身体支持细胞限制了生殖系干细胞的自我更新,并促进了分化
A A Kiger1, H White-Cooper, M T Fuller
1Department of Developmental Biology, Stanford University School of Medicine, California 94305-5329, USA.
Nature
|October 26, 2000
概括
身体支持细胞通过确保不对称的分裂来调节干细胞数量. 这些细胞中的表皮生长因子受体功能损失干细胞自我更新和分化平衡.
科学领域:
- 发育生物学 发展生物学
- 干细胞生物学 干细胞生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 干细胞对于组织的维护和修复至关重要,需要精确调节自我更新和分化.
- 不对称的细胞分裂是干细胞种群维持自我更新和分化之间的平衡的关键机制.
- 周围体力支持细胞在调节干细胞行为,特别是生殖系干细胞中的作用尚未完全理解.
研究的目的:
- 研究体支持细胞在控制干细胞数量和行为的作用.
- 阐明体细胞调节干细胞自我更新与分化的机制.
- 为了确定Drosophila 皮肤上生长因子受体通路在这种调节中的参与.
主要方法:
- 在体支持细胞中对多索菲拉表皮生长因子受体 (EGFR) 的基因操纵.
- 对野生型和突变型Drosophila的生殖系干细胞数量和分裂模式的分析.
- 研究体支持细胞和生殖系干细胞之间的信号相互作用.
主要成果:
- 在体细胞中,多索菲拉EGFR的功能丧失导致了男性生殖干细胞自我更新与分化失衡.
- 这种干扰导致生殖系干细胞数量增加,表明对自我更新的控制受损.
- 有证据表明,体细胞中激活的EGFR信号传递对于维持正常的干细胞行为至关重要.
结论:
- 身体支持细胞通过EGFR信号传递等途径作为守护者,限制干细胞自我更新并确保适当的分化.
- 这项研究突出了关键的膜信号机制,即体细胞提供了阻止干细胞过度增殖的线索.
- 了解这种体质-胚芽细胞相互作用对于再生医学应用和理解干细胞恒温至关重要.
相关概念视频
Multipotency of Hematopoietic Stem Cells
3.1K
The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
3.1K
Source And Potency Of Stem Cells
5.0K
Stem cells are undifferentiated cells with extensive self-renewal properties that help them maintain their population during the fetal and adult stages of life. They can specialize in all cell types of the human body. However, their differential potential may vary and can be classified into five types. Stem cells can be (1) Totipotent, (2) Pluripotent, (3) Multipotent, (4) Oligopotent, and (5) Unipotent. Each stem cell has a specific origin; the fertilized egg or zygote is a totipotent cell and...
5.0K
Stem Cell Niche
5.0K
The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
5.0K
Maintenance of the ES Cell State
1.9K
The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
1.9K
Somatic to iPS Cell Reprogramming
2.1K
Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
2.1K
Cellular Differentiation
5.7K
How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
A zygote is a...
A zygote is a...
5.7K


