在培养细胞中结合复合体的发展
1Department of Pharmacology, Yokohama City University, School of Medicine, Urafunecho 2-33, Yokohama 232, Japan.
Development, growth & differentiation
|June 7, 2023
概括
这项研究揭示了Madin-Darby犬 (MDCK) 细胞如何形成细胞间结. 首先发展出desmosomes,其次是紧密的连接,在培养的细胞中形成一个完整的连接综合体.
科学领域:
- 细胞生物学 细胞生物学
- 历史学 历史学 历史学
- 生物化学 生物化学
背景情况:
- 细胞间连接对于组织完整性和功能至关重要.
- 了解它们在培养细胞中的形成,可以了解它们的发育过程.
- 马丁-达比犬 (MDCK) 细胞是研究表皮细胞生物学的一个成熟模型.
研究的目的:
- 在培养的MDCK细胞中超结构性地研究细胞间连接的顺序发展.
- 描述结点复合体形成的特定顺序和形态.
主要方法:
- 培养的MDCK细胞在复合后的不同时间点在现场固定.
- 对与单层平面垂直切割的断面进行了超结构分析.
- 样本通过使用甲-OsO4和OsO4进行固定,以进行比较的结构观察.
主要成果:
- 在3-4天内观察到脱体形成的早期迹象,包括细胞膜叠加和细胞外物质凝结.
- 德斯莫索姆的形成往往先于顶端紧密的结节的发展.
- 一个完整的结合综合体,包括紧密的结合点,中间的结合点,和desmosomes,从顶到基底 (中等到基层) 连续形成.
- 在甲-OsO4固定后,可以很早就能看到中间密集的desmosomes线,而OsO4固定则突出了侧臂状的投影.
结论:
- 这项研究揭示了MDCK细胞中细胞间连接形成的特定发育途径.
- 紧密结节,中间结节和脱体的顺序组装建立了上皮质屏障的功能.
- 不同的固定方法在接口开发过程中显示出不同的超结构特征.
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