Open AccessJournal Article
Ultrastructure of the blastocyst and endometrium of the roe deer (Capreolus capreolus) during delayed implantation.
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TLDR
Transmission electron microscopy of the trophoblast cells during diapause revealed an abundance of electron-dense, membrane-bound granular inclusions and a marked lack of cytoplasmic organelles.Abstract:
Transmission electron microscopy of the trophoblast cells during diapause revealed an abundance of electron-dense, membrane-bound granular inclusions and a marked lack of cytoplasmic organelles. The cells also possessed a well-developed covering of branched microvilli, numerous caveolae, micropinocytotic vesicles and a lamina of fine fibrillae. The progressive enlargement of the blastocyst during diapause was correlated with a decline in the height of the trophoblast cells and a reduction in the density of microvilli and caveolae associated with the outer membrane. The granular inclusions also declined in number and electron density during the delay phase, suggesting the progressive utilisation of energy reserves. Embryonic elongation was associated with the disappearance of the granular inclusions, a reduction in the amount of fibrillar material and a dramatic increase in the development of cytoplasmic organelles. During diapause, clear vesicles, apparently derived from the Golgi apparatus, gradually accumulated in the supranuclear region of each gland and non-ciliated duct cell. Embryonic elongation was associated with the sudden release of these vesicles into the glandular lumen and thence into the uterine lumen. Numerous apical protrusions were also observed projecting from the luminal and ductal epithelia at this time, suggesting the formation of an apocrine secretion. Another type of secretion was produced during the early stages of placental attachment by the hypertrophied granular endoplasmic reticulum of the ductal epithelium.read more
Citations
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Embryonic diapause and its regulation.
TL;DR: Regulation of proliferation in non- mammalian models of diapause provide clues to orthologous genes whose expression may regulate the reprise of proliferation at the blastocyst stage in the mammalian context.
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Embryonic diapause in vertebrates
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Mismatch between birth date and vegetation phenology slows the demography of roe deer.
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Conceptus attachment in the ewe: an ultrastructural study.
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Pinopodes: a questionable role in endometrial receptivity
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References
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Journal ArticleDOI
Delayed implantation in roe deer (capreolus capreolus)
TL;DR: The results presented in this paper indicate that delayed implantation in the roe deer is due to a lack of certain essential factors which are needed to induce and support the process ofembryonic growth.
Journal ArticleDOI
Histological and ultrastructural changes in the blastocyst and reproductive tract of the roe deer, Capreolus capreolus, during delayed implantation.
Journal ArticleDOI
Electron microscopy of the pig's placenta, with especial reference to the cell-membranes of the endomentrium and chorion†
Edward W. Dempsey,Edward W. Dempsey,Edward W. Dempsey,George B. Wislocki,George B. Wislocki,George B. Wislocki,Emmanuel C. Amoroso,Emmanuel C. Amoroso,Emmanuel C. Amoroso +8 more
Journal ArticleDOI
An electron microscope study of the gland cells of the mink endometrium.
TL;DR: It is suggested that gland cells in the postimplantation and pseudopregnancy stages exhibit evidence of greater secretory activity than those in the delayed implantation stage.
Journal ArticleDOI
Calcium and zinc in the endometrium and uterine flushings of the roe deer (Capreolus capreolus) during delayed implantation.
TL;DR: The concentration of zinc in the endometrium of the roe deer was maintained at a constantly high level throughout delayed implantation and at the time of rapid embryonic growth, reaching maximal levels upon the resumption of rapid embryos growth.