Alkaline phosphatase distribution in the plasma membrane of uterine epithelial cells is markedly altered during early pregnancy in the rat

1995 ◽  
Vol 19 (11) ◽  
pp. 921-928 ◽  
Author(s):  
M Bucci
Keyword(s):  
Alkaline Phosphatase ◽  
Plasma Membrane ◽  
Epithelial Cells ◽  
Early Pregnancy ◽  
Uterine Epithelial Cells

310. CAVEOLIN 1 AND 2 IN THE UTERUS DURING EARLY PREGNANCY

2010 ◽  
Vol 22 (9) ◽  
pp. 110
Author(s):  
R. J. Madawala ◽  
C. R. Murphy
Keyword(s):  
Plasma Membrane ◽  
Epithelial Cells ◽  
Protein Expression ◽  
Early Pregnancy ◽  
Basolateral Membrane ◽  
Membrane Curvature ◽  
Major Protein ◽  
Uterine Epithelial Cells ◽  
Caveolin 1 ◽  
Blastocyst Implantation

Rat uterine epithelial cells undergo many changes during early pregnancy in order to become receptive to blastocyst implantation. These changes include basolateral folding and the presence of vesicles of various sizes which are at their greatest number during the pre-implantation period. The present study investigated the possible role that caveolin 1 and 2 plays in this remodelling specifically days 1, 3, 6, 7, and 9 of pregnancy. Caveolin is a major protein in omega shaped invaginations of the plasma membrane called caveolae that are considered to be specialised plasma membrane subdomains. Caveolae are rich in cholesterol, glycosphingolipids, and GPI anchored proteins and are involved in endocytosis and membrane curvature. Immunofluorescence microscopy has shown caveolin 1 and 2 on day 1 of pregnancy are localised to the cytoplasm of luminal uterine epithelial cells, and by day 6 of pregnancy (the time of implantation), it concentrates basally. By day 9 of pregnancy, expression of both caveolin 1 and 2 in luminal uterine epithelia is cytoplasmic as seen on day 1 of pregnancy. A corresponding increase in protein expression of caveolin 1 on day 6 of pregnancy in luminal uterine epithelia was observed. Interestingly however, caveolin 2 protein expression decreases at the time of implantation as found by western blot analysis. Both caveolin 1 and 2 were localised to blood vessels within the endometrium and myometrium and also the muscle of the myometrium in all days of pregnancy studied. In addition, both caveolin 1 and 2 were absent from glandular epithelium, which is interesting considering that they do not undergo the plasma membrane transformation. The localisation and expression of caveolin 1 and 2 in rat luminal uterine epithelium at the time of implantation suggest possible roles in trafficking of cholesterol and/or various proteins for either degradation or relocation. Caveolins may contribute to the morphology of the basolateral membrane seen on day 6 of pregnancy. All of which may play an important role during successful blastocyst implantation.

scholarly journals Uterine Epithelial Cells Undergo a Plasma Membrane Transformation During Early Pregnancy in the Domestic Cat (Felis catus )

2018 ◽  
Vol 301 (9) ◽  
pp. 1497-1505 ◽  
Author(s):  
Jessica S. Dudley ◽  
Christopher R. Murphy ◽  
Michael B. Thompson ◽  
Tanya Carter ◽  
Bronwyn M. McAllan
Keyword(s):  
Plasma Membrane ◽  
Epithelial Cells ◽  
Early Pregnancy ◽  
Felis Catus ◽  
Domestic Cat ◽  
Uterine Epithelial Cells ◽  
Membrane Transformation

312. THE DISTRIBUTION OF PROMININ-1 IN THE RAT UTERUS DURING EARLY PREGNANCY

2010 ◽  
Vol 22 (9) ◽  
pp. 112
Author(s):  
S. N. Dowland ◽  
L. A. Lindsay ◽  
C. R. Murphy
Keyword(s):  
Plasma Membrane ◽  
Epithelial Cells ◽  
Early Pregnancy ◽  
Cell Types ◽  
Apical Plasma Membrane ◽  
Apical Surface ◽  
Uterine Epithelial Cells ◽  
Uterine Epithelial Cell ◽  
Terminal Web ◽  
Blastocyst Implantation

Prominin-1 is a recently discovered pentaspan membrane protein present in characteristic cholesterol-based vesicles and associated with microvilli. These vesicles are used to deliver prominin-1 to the apical plasma membrane in a number of cell types. Previous work on uterine epithelial cells has demonstrated a loss of microvilli and the presence of large, cholesterol-based vesicles at the time of implantation. Thus this study aims to determine a role for prominin-1 in rat uterine epithelial cells during early pregnancy. Immunofluorescence microscopy reveals punctate and diffuse prominin-1 staining below the apical plasma membrane on day 1 of pregnancy. At the time of blastocyst implantation (day 6) however, prominin-1 appears concentrated at the apical surface of the cell. Western blotting of isolated uterine epithelial cell lysate revealed a change in prominin-1 glycosylation during early pregnancy. Prominin-1 was determined to be glycosylated on day 1 of pregnancy, but these carbohydrate side chains were lost by the time of attachment. Results seen in the present study indicate that prominin-containing vesicles may be prevented from reaching the apical plasma membrane by the terminal web on day 1 of pregnancy. On day 6, the loss of the terminal web may allow the vesicles to approach and incorporate into the apical plasma membrane, as seen with other uterine vesicles. The deglycosylation of prominin-1 at this time is suggested to allow the protein to bind its ligand and activate downstream signalling pathways that permit implantation. This study constitutes the first reported observation of prominin in endometrial lumenal epithelial cells. These preliminary results, in consideration with previous reports of prominin expression in trophoblast cells, suggest an important role for this protein in early pregnancy.

THE PLASMA MEMBRANE TRANSFORMATION: A KEY CONCEPT IN UTERINE RECEPTIVITY

2001 ◽  
Vol 9 (3) ◽  
pp. 197-208 ◽  
Author(s):  
CR Murphy
Keyword(s):  
Plasma Membrane ◽  
Epithelial Cells ◽  
Early Pregnancy ◽  
Fetal Tissue ◽  
Human Beings ◽  
Human Uterus ◽  
Uterine Receptivity ◽  
Uterine Epithelial Cells ◽  
Considerable Body ◽  
Membrane Transformation

The first site of contact between maternal and fetal tissue at the beginning of blastocyst attachment and implantation is the plasma membrane of uterine epithelial cells. Indeed, as has been noted often, regardless of the mode of placentation which ultimately occurs, contact between this plasma membrane and that of the trophoblast is a common beginning to implantation in most species studied so far, which now range from viviparous lizards to human beings. The similarities in these early events of uterine receptivity and placentation go further than mere contact between opposing surfaces however. A considerable body of evidence indicates that the behaviour of the plasma membrane of uterine epithelial cells during early pregnancy has many common aspects across species including humans. This review pays special attention to events in the human uterus and the epithelial cells in particular, but examines them within the wider context of uterine receptivity for implantation across species.

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