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• W2020833437 abstract "Human pancreatic cells of the Capan-1 cell line differentiate in culture. During the exponential growth phase, the cells are undifferentiated, only becoming differentiated during the stationary phase. The formation of domes in this phase is related to the exchange of water and electrolytes. The present study was designed to characterize the localization and expression of alkaline phosphatases (AP) in Capan-1 cells during growth in culture. Biochemical, cytoenzymatic and immunocytochemical methods were employed combined with light and electron microscopic examination. AP essentially of the placental type were expressed progressively during the exponential growth phase, and were seen to be distributed over the surface of the Capan-1 cells. In the stationary phase, the AP became localized on the surface of microvilli. The precipitates of the enzyme reaction highlighted regular four-bodied structures. Biochemical assays showed a progressive increase in activity of this enzyme in cells during both the exponential and stationary growth phases. However, in the stationary phase between days 7 and 8, there was a fall in enzyme activity, with a corresponding increase in this activity in the culture medium. Cytological examination indicated that this fall could be accounted for by loss of AP-positive membranes by vesiculization of apical microvilli and release of microvesicles into the culture medium. Immunoblots showed that Capan-1 cells expressed two types of AP, a placental type (70 kDa) and to a lesser extent a liver type (80 kDa). Expression of the placental type was attributed to a neoplastic derepression of the coding gene, while the liver type was assumed to be a normal gene expression of human duct cells. The placental type AP might thus serve as a marker of transformation, and the liver type as a marker of differentiation." @default.
• W2020833437 created "2016-06-24" @default.
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• W2020833437 date "1991-01-01" @default.
• W2020833437 modified "2023-10-18" @default.
• W2020833437 title "Expression and characterization of alkaline phosphatases during differentiation of human pancreatic cancer (Capan-1) cells in culture" @default.
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• W2020833437 doi "https://doi.org/10.1016/0248-4900(91)90004-7" @default.
• W2020833437 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1819361" @default.
• W2020833437 hasPublicationYear "1991" @default.
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