An electron-microscopic study of syncytium formation during early embryonic development of the freshwater planarian Bdellocephala brunnea
An electron-microscopic study of syncytium formation during early embryonic development of the freshwater planarian Bdellocephala brunnea
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淡水涡虫早期胚胎发育过程中合胞体形成的电子显微镜研究
DOI：
10.1007/bf00027590
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发表时间：
1991
期刊：
影响因子：
2.6
通讯作者：
T. Sakurai
中科院分区：
文献类型：
--
作者：
T. Sakurai
为了证实脊椎动物胚胎中的卵细胞和卵裂球影响周围的卵黄细胞形成合胞体的假设，用电子显微镜观察了1-8-细胞期的胚胎。在卵细胞和卵裂球的内质网的特殊区域内，从产卵到8细胞期，形成了大量大小不一的空泡，然后至少消失了四次，就像它们的内容物正在分泌一样。这些活性在8-细胞期明显减弱。卵细胞和卵裂球周围的卵黄细胞在产卵后不久聚集成一小团紧密接触的细胞，然后在4-细胞期后期融合，形成合体。卵细胞和卵裂球释放的空泡与卵黄细胞形成合胞体之间的关系表明，细胞融合可能是由空泡中含有的一种因子诱导的。
To substantiate the assumption that the egg cell and blastomeres in planarian embryos influence surrounding yolk cells to form a syncytium, embryos at 1- to 8-cell stages were examined by electron microscopy. Within special areas of the endoplasmic reticulum both in the egg cell and in the blastomeres, a large number of vacuoles of various sizes formed and then disappeared at least four times over the period from egg-laying through the 8-cell stage as if their contents were being secreted. These activities diminished markedly at the 8-cell stage. Yolk cells surrounding the egg cell and blastomeres were aggregated in close contact with one another in a small clump shortly after egg-laying, and then, late in the 4-cell stage, became fused, forming a syncytium. The correlation between release of vacuoles by the egg cell and blastomeres and the formation of a syncytium by the yolk cells indicate that the cell fusion could be induced by a factor contained in the vacuoles.