废除.
- 发现HIF-1alpha与p53结合在一起,这表明直接相互作用.
- 在正常细胞中过度表达HIF-1alpha增加了p53-依赖的记者基因活性和内源的p53水平.
结论:
- 转录活性的野生型p53的低毒诱导是由HIF-1alpha.
- HIF-1alpha通过直接关联稳定了p53蛋白,在低氧条件下导致p53的积累.
- 这种机制突出显示了氧气感应与p53瘤抑制路径之间的关键联系.
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