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Alkaline phosphatase activity in human bladder tumor cell lines


Alkaline phosphatase activity in human bladder tumor cell lines



Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society 25(4): 266-274



ISSN/ISBN: 0022-1554

PMID: 870558

DOI: 10.1177/25.4.870558

The cellular localization and isoenzyme pattern of alkaline phosphatase in five cell lines derived from human bladder carcinomas (T24, RT4, RT112, J82, EJ) shown not to be HeLa cells has been established. RT112 cells had a high level of alkaline phosphatase. RT4 had a moderate amount of alkaline phosphatase but in the other three lines, levels were extremely low. Prednisolone caused a small (2 to 3-fold) increase in total alkaline phosphatase in T24 and RT112 lines only. Electrophoretic separation of isoenzymes showed that RT112 and RT4 cells (derived from more highly differentiated tumor types) had three heat stable bands equivalent to placental alkaline phosphatase and three slower bands of a modified placental type. Prednisolone increased only the former. In T24 cells the enzyme resembled the liver-type alkaline phosphatase in electrophoretic mobility and sensitivity to heat denaturation. Cytochemical studies confirmed the presence of cell surface-associated extramembraneous placental type enzyme in RT112 cells. All five cell lines had small deposits of intramembraneous alkaline phosphatase in the plasma membrane and deposits associated tith the mitochondrial membranes and the endoplasmic reticulum that were not completely inhibited by phenylalanine or Levamisole.

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Accession: 004696540

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