从左右组织器提取液体,揭示了破坏对称性所需的机械特性
Pedro Sampaio1, Sara Pestana1, Catarina Bota1
1CEDOC, Chronic Diseases Research Centre, NOVA Medical School. Faculdade de8 Ciências Médicas, Universidade Nova de Lisboa, Lisboa, Portugal.
eLife
|July 21, 2023
概括
脊椎动物的左右身体不对称是通过左右组织器 (LRO) 内的流体动力学来建立的. 这项研究显示了斑马鱼胚胎.
科学领域:
- 发展生物学 发展生物学
- 生物物理学的生物物理.
- 胚胎学 胚胎学
背景情况:
- 脊椎动物的左右身体轴不对称性对于器官的定位至关重要.
- 左右组织器 (LRO) 中对称性破坏的确切机制仍在争论中,涉及化学传感或机械传感线索的理论仍然存在.
- 在LRO中的移动毛产生流体流动,但其在对称性破坏中的作用尚未完全阐明.
研究的目的:
- 为了研究流体动力学在斑马鱼LRO中的左右对称性破坏中的作用.
- 为了确定对称性破坏所需的关键时间窗口和流动特征.
- 在LRO流体介导的对称性破坏中区分化学信号和机械信号.
主要方法:
- 在活生生的斑马鱼胚胎中开发了用于LRO液体提取和操纵的新技术.
- 精确定时的液体提取以确定对称性破坏的关键窗口.
- 操纵LRO流体粘度和成分以评估对横向性的影响.
主要成果:
- 确定了对称性破坏的关键一个小时窗口,其特点是逆时针方向的流体流动.
- 证明了胚胎在提取后重新填充和重新循环LRO液体的能力.
- 发现较低的前方角速度和减少的前后异质性与横向性缺陷相关.
- 表明改变液体粘度,而不是其化学成分,诱导了横向性缺陷,突出了机械敏感性.
结论:
- 斑马鱼LRO的左右对称性破坏主要取决于流体动力学和机械感应线索,而不是特定的化学成分.
- 流体流动力学,特别是前后异质性,对于建立体轴不对称性至关重要.
- 斑马鱼胚胎在维持LRO功能和流体动力学方面表现出了显著的可塑性.
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