相关实验视频
Updated: Jun 3, 2026

06:53
Quantification of γH2AX Foci in Response to Ionising Radiation
Published on: April 7, 2010
基因素H2AX依赖的GABA (A) 受体调节干细胞增殖的过程
Michael Andäng1, Jens Hjerling-Leffler, Annalena Moliner
1Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 171 77 Stockholm, Sweden.
Nature
|January 11, 2008
概括
通过GABA (A) 受体传递的胺黄油酸 (GABA) 信号控制干细胞的增殖. 这一途径独立于DNA损伤,调节干细胞数量和神经元后代,揭示了一个独特的增殖机制.
科学领域:
- 发展生物学 发展生物学
- 干细胞生物学 干细胞生物学
- 神经科学是一个神经科学.
背景情况:
- 干细胞自我更新对于发育和组织恒温至关重要,涉及受控的增殖和多效维护.
- 体细胞增殖通常由G1检查点调节,但胚胎干细胞可能缺乏这种控制.
- 破坏DNA的S/G2细胞周期检查点路径对于保持基因组完整性至关重要.
研究的目的:
- 调查胺黄油酸 (GABA) 信号在调节干细胞增殖中的作用.
- 阐明涉及GABA介导干细胞增殖控制的特定机制和途径.
- 为了比较干细胞中的增殖控制机制与体细胞中的增殖控制机制.
主要方法:
- 研究了胚胎干细胞 (ES) 和神经干细胞 (NCS) 中通过GABA(A) 受体进行自身蛋白/副蛋白GABA信号传递.
- 分析了GABA(A) 受体激活对细胞周期进展,特别是S相积累的影响.
- 检查了涉及S相检查点激酶和基因组变异H2AX的信号通路.
主要成果:
- 通过GABA (A) 受体传递自身蛋白/副蛋白GABA信号,负面控制ES细胞和NCS细胞的增殖.
- GABA (A) 受体的激活导致S相积累,减少增殖和减少神经元后代.
- 这种增殖控制独立于分化,亡和明显的DNA损伤而运作,涉及DNA损伤检查点路径.
结论:
- GABA信号传递是调节干细胞增殖的独特机制,特别是在ES和NCS细胞中.
- 这些发现突出了GABA (A) 受体和S/G2 DNA损伤检查点通路在控制干细胞数量的新作用.
- 这种机制从根本上不同于大多数体细胞的增殖控制,为干细胞生物学和发育提供了洞察力.
相关概念视频
DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Abnormal Proliferation
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...
Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Molecular Factors Affecting Cell Division
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...

