在胚胎的左右不对称肠发育过程中,一种非典型的底层膜形成了中线屏障
Cora Demler1, John Coates Lawlor1, Ronit Yelin2
1Department of Molecular Medicine, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
bioRxiv : the preprint server for biology
|August 30, 2023
概括
背腔介质中的短暂的双底膜中间线结构通过将左侧和右侧的胚胎分开来引导肠道旋转和血管发育,防止模式缺陷.
科学领域:
- 发育生物学是发展生物学.
- 胚胎发生是胚胎发生.
- 有机体的产生.
背景情况:
- 正确的肠道形态发生依赖于胚胎肠道旋转,由背半肠 (DM) 左右 (LR) 不对称指导.
- 消化道的LR不对称性对于消化道的血管化和器官发育至关重要,但具体的分线仍然未被确定.
- 系统性LR不对称性需要中间线屏障 (例如,Lefty1+),并且对信号分离的器官特定机制不太了解.
研究的目的:
- 在胚胎小发育过程中识别分离左侧和右侧脊髓的中线结构.
- 调查这种中线结构在建立肠道和血管不对称性的作用.
- 确定中线对Netrin4 (Ntn4) 的抗性及其作为屏障的功能.
主要方法:
- 胚胎小背腔介质体的组织学分析.
- 免疫光染色用于识别底层膜组件.
- 功能性试验评估中线屏障特性和对Ntn4.4的反应.
主要成果:
- 在胚胎DM中发现了一种短暂的双底层膜中线结构.
- 这个中间线将左侧和右侧的DM分开,与肠道和血管不对称性建立相关.
- 鉴定到的中间线与其他DM底层膜不同的是,它能够抵抗Netrin4 (Ntn4) 的破坏.
结论:
- 一个新的中线结构,一个短暂的双底层膜,作为胚胎背腔介质中的关键边界.
- 这种非典型的中线屏障对于在发育中的肠道及其血管系统中建立和维持左右不对称至关重要.
- 中线对Ntn4的独特耐药性表明,在发育过程中在保护器官特异性模式方面发挥了特殊作用.
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