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人类胚胎的支气管树:基于哺乳动物模型的检查
Sena Fujii1, Taiga Muranaka1, Jun Matsubayashi2
1Human Health Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Journal of anatomy
|August 21, 2023
概括
人类胚胎支气管树表现出对称的分支模式,反映成人肺部. 这种在发育早期建立的基本结构表明主要气道的遗传决定,环境因素影响了外围分支.
科学领域:
- 发展生物学 发展生物学
- 比较解剖学的比较.
- 人类胚胎学 人类胚胎学
背景情况:
- 之前的研究提出了支气管树对称性作为哺乳动物模型.
- 这种对称性对人类胚胎阶段的适用性需要研究.
研究的目的:
- 为了检查人类胚胎支气管树的对称性.
- 要确定基本的哺乳动物支气管树模型是否适用于人类胚胎.
- 为了确定遗传与环境对支气管分支模式的影响.
主要方法:
- 从41个人类胚胎样本 (3D支气管树的重建 (卡内基阶段16-23) 使用相对比X射线计算机断层扫描.
- 根据分支位置 (背部,腹部,中部,侧部) 和测量长度,对支气管进行标记.
- 计算对应的支气管的右向左比.
主要成果:
- 人类胚胎支气管树与交替的背部和侧面系统模式呈现对称性,直至细分支气管B9.
- 支气管的长度随着发育阶段 (卡内基阶段) 的增长而增加,而右至左的比率保持不变 (~1.0).
- 在亚细分支气管B10之后的外周分支显示出个体变异,与主要支气管的保存模式不同.
结论:
- 成年人的支气管分支结构的原型是在胚胎阶段形成和维持的.
- 叶状支气管和特定细分支气管 (B6,B8,B9,B10) 的形态似乎是基因决定的.
- 细分支气管B10后的外周气道形成可能更多地受到环境因素的影响,而不是遗传因素.
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