Browsing by Subject "Transitional epithelium"

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    Alkaline phosphatase, 5'-nucleotidase and magnesium-dependent adenosine triphosphatase activities in the transitional epithelium of the rat urinary bladder
    (Murcia : F. Hernández, 1991) Zhang, S.X.; Kobayahsi, T.; Okada, T.; García del Saz, E.; Seguchi, H.
    The cerium-based method was used to demonstrate cytochemically the ultrastructural localization of alkaline phosphatase (ALPase), 5'- nucleotidase (5'-Nase) and magnesium-dependent adenosine triphosphatase (Mg-ATPase) on the transitional epithelium of the rat urinary bladder. The reaction product for ALPase was found on the plasma membrane of al1 epithelial cells, except the luminal surface of superficial cells. The activity of 5'-Nase appeared on the plasma membrane of al1 bladder transitional epithelial cells, including the free surface of superficial cells. The Mg-ATPase reaction product was seen on the plasma membrane of superficial, intermediate and basal cells, but never on the luminal surface of superficial cells and it was only occasionally seen on the basal surface. The possible functions of these phosphatases have been discussed, and it was emphasized that the 5'-Nase activity present on the luminal surface of superficial cells may play a special role in the membrane movement of these cells in the transitional epithelium.
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    The fate of the luminal asymmetric unit membrane of the superficial cell of the rat transitional epithelium
    (Murcia: F. Hernández, 1994) Zhang, S.X.; Seguchi, H.
    The fate of the luminal asymmetric unit membrane (AUM) of the superficial cell of the transitional epithelium of the rat urinary bladder was electron microscopically and cytochemically investigated using exogenously administered horseradish peroxidase (HRP) as tracer. HRP-positive discoidal vesicles were formed by the folding of the AUM of the luminal surface plasma membrane. With the passage of time, these vesicles changed their shapes and were finally transformed into lysosomes by the following possible routes: 1) by becoming multivesicular bodies (MVBs); 2) by directly fusing with lysosomes; and 3) by becoming autophagic vacuoles. Another possibility would be reutilization.