糖溶解的HIF1α依赖性解抑制了瘤细胞的增殖
Andrés A Urrutia1, Claudia Mesa-Ciller1, Andrea Guajardo-Grence1
1Research Unit, Hospital of Santa Cristina, Research Institute Princesa (IIS IP), Autonomous University of Madrid, 28009 Madrid, Spain.
缺氧诱导因子-1α (HIF1α) 通过增加NADH/NAD+比率,减少乳酸分泌,令人惊地抑制糖解. 这种机制解释了HIF1α如何通过抑制细胞增殖作为瘤抑制剂,特别是在低酸盐环境中.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 在瘤学瘤学.
背景情况:
- 已知低氧诱导因子-1α (HIF1α) 影响细胞代谢,通常促进糖分解并减弱线粒体活动.
- 在透明细胞细胞癌中,HIF1α具有悖论的功能,通过抑制增殖,作为瘤抑制剂,尽管危害了葡萄糖分解.
研究的目的:
- 为了研究HIF1α在抑制瘤细胞中的糖解中的意想不到的作用.
- 阐明HIF1α抑制糖解和瘤细胞增殖的分子机制.
主要方法:
- 在有限的酸盐供应条件下,在各种瘤细胞类型中分析糖解流和乳酸盐分泌.
- 测量NADH/NAD+比率和评估糖甲基3-酸盐脱酶 (GAPDH) 活性.
- HIF1α活动与线粒体氧气消耗和细胞增殖率的相关性.
主要成果:
- 发现HIF1α在GAPDH步骤后特别抑制糖解,导致乳酸分泌减少.
- 这种抑制与HIF1α介导的线粒体呼吸衰减有关,这增加了NADH/NAD+比率.
- 较高的NADH/NAD+比率抑制了对NADH敏感的GAPDH酶的活性,特别是当pyruvate供应有限时.
- 这种HIF1α的抗糖解作用有助于抑制瘤细胞增殖.
结论:
- HIF1α通过增加NADH/NAD+比率,从而抑制GAPDH活性,产生抗糖解作用.
- 这种HIF1α的代谢调节在抑制瘤细胞增殖方面发挥着至关重要的作用,特别是在营养有限的瘤微环境中.
- 这些发现为HIF1α在某些癌症环境中的瘤抑制功能提供了新的分子解释.
更多相关视频
08:19Transfer of Manipulated Tumor-associated Neutrophils into Tumor-Bearing Mice to Study their Angiogenic Potential In Vivo
Published on: July 20, 2019
07:48Utilizing Functional Genomics Screening to Identify Potentially Novel Drug Targets in Cancer Cell Spheroid Cultures
Published on: December 26, 2016
相关概念视频
Adaptive Mechanisms in Cancer Cells
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Abnormal Proliferation
Cancer-Critical Genes II: Tumor Suppressor Genes
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
mTOR Signaling and Cancer Progression
The mTOR pathway or the...
Loss of Tumor Suppressor Gene Functions
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
Regulation of Angiogenesis and Blood Supply
