沿前后轴的平面再生的分子逻辑
Yoshihiko Umesono1, Junichi Tasaki, Yui Nishimura
1RIKEN Center for Developmental Biology, Kobe 650-0047, Japan. umesono.yoshihiko@tokushima-u.ac.jp
Nature
|July 26, 2013
概括
平面再生依赖于细胞外信号相关激酶 (ERK) 和Wnt/β-catenin通路. 这些信号通路建立了前后极性,完善了托马斯·亨特·摩根 (Thomas Hunt Morgan) 关于再生的百年老假设.
科学领域:
- 发育生物学 发展生物学
- 再生医学是一种再生医学.
- 分子生物学分子生物学
背景情况:
- 平面生物表现出了显著的再生能力,能够从碎片中形成一个完整的生物体.
- 托马斯·亨特·摩根 (Thomas Hunt Morgan) 提出了"头部物质"和"尾部物质"的形态遗传梯度来解释这种能力,这一假设需要进一步验证.
- 身体多能干细胞驱动平面再生.
研究的目的:
- 调查平面再生背后的分子机制.
- 阐明细胞外信号相关激酶 (ERK) 和Wnt/β-catenin信号通路在前后轴建立中的作用.
- 改进和验证托马斯·亨特·摩根关于再生梯度的假设.
主要方法:
- 在Dugesia japonica的再生过程中分析ERK信号梯度.
- 研究努达雷克 (ERK信号输出) 和β-catenin活动的调节作用.
- 在Phagocata kawakatsui中进行比较研究,以确认信号机制的跨物种保护.
主要成果:
- 在前面的再生区域,ERK信号形成了梯度.
- 诺达雷克基因和后部β-catenin活动负面调节ERK信号,建立后部化.
- 证实后部β-catenin信号抑制了Phagocata kawakatsui的头部再生,支持跨物种相关性.
结论:
- ERK和Wnt/β-catenin信号通路为平面再生提供了一个框架.
- 默认情况下,ERK信号促进了头部规格,而后置信号则调节了这一过程.
- 这项研究验证并完善了摩根的假设,强调了信号通路在再生过程中建立身体轴极性的关键作用.
相关概念视频
Gastrulation
52.8K
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
52.8K
Neurulation
40.2K
Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the...
40.2K
Overview of Regeneration and Repair
4.8K
Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
Regeneration
All animals have varying degrees of...
Regeneration
All animals have varying degrees of...
4.8K
Whole Body Regeneration
3.6K
Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
3.6K
Neurogenesis and Regeneration of Nervous Tissue
2.1K
In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
2.1K


