小鼠胚胎着床过程中滋养细胞的侵袭。

E M Bevilacqua, P A Abrahamsohn
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引用次数: 0

摘要

在小鼠妊娠第6,7和8天,用电子显微镜分析了滋养层细胞和母细胞之间的相互作用。特别强调了滋养细胞的吞噬活性和侵袭性。在妊娠第6天,滋养细胞与着床隐窝的上皮细胞、隐窝的基底层和抗子宫内膜蜕膜细胞接触。在怀孕的第7天和第8天,滋养细胞与抗泌体蜕膜细胞相互作用。巨滋养细胞吞噬上皮细胞、母血细胞和蜕细胞,尽管这些结构的吞噬模式不同。整个上皮细胞和血细胞都被摄入。上皮细胞变质,血细胞形态正常;蜕细胞在严重恶化后被摄入。植窝上皮和基底膜之间的滋养细胞突起似乎有助于上皮细胞的移位。滋养细胞对子宫内膜的侵袭始于滋养细胞在蜕细胞之间的渗透过程。两种细胞表面之间的接触可能非常紧密:滋养细胞和健康的蜕细胞之间形成粘附型连接和局灶性接触。滋养细胞摄取变质或破碎的细胞,并逐渐占据后者留下的空间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Trophoblast invasion during implantation of the mouse embryo.

The interaction between trophoblastic and maternal cells was analysed by electron microscopy on days 6, 7 and 8 of pregnancy, in the mouse. Special emphasis was given to phagocytic activity and invasiveness by the trophoblast. On the sixth day of pregnancy, the trophoblast cells are in contact with the epithelial cells of the implantation crypt, with the basal lamina of the crypt, and with cells of the antimesometrial decidua. On the seventh and eighth days of pregnancy, the trophoblastic cells interact with those of the antimesometrial decidua. The giant trophoblastic cells engulf epithelial cells, maternal blood cells and decidual cells although the pattern of phagocytosis of these structures differs. Both whole epithelial cells and blood cells were ingested. The epithelial cells were deteriorated whereas the blood cells had a normal morphology; the decidual cells were ingested following a severe process of deterioration. Processes of trophoblastic cells interposed between the epithelium of the implantation crypt and its basal lamina seem to contribute to the displacement of the epithelial cells. The invasion of the endometrium by the trophoblast begins with the penetration by processes of trophoblastic cells between the decidual cells. The contact between the surface of both cell types may be very close: adherens type junctions and focal contacts are formed between trophoblastic cells and healthy decidual cells. Trophoblastic cells ingest deteriorated or fragmented cells and gradually occupy the spaces left by the latter.

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