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Equine chorionic gonadotropin (eCG) production by the fetally derived endometrial cups appears to be necessary for the establishment and maintenance of normal equine pregnancy.Starting at about the 27th day of pregnancy, an equatorial band of trophectodermal cells on the surface of the spherical conceptus forms the chorionic girdle. This girdle consists initially of flat trophectodermal epithelium...
The placenta is the only channel for transport of nutrients to the conceptus and the fetal nutrient demands increase exponentially to term. The 9kDa calcium binding protein (calbindin, 9CBP) and the iron binding protein uteroferrin (UF) are proving to be reliable markers for epithelia that mediate active transcellular calcium and iron transport and the glucose transporter proteins (GT1 and GT3) for...
Intraepithelial lymphocytes are a constant feature of ruminant uterine epithelium. Light microscope quantitation on semithin sections of resin embedded perfused material from pregnant and non-pregnant cows shows that although the proportion of large granular lymphocytes to non-granular lymphocytes in interplacentomal areas increases during pregnancy, the total number of lymphocytes in these areas...
An in vitro technique for the measurement of calcium uptake into the maternal-facing fetal chorionic membrane (apical trophoblast) was used to study the relationship between calcium uptake and stage of pregnancy in the sheep. The effects on calcium uptake of varying calcium concentration and temperature of the incubation medium, of adding calcium channel blockers or heavy metals (lanthanum and nickel)...
The calcium requirement of the ovine fetus increases progressively throughout pregnancy. The 9-kDa calcium binding protein (calbindin-D 9k ; 9CBP) is considered to be a reliable marker for epithelia mediating calcium transport. This quantitative in situ hybridization study shows that the levels of 9CBP mRNA show a pregnancy stage-related increase which correlates with fetal calcium demand...
Trophoblas binucleate cells (BNC) in the ruminant placenta demonstrate a characteristic development, mature structure and migratory capacity whether situated in cytoledonary or intercotyledonary rerions of the placenta. However, previous immunocytochemical studies demonstrated clear differences in gene expression in granule contents of BNC according to their anatomical location with some proteins...
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